CN112456634A - Water body purification system device with photo/bioelectrochemical integrated module and application thereof - Google Patents
Water body purification system device with photo/bioelectrochemical integrated module and application thereof Download PDFInfo
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Abstract
A photo/bioelectrochemical integrated module water body purification system device and application thereof comprise a photo-catalytic system device and a bioelectrochemical processing unit, wherein the photo-catalytic system device comprises a solar photovoltaic cell, the bioelectrochemical processing unit comprises at least one group of circuits consisting of a biological anode, a composite cathode and an additional cathode, the composite cathode and the additional cathode are connected in parallel, the biological anode is a carbon material, the composite cathode takes the carbon material as a base material, cellulose carbon aerogel is synthesized in situ and modified, an iron-based oxide is loaded through coprecipitation, and graphene, iron oxide or molybdenum disulfide is loaded on the additional cathode as a catalyst. The invention quickly adsorbs trace organic micro-pollutants in the water body to the composite cathode, synchronously realizes catalytic oxidation decomposition into small molecules under the synergistic action of the additional cathode and an external light source system, and then deeply degrades into carbon dioxide and water through the biological anode, thereby realizing the high-efficiency purification of the micro-pollutants in the water body.
Description
Technical Field
The invention relates to the field of trace pollutant treatment, in particular to a water body purification system device with a photo/bioelectrochemical integrated module and application thereof.
Background
The trace organic pollutants can migrate for a long distance through various environmental media (air, water, organisms and the like) and exist in the environment for a long time, have long-term residue, biological accumulation, semi-volatility and high toxicity, and have serious harm to human health and ecological environment, such as polycyclic aromatic hydrocarbon, perfluorinated compounds, brominated flame retardants and the like. These substances are widely used in various industrial productions and daily lives, and enter the environment through sewage discharge, product waste and the like.
The current methods for removing trace organic pollutants in the environment mainly comprise physical methods, chemical methods and biological methods. The physical method mainly realizes the removal of pollutants through adsorption, and the method cannot realize the complete degradation of trace organic pollutants. The chemical method comprises photocatalytic oxidation, direct chemical oxidation and other technologies. The biological method is to degrade organic pollutants by using the growth and metabolism of microorganisms, but has the problems of low degradation efficiency and the like. Therefore, each method has respective advantages and disadvantages, and how to organically combine different methods to realize rapid, efficient and thorough degradation of trace organic pollutants is a research focus.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the problems, the invention provides a water body purification system device with a photo/bioelectrochemical integrated module and application thereof, which couple adsorption concentration, hydrogen peroxide production, photo/Fenton chemical oxidation and biodegradation into a whole and provide a new way for effectively solving the problem that trace organic pollutants in the environment are difficult to degrade.
The technical scheme is as follows: a photo/bioelectrochemistry integrated module water body purification system device comprises a photo-catalytic system device and a bioelectrochemical processing unit, wherein the photo-catalytic system device comprises a solar photovoltaic cell, the bioelectrochemical processing unit comprises at least one group of circuits consisting of a biological anode, a composite cathode and an additional cathode, the composite cathode and the additional cathode are connected in parallel, the biological anode is a carbon material, the composite cathode takes the carbon material as a base material, cellulose carbon aerogel is synthesized in situ and modified, an iron-based oxide is loaded through coprecipitation, and graphene, iron oxide or molybdenum disulfide is loaded on the additional cathode as a catalyst.
The light source required in the photocatalytic system device comprises sunlight, ultraviolet light or artificial visible light.
The low voltage range applied to the solar photovoltaic cell is 0.2V-0.8V.
The carbon materials of the biological anode, the composite cathode and the additional cathode electrode in the bioelectrochemical processing unit comprise graphite rods, carbon felts or carbon brushes.
