CN112062225A - Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode - Google Patents

Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode Download PDF

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CN112062225A
CN112062225A CN202010774556.1A CN202010774556A CN112062225A CN 112062225 A CN112062225 A CN 112062225A CN 202010774556 A CN202010774556 A CN 202010774556A CN 112062225 A CN112062225 A CN 112062225A
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wastewater
sulfur
persulfate
activated carbon
electrode
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黄张根
齐菲
曾泽泉
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Shanxi Institute of Coal Chemistry of CAS
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Shanxi Institute of Coal Chemistry of CAS
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C02F2101/345—Phenols

Abstract

The invention belongs to the field of organic wastewater treatment, and discloses a method for degrading organic matters by three-dimensional electroactive persulfate through a sulfur-doped activated carbon particle electrode, which comprises the following steps: introducing the wastewater into a reactor, simultaneously adding persulfate (5 mmol/L-25 mmol/L) and co-electrolyte (5 mmol/L-50 mmol/L) into the wastewater, and starting stirring; adding a sulfur-doped activated carbon particle electrode (0.05 g/L-0.2 g/L) into the wastewater; applying voltage to the wastewater by two electrodes connected with a DC power supply to form current (1 mA/cm)2‑4mA/cm2) Starting the reaction, and discharging the treated wastewater after 30-60 min. The invention proves that the three-dimensional electrocatalysis and sulfur-doped active carbon is used for activating persulfateThe process has a synergistic effect, and the degradation rate of pollutants can be effectively improved.

