CN108411321A - A kind of electrolyzer with dual membranes and three chambers prepares the apparatus and method of ferrate - Google Patents
A kind of electrolyzer with dual membranes and three chambers prepares the apparatus and method of ferrate Download PDFInfo
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
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Abstract
The present invention discloses the device that a kind of electrolyzer with dual membranes and three chambers prepares ferrate, and device includes：The cation-exchange membrane and anion-exchange membrane of electrolytic cell and electrolyte bath；Electrolytic cell is separated into three electrode chambers by cation-exchange membrane and anion-exchange membrane, and three electrode chambers are followed successively by graphite electrode room, wire netting electrode chamber and iron plate electrode chamber；Graphite electrode, wire netting electrode and iron plate electrode are respectively equipped in three electrode chambers；Wherein cation-exchange membrane is between graphite electrode and wire netting electrode, and anion-exchange membrane is between wire netting electrode and iron plate electrode；Graphite electrode room, wire netting electrode chamber and iron plate electrode chamber are connect by conducting wire with timing reversing device respectively, and timing reversing device links together with DC power supply.By the present invention in that with periodical communicating DC power supply, the problem of current efficiency caused by anodic passivity occurred during ferrate declines energy consumption increase can be prepared to avoid electrochemical process, improves current efficiency.
Description
Technical field
The invention belongs to electrochemical technology field, more particularly to a kind of electrolyzer with dual membranes and three chambers prepares ferrate
Apparatus and method.
Background technology
Ferrate is commonly referred to as the oxysalt containing+6 valence state iron, is a kind of selective novel, efficient, more
The Green Oxidant of function.Ferrate has strong oxidizing property and selectivity, can be selectively oxidized to many organic matters,
The reduzate generated after reaction is safe and nontoxic, pollution-free, and ferrate itself is environmental-friendly, will not be caused to environment
Secondary pollution is effectively applied to the oxidative synthesis of organic matter；The oxidation of ferrate collection, absorption, flocculation, disinfection and sterilization
Multiple action, and sterilizes and is significantly stronger than chlorine type oxidant with bactericidal effect, applies to water process with can having；Except this
Except, ferrate is also used as the positive electrode of battery, and the chemical property of high ferro cell is very superior, electrode potential
It is all higher than conventional batteries with theoretical capacity, and there is more stable discharge platform, it is often more important that, high ferro cell and its useless
Gurry not can cause environmental pollution.In conclusion ferrate is in organic synthesis technology, cell positive material and water process side
The application in face has prodigious potentiality, is more and more paid attention to by people in recent years.Water process neck especially in environmental protection
Domain, it has been recognized that ferrate is a kind of a kind of New Type Water Treatment Chemicals after chlorine, hypochlorite, ozone, high ferro
Acid ion has strong oxidizing property, and especially in acid condition, oxidation-reduction potential is also higher than ozone, also above other biographies
System water treatment agent is a kind of multi-functional, nontoxic, efficient water treatment agent, water process is more suitably applied to than traditional water treatment agent,
It has the advantages that many incomparable：1, reduzate is Fe (OH)3, it is nontoxic, secondary pollution will not be caused to environment；
2, have the function of oxidation, absorption, flocculation and sterilizing etc.；3, all there is good effect in entire pH value range；4, it grasps
Work is convenient, oxidation rate is fast, sterilizing power is strong.
Ferrate can make organic pollution more effectively by oxidation removal.Ferrate can also be aoxidized effectively
The inorganic pollutions such as hydrogen sulfide, ammonia, cyanide in water removal；For ferrate as water treatment agent, it also has sterilizing effect；
For ferrate during oxidation removal water pollutant and microorganism, reduction generates Fe (OH)3Equal ferric iron compounds, and
The Fe (OH) of generation3Equal ferric iron compounds not only effect harmless to the human body, and there is flocculation, it can effectively wad a quilt with cotton
It coagulates, be adsorbed and removed harmful substance and cell suspension in water, especially those nano level suspended particulate substances；Ferrate passes through
Flocculation can also remove some metal ions in water removal, moreover it is possible to for going the radioactive element in water removal, PottS et al. to use
Ferrate handles the waste water containing Am and Pu, it is found that the initial activity of radioactive element is substantially reduced.