The preparation steps of the composite cathode are as follows: (1) dispersing wood or bamboo raw materials into 10% sodium hydroxide solution by mass, stirring for 2-4 h at 60-90 ℃, and filtering; adding the filtered sample into a sodium chlorite solution with the pH of 4-5 and the concentration of 1 mol/L, stirring for 2-4 h at the temperature of 60-90 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension; (2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain a micro/nano cellulose suspension with good dispersibility, and placing a carbon material in the micro/nano cellulose suspension, wherein the mass ratio of the carbon material to the micro/nano cellulose suspension is 1 (1-10); (3) standing the cellulose suspension containing the carbon material prepared in the previous step at 40-80 ℃ for 2-10 h to obtain cellulose hydrogel containing the carbon material; (4) drying the cellulose hydrogel containing the carbon material at-40 to-80 ℃ for 24 to 36 hours by freeze drying to form cellulose aerogel; (5) carbonizing cellulose aerogel containing a carbon material for 2 h at the temperature of 700-; (6) and synthesizing the iron-based oxide on the cathode electrode material 1 in situ by using a coprecipitation method or an impregnation method, and finally preparing the composite cathode.
The iron-based oxide is Fe3O4Or Fe-Mn binary oxide.
The preparation method of the additional cathode is a coating method, a dipping method or an in-situ synthesis method.
The distance between the composite cathode and the additional cathode is 0.5-2 cm, and the distance between the biological anode and the additional cathode is 2-10 cm.
The application of the light/bioelectrochemistry integrated module water body purification system device in the treatment of trace organic pollutants in a water body.
The trace organic pollutants are organic pollutants with a benzene ring structure, and the organic pollutants with the benzene ring structure are pyrene, dichlorobiphenyl or tetrabromobisphenol A.
Has the advantages that: the additional cathode is used for generating hydrogen peroxide; cellulose carbon aerogel and an iron-based oxide which are synthesized in situ on the composite electrode, wherein the cellulose carbon aerogel catalyst can adsorb pollutants in a concentrated water body, and the iron-based oxide can generate Fenton reaction with hydrogen peroxide; the external light source system can activate hydrogen peroxide and adjust the Fenton system without being limited by the change of the pH value of the environment; the biological anode realizes the complete degradation of the micromolecular pollutants after the catalytic oxidation of the composite cathode. The invention quickly adsorbs trace organic micro-pollutants in the water body to the composite cathode, synchronously realizes catalytic oxidation decomposition into small molecules under the synergistic action of the additional cathode and an external light source system, and then deeply degrades into carbon dioxide and water through the biological anode, thereby realizing the high-efficiency purification of the micro-pollutants in the water body. The invention organically combines the functions of chemical oxidation, biodegradation, physical adsorption, low electrical stimulation and photocatalysis into a whole, solves the problems of low degradation efficiency, secondary pollution and the like of a single technology under the synergistic effect of different technologies, and realizes the thorough and efficient degradation of trace pollutants in water.
Drawings
Fig. 1 is a schematic structural diagram of a water body purification system of a photo/bio-electrochemical integrated module according to the invention. In the figure: 1. a solar photovoltaic cell; 2. an external circuit; 3. 3' external resistance; 4. 4' bioanode; 5. a 5' additional cathode; 6. 6' composite cathode; 7. a light source;
FIG. 2 is a schematic diagram of a composite cathode structure in a water purification system with a photo/bio-electrochemical integrated module according to the present invention;
FIG. 3 is a graph showing the performance of the treatment of contaminants in examples 1 to 4 and comparative experiments 1 to 4;
the data in fig. 4 are for the single technology control experiment 1 to the single technology control experiment 4.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
Example 1
A photo/bioelectrochemistry integrated module water body purification system device comprises a photo-catalytic system device and a bioelectrochemical processing unit, wherein the photo-catalytic system device comprises a solar photovoltaic cell 1, the bioelectrochemical processing unit comprises two groups of circuits consisting of a biological anode 4, a composite cathode 6 and an additional cathode 5, the composite cathode 6 and the additional cathode 5 are connected in parallel, the biological anode is made of a carbon material, the composite cathode takes the carbon material as a base material, cellulose carbon aerogel is synthesized in situ and modified, an iron-based oxide is loaded through coprecipitation, and graphene, iron oxide or molybdenum disulfide is loaded on the additional cathode as a catalyst.
