CN102179231A - Absorbing agent for separating formaldehyde from air and preparation method thereof - Google Patents
Absorbing agent for separating formaldehyde from air and preparation method thereof Download PDFInfo
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- CN102179231A CN102179231A CN201110103852XA CN201110103852A CN102179231A CN 102179231 A CN102179231 A CN 102179231A CN 201110103852X A CN201110103852X A CN 201110103852XA CN 201110103852 A CN201110103852 A CN 201110103852A CN 102179231 A CN102179231 A CN 102179231A
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Abstract
The invention provides an absorbing agent for separating formaldehyde from air and a preparation method thereof. The absorbing agent is obtained by taking red mud produced by the Bayer-process aluminium-smelting technique as a precursor and carrying out chemical modification and high-temperature roasting. The absorbing agent is red particles, the distribution range of internal micropore diameter of the absorbing agent is 0.9-2.7nm, and the appearance size is 0.45-0.9mm, so that the absorbing agent is beneficial to catching and removing trace formaldehyde in the air. In the absorbing agent provided by the invention, compared with the existing material for formaldehyde absorption, catalysis and purification, under a high air speed, the gas-phase low concentration formaldehyde can be absorbed in a high-efficiency manner, the absorption capacity is large, the service life is long, the used raw materials are from solid slag, namely red mud produced in the aluminium-smelting process in the aluminium industry, the source is wide, the cost is low, the prepared absorbing agent can achieve the purpose of using waste to treat harm and is beneficial to realizing clean production.
Description
Technical field
The invention belongs to technical field of air purification processing, be specifically related to a kind of from air adsorbent and preparation method thereof of efficient separating formaldehyde.
Background technology
Formaldehyde extensively is present among the air ambient, and especially building is indoor, and airtight or semi-hermetic cabin such as spacecraft, submarine, subway, is one of main air pollutants of confined space environment.The source more complicated of formaldehyde mainly comprises urea aldehyde/phenolic resin glue wood-based plate, as glued board, core-board, medium density fibre board (MDF) and particieboard; The ornament materials that contains formaldehyde is as wallpaper, coating, adhesive, urea-formaldehyde foam insulating materials and plastic floor; Distribute display and adornment in the indoor and cabin of formaldehyde, as furniture, chemical fibre carpet and foamed plastics; The material of formaldehyde is distributed in burning, as domestic fuel burning, cigarette combustion; Daily necessities is as cosmetics, cleaning agent, anticorrisive agent, printing ink and textile fabric.
Formaldehyde mainly shows aspects such as allotriosmia, stimulation, allergy, abnormal pulmonary function, dysfunction of liver and immunologic dysfunction to health effects.Long-term contact low concentration formaldehyde can cause chronic respiratory disease, degradation under nasopharyngeal carcinoma, colon cancer, the cancer of the brain, paramenia, nuclear gene mutation, pregnancy syndrome, leukaemia, memory and the intelligence.In all contactees, children, pregnant woman and old man's PARA FORMALDEHYDE PRILLS(91,95) are particularly responsive, endanger also bigger.International cancer research organization has advised it is treated as suspect carcinogen.
At present, for the processing of low concentration formaldehyde in the Air and Water in Limited Space, mainly adopt methods such as low-temperature catalytic oxidation, absorption, photocatalysis and low temperature plasma oxidation to handle.Studies show that, low-temperature catalytic oxidation can be carbon dioxide and water with oxidation of formaldehyde effectively, but, when formaldehyde and the coexistence of benzene series thing, other method outside the needs employing is low-temperature catalyzed solves the purified treatment problem of benzene series thing, this certainly will make the investment of treatment system and operating cost increase, and the maintenance management difficulty increases.