Currently, there are mainly three types of the preparation processes of ferrate：Chemical wet oxidation, electrochemical oxidation process and heat chemistry oxygen
Change method.
Chemical wet oxidation generally refers to hypohalite oxidizing process, the preparation process need to control at a lower temperature into
Row, operation sequence are very complicated；The content of hypochlorite is too low (only 20% or so) in hypochlorite solutions used, and easily
It decomposes；Along with Fe (OH) in reaction process3Generation, generated ferrate can be catalytically decomposed, therefore in hypochlorite
A large amount of raw material can be consumed in oxidizing process preparation process, and the yield of ferrate is relatively low；Due to hypochlorite oxidation method
It can be used with toxicity and corrosive chlorine in whole preparation process, therefore the air-tightness and rotproofness of consersion unit are wanted
Ask relatively high, and the by-product generated in reaction process also would seriously pollute the environment, these disadvantages make hypochlorite oxidation
Method is difficult to scale up production.
During preparing ferrate with electrochemical oxidation process, anode surface can slowly form one layer of passivating film, to
Further electrolysis is prevented, with the extension of time, the current efficiency of electrosynthesis glyoxal ferrate continuously decreases, so as to cause total
Current efficiency also reduces；The method power consumption is higher, is also possible to generate by-product if controlling bad reaction condition, especially because
The anode surface passivation phenomenon easily occurred when using iron pole plate, causes electrolytic efficiency relatively low, product purity is relatively low；In addition, generating
Complicated purification process after ferrate requires apparatus and process conditions also very high.Therefore, current electrolysis technique
The needs of industrialized production ferrate can not be met；In addition, influencing the factor of electrolytic preparation ferrate current efficiency also
Have：Concentration, the temperature of electrolyte, anode apparent current density of the used alkali of electrolyte etc..
When heat chemistry oxidizing process prepares ferrate, a large amount of heat can be released during the reaction, have and explode
Danger need to strictly control operating condition, so fewer about the report of this preparation method at present.
In conclusion in three kinds prepare the method for ferrate, DC electrolysis the preparation method due to having many advantages, such as more
With development potentiality, and an outstanding problem is exactly because anode plate passivation causes electric current to be imitated during this method prepares ferrate
Rate declines energy consumption and increases, and limits the extensive use of this method.
Invention content
For the above problem existing for existing ferrate technology of preparing, the present invention provides a kind of electrolyzer with dual membranes and three chambers
The apparatus and method for preparing ferrate are blunt solving anode using commutation power supply with three Room, three electrolysis device of double diaphragms
While change problem, original anode is made to become cathode when passing through the current of commutation, remaining metal iron anode is started to work, and foot is provided
Enough iron ions, whole device uninterruptedly produce, and improve the preparation efficiency of ferrate.
The technical solution adopted by the present invention is：
A kind of electrolyzer with dual membranes and three chambers prepares the device of ferrate, and device includes：The sun of electrolytic cell and electrolyte bath
Amberplex and anion-exchange membrane；
Electrolytic cell is separated into three electrode chambers by cation-exchange membrane and anion-exchange membrane, and three electrode chambers are followed successively by stone
Electrode ink room, wire netting electrode chamber and iron plate electrode chamber；Graphite electrode, wire netting electrode and iron are respectively equipped in three electrode chambers
Plate electrode；For wherein cation-exchange membrane between graphite electrode and wire netting electrode, anion-exchange membrane is located at wire netting electricity
Between pole and iron plate electrode；Graphite electrode room, wire netting electrode chamber and iron plate electrode chamber are filled by conducting wire and timing reversing respectively
Connection is set, timing reversing device links together with DC power supply.
The side wall of electrolytic cell is equipped with chuck, and electrolyte bath is equipped with temperature sensor.
Wire netting electrode chamber is internally provided with agitating device.
Timing reversing device includes timing electromagnetic relay, common three circuit electromagnetics relay, connecting wire, control electricity
Road can be set as needed commutating period and the starting electrode of periodic reverse, and can be with electric current in regulating loop and voltage
Size takes constant current or constant voltage mode to provide power supply to reaction unit.