In the embodiment, the light source is sunlight, the applied voltage is 0.2V, the anode electrode in the bioelectrochemical system is a graphite rod, and the cathode electrode is a graphite rod-based composite cathode. The biological anode, the composite cathode and the additional cathode are connected through an external circuit, a solar photovoltaic cell is utilized to adjust the applied voltage to be 0.2V, 0.2 mg/L of typical trace organic pollutants pyrene, dichlorobiphenyl and tetrabromobisphenol A are respectively added into a reaction system to be used as processing objects, under the action of sunlight, the synergistic coupling effect of the biological anode, the composite cathode and the additional cathode is utilized, and after 36 hours of reaction, sampling analysis is carried out.
The preparation method of the cathode electrode comprises the following steps:
(1) dispersing wood in a sodium hydroxide solution with the mass fraction of 10%, stirring for 4 hours at 60 ℃, filtering, adding a filtered sample into a sodium chlorite solution with the pH of 4, stirring for 4 hours at 60 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension;
(2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain micro/nano cellulose suspension with good dispersibility, and placing a graphite rod in the cellulose suspension, wherein the mass ratio of the graphite rod to the cellulose suspension is 1: 1;
(3) standing the cellulose suspension containing the graphite rod at 40 ℃ for 10 h to obtain cellulose hydrogel containing the graphite rod;
(4) drying the cellulose hydrogel containing the graphite rod by freeze drying at-40 ℃ for 36 h to form cellulose aerogel;
(5) cellulose aerogel containing graphite rods is placed in N2Carbonizing at 700 ℃ for 2 h under protection, and preparing conductive cellulose carbon aerogel in situ on a graphite rod, and marking as a cathode electrode material 1;
(6) by coprecipitation according to Fe2+：Fe3+Forming a mixed solution 1 with a molar ratio of 1:2 and a volume ratio of 2:1, and adding a precipitator NH into the mixed solution 13·H2O forms a mixed solution 2, the volume ratio of the precipitator to the mixed solution 1 is 1.5:1, the cathode electrode material 1 is added into the mixed solution 2, the mixed solution 2 is subjected to constant temperature water bath at 60 ℃ for 30 min, and the formed Fe is obtained after the reaction is finished3O4Separating, washing with distilled water to neutrality, vacuum drying at 60 deg.C for 2 hr to obtain Fe-loaded carrier3O4The composite cathode of (3);
(7) graphene is subjected to 100 Hz ultrasonic treatment by a coating method to form graphene suspension, the graphene suspension is uniformly coated on a graphite rod, and the graphite rod is dried at 80 ℃ to prepare the additional cathode.
The distance between the composite cathode and the additional cathode is 0.5 cm, the distance between the biological anode and the additional cathode is 2 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Based on the operating conditions in example 1: the light source is sunlight, the applied voltage is 0.2V, the anode electrode in the bioelectrochemical system is a graphite rod, and the composite cathode and the additional cathode are pure graphite rods without catalyst load. The distance between the composite cathode and the additional cathode is 0.5 cm, the distance between the biological anode and the additional cathode is 2 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Example 2
In this embodiment, the structure is as in embodiment 1, the light source is ultraviolet light, the applied voltage is 0.4V, the anode electrode in the bioelectrochemical system is carbon felt, and the cathode electrode is a carbon felt-based composite cathode. The biological anode, the composite cathode and the additional cathode are connected through an external circuit, a solar photovoltaic cell is utilized to adjust the applied voltage to be 0.4V, 0.2 mg/L of typical trace organic pollutants pyrene, dichlorobiphenyl and tetrabromobisphenol A are respectively added into a reaction system to be used as processing objects, under the action of ultraviolet light, the synergistic coupling effect of the biological anode, the composite cathode and the additional cathode is utilized, and after 36 hours of reaction, sampling analysis is carried out.
