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Wastewater treatment method based on ta, al co-doped iron oxide photocatalyst

A technology for iron oxide light and wastewater treatment, applied in the field of photocatalysis, can solve the problems of high cost, catalyst doping with many precious metals, etc.

Inactive Publication Date: 2017-03-08
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the catalysts used are mostly doped with precious metals, the cost is high, and most of the catalysts are powders, only using their photocatalytic properties to treat wastewater

Method used

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  • Wastewater treatment method based on ta, al co-doped iron oxide photocatalyst
  • Wastewater treatment method based on ta, al co-doped iron oxide photocatalyst
  • Wastewater treatment method based on ta, al co-doped iron oxide photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The wastewater to be treated in this embodiment is mixed wastewater containing Cr(VI) and phenol, wherein the initial concentration of phenol is 10 mg / l, and the initial concentration of Cr(VI) is 10 mg / l.

[0064] The wastewater treatment method based on the Ta, Al co-doped iron oxide photocatalyst of the present embodiment, the treatment process is as follows:

[0065] S1: Adjust the pH value of the wastewater to be treated to 3; the method for adjusting the pH is as follows:

[0066] by dropwise addition of 1M H 2 SO 4 solution or 1M NaOH solution to adjust the pH value of the simulated wastewater.

[0067] S2: After the pH value is adjusted, the photocatalytic treatment is carried out. The photopositive electrode in the photocatalytic electrode pair used in the photocatalytic treatment includes a conductive substrate and a Ta and Al co-doped iron oxide photocatalyst film coated on the surface of the conductive substrate. , the cathode is a titanium sheet.

[006...

Embodiment 2

[0085] The same treatment method as in Example 1 is used to treat different waste water, that is, the photoanode electrode, the treatment process and the parameters of each step are the same when carrying out waste water treatment. The difference is that in the waste water to be treated, Cr(VI) and The initial concentration of phenol was varied.

[0086] The initial concentrations of Cr(VI) and phenol in the waste water to be treated in the present embodiment are as follows:

[0087] The initial concentration of Cr(VI) was 10 mg / l, and the concentration of phenol was 10 mg / l, 20 mg / l, 30 mg / l, and 40 mg / l, respectively.

[0088] figure 2 For wastewater treatment based on Ta and Al co-doped iron oxide photocatalysts, the synergistic degradation of the wastewater to be treated is respectively under the condition of different phenol concentrations.

[0089] Depend on figure 2 It can be seen that increasing the phenol concentration from 10mg / l to 30mg / l will promote the degra...

Embodiment 3

[0091] Same as Example 1, the difference is that the processing conditions are different. In this embodiment, it is carried out under the conditions of pure electricity and pure light respectively.

[0092] Research on Ta / Al-Fe 2 o 3 Synergistic degradation of Cr(VI) and phenol by catalytic film under different light conditions.

[0093] Figure 3a and Figure 3b are the degradation rates of Cr(VI) and phenol in the wastewater to be treated under pure electric conditions (EC), pure light conditions (PC) and photoelectric synergistic conditions (PEC), where the corresponding The curve is the same as in Example 1.

[0094] Depend on Figure 3a It can be seen that the degradation effect of Cr(VI) under the condition of photoelectric synergy is significantly better than that of pure light and pure electricity. Due to Fe 2 o 3 Thin films are visible light-based catalysts, which are better under pure light than pure electricity conditions. Depend on Figure 3b It can be s...

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Abstract

The invention discloses a wastewater processing method based on a Ta / Al co-doped iron oxide photocatalyst, wherein the wastewater contains Cr and phenol. The method comprises the following steps: step one, adjusting the pH value of the wastewater to be processed; step two, carrying out a photoelectrical catalysis on wastewater, wherein in the photoelectrical catalysis process, the positive electrode comprises a conductive substrate and a Ta / Al co-doped iron oxide photocatalyst film covered on the surface of the conductive substrate, and the negative electrode is a titanium sheet. The processing technology is simple, the Ta / Al-Fe2O3 photocatalyst film has the advantages of excellent visible light catalytic activity, good electrical catalytic performance, and high stability, the wastewater degradation efficiency is greatly improved based on the photo-electric synergetic degrading effect, and the method has a practical meaning in the sewage treatment field.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a wastewater treatment method based on a Ta and Al co-doped iron oxide photocatalyst. Background technique [0002] Environmental pollution and energy shortage are major challenges facing mankind. In recent years, the treatment of refractory wastewater has always been the focus and difficulty of environmental pollution control. Its typical representatives are inorganic wastewater containing heavy metals and refractory organic wastewater, among which phenolic wastewater and chromium-containing wastewater are the worst. At present, the main method is to oxidize phenols into quinones, reduce the more toxic positive hexavalent Cr (ie Cr(VI)) to the less toxic positive trivalent Cr (ie Cr(III)), to achieve difficult Degradation for the purpose of wastewater treatment. [0003] Photoelectrocatalytic technology has come into people's sight because of its high efficiency, harmle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08
CPCY02W10/37
Inventor 丛燕青王娟姬云葛耀花张轶王齐
Owner ZHEJIANG GONGSHANG UNIVERSITY