A kind of method that electrolyzer with dual membranes and three chambers prepares ferrate,
Using above-mentioned apparatus, carry out according to the following steps：
1), the NaOH solution of a concentration of 15-35mol/L is placed in electrolytic cell, by graphite electrode, wire netting electrode and iron
Plate electrode is immersed in NaOH solution；
2) it, is powered respectively to graphite electrode, wire netting electrode and iron plate electrode by DC power supply；In operational process first
Circuit is formed by graphite electrode and wire netting electrode, wire netting electrode passes through as cathode after energization as anode, graphite electrode
Electrolysis carries out electrolytic preparation under the conditions of 25 DEG C of electrolysis temperature, decomposition voltage 4-12V, electrolysis time are 60-420min
Na2Fe04, the wherein indoor mixing speed of wire netting electrode are 750rad/min；The temperature of NaOH solution is logical in electrolytic cell
It crosses and is passed through hot water realization in the chuck on cell sidewall；
3) ferrate of dissolving, is obtained in wire netting electrode chamber, that is, anode chamber；After electrolysis, obtained in anode chamber molten
Solution property Na2Fe04, concentration is in 0.10-0.15mol/L；After continuously adding saturation NaOH solution into anode chamber's solution, part is high
Ferrous acid sodium crystal starts to be precipitated, and dries crystal to get to Na2Fe04 solid particle by filtered；
4), in electrolytic process, electrode pair is formed by graphite electrode and wire netting electrode first, realizes electrochemical process ferric acid
The preparation of salt, during this, wire netting electrode is anode, and graphite electrode is cathode；In electrolytic process, anode chamber can consume largely
OH-, and Na2Fe04 is generated in anode chamber, while passivating film can be increasingly generated in wire netting electrode surface；By condition reality
It issues after examination and approval now, when being electrolysed 30-40min, Faradaic current is decreased obviously, and is observed by Electronic Speculum and is found that wire netting electrode surface is begun with
Passivating film generates, until when electrolysis time extends to 55-65min, Faradaic current, which drops to, to be close to zero；In order to avoid anodic passivity
Wire netting electrode current direction is adjusted, is made when electrolysis time is about 30min by the generation for influencing ferrate
For electrolysis cathode, while using iron plate electrode as anode, the elimination work of film is passivated to wire netting electrode using reverse current
Make, so that it restores original electro-chemical activity；At this point, iron plate electrode has also begun to ferric acid as anode in NaOH solution
Sodium generates, while the OH in iron plate electrode chamber-, wire netting electrode chamber can be entered by anion-exchange membrane under electric field action,
To the OH consumed-It is supplemented；After reversed energization 10-20min, the passivating film of wire netting electrode surface quilt completely at this time
It eliminates, the OH in solution-Ion is also supplemented, and changes electrode current direction, the still conduct of wire netting electrode again at this time
Anode, graphite electrode produce Na2Fe04 as cathode, continuation in wire netting electrode chamber；After waiting for entire production process,
There is Na2Fe04 generation in iron plate electrode chamber and in wire netting electrode chamber, the difference is that its product quantity is different, i.e., two
Na2Fe04 solution concentration is different in electrode chamber；Saturation NaOH solution is added into two electrode chambers respectively, has Na2Fe04
Crystal is precipitated, and is dried after filtering and can be prepared by Na2Fe04 solid particle.
Passive metal in electrolytic process can be made by periodically-varied power positive cathode using communicating DC power supply
The passivating film of anode surface disappears, and activity recovery solves ferrate to deactivated metal anode using commutation power supply again
Lead to the increased main problem-anode plate problem of passivation of energy consumption in electrolysis preparation process, to improve efficiency；Utilize three
The double three electrolysis devices of diaphragm in room, while solving the problems, such as anodic passivity using commutation power supply, using the double diaphragms in three Room with
Double anode designs, and original anode becomes cathode when passing through the current of commutation, remaining metal iron anode is started to work, and realizes entire electricity
Solution preocess has iron anode to be electrolysed, and provides enough iron ions, and continuing commutation after original anodic passivity film is eliminated makes it
Again continue to provide iron ion as anode, whole device uninterruptedly produces, and improves efficiency, the high ferro generated using the device
The various organic wastewaters of hydrochlorate processing.
The device of the invention and method have the following advantages：
1, commutation power supply and three the Room three electrolysis device of double diaphragms that the present invention designs are led to using activation of cathode theory
Cross service life communicating DC power supply, can be prepared to avoid electrochemical process occur during ferrate because anodic passivity is led
The current efficiency of cause declines the problem of energy consumption increases, and improves current efficiency.