Description

Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode
Technical Field
The invention belongs to the field of organic wastewater treatment, and relates to a method for degrading organic matters by three-dimensional electroactive persulfate through a sulfur-doped activated carbon particle electrode.
Background
With the development of industrialization, a large amount of toxic and non-degradable organic matters are discharged into the environment, and serious threat is caused to the water body safety. In recent years, the advanced oxidation technology of carbon material activated persulfate has attracted much attention because of its simple system, simple operation and capability of thoroughly solving the problem of secondary pollution caused by metal residue. However, the activity of the traditional activated carbon material is limited, which affects the wide application of the traditional activated carbon material in the field.
In response to the above problems, studies have demonstrated that two-dimensional electroactive persulfates using carbon material electrodes can improve the catalytic process. However, the activation of persulfate mainly occurs on the surface of the carbonaceous electrode, and the lower specific surface and the poor mass transfer performance of the two-dimensional electrode are important limiting factors for improving the activity. Therefore, a three-dimensional electrochemical process with larger contact area, better surface mass transfer and higher current efficiency is undoubtedly a better choice.
In order to solve the problems, numerous scholars effectively regulate and control the physical and chemical properties and improve the catalytic activity of the carbon material by doping and modifying functional groups on the surface of the carbon material. Wherein, the performance of the in-situ sulfur-doped activated carbon activated persulfate is obviously superior to that of the traditional activated carbon and transition metal oxide (Applied Catalysis B: Environmental, 2018, 220: 635-644). Meanwhile, larger capacitance can be obtained by doping sulfur atoms in the graphite crystal lattice, more migration electrons can be accommodated under the same voltage, and the capability of electrode induction generation and electron transmission of the carbon material particles is greatly improved. Thus, sulfur-doped carbon materials have excellent catalytic activity for activating persulfates as well as electrocatalytic processes.
The only current three-dimensional electroactive persulfate research uses metal oxides (CuFe)204、MnO2) As a particle electrode (Science of the Total Environment,2017, 609: 644-654; chemical Engineering Journal,2019, 361: 1317-. The above disadvantages can be overcome if a sulfur-doped activated carbon particle electrode three-dimensional electroactive persulfate system is used to degrade contaminants.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an environment-friendly, efficient and reliable method for degrading organic wastewater by using sulfur-doped activated carbon particle electrode three-dimensional electroactive persulfate.
A method for degrading organic matters by three-dimensional electroactive persulfate of a sulfur-doped activated carbon particle electrode comprises the following steps:
(1) introducing the wastewater into a reactor, simultaneously adding persulfate (5 mmol/L-25 mmol/L) and co-electrolyte (5 mmol/L-50 mmol/L) into the wastewater, and starting stirring;
(2) adding a sulfur-doped activated carbon particle electrode (0.05 g/L-0.2 g/L) into the wastewater;
(3) applying voltage to the wastewater by two electrodes connected with a DC power supply to form current (1 mA/cm)2-4mA/cm2) Starting the reaction, and discharging the treated wastewater after 30-60 min.
The persulfate as described above is a peroxymonosulfate or peroxydisulfate.
The co-electrolyte used is sodium sulfate, potassium sulfate, sodium nitrate or sodium chloride.
The preparation method of the sulfur-doped activated carbon particle electrode in the step (2) comprises the following steps:
uniformly mixing polyphenylene sulfide and potassium carbonate according to the mass ratio of 1:1-2, activating for 2h at 650-950 ℃ in an argon atmosphere, washing a sample with dilute hydrochloric acid and distilled water respectively until the supernatant is neutral, and drying the sample for 12h at 110 ℃ to obtain the sulfur-doped active carbon.
The electrode in the step (3) is a mesh electrode, and the positive electrode connected with the positive electrode of the direct current power supply is made of Ti/IrO2-RuO2The cathode electrode connected with the cathode of the direct current power supply is made of Ti.
The invention has the beneficial effects that:
the invention proves that three-dimensional electrocatalysis and sulfur-doped active carbon have synergistic effect in the process of activating persulfate, and the degradation rate of pollutants can be effectively improved.
At present, only three-dimensional electroactive persulfate is researched and used by using metal oxide as a particle electrode, and the problem of low activation performance of the persulfate of the particle electrode is solved, but the problems of low specific surface of metal oxidation and secondary pollution of metal dissolution are limited. The method improves the persulfate activation efficiency and the pollutant degradation rate, is environment-friendly and pollution-free, is a green and efficient technology, and provides a new idea for the efficient treatment of pollutants difficult to degrade.
Detailed Description
The invention provides a method for degrading organic matters by three-dimensionally and electrically activating persulfate through a sulfur-doped activated carbon particle electrode, which comprises the following steps:
introducing 50ppm phenol wastewater into a reactor, simultaneously adding 5mmol/L-25mmol/L persulfate and 5mmol/L-50mmol/L co-electrolyte into the wastewater, starting stirring, adding 0.05g/L-0.2g/L sulfur-doped activated carbon particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current (1 mA/cm)2-4mA/cm2) Starting the reaction, and discharging the treated wastewater after the reaction lasts for 30-60 min.
A typical method for preparing a sulfur-doped activated carbon particle electrode is as follows:
uniformly mixing 5g of polyphenylene sulfide and 10g of potassium carbonate, respectively activating at 650 ℃, 750 ℃, 850 ℃ and 950 ℃ for 2h under the argon atmosphere, wherein the heating rate is 5 ℃/min, after the sample is naturally cooled to the room temperature, respectively washing with dilute hydrochloric acid and distilled water until the supernatant is neutral, then drying the sample at 110 ℃ for 12h, and respectively recording the obtained sulfur-doped activated carbon as ACS-650, ACS-750, ACS-850 and ACS-950.
Respectively and uniformly mixing 5g of polyphenylene sulfide with 5g of potassium carbonate, 7.5g of potassium carbonate and 10g of potassium carbonate, activating for 2h at 850 ℃ under the argon atmosphere, heating at the rate of 5 ℃/min, respectively washing with dilute hydrochloric acid and distilled water until the supernatant is neutral after the sample is naturally cooled to the room temperature, then drying the sample at 110 ℃ for 12h, and respectively marking the obtained sulfur-doped active carbon as ACS-850-1, ACS-850-1.5 and ACS-850.
The present invention will be further described with reference to specific examples, but the present invention is not limited thereto.
Comparative example 1
Uniformly mixing 5g of polyphenyl ether and 10g of potassium carbonate, activating at 850 ℃ for 2h under the argon atmosphere, heating at the rate of 5 ℃/min, naturally cooling a sample to room temperature, washing with dilute hydrochloric acid and distilled water respectively until the supernatant is neutral, drying the sample at 110 ℃ for 12h, and marking the obtained activated carbon as AC-850 respectively.
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared AC-850 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start activated carbon/persulfate/electrocatalysis reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 55.5%.
Example 1
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L auxiliary electrolyte sodium sulfate into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 sulfur-doped activated carbon particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And when the reaction is carried out for 60min, the phenol removal rate is 100 percent.
According to the data of the comparative example and the example 1, compared with the non-doped AC-850 particle electrode, the phenol removal rate of the three-dimensional electroactive persulfate system of the doped-sulfur ACS-850 particle electrode is improved from 55.5 to 100 percent, which shows that the introduction of sulfur atoms effectively regulates the physicochemical properties of the activated carbon and greatly improves the catalytic activity of the activated carbon.
The wastewater is respectively treated by sulfur-doped activated carbon adsorption, persulfate oxidation, electrocatalytic oxidation, sulfur-doped activated carbon/electrocatalysis, persulfate/electrocatalysis, sulfur-doped activated carbon/persulfate and sulfur-doped activated carbon/persulfate/electrocatalysis for 60min according to the experimental conditions, and the removal rates of phenol are respectively 37.8%, 1.6%, 2.0%, 38.5%, 3.1%, 93.1% and 100%. Compared with a sulfur-doped active carbon/persulfate system (k =0.043 min)-1) Sulfur-doped activated carbon/persulfate/electrocatalytic system (k =0.083 min)-1) The phenol degradation rate is improved by 94%, and the fact that three-dimensional electrocatalysis and sulfur-doped active carbon have a synergistic effect in the persulfate activation process is proved, so that the technology can effectively improve the degradation rate of pollutants.
Example 2
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-650 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 55.6%.
Example 3
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-750 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 74.9%.
Example 4
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-950 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 94.4%.
Example 5
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850-1 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 82.1%.
Example 6
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol with the concentration of 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, stirring, adding 0.1g/L of the prepared ACS-850-1.5 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2Treating the water sample for 60min, wherein the phenol removal rate is 91.6 percent
Example 7
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 5mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 96.6%.
Example 8
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol with the concentration of 50ppm, simultaneously adding 25mmol/L potassium persulfate and 20mmol/L sodium sulfate as electrolytes into the wastewater, starting stirring, and adding 0.1g/L of the prepared potassium persulfate and sodium sulfate as electrolytes into the wastewaterACS-850 particle electrode, Ti/IrO connected to DC power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 97.2%.
Example 9
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.05g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 72.3%.
Example 10
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.2g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 100%.
Example 11
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 1mA/cm2Treating the water sample for 60min, wherein the phenol removal rate is 98.5%。
Example 12
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 4mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 96.0%.
Example 13
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 30min, wherein the phenol removal rate is 93.5%.
Example 14
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 45min, wherein the phenol removal rate is 98.0%.
Example 15
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol with the concentration of 50ppm, simultaneously adding 15mmol/L potassium persulfate and 5mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, and adding the wastewater into the reactorAdding 0.1g/L of the prepared ACS-850 particle electrode, and connecting with a direct current power supply through Ti/IrO2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 98.7%.
Example 16
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 50mmol/L sodium sulfate as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 100%.
Example 17
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L coelectrolyte potassium sulfate into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 100%.
Example 18
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol with the concentration of 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium nitrate as an auxiliary electrolyte into the wastewater, stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2Treating the water sample 60min, the phenol removal rate is 98.1%.
Example 19
Introducing 200mL of wastewater sample into a reactor, wherein the refractory organic matter is phenol, the concentration is 50ppm, simultaneously adding 15mmol/L potassium persulfate and 20mmol/L sodium chloride serving as an auxiliary electrolyte into the wastewater, starting stirring, adding 0.1g/L of the prepared ACS-850 particle electrode into the wastewater, and passing through a Ti/IrO connected with a direct current power supply2-RuO2The positive electrode and the Ti negative electrode apply voltage to the wastewater to form current to start the sulfur-doped active carbon/persulfate/electrocatalytic reaction, and the current density is controlled to be 2mA/cm2And treating the water sample for 60min, wherein the phenol removal rate is 97.1%.

