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Method for treating wastewater and by-producing hydrogen by activating sulfate with photoanode

A technology for treating wastewater and sulfate, applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc., can solve the problems of high cost and limitations, and achieve the effect of mild conditions, simple equipment and simple process

Inactive Publication Date: 2019-01-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, sulfate radicals are generated by adding persulfates such as persulfate (PMS), but the high cost of these persulfates limits the further application of this technology

Method used

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  • Method for treating wastewater and by-producing hydrogen by activating sulfate with photoanode
  • Method for treating wastewater and by-producing hydrogen by activating sulfate with photoanode
  • Method for treating wastewater and by-producing hydrogen by activating sulfate with photoanode

Examples

Experimental program
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Embodiment 1

[0038] Bismuth vanadate materials were prepared as follows:

[0039] 0.9g Bi(NO 3 ) 3 ·H 2 O was dissolved in 100 mL of 0.4 M KI solution, and the pH of the solution was adjusted to 1.7 with dilute nitric acid to obtain A solution. 20 mL of absolute ethanol dissolved with 0.23 M p-benzoquinone was added to the solution A under vigorous stirring to obtain a tan solution. Chenhua CHI660 electrochemical workstation was used for constant potential deposition. The above solution was used as the electrolyte, FTO conductive glass was used as the working electrode, Ag / AgCl was used as the reference electrode, and Pt was used as the counter electrode. Using this three-electrode system, FTO conductive glass was used. Potentiostatic deposition. The vanadium precursor solution is placed on the electrode and annealed at a high temperature to obtain a bismuth vanadate material. Soak the obtained bismuth vanadate material in NaOH solution to remove excess oxides on the surface to obtain...

Embodiment 2

[0046] The Pt in Example 1 was replaced by FeNiP-NF as the photocathode, and the photoelectrocatalytic degradation treatment of rhodamine B dye in industrial wastewater was carried out.

[0047] Figure 4 It is the test chart of photoelectrocatalytic degradation of rhodamine B dye under different photocathodes in embodiment 1 and embodiment 2. Depend on Figure 4 It can be seen that the direct photolysis efficiency of rhodamine B dyes only differs by 5% when Pt and FeNiP-NF are used as cathodes respectively, and FeNiP-NF is preferred because of the lower cost of FeNiP-NF.

[0048] From Example 1 and Example 2, it can be seen that using the bismuth vanadate material as the photoanode, using the common sulfate in wastewater as the precursor of sulfate radicals, and adopting the method of photoelectrically activating sulfate, the effect on wastewater degradation is remarkable , the reaction condition is mild, without the need to strengthen the oxidant PMS, it can achieve excell...

Embodiment 3

[0054] A method of using photoanode to activate sulfate to treat waste water and produce hydrogen by-product, the method is: use bismuth vanadate material as photoanode, form a photoelectrocatalytic degradation system together with cathode material and xenon lamp, and treat the Wastewater is degraded by photoelectrocatalysis. Wastewater contains sulfate, the concentration of sulfate is 0.05mol / L; the concentration of pollutants is 50mg / L.

[0055] Wherein, the preparation method of bismuth vanadate material comprises the following steps:

[0056] 1) adding bismuth nitrate to the potassium iodide solution, and then adding an ethanol solution of p-benzoquinone to obtain an electrolyte;

[0057] 2) Using FTO conductive glass as a working electrode, Ag / AgCl as a reference electrode, and Pt as a counter electrode, FTO conductive glass is subjected to constant potential deposition to obtain electrode materials;

[0058] 3) Place the vanadium precursor solution (vanadium acetylacet...

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Abstract

The invention relates to a method for treating wastewater and by-producing hydrogen by activating sulfate with a photoanode. The method comprises the steps as follows: a bismuth vanadate material is used as the photoanode and form a photoelectrocatalytic degradation system with a cathode material and a xenon lamp, wastewater in a photoelectrocatalysis reactor is subjected to photoelectrocatalyticdegradation, and sulfate is contained in the wastewater. Compared with the prior art, the method has the advantages that the bismuth vanadate material is used as the photoanode to produce an active oxidizing substance and matched with the cathode material to activate sulfate in the wastewater, sulfate radicals are produced to intensify the efficiency of photoelectrocatalytic degradation of pollutants in the wastewater, meanwhile, cathode electrolysis water is reduced to produce hydrogen, the hydrogen production performance is improved, and the method is convenient to operate and high in efficiency; the sulfate radicals are directly produced from the wastewater containing sulfate without addition of a PMS strong oxidizer, and the synergistic catalysis performance with hydroxyl radicals is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a method for treating waste water by using photoanode to activate sulfate and producing hydrogen by-product. Background technique [0002] Bismuth vanadate (BiVO 4 ) is an important P-type semiconductor material. Because of its narrow band gap and wide wavelength response range, it can be used as a photocatalyst for photocatalytic hydrogen production and removal of refractory toxic organic pollutants in wastewater. However, the photogenerated electron and hole pairs of bismuth vanadate are difficult to migrate and separate, and the surface adsorption performance is poor, which leads to serious constraints on its photocatalytic performance. [0003] In the field of wastewater treatment, the traditional advanced oxidation technology is to generate hydroxyl radicals as active substances to degrade pollutants, and the advanced oxidation technology based on sulfate radica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/461C02F1/72C25B11/06C25B1/04C02F101/30
CPCC02F1/30C02F1/4672C02F1/725C02F2101/30C02F2305/023C02F2305/10C25B1/04C25B1/55C25B11/075Y02E60/36
Inventor 时鹏辉严瑾杨玲霞岑菁范金辰闵宇霖徐群杰
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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