2, apparatus of the present invention are because using the double diaphragm three-electrode structures in three Room, by adjusting current direction, using between three Room
Two amberplexes, so that double iron anodes is uninterruptedly electrolysed for the first time, i.e., original anode be passivated by the power supply that commutates and disappeared
While except work, another iron anode can also be utilized to work, improve efficiency；When iron plate electrode chamber can be utilized to work simultaneously
OH-Ion can migrate under electric field action to wire netting electrode chamber, to supplement the OH consumed-, it is ensured that the effect of main production process
Rate.
3, the present invention is because the device is using three Room, three electrode assembly, wherein passing through periodically-varied current direction and work
Make anode electrode, can to avoid near the cathode chamber easily occurred in previous dual chamber electrolytic process because have a large amount of hydrogen generate can not and
When overflow and occur bath resistance increase loop current reduce increase energy consumption the problem of, can also avoid single anode assembly because
The problem of excessively high inhibition electrolysis of iron concentration nearby of anode caused by continuous electrolysis further carries out and increases energy consumption, it is many-sided
Reduce energy consumption.
Description of the drawings
Fig. 1 prepares the device cross-sectional view of ferrate for the electrolyzer with dual membranes and three chambers in the embodiment of the present invention 1；
Fig. 2 is periodic reverse schematic diagram of device of the present invention；
Fig. 3 is the commutation cycle of the embodiment of the present invention to Na2FeO4The influence curve figure of production；
Fig. 4 is wire netting of embodiment of the present invention anode chamber Na2FeO4Concentration changes with time situation curve graph；
Fig. 5 is reaction temperature of the embodiment of the present invention to Na2FeO4The influence curve figure to tell on.
Specific implementation mode
The present invention is further described for 1-5 and embodiment with reference to the accompanying drawings of the specification；It is used in the embodiment of the present invention
Anions and canons exchange membrane is the amberplex of PBI powder self manufacture purchased in market, and phosphoric acid is respectively adopted and sodium hydroxide changes it
Property, so that it is respectively provided with anions and canons function of exchange.
A kind of electrolyzer with dual membranes and three chambers prepares the device of ferrate, and device includes：The sun of electrolytic cell 1 and electrolyte bath
Amberplex 2 and anion-exchange membrane 3；
Electrolytic cell is separated into three electrode chambers by cation-exchange membrane and anion-exchange membrane, is filled in three electrode chambers
NaOH solution 11, three electrode chambers are followed successively by graphite electrode room, wire netting electrode chamber and iron plate electrode chamber；Divide in three electrode chambers
It She You not graphite electrode 4, wire netting electrode 5 and iron plate electrode 6；Wherein cation-exchange membrane 4 is located at graphite electrode 4 and wire netting
Between electrode 5, anion-exchange membrane 3 is between wire netting electrode 5 and iron plate electrode 6；Graphite electrode room, wire netting electrode chamber
It is connect respectively with timing reversing device 9 by conducting wire with iron plate electrode chamber, timing reversing device 9 is connected to one with DC power supply 10
It rises.
The side wall of electrolytic cell is equipped with chuck 7, and electrolyte bath is equipped with temperature sensor.
Wire netting electrode chamber is internally provided with agitating device 8, and agitating device uses driven stirring rod.
Timing reversing device includes timing electromagnetic relay, common three circuit electromagnetics relay, connecting wire, control electricity
Road can be set as needed commutating period and the starting electrode of periodic reverse, and can be with electric current in regulating loop and voltage
Size takes constant current or constant voltage mode to provide power supply to reaction unit.
Control circuit uses double-point double-throw switch, and when double-point double-throw switch is on top, the both ends A, B are connected, and B is sun at this time
Pole connects wire netting electrode；The ends A are cathode, connect graphite electrode；Two, left side room forms work dual chamber, where wire netting electrode
Medial compartment in generate ferrate, until wire netting electrode occur passivation reaction close to stop when, propose generate ferric acid
B is connected to by sodium at this time by switch conversion to lower end with C-terminal, and B becomes cathode at this time, and the iron plate electrode of C-terminal becomes anode, right side
Room begins with Na2Fe04 generation, while the metal passivating film on wire netting electrode starts to dissolve, and energization ability is restored；It waits for
After energization a cycle, switch is automatic to be converted into top connection again, is repeated with this.Switch automatic conversion process therein is by timing
Relay sets and controls.