The preparation method of the cathode electrode comprises the following steps:
(1) dispersing bamboo wood in a sodium hydroxide solution with the mass fraction of 10%, stirring for 3 h at 70 ℃, filtering, adding a filtered sample into a sodium chlorite solution with the pH of 4.5, stirring for 3 h at 70 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension;
(2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain micro/nano cellulose suspension with good dispersibility, and placing a carbon felt into the cellulose suspension, wherein the mass ratio of the carbon felt to the cellulose suspension is 1: 3;
(3) standing the cellulose suspension containing the carbon felt at 60 ℃ for 7 h to obtain cellulose hydrogel containing the carbon felt;
(4) drying the cellulose hydrogel containing the carbon felt by freeze drying for 30 h at-60 ℃ to form cellulose aerogel;
(5) adding aerogel containing carbon felt cellulose in N2Carbonizing for 2 h at 800 ℃ under protection, and preparing conductive cellulose carbon aerogel in situ on a carbon felt, and marking as a cathode electrode material 1;
(6) by coprecipitation according to Fe2+：Fe3+Forming a mixed solution 1 with a molar ratio of 1:2 and a volume ratio of 2:1, and adding a precipitator NH into the mixed solution 13·H2O forms a mixed solution 2, the volume ratio of the precipitator to the mixed solution 1 is 1.5:1, the cathode electrode material 1 is added into the mixed solution 2, the mixed solution 2 is subjected to constant temperature water bath at 60 ℃ for 30 min, and the formed Fe is obtained after the reaction is finished3O4Separating, washing with distilled water to neutrality, vacuum drying at 60 deg.C for 2 hr to obtain Fe-loaded carrier3O4The composite cathode of (1).
(7) In the same step (6), the in-situ synthesis method is utilized to synthesize Fe on the carbon felt in situ3O4An additional cathode was prepared.
The distance between the composite cathode and the additional cathode is 1.0 cm, the distance between the biological anode and the additional cathode is 5 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Based on the operating conditions in example 2: the light source is ultraviolet light, the applied voltage is 0.4V, the anode electrode in the bioelectrochemical system is a carbon felt, and the composite cathode and the additional cathode are pure carbon felts without catalyst loading. The distance between the composite cathode and the additional cathode is 1.0 cm, the distance between the biological anode and the additional cathode is 5 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Example 3
In this embodiment, the structure is as in embodiment 1, the light source is artificial visible light, the applied voltage is 0.6V, the anode electrode in the bioelectrochemical system is a carbon brush, and the cathode electrode is a carbon brush-based composite cathode. The biological anode, the composite cathode and the additional cathode are connected through an external circuit, a solar photovoltaic cell is utilized to adjust the applied voltage to be 0.6V, 0.2 mg/L of typical trace organic pollutants pyrene, dichlorobiphenyl and tetrabromobisphenol A are respectively added into a reaction system to be used as processing objects, under the action of artificial visible light, the synergistic coupling effect of the biological anode, the composite cathode and the additional cathode is utilized, and after 36 hours of reaction, sampling analysis is carried out.
The preparation method of the cathode electrode comprises the following steps:
(1) dispersing bamboo wood in a sodium hydroxide solution with the mass fraction of 10%, stirring for 2 h at 80 ℃, filtering, adding a filtered sample into a sodium chlorite solution with the pH of 5, stirring for 2 h at 80 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension;
(2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain a micro/nano cellulose suspension with good dispersibility, and placing a carbon brush in the cellulose suspension, wherein the mass ratio of the carbon brush to the cellulose suspension is 1: 7;
(3) standing the cellulose suspension containing the carbon brush at 70 ℃ for 5 h to obtain cellulose hydrogel containing the carbon brush;
(4) drying the cellulose hydrogel containing the carbon brush by freeze drying at-70 ℃ for 27 h to form cellulose aerogel;
(5) carbonizing cellulose aerogel containing a carbon brush for 2 h at 900 ℃ under the protection of Ar, and preparing the conductive cellulose carbon aerogel on the carbon brush in situ, wherein the conductive cellulose carbon aerogel is marked as a cathode electrode material 1;
(6) by impregnation in accordance with Mn2+：Fe3+Mixing at a molar ratio of 1:2 and a volume ratio of 2:1 to form a mixed solution 1, adding carbonBrush-dipping in the mixed solution 1, stirring for 2 h in a water bath with constant temperature of 80 ℃, drying for 24 h at 105 ℃, and calcining the mixture for 2 h at 500 ℃ under the protection of nitrogen to obtain a Fe-Mn-loaded binary oxide composite cathode;
(7) molybdenum disulfide is subjected to ultrasonic treatment at 100 Hz to form a molybdenum disulfide suspension, and the molybdenum disulfide is loaded on a carbon brush by an impregnation method and is dried at 80 ℃ to prepare the additional cathode.