Absorption is main adopts the metal oxide of porous and the formaldehyde that the nonmetal oxide material comes adsorbing separation gas phase low concentration, because these sorbing material pore volumes and specific area are limited, thereby adsorption capacity is lower, and service life is very short.Simultaneously, when the coexistence of formaldehyde and benzene series thing, need equally to adopt other method solve the purified treatment problem of benzene series thing, thereby bring problems such as treatment system complexity, investment and operating cost height, maintenance management difficulty are big.
The low temperature plasma oxidation has the effect that purifies formaldehyde and benzene series thing concurrently, but, the processing energy consumption is higher, and when only relying on the low temperature plasma oxidation processes, because oxidation is not thorough, can form harmful intermediate product, simultaneously, if adopt charging method to produce low temperature plasma, also can form harmful discharging product such as ozone and nitrogen dioxide.
Photochemical catalytic oxidation efficient is lower, and oxidation is not thorough, also can generate other harmful incomplete oxidation products, causes secondary pollution.In addition, when formaldehyde and the coexistence of benzene series thing, not only need to adopt other method to solve the purified treatment problem of benzene series thing, and the benzene series thing also may cause the photochemical catalyst poisoning.
Summary of the invention
At problems of the prior art, the invention provides a kind of being used for, at air speed (the reflection time of staying of air-flow in adsorbent bed, the h of unit from adsorbent of air separating formaldehyde and preparation method thereof
-1, air speed is high more, and the time of staying of air-flow in adsorbent is short more) be 10000～50000h
-1Condition under, adsorbent provided by the invention is the formaldehyde in the separation of air effectively, and adsorption capacity is big, long service life.And employed precursor is a red mud, and a kind of solid slag that derives from the aluminium industry aluminium metallurgy process has wide material sources, cheap advantage.
The invention provides a kind of being used for from the adsorbent of air separating formaldehyde, this adsorbent is done precursor with the red mud that the Bayer process technology for smelting aluminium is produced, through what obtain after chemical modification and the high-temperature roasting, the interior microscopic pore size distribution range of this adsorbent is 0.9～2.7nm, helps the seizure of trace formaldehyde in the air is removed.This adsorbent is the red granules thing, and the apparent size size is 0.45～0.9mm.The composition of this adsorbent according to percentage by weight be silica (10～15wt%), iron oxide (20～25wt%), aluminium oxide (10～15wt%) and other micro constitutents (sodium, calcium, titanyl compound and calcination loss part, 45～50wt%), its component content is identical with common red mud, promptly the red mud composition that is produced with the Bayer process technology for smelting aluminium is identical, and just the inner pore size distribution range of adsorbent partly transforms to micropore after modification.
The present invention also provides a kind of preparation of adsorbent method that is used for from the air separating formaldehyde, specifically may further comprise the steps:
Step 1: directly dissolve the cleaning precursor with deionized water, this precursor is the red mud that the Bayer process technology for smelting aluminium is produced, composition is silica, iron oxide, aluminium oxide, calcium oxide, sodium oxide molybdena, antimony oxide and calcination loss part, and the mass ratio of precursor and deionized water is 1: 20～1: 10;
Step 2: the precursor after will cleaning takes out, and places drying box, and drying is 12～16 hours under 100～110 ℃.Will the precursor after super-dry is handled being ground to particle size is 0.18～0.28mm;
Step 3: be 1%～30% H with concentration range
2O
2The precursor of solution and 0.18～0.28mm is that 1: 5～1: 10 ratio is mixed in liquid-solid ratio, modification on Rotary Evaporators, and the modification soak time is 1～4h, rotating speed 40～60r/min, 50～60 ℃ of bath temperatures obtain the precursor of modification; Described liquid-solid ratio is meant H
2O
2The ratio of the quality (g) of volume of solution (mL) and precursor.
Step 4: the modification precursor that obtains and deionized water and the methylcellulose ratio according to 100: 15: 1.5～100: 27: 2.7 (weight ratio) is mixed, and compacting obtains sheet modification precursor in flakes in the pressure limit of 8～14MPa;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, the sintering temperature scope is 300～700 ℃, the time 2～8h of roasting; Naturally cool to room temperature after the taking-up, grind to form 0.45～0.9mm, obtain of the present invention being used for from the adsorbent of air separating formaldehyde.