Material selection grey iron, cast iron or the spoken parts in traditional operas of the wire netting electrode and iron plate electrode that are used in the embodiment of the present invention
Iron.
The timing reversing device used in the embodiment of the present invention passes through clock relay, electromagnetic relay, timing for self-control
The compositions such as device, after being connect with D.C. regulated power supply as can according to require setting different time after current direction generating period
Change, powers for reaction unit.
The Na2Fe04 prepared is because being dissolved in NaOH solution, when measuring its concentration, according to ferrate at 505nm
Characteristic with characteristic absorption peak is measured using ultraviolet-visible spectrophotometer using direct spectrophotometry, for that will make
Standby obtained Na2Fe04 is applied to water treatment procedure, can directly take out anode chamber's solution, test its Na2Fe04 concentration, and
According to processing requirement, Na2Fe04 solution is directly added into waste water and the parameters such as additive amount, pH value are changed according to treatment effect,
To obtain optimization process effect；Also Na2Fe04 particle can be made to be precipitated by the way that enough NaOH are added into anode chamber, the height of precipitation
Sodium ferrite solid particle is dried after filtering, its crystal structure can be tested by means such as X-ray diffractions to determine its product kind
Class and purity.
Embodiment 1
It takes the NaOH solution of a concentration of 20mol/L of 250mL to be placed in three tank houses, controls electrolysis temperature room temperature, be 25
DEG C or so, impressed current intensity is 2A, and the different commutation cycles are respectively adopted, and tests in wire netting electrode chamber and iron plate electrode chamber and obtains
The Na obtained2FeO4Concentration levels investigate the commutation cycle to Na2FeO4The influence of production, as shown in Figure 3.
Embodiment 2
250mL various concentrations NaOH solution is taken to be placed in three tank houses as electrolyte, control electrolyte temperature is 35
DEG C, impressed current is electrolysed under the conditions of being 2A, commutation cycle 10min, the Na prepared under the conditions of various concentration2FeO4Concentration such as Fig. 4
It is shown, there it can be seen that when electrolysis time be 4h when, and NaOH concentration be 18mol/L when, wire netting anode chamber obtain
Na2FeO4Concentration is maximum, is 88.7mmolL-1Left and right.The Na that iron plate electrode chamber obtains at this time2FeO4A concentration of 53.4mmol
L-1。
Embodiment 3
250mL18mol/LNaOH solution is taken to be placed in wire netting and iron plate anode chamber as electrolyte, by reactive tank
It is passed through different temperatures hot water in interlayer to react at different temperatures to control electrolyte, impressed current 2A, the commutation cycle is
10min, Na in wire netting anode chamber2FeO4；Concentration is as shown in Figure 2 with change curve of the temperature under different time.It can from Fig. 5
To find out, as the reaction time increases, when temperature is 15 DEG C and 25 DEG C, Na2FeO4；Concentration gradually increases, wherein at 25 DEG C
Na2FeO4；Concentration reaches maximum when the reaction time is 5h, starts to continuously decrease later,；When temperature is 35 DEG C, Na2FeO4；
Concentration first increases and declines afterwards, and with the raising of temperature, Na2FeO4；It is shorter that concentration reaches the time needed for maximum value.It can from Fig. 5
To find out, Na is synthesized using this method2FeO4；Convenient temperature range is 35 DEG C or so, and wire netting anode chamber obtains when reacting 4h
The Na obtained2FeO4Concentration is maximum, is 88.7mmolL-1It controls, at this time Na in iron plate anode chamber2FeO4；Concentration is about
53.4mmol/L。
Claims (6)
1. a kind of electrolyzer with dual membranes and three chambers prepares the device of ferrate, which is characterized in that
Device includes：The cation-exchange membrane and anion-exchange membrane of electrolytic cell and electrolyte bath；
Electrolytic cell is separated into three electrode chambers by cation-exchange membrane and anion-exchange membrane, and three electrode chambers are followed successively by graphite electricity
Pole room, wire netting electrode chamber and iron plate electrode chamber；Graphite electrode, wire netting electrode and iron plate electricity are respectively equipped in three electrode chambers
Pole；Wherein cation-exchange membrane between graphite electrode and wire netting electrode, anion-exchange membrane be located at wire netting electrode and
Between iron plate electrode；Graphite electrode room, wire netting electrode chamber and iron plate electrode chamber are connected by conducting wire and timing reversing device respectively
It connects, timing reversing device links together with DC power supply.