Claims (6)

1. A method for degrading organic matters by three-dimensional electroactive persulfate of a sulfur-doped activated carbon particle electrode is characterized by comprising the following steps:
(1) introducing the wastewater into a reactor, adding 5mmol/L-25mmol/L persulfate and 5mmol/L-50mmol/L co-electrolyte into the wastewater, and starting stirring;
(2) adding a sulfur-doped activated carbon particle electrode of 0.05g/L-0.2g/L into the wastewater;
(3) applying voltage to the wastewater by two electrodes connected with a DC power supply to form 1mA/cm2-4mA/cm2The current starts the reaction, and after 30min-60min, the treated wastewater is discharged.
2. The method for degrading organic matters by three-dimensionally and electrically activating the persulfate through the sulfur-doped activated carbon particle electrode according to claim 1, wherein the electrode is a mesh electrode.
3. The electrode according to claim 1 or claim 2, wherein the positive electrode connected to the positive electrode of the DC power supply is Ti/IrO2-RuO2The cathode electrode connected with the cathode of the direct current power supply is made of Ti.
4. The method for degrading organic matters by three-dimensionally and electrically activating persulfate through the sulfur-doped activated carbon particle electrode according to claim 1, wherein the preparation method of the sulfur-doped activated carbon particle electrode comprises the following steps:
(1) uniformly mixing polyphenylene sulfide and potassium carbonate according to the mass ratio of 1:1-2, and activating for 2h at 650-950 ℃ in an argon atmosphere;
(2) washing the sample with dilute hydrochloric acid and distilled water respectively until the supernatant is neutral;
(3) and drying the sample at 110 ℃ for 12h to obtain the sulfur-doped activated carbon particle electrode.
5. The method for degrading organic matters by using the sulfur-doped activated carbon particle electrode three-dimensional electroactive persulfate as claimed in claim 1, wherein the persulfate used is peroxymonosulfate or peroxydisulfate.
6. The method for degrading organic matters by three-dimensionally and electrically activating the persulfate through the sulfur-doped activated carbon particle electrode according to claim 1, wherein the co-electrolyte used is sodium sulfate, potassium sulfate, sodium nitrate or sodium chloride.
CN202010774556.1A 2020-08-04 2020-08-04 Method for degrading organic matters by three-dimensional electroactive persulfate of sulfur-doped activated carbon particle electrode Pending CN112062225A (en)

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CN112517026A (en) * 2020-12-20 2021-03-19 中国科学院南京土壤研究所 Persulfate-activated non-metallic composition, and preparation method and application thereof
CN114132999A (en) * 2021-11-26 2022-03-04 宁波职业技术学院 Method for treating printing and dyeing wastewater by activating persulfate through anode electrochemistry

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Application publication date: 20201211