The invention has the advantages that:
1) a kind of being used for provided by the invention from adsorbent of air separating formaldehyde and preparation method thereof, this adsorbent is compared with the catalytic purification material with existing formaldehyde absorption, under high-speed, and the efficient adsorbing separation gas phase low concentration formaldehyde of energy, and adsorption capacity is big, long service life.Particularly the raw material of Shi Yonging derive from the solid slag that produces in the aluminium industry aluminium metallurgy process, and wide material sources are cheap, make can reach with useless behind the adsorbent and control harmful purpose, help realizing cleaner production.
2) the invention provides a kind of being used for from adsorbent of air separating formaldehyde and preparation method thereof, compare with technology such as existing photochemical catalytic oxidation, low-temperature plasma oxidations, utilizing adsorbent provided by the invention to carry out adsorption cleaning handles, purify thoroughly, new pollutant can be do not produced, secondary pollution can be do not caused.
3) the invention provides a kind of room or air cleaning airtight, the semi-hermetic cabin that is used for being particularly useful for containing from the adsorbent of air separating formaldehyde low concentration formaldehyde or low concentration formaldehyde and the coexistence of other VOC handles.
Description of drawings:
Fig. 1: a kind of preparation of adsorbent method flow diagram that is used for from the air separating formaldehyde that the present invention proposes.
The specific embodiment:
The present invention is described in detail below in conjunction with drawings and Examples.
The invention provides a kind of being used for from the adsorbent of air separating formaldehyde, this adsorbent is done precursor with the red mud that the Bayer process technology for smelting aluminium is produced, through what obtain after chemical modification and the high-temperature roasting, the interior microscopic pore size distribution range of this adsorbent is 0.9～2.7nm, helps the seizure of trace formaldehyde in the air is removed.This adsorbent is the red granules thing, and the apparent size size is 0.45～0.9mm.The composition of this adsorbent according to percentage by weight be silica (10～15wt%), iron oxide (20～25wt%), aluminium oxide (10～15wt%) and other micro constitutents (sodium, calcium, titanyl compound and calcination loss part, 45～50wt%), its component content is identical with common red mud, promptly the red mud composition that is produced with the Bayer process technology for smelting aluminium is identical, and just the inner pore size distribution range of adsorbent partly transforms to micropore after modification.
Under normal pressure, room temperature (10MPa, 23 ℃) condition, air speed is 10000～50000h
-1In the scope, concentration of formaldehyde is 3～5mg/m
3The time, the time of break-through of the adsorbent that the present invention is prepared reaches 10～13h.
The present invention also provides a kind of preparation of adsorbent method that is used for from the air separating formaldehyde, as shown in Figure 1, specifically may further comprise the steps:
Step 1: directly dissolve the cleaning precursor with deionized water, this precursor is the red mud that the Bayer process technology for smelting aluminium is produced, composition is silica, iron oxide, aluminium oxide, calcium oxide, sodium oxide molybdena, antimony oxide and calcination loss part, and the mass ratio of precursor and deionized water is 1: 20～1: 10;
Step 2: the precursor after will cleaning takes out, and places drying box, and drying is 12～16 hours under 100～110 ℃.Will the precursor after super-dry is handled being ground to particle size is 0.18～0.28mm;
Step 3: be 1%～30% H with concentration range
2O
2The precursor of solution and 0.18～0.28mm is that 1: 5～1: 10 ratio is mixed in liquid-solid ratio, carry out chemical modification on Rotary Evaporators, the modification soak time is 1～4h, rotating speed 40～60r/min, 50～60 ℃ of bath temperatures obtain the precursor of modification; Described liquid-solid ratio is meant H
2O
2The ratio of the quality (g) of volume of solution (mL) and precursor.