2. a kind of electrolyzer with dual membranes and three chambers according to claim 1 prepares the device of ferrate, which is characterized in that
The side wall of electrolytic cell is equipped with chuck, and electrolyte bath is equipped with temperature sensor.
3. a kind of electrolyzer with dual membranes and three chambers according to claim 1 prepares the device of ferrate, which is characterized in that
Wire netting electrode chamber is internally provided with agitating device.
4. a kind of electrolyzer with dual membranes and three chambers according to claim 1 prepares the device of ferrate, which is characterized in that
Timing reversing device includes timing electromagnetic relay, common three circuit electromagnetics relay, connecting wire, control circuit, can
To be set as needed commutating period and the starting electrode of periodic reverse, and can with electric current in regulating loop and voltage swing,
Constant current or constant voltage mode is taken to provide power supply to reaction unit.
5. a kind of method that electrolyzer with dual membranes and three chambers prepares ferrate, which is characterized in that
Using above-mentioned apparatus, carry out according to the following steps：
1), the NaOH solution of a concentration of 15-35mol/L is placed in electrolytic cell, by graphite electrode, wire netting electrode and iron plate electricity
Pole is immersed in NaOH solution；
2) it, is powered respectively to graphite electrode, wire netting electrode and iron plate electrode by DC power supply；First by stone in operational process
Electrode ink and wire netting electrode form circuit, and wire netting electrode passes through electrolysis as anode, graphite electrode as cathode after energization
Effect carries out electrolytic preparation high ferro under the conditions of 25 DEG C of electrolysis temperature, decomposition voltage 4-12V, electrolysis time are 60-420min
Sour sodium, the wherein indoor mixing speed of wire netting electrode are 750rad/min；In electrolytic cell the temperature of NaOH solution be pass through to
Hot water realization is passed through in chuck on cell sidewall；
3) ferrate of dissolving, is obtained in wire netting electrode chamber, that is, anode chamber；After electrolysis, dissolubility is obtained in anode chamber
Na2Fe04, concentration is in 0.10-0.15mol/L；After continuously adding saturation NaOH solution into anode chamber's solution, part ferric acid
Sodium crystal starts to be precipitated, and dries crystal to get to Na2Fe04 solid particle by filtered；
4), in electrolytic process, electrode pair is formed by graphite electrode and wire netting electrode first, realizes electrochemical process ferrate
It prepares, during this, wire netting electrode is anode, and graphite electrode is cathode；In electrolytic process, anode chamber can consume largely
OH-, and Na2Fe04 is generated in anode chamber, while passivating film can be increasingly generated in wire netting electrode surface；By condition experiment
It was found that when being electrolysed 30-40min, Faradaic current is decreased obviously, and it is blunt to find that wire netting electrode surface is begun with by Electronic Speculum observation
Change film to generate, until when electrolysis time extends to 55-65min, Faradaic current, which drops to, to be close to zero；In order to avoid anodic passivity shadow
Wire netting electrode current direction is adjusted by the generation for ringing ferrate when electrolysis time is about 30min, as
Electrolysis cathode, while using iron plate electrode as anode, the elimination work of film is passivated to wire netting electrode using reverse current,
So that it restores original electro-chemical activity；At this point, iron plate electrode as anode, has also begun to Na2Fe04 life in NaOH solution
At, while the OH in iron plate electrode chamber-, wire netting electrode chamber can be entered by anion-exchange membrane under electric field action, offseted
The OH consumed-It is supplemented；After reversed energization 10-20min, the passivating film of wire netting electrode surface is eliminated completely at this time
Fall, the OH in solution-Ion is also supplemented, and changes electrode current direction again at this time, and wire netting electrode is still used as anode,
Graphite electrode produces Na2Fe04 as cathode, continuation in wire netting electrode chamber；After waiting for entire production process, iron plate electricity
There is Na2Fe04 generation in pole room and in wire netting electrode chamber, the difference is that its product quantity is different, i.e. two electrode chambers
Interior Na2Fe04 solution concentration is different；Saturation NaOH solution is added into two electrode chambers respectively, has the analysis of Na2Fe04 crystal
Go out, is dried after filtering and can be prepared by Na2Fe04 solid particle.