The distance between the composite cathode and the additional cathode is 1.5 cm, the distance between the biological anode and the additional cathode is 7 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Based on the operating conditions in example 3: the light source is artificial visible light, the applied voltage is 0.6V, the anode electrode in the bioelectrochemical system is a carbon brush, and the composite cathode and the additional cathode are pure carbon brushes without catalyst load. The distance between the composite cathode and the additional cathode is 1.5 cm, the distance between the biological anode and the additional cathode is 7 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Example 4
In the embodiment, the structure is as in embodiment 1, the light source is sunlight, the applied voltage is 0.8V, the anode electrode in the bioelectrochemical system is a carbon brush, and the cathode electrode is a graphite rod-based composite cathode. The biological anode, the composite cathode and the additional cathode are connected through an external circuit, a solar photovoltaic cell is utilized to adjust the applied voltage to be 0.4V, 0.2 mg/L of typical trace organic pollutants pyrene, dichlorobiphenyl and tetrabromobisphenol A are respectively added into a reaction system to be used as processing objects, under the action of sunlight, the synergistic coupling effect of the biological anode, the composite cathode and the additional cathode is utilized, and after 36 hours of reaction, sampling analysis is carried out.
The preparation method of the cathode electrode comprises the following steps:
(1) dispersing bamboo wood in a sodium hydroxide solution with the mass fraction of 10%, stirring for 2 h at 90 ℃, filtering, adding a filtered sample into a sodium chlorite solution with the pH of 4, stirring for 2 h at 90 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension;
(2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain micro/nano cellulose suspension with good dispersibility, and placing a graphite rod in the cellulose suspension, wherein the mass ratio of the graphite rod to the cellulose suspension is 1: 10;
(3) standing the cellulose suspension containing the graphite rod at 80 ℃ for 2 h to obtain cellulose hydrogel containing the graphite rod;
(4) drying the cellulose hydrogel containing the graphite rod by freeze drying at-80 ℃ for 24 h to form cellulose aerogel;
(5) carbonizing cellulose aerogel containing a graphite rod for 2 hours at 1000 ℃ under the protection of Ar, and preparing the conductive cellulose carbon aerogel on the graphite rod in situ, wherein the conductive cellulose carbon aerogel is marked as a cathode electrode material 1;
(6) by impregnation in accordance with Mn2+：Fe3+Forming a mixed solution 1 with a molar ratio of 1:2 and a volume ratio of 2:1, soaking a carbon brush in the mixed solution 1, stirring for 2 hours in a constant-temperature water bath at 80 ℃, drying for 24 hours at 105 ℃, and calcining the mixture for 2 hours at 500 ℃ under the protection of nitrogen to obtain a Fe-Mn-loaded binary oxide composite cathode;
(7) graphene is subjected to 100 Hz ultrasonic treatment by a coating method to form graphene suspension, the graphene suspension is uniformly coated on a graphite rod, and the graphite rod is dried at 80 ℃ to prepare the additional cathode.
The distance between the composite cathode and the additional cathode is 2.0 cm, the distance between the biological anode and the additional cathode is 10 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl, perfluorooctanoic acid and hexabromocyclododecane are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Based on the operating conditions in example 4: the light source is sunlight, the applied voltage is 0.8V, the anode electrode in the bioelectrochemical system is a carbon brush, and the composite cathode and the additional cathode are pure graphite rods without catalyst load. The distance between the composite cathode and the additional cathode is 2.0 cm, the distance between the biological anode and the additional cathode is 10 cm, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Single technique control experiment 1
With the same mass Fe in 4 examples3O4Fe-Mn binary oxide and H2O2Is a Fenton reagent, chemical oxidation reaction is carried out, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A are respectively taken as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Single technique control experiment 2
Taking the cellulose carbon aerogel with the same mass in the 4 embodiments as an adsorption material, carrying out physical adsorption reaction, and respectively taking typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Single technique control experiment 3
Ultraviolet light is used as a light source, and the same mass H is obtained in 4 embodiments2O2The catalyst is used as an oxidant to carry out photocatalytic oxidation reaction, and typical trace organic pollutants of 0.2 mg/L, namely pyrene, dichlorobiphenyl and tetrabromobisphenol A, are respectively used as treatment objects. After 36 h of reaction, a sample was taken for analysis and detection.
