Treatment process for degrading printing and dyeing wastewater through bismuth-based composite photocatalyst

A printing and dyeing wastewater and treatment process technology, which is applied in textile industry wastewater treatment, special compound water treatment, light water/sewage treatment, etc., can solve the problems of limited solid powder catalyst application, short lifetime of photogenerated electron-hole pairs, and low photoconversion efficiency and other issues, to achieve the effects of being beneficial to the sustainable development of the environment and energy, promoting light absorption, and simple preparation methods

Inactive Publication Date: 2018-06-12
李雪琴
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But semiconductor TiO 2 The material also has some serious drawbacks, such as pure TiO 2 The short lifetime of photogenerated electron-hole pairs of photocatalysts, narrow light absorption range and low photoconversion efficiency limit the application of solid powder catalysts.

Method used

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  • Treatment process for degrading printing and dyeing wastewater through bismuth-based composite photocatalyst

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Embodiment 1

[0027] One, the preparation of graphene oxide:

[0028] In the mixed solution of 350mg graphite powder and 2.4g sodium nitrate, add 21mL of 98wt% concentrated sulfuric acid, stir at a temperature of <5°C, let it react in a beaker for 1.8h; grind potassium permanganate into powder, then Within 0.5h, add 2.0g of powder to the beaker, and react at <5°C for 1.8h; put the beaker in a constant temperature box to raise the temperature to 48°C, and then keep the temperature for 2.2h. After the constant temperature is over, add 45mL of deionized water to the beaker , and then raise the temperature to 85°C, keep the temperature for 15min; then cool the solution in the beaker to room temperature, add 80mL deionized water to dilute, the solution turns bright yellow, then add 13mL 35wt% hydrogen peroxide solution; then carry out Filter, wash the filter residue with 400mL of 5wt% hydrochloric acid, dry it with an air pump and repeat the washing 3 times, then wash it with deionized water 3 t...

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Abstract

The invention discloses a treatment process for degrading printing and dyeing wastewater through photocatalysis. An adopted photocatalyst is a bismuth nanocluster-bismuth nanoparticle / TiO2 / graphene composite photocatalyst. According to the catalyst, oxidized graphene is firstly prepared, then TiO2 with photocatalytic activity is loaded on a slice layer of the oxidized graphene, a bismuth nanocluster is modified onto a graphene slice layer of TiO2, and photo-reduction is carried out. The composite photocatalyst has high catalytic degradation activity aiming at the printing and dyeing wastewater. The treatment process provided by the invention solves the problem of low degrading efficiency of the printing and dyeing wastewater in the prior art, and is applicable to degrading organic dyes inthe printing and dyeing wastewater.

Description

technical field [0001] The invention relates to a treatment process for photocatalytic degradation of printing and dyeing wastewater, using bismuth nanoclusters-bismuth nanoparticles / TiO 2 / graphene composite photocatalyst, the composition and special structure of the photocatalyst enable it to have high-efficiency photocatalytic degradation activity, and the treatment process has the advantages of simple operation, low cost, and high degradation efficiency. Background technique [0002] In the process of textile printing and dyeing, a large number of auxiliaries that pollute the environment and are harmful to the human body are used. Most of these auxiliaries are discharged in the form of liquid, which inevitably enters the water environment and causes water pollution. For example, Rhodamine B dyes are carcinogenic and mutagenic. Wastewater containing Rhodamine B has deep chroma, high content of organic pollutants, and poor biodegradability. It is difficult to treat with co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30C02F101/30C02F103/30
CPCC02F1/30B01J21/18B01J23/18C02F2103/30C02F2305/10C02F2101/308B01J35/391B01J35/396B01J35/393B01J35/39B01J35/33
Inventor 李雪琴
Owner 李雪琴
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