6. a kind of method that electrolyzer with dual membranes and three chambers prepares ferrate, which is characterized in that
Passive metal anode in electrolytic process can be made by periodically-varied power positive cathode using communicating DC power supply
The passivating film on surface disappears, and activity recovery solves ferrate electrolysis to deactivated metal anode using commutation power supply again
Method leads to the increased main problem-anode plate problem of passivation of energy consumption during preparing, to improve efficiency；It is double using three Room
Three electrolysis device of diaphragm utilizes the double diaphragms in three Room and double sun while solving the problems, such as anodic passivity using commutation power supply
Pole is designed, and original anode becomes cathode when passing through the current of commutation, remaining metal iron anode is started to work, and realization was entirely electrolysed
Cheng Jun has iron anode to be electrolysed, and provides enough iron ions, and continuing commutation after original anodic passivity film is eliminated makes it again
Continue to provide iron ion as anode, whole device uninterruptedly produces, and improves efficiency, the ferrate generated using the device
Handle various organic wastewaters.
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| CN201810288797.8A CN108411321B (en) | 2018-04-03 | 2018-04-03 | Device and method for preparing ferrate by double-membrane three-chamber electrolytic cell |
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| CN110438518A (en) * | 2019-08-23 | 2019-11-12 | 中国恩菲工程技术有限公司 | The device and method for preparing ferrate |
| RU196524U1 (en) * | 2019-10-03 | 2020-03-03 | Общество с ограниченной ответственностью «Экотех» | DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM |
| CN111547901A (en) * | 2020-05-07 | 2020-08-18 | 中南大学 | In-situ generated hydrogen peroxide and ferrate coupling water treatment deep purification device and treatment method |
| CN111903268A (en) * | 2020-08-15 | 2020-11-10 | 宁夏农林科学院 | Alkali extraction machine for treating saline-alkali soil |
| CN114349130A (en) * | 2022-03-11 | 2022-04-15 | 深圳合续科技开发有限公司 | Electrolytic dephosphorization device with constant electrolytic current |
| EP4112779A1 (en) * | 2021-06-29 | 2023-01-04 | Evonik Functional Solutions GmbH | Three-chamber electrolysis cell for the production of alkali metal alcoholate |
| US11629415B2 (en) | 2020-03-24 | 2023-04-18 | Evonik Functional Solutions Gmbh | Process for preparing sodium alkoxides |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110438518A (en) * | 2019-08-23 | 2019-11-12 | 中国恩菲工程技术有限公司 | The device and method for preparing ferrate |
| RU196524U1 (en) * | 2019-10-03 | 2020-03-03 | Общество с ограниченной ответственностью «Экотех» | DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM |
| US11629415B2 (en) | 2020-03-24 | 2023-04-18 | Evonik Functional Solutions Gmbh | Process for preparing sodium alkoxides |
| CN111547901A (en) * | 2020-05-07 | 2020-08-18 | 中南大学 | In-situ generated hydrogen peroxide and ferrate coupling water treatment deep purification device and treatment method |
| CN111547901B (en) * | 2020-05-07 | 2021-06-29 | 中南大学 | In-situ generated hydrogen peroxide and ferrate coupling water treatment deep purification device and treatment method |
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| EP4112779A1 (en) * | 2021-06-29 | 2023-01-04 | Evonik Functional Solutions GmbH | Three-chamber electrolysis cell for the production of alkali metal alcoholate |
| WO2023274794A1 (en) * | 2021-06-29 | 2023-01-05 | Evonik Functional Solutions Gmbh | Three-chamber electrolytic cell for the production of alkali metal alkoxides |
| CN114349130A (en) * | 2022-03-11 | 2022-04-15 | 深圳合续科技开发有限公司 | Electrolytic dephosphorization device with constant electrolytic current |
| CN114349130B (en) * | 2022-03-11 | 2022-06-24 | 深圳合续科技开发有限公司 | Electrolytic dephosphorization device with constant electrolytic current |
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