Step 4: the modification precursor that obtains and deionized water and the methylcellulose ratio according to 100: 15: 1.5～100: 27: 2.7 (weight ratio) is mixed, and compacting obtains sheet modification precursor in flakes in the pressure limit of 8～14MPa;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, the sintering temperature scope is 300～700 ℃, the time 2～8h of roasting; Naturally cool to room temperature after the taking-up, grind to form 0.45～0.9mm, obtain of the present invention being used for from the adsorbent of air separating formaldehyde.
Under normal pressure, room temperature condition (10MPa, 23 ℃), air speed is 10000～50000h with the adsorbent that obtains
-1In the scope, the absorption property of the adsorbent of the present invention preparation is tested, the result shows, is 3.69mg/m at concentration of formaldehyde
3, relative humidity is 23% o'clock, the time of break-through of the adsorbent that the present invention is prepared is up to 13h.
Adsorbent among the present invention can directly be placed in the air and maybe this adsorbent be placed in the cleaning equipment, can be used in the clean room or the formaldehyde of air in closed space, and the mixture of formaldehyde and benzene series thing.
Embodiment 1: preparation is numbered 1～16# adsorbent, and the preparation method is as follows:
Step 1: use the washed with de-ionized water precursor, the mass ratio of precursor and deionized water is 1: 20;
Step 2: the precursor after will cleaning takes out, and places drying box, dry 12h under 110 ℃, and it is 0.18mm that the powder precursor thing that obtains is ground to particle size;
Step 3: with the H of 100ml variable concentrations
2O
2The precursor that solution and 20g drying and grinding are good mixes, and mixes the back and carries out modification on Rotary Evaporators, Rotary Evaporators rotating speed 60r/min, 50 ℃ of bath temperatures, different modification time, soak time and different H
2O
2The concentration of solution is as shown in table 1 respectively, obtains the precursor of modification;
Step 4: the precursor after the modification and deionized water and the methylcellulose weight ratio according to 100: 27: 2.7 is mixed, under different film-making pressure (as shown in table 1), be pressed into sheet, obtain sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, sintering temperature and roasting time are as shown in table 1; Naturally cool to room temperature after the taking-up, grind to form 0.45mm, obtain 1～16# adsorbent under totally 16 kinds of different preparation conditions.
1～16# preparation of adsorbent condition among table 1: the embodiment 1
It is the quartz tube reactor of 10mm that the 1～16# kind adsorbent that obtains is placed internal diameter respectively, feeds to contain formaldehyde 3.69mg/m
3Air, tolerance is 600ml/min, air speed is 18000h
-1, under atmospheric pressure at room (10MPa, 23 ℃), carry out the absorption property evaluation, it is as shown in table 2 to record time of break-through (adsorption bed outlet concentration of formaldehyde is 10% with the ratio of entrance concentration):
As shown in Table 2, H
2O
2Concentration is 20%, and soak time is 4h, and film-making pressure is 10MPa, and sintering temperature is 300 ℃, and when roasting time was 6h, the adsorbent that obtains reached best time of break-through 13h.
1～16# adsorbent is to containing the adsorption penetration timetable of formaldehyde air among table 2: the embodiment 1
| The adsorbent numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Time of break-through, h | 8 | 12 | 9.5 | 5.5 | 7 | 2 | 12 | 8 |
| The adsorbent numbering | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Time of break-through (h) | 5 | 7 | 7.5 | 13 | 9 | 8.5 | 2 | 5 |
Embodiment 2: preparation is numbered 17～21# adsorbent
Step 1: use the washed with de-ionized water precursor, the mass ratio of precursor and deionized water is 1: 20;
Step 2: the precursor after will cleaning takes out, and places drying box, dry 12h under 110 ℃, and it is 0.18mm that the powder precursor thing that obtains is ground to particle size;
Step 3: with 100ml H
2O
2Solution and the precursor that the 20g drying and grinding is good mix the back and carry out modification on Rotary Evaporators, Rotary Evaporators rotating speed 60r/min, 50 ℃ of bath temperatures, soak time and H
2O
2The concentration of solution is as shown in table 3 respectively;
Step 4: the precursor after the modification and deionized water and the methylcellulose weight ratio according to 100: 27: 2.7 is mixed, under different film-making pressure (as shown in table 3), be pressed into sheet, obtain sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, sintering temperature and roasting time are as shown in table 3; Naturally cool to room temperature after the taking-up, grind to form 0.45mm, obtain 17～21 adsorbents under totally 5 kinds of different preparation conditions.
