A method and system for treating waste water polluted by complex pollutants
A pollutant and system technology, applied in water/sludge/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problem of low cathode electron selectivity, low utilization rate, and external bias Increase energy consumption and other issues to achieve the effect of good versatility and practicability
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[0056] A method for preparing a self-biased double photoelectrode system photocatalytic electrode, comprising the steps of:
[0057] (1) 0.324g Bi(NO 3 ) 3 ·5H 2 O powder dissolved in 1ml 70% concentrated HNO 3 , add 2ml deionized water and stir evenly, and then add 0.078g NH 4 VO 3 and 0.167g of polyvinyl alcohol (99%, PVA) were dissolved therein, and ultrasonicated for 1h to obtain solution A. Finally, apply solution A on the conductive surface of FTO, 20 μm each time, and smear three times. After completion, vacuum dry at 70 ° C for 1 h, put it in a muffle furnace and calcinate at 450 ° C for 2 h to obtain BiVO 4 Substrate: The selected FTO conductive glass has a specification of 2×5cm, a thickness of 2.2mm, a resistance of 7 ohms, and a light transmittance of 80%.
[0058] Dissolve 1.5mmol 2-aminoterephthalic acid in 15ml dimethylformamide solution to obtain solution B; add 0.5mmol butyl titanate dropwise to 15ml methanol solution to obtain solution C; add solution B...
Embodiment 1
[0067] In order to investigate the photoresponse effect of the photoanode, BiVO was first prepared separately on the FTO conductive glass. 4 , NH 2 MIL125 and BiVO 4 / HN 2MIL125 photoanode. It was determined that material incorporation has a significant effect on enhancing the photoresponse of the photoanode.
[0068] Secondly, BiVO containing 4 different preparation ratios was selected 4 / NH 2 MIL125 photocatalytic anode, through the comparison of its photocurrent performance, to determine the photocatalytic anode with strong photoresponse. The preparation method is as follows. Dissolve 0.75mmol, 1.5mmol, 2.25mmol, and 3mmol of 2-aminoterephthalic acid in 15ml of dimethylformamide solution to obtain solution B1, solution B2, solution B3, and solution B4 respectively. Add 0.25mmol, 0.5mmol, 0.75mmol, and 1mmol of butyl titanate to 15ml of methanol solution to obtain solution C1, solution C2, solution C3, and solution C4, respectively. Mix the two solutions (according to...
Embodiment 2
[0071] In order to investigate the electrical response performance of the photocathode, a 0.1mol / L KH 2 PO 4 The solution was 100ml, and the pH was adjusted to 7 with KOH. The NiO / nickel foam photocathode was used as the working electrode, and the open circuit voltage was measured under the conditions of Pt as the counter electrode and Ag / AgCl as the reference electrode.
[0072] Depend on Figure 9 It can be found that the NiO cathode has a very large open circuit voltage, and the photoanode can generate a strong current.
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