Single technique control experiment 4
The bioelectrochemical system was constructed in the same manner as the 4 examples with carbon brushes as the anode, cathode and additional cathode, wherein the anode was a bioanode, the cathode and additional cathode were free of catalyst, and bioelectrochemical reactions were carried out with typical trace organic pollutants pyrene, dichlorobiphenyl, tetrabromobisphenol a at 0.2 mg/L as treatment targets, respectively. After 36 h of reaction, a sample was taken for analysis and detection.
The degradation performance of the trace organic pollutant treatment system on typical trace organic pollutant pyrene under different conditions is shown in figure 3. The data in fig. 3 are for examples 1 to 4 and for control experiments 1 to 4. The data in fig. 4 are for single technology control experiment 1 to single technology control experiment 4.
The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent changes and substitutions without departing from the principle of the present invention after learning the content of the present invention, and these equivalent changes and substitutions should be considered as belonging to the protection scope of the present invention.
Claims (10)
1. Light/biological electrochemical integrated module water clean system device which characterized in that: the solar cell comprises a photocatalytic system device and a bioelectrochemical processing unit, wherein the photocatalytic system device comprises a solar photovoltaic cell (1), the bioelectrochemical processing unit comprises at least one group of circuits consisting of a biological anode (4), a composite cathode (6) and an additional cathode (5), the composite cathode (6) and the additional cathode (5) are connected in parallel, the biological anode is made of a carbon material, the composite cathode takes the carbon material as a base material, cellulose carbon aerogel is synthesized in situ and modified, an iron-based oxide is loaded through coprecipitation, and graphene, iron oxide or molybdenum disulfide is loaded on the additional cathode as a catalyst.
2. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the light source required in the photocatalytic system device comprises sunlight, ultraviolet light or artificial visible light.
3. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the low voltage range applied to the solar photovoltaic cell is 0.2V-0.8V.
4. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the carbon materials of the biological anode, the composite cathode and the additional cathode electrode in the bioelectrochemical processing unit comprise graphite rods, carbon felts or carbon brushes.
5. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the preparation steps of the composite cathode are as follows: (1) dispersing wood or bamboo raw materials into 10% sodium hydroxide solution by mass, stirring for 2-4 h at 60-90 ℃, and filtering; adding the filtered sample into a sodium chlorite solution with the pH of 4-5 and the concentration of 1 mol/L, stirring for 2-4 h at the temperature of 60-90 ℃, and washing with distilled water to be neutral to obtain a cellulose suspension; (2) carrying out 100 Hz ultrasonic treatment on the cellulose suspension to obtain a micro/nano cellulose suspension with good dispersibility, and placing a carbon material in the micro/nano cellulose suspension, wherein the mass ratio of the carbon material to the micro/nano cellulose suspension is 1 (1-10); (3) standing the cellulose suspension containing the carbon material prepared in the previous step at 40-80 ℃ for 2-10 h to obtain cellulose hydrogel containing the carbon material; (4) drying the cellulose hydrogel containing the carbon material at-40 to-80 ℃ for 24 to 36 hours by freeze drying to form cellulose aerogel; (5) carbonizing cellulose aerogel containing a carbon material for 2 h at the temperature of 700-; (6) and synthesizing the iron-based oxide on the cathode electrode material 1 in situ by using a coprecipitation method or an impregnation method, and finally preparing the composite cathode.
6. The integrated optical/bioelectrochemical module water purification system device according to claim 5, wherein: the iron-based oxide is Fe3O4Or Fe-Mn binary oxide.
7. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the preparation method of the additional cathode is a coating method, a dipping method or an in-situ synthesis method.
8. The integrated optical/bioelectrochemical module water purification system device according to claim 1, wherein: the distance between the composite cathode and the additional cathode is 0.5-2 cm, and the distance between the biological anode and the additional cathode is 2-10 cm.
9. Use of the integrated photo/bio-electrochemical module water purification system device of any one of claims 1 to 8 in the treatment of trace organic pollutants in water.
10. The use according to claim 9, characterized in that the trace organic contaminants are organic contaminants of a benzene ring structure which are pyrene, dichlorobiphenyl or tetrabromobisphenol a.
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