Among table 3: the embodiment 2: 17～21# preparation of adsorbent condition
| Numbering | H 2O 2Concentration | Soak time | Film-making pressure | Sintering temperature | Roasting time |
| /％ | /h | /MPa | /℃ | /h | |
| 17 | 20％ | 3 | 10 | 300 | 4 |
| 18 | 20％ | 3 | 10 | 400 | 4 |
| 19 | 20％ | 3 | 10 | 500 | 4 |
| 20 | 20％ | 3 | 10 | 600 | 4 |
| 21 | 20％ | 3 | 10 | 700 | 4 |
To place internal diameter respectively be the quartz tube reactor of 10mm with 17～20# adsorbent that is numbered of obtaining, and feeds to contain formaldehyde 3.69mg/m
3Air, tolerance is 600ml/min, air speed is 18000h
-1, under atmospheric pressure at room (10MPa, 23 ℃), carry out the absorption property evaluation, it is as shown in table 4 to record time of break-through (adsorption bed outlet concentration of formaldehyde is 10% with the ratio of entrance concentration), as can be seen from Table 4, sintering temperature is 300 ℃, and the time of break-through of gained adsorbents adsorb formaldehyde is the longest.When sintering temperature is low, the absorption of the mud adsorbent PARA FORMALDEHYDE PRILLS(91,95) that helps preparing.
17～20# adsorbents adsorb formaldehyde time of break-through the table that obtains among table 4: the embodiment 2
Embodiment 3: preparation is numbered 22～25# adsorbent
Step 1: use the washed with de-ionized water precursor, the mass ratio of precursor and deionized water is 1: 20;
Step 2: the precursor after will cleaning takes out, and places drying box, dry 12h under 110 ℃, and it is 0.18mm that the powder precursor thing that obtains is ground to particle size;
Step 3: with 100ml H
2O
2Solution and the precursor that the 20g drying and grinding is good mix the back and carry out modification on Rotary Evaporators, Rotary Evaporators rotating speed 60r/min, 50 ℃ of bath temperatures, soak time and H
2O
2The concentration of solution is as shown in table 5 respectively;
Step 4: the precursor after the modification and deionized water and the methylcellulose weight ratio according to 100: 27: 2.7 is mixed, under different film-making pressure (as shown in table 5), be pressed into sheet, obtain sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, sintering temperature and roasting time are as shown in table 5; Naturally cool to room temperature after the taking-up, grind to form 0.45mm, obtain 22～25 adsorbents under totally 4 kinds of different preparation conditions.
Among table 5: the embodiment 3: 22～25# preparation of adsorbent condition
To place internal diameter respectively be the quartz tube reactor of 10mm with 22～25# adsorbent that is numbered of preparing, and feeds to contain formaldehyde 3.69mg/m
3Air, tolerance is 600ml/min, air speed is 18000h
-1At atmospheric pressure at room (10MPa, 23 ℃) under carry out the absorption property evaluation, record under the different air speed conditions, it is as shown in table 6 to record time of break-through (adsorption bed outlet concentration of formaldehyde is 10% with the ratio of entrance concentration), as shown in Table 6, and when sintering temperature is low, the gained adsorbent is under various air speed conditions, and the time of break-through that formaldehyde is removed in absorption is all the longest.
