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Photocatalyst for sewage treatment and preparation method thereof

A photocatalyst and sewage treatment technology, which is applied in the direction of light water/sewage treatment, water/sludge/sewage treatment, physical/chemical process catalyst, etc., can solve the problem of weak surface adsorption capacity, low catalytic efficiency, photogenerated electrons and photogenerated space Holes are difficult to separate, etc.

Inactive Publication Date: 2016-09-28
蔺爱国 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although BiVO 4 The catalyst has high photocatalytic activity, but as a single narrow-bandgap semiconductor, it has defects such as weak surface adsorption capacity, difficulty in separating photogenerated electrons and photogenerated holes, and the recombination rate of photogenerated electrons and holes on the surface is relatively fast. , so that the photogenerated electrons and holes have no time to form enough OH, which reduces the photon quantum efficiency, which leads to a rapid decrease in the degradation performance of the catalyst and a low catalytic efficiency.

Method used

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preparation example Construction

[0019] Correspondingly, the present invention also provides a method for preparing a photocatalyst for sewage treatment, which adopts the method of co-precipitation and combined hydrothermal treatment, comprising the following steps: dissolving tetraethylenepentamine and copper source compound in deionized water, Stir at a speed of 400-800rpm to form a copper ammonium complex, Cu 2+ The concentration is 0.05~0.3mol / L; dissolving tungsten source compound and oxalic acid in deionized water, stirring at a speed of 300~500rpm to obtain the first mixed solution; adding the first mixed solution dropwise to the copper ammonium In the complex compound, the second mixed solution is obtained; the vanadium source compound, the bismuth source compound and the template are added to the second mixed solution, stirred at a speed of 300-500 rpm, and tetraethylenepentamine is added to adjust the pH value to 8- 10. Obtain a third mixed solution after aging treatment; place the third mixed solut...

Embodiment 1

[0034] 1) Dissolve 2.65g of tetraethylenepentamine and 2.23g of copper sulfate pentahydrate in 200mL of deionized water according to a molar ratio of 1:1, and stir at 800rpm for 20min at room temperature to form a copper ammonium complex ;

[0035] 2) Dissolve 3.55g of ammonium tungstate and oxalic acid in 30mL of deionized water, and stir at 400rpm for 20min at room temperature to make them fully mixed;

[0036] 3) adding the mixed solution formed in step 2) dropwise to the copper ammonium complex prepared in step 1) within 20 min;

[0037] 4) Add 1.64g ammonium metavanadate, 6.79g bismuth nitrate and 0.14g 1-ethyl-3-methylimidazolium hexafluorophosphate to the above mixed solution and continue to stir at 300rpm for 40min to form a mixed solution, add Tetraethylenepentamine adjusted its pH value at 8, and aged at room temperature for 2h;

[0038] 5) Transfer the mixed solution obtained in step 4) to a hydrothermal reactor for treatment at 180° C. for 6 hours, and then natur...

Embodiment 2

[0042] 3) Dissolve 1.33g of tetraethylenepentamine and 2.64g of copper nitrate in 300mL of deionized water according to a molar ratio of 1:2, and stir at 400rpm for 40min at room temperature to form a copper ammonium complex;

[0043] 4) Dissolve 3.99g of ammonium paratungstate and oxalic acid in 50mL of deionized water, and stir at 450rpm for 20min at room temperature to make them fully mixed;

[0044] 3) adding the mixed solution formed in step 2) dropwise to the copper ammonium complex prepared in step 1) within 40 min;

[0045] 4) Add 1.64g ammonium metavanadate, 5.43g bismuth bismuth acetate and 0.4g 1-ethyl-3-methylimidazolium tetrafluoroborate to the above mixed solution and continue to stir at 500rpm for 30min to form a mixed solution, and add to the mixed solution Add tetraethylenepentamine to adjust its pH value at 10, and aging at room temperature for 1h;

[0046] 5) Transfer the mixed solution obtained in step 4) to a hydrothermal reactor for treatment at 120° C. ...

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Abstract

The invention provides a photocatalyst for sewage treatment and a preparation method thereof. Copper tungstate and bismuth vanadate are compounded so as to be conducive to the transition of photogenerated electrons, improve the separation efficiency, avoid recombination, and then improve the catalytic efficiency; secondly, with use of the alkalinity of tetraethylenepentamine and complexation properties with different metals, raw materials are fully mixed to form a precipitate, so that an active component is dispersed uniformly, and the defect that an active component in a conventional precipitation agent is not dispersed uniformly is overcome; and thirdly, a catalyst is post-treated by a hydrothermal treatment method, so that the active component is beneficial to form a corresponding solid solution, the synergistic catalysis effect is fully exerted, and the reaction activity of the catalyst is effectively improved. Experimental results show that the prepared photocatalyst for sewage treatment has relatively high catalytic efficiency.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a photocatalyst for sewage treatment and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the consumption of fossil energy is increasing day by day, and the environmental pollution is becoming more and more serious nationwide, especially the existence of toxic organic pollutants in water, which not only causes environmental pollution and ecological damage, but also seriously endangers human health. The traditional methods of treating water pollution mainly include physical adsorption, chemical oxidation decomposition, microbial degradation, etc. Although the above methods can achieve certain treatment effects on pollutants, there are also inevitable defects, such as: while decomposing pollutants It is easy to cause secondary pollution, and it is impossible to completely convert organic matter into non-toxic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888C02F1/30
CPCC02F1/30B01J23/002B01J23/888B01J2523/00C02F2101/308C02F2305/10B01J35/39B01J2523/17B01J2523/54B01J2523/55B01J2523/69Y02W10/37
Inventor 魏亮
Owner 蔺爱国