22～25# adsorbent that table 6: embodiment 3 obtains is absorbing formaldehyde time of break-through table under different air speeds
Embodiment 4: preparation is numbered 26～29# adsorbent:
Step 1: use the washed with de-ionized water precursor, the mass ratio of precursor and deionized water is 1: 20;
Step 2: the precursor after will cleaning takes out, and places drying box, dry 12h under 110 ℃, and it is 0.18mm that the powder precursor thing that obtains is ground to particle size;
Step 3: with 100ml H
2O
2Solution and the precursor that the 20g drying and grinding is good mix the back and carry out modification on Rotary Evaporators, Rotary Evaporators rotating speed 60r/min, 50 ℃ of bath temperatures, soak time and H
2O
2The concentration of solution is not respectively as table 7;
Step 4: the precursor after the modification and deionized water and the methylcellulose weight ratio according to 100: 27: 2.7 is mixed, under different film-making pressure (as shown in table 7), be pressed into sheet, obtain sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, sintering temperature and roasting time are as shown in table 7; Naturally cool to room temperature after the taking-up, grind to form 0.45mm, obtain 26～29# adsorbent under totally 4 kinds of different preparation conditions.
26～29# preparation of adsorbent condition among table 7: the embodiment 4
Get and be numbered 26～29# adsorbent, placing internal diameter is the quartz tube reactor of 10mm, and feeding the tolerance that contains formaldehyde is 600ml/min, and air speed is 18000h
-1, under atmospheric pressure at room (10MPa, 23 ℃), carry out the absorption property evaluation, record under the different concentration of formaldehyde conditions, it is as shown in table 8 to record time of break-through (adsorption bed outlet concentration of formaldehyde is 10% with the ratio of entrance concentration).As shown in Table 8, when film-making pressure was 10MPa, the adsorption time of gained adsorbent absorbing formaldehyde under various concentration of formaldehyde was all the longest.
Adsorbents adsorb formaldehyde time of break-through table under the different concentration of formaldehyde of table 8
Embodiment 5: be used for preparation of adsorbent method in the present embodiment, specifically may further comprise the steps from the air separating formaldehyde:
Step 1: use the washed with de-ionized water precursor, the mass ratio of precursor and deionized water is 1: 10;
Step 2: the precursor after will cleaning takes out, and places drying box, dry 12h under 110 ℃, and it is 0.28mm that the powder precursor thing that obtains is ground to particle size;
Step 3: be 20% H with 100ml concentration
2O
2Solution and the precursor that the 10g drying and grinding is good mix the back and carry out modification on Rotary Evaporators, Rotary Evaporators rotating speed 40r/min, and the modification soak time is 2h, 60 ℃ of bath temperatures soak modification on Rotary Evaporators, obtain the precursor of modification;
Step 4: the precursor after the modification and deionized water and the methylcellulose weight ratio according to 100: 15: 1.5 is mixed, under 8MPa film-making pressure, be pressed into sheet, obtain sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, sintering temperature is 300 ℃, and roasting time is 5h; Naturally cool to room temperature after the taking-up, grind to form 0.9mm, obtain final adsorbent.
Claims (10)
1. one kind is used for from the adsorbent of air separating formaldehyde, it is characterized in that: the precursor of described adsorbent is a red mud, the interior microscopic pore size distribution range is 0.9～2.7nm, the apparent size size is 0.45～0.9mm, this adsorbent is the red granules thing, and the composition of adsorbent is sodium, calcium, titanyl compound and the calcination loss part of 10～15wt% silica, 20～25wt% iron oxide, 10～15wt% aluminium oxide and 45～50wt% according to percentage by weight.
2. a kind of being used for according to claim 1 is characterized in that from the adsorbent of air separating formaldehyde: the red mud that described red mud produces for the Bayer process technology for smelting aluminium.
3. a kind of being used for according to claim 1 is characterized in that from the adsorbent of air separating formaldehyde:
4. a kind of being used for according to claim 1 is characterized in that from the adsorbent of air separating formaldehyde: described adsorbent is 10MPa at atmospheric pressure, and under 23 ℃ of temperature, air speed is 10000～50000h
-1In the scope, concentration of formaldehyde is 3～5mg/m
3The time, time of break-through is 10～13h.
5. preparation of adsorbent method that is used for from the air separating formaldehyde is characterized in that: specifically may further comprise the steps:
Step 1: clean precursor with deionized water dissolving, this precursor is the red mud that the Bayer process technology for smelting aluminium is produced, and the mass ratio of precursor and deionized water is 1: 20～1: 10;
Step 2: the precursor after will cleaning takes out, and places drying box, and drying is 12～16 hours under 100～110 ℃.Will the precursor after super-dry is handled being ground to particle size is 0.18～0.28mm;
Step 3: with concentration is 1%～30%H
2O
2Solution and precursor are that 1: 5～1: 10 ratio is mixed in liquid-solid ratio, modification on Rotary Evaporators, and the modification soak time is 1～4h, rotating speed 40～60r/min, 50～60 ℃ of bath temperatures obtain the precursor of modification;
Step 4: is that 100: 15: 1.5～100: 27: 2.7 ratio mixes with the modification precursor that obtains and deionized water, methylcellulose according to weight ratio, and is pressed into sheet under the film-making pressure of 8～14MPa, obtains sheet modification precursor;
Step 5: place Muffle furnace to carry out high-temperature roasting the sheet modification precursor that obtains, the sintering temperature scope is 300～700 ℃, the time 2～8h of roasting; Naturally cool to room temperature after the taking-up, grind to form 0.45～0.9mm, obtain final adsorbent.
6. a kind of preparation of adsorbent method that is used for from the air separating formaldehyde according to claim 6 is characterized in that: described H
2O
2Solution concentration is 20～30%.
7. a kind of preparation of adsorbent method that is used for from the air separating formaldehyde according to claim 6, it is characterized in that: described soak time is 3～4h
8. a kind of preparation of adsorbent method that is used for from the air separating formaldehyde according to claim 6, it is characterized in that: described film-making pressure is 10～13MPa.
9. a kind of preparation of adsorbent method that is used for from the air separating formaldehyde according to claim 6, it is characterized in that: described sintering temperature is 300～400 ℃.
10. a kind of preparation of adsorbent method that is used for from the air separating formaldehyde according to claim 6, it is characterized in that: described roasting time is 4～6h.
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| CN105749856A (en) * | 2016-03-28 | 2016-07-13 | 柳州联海科技有限公司 | Adsorbing material capable of effectively removing formaldehyde from air |
| CN109734090A (en) * | 2019-03-26 | 2019-05-10 | 安徽工业大学 | A kind of steel slag based biomass active carbon and preparation method thereof for degradation of formaldehyde |
| CN109775711A (en) * | 2019-04-02 | 2019-05-21 | 安徽工业大学 | A kind of Bayer process red mud modified activated carbon and preparation method thereof for degradation of formaldehyde |
| CN109809404A (en) * | 2019-04-04 | 2019-05-28 | 安徽工业大学 | A kind of Bayer process red mud modification biological activated carbon and preparation method thereof for degradation of formaldehyde |
| CN109821504A (en) * | 2019-03-26 | 2019-05-31 | 安徽工业大学 | A kind of composite modified active carbon and preparation method thereof for degradation of formaldehyde |
| CN112007609A (en) * | 2020-08-27 | 2020-12-01 | 桂林理工大学 | Preparation method and application of Fe-Mg/mulberry stalk biochar composite material |
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| CN112007609A (en) * | 2020-08-27 | 2020-12-01 | 桂林理工大学 | Preparation method and application of Fe-Mg/mulberry stalk biochar composite material |
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