Novel ternary composite visible-light-induced photocatalyst for efficiently and stably treating hexavalent chromium wastewater and synthesis method thereof

A ternary composite, synthetic method technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve the separation efficiency and transmission rate of photogenerated electrons and holes Increase, the photocatalytic performance is not enough, etc., to achieve the effect of low cost, abundant and easily available raw materials, and high visible light catalytic activity

Active Publication Date: 2020-11-10
YANGZHOU UNIV
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Problems solved by technology

However, currently for g-C 3 N 4 The compound modification of the present invention mainly focuses on the binary heterojunction, which can only realize photogenerated electrons or photogenerated holes from g-C 3 N 4 Therefore, the separation efficiency and transport rate of photogenerated electrons and holes are limited, and the photocatalytic performance is not high enough.

Method used

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  • Novel ternary composite visible-light-induced photocatalyst for efficiently and stably treating hexavalent chromium wastewater and synthesis method thereof
  • Novel ternary composite visible-light-induced photocatalyst for efficiently and stably treating hexavalent chromium wastewater and synthesis method thereof
  • Novel ternary composite visible-light-induced photocatalyst for efficiently and stably treating hexavalent chromium wastewater and synthesis method thereof

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Experimental program
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Embodiment 1

[0040] 1. Graphene / g-C 3 N 4 / Synthesis of Polyaniline Ternary Complex:

[0041] 1) g-C 3 N 4 Synthesis of melamine: Heat 3g of melamine from room temperature to 580°C at a heating rate of 2.8°C / min, keep it at 580°C for 5h, and then cool it down to room temperature naturally.

[0042] 2) Polyaniline / g-C 3 N 4 Synthesis of binary complexes: Weigh 50 mg of polyaniline powder and dissolve it in 25 ml of N,N-dimethylformamide, and add 1 g of the prepared g-C 3 N 4 , and then sonicated for 1h and magnetically stirred for 2h to disperse evenly, and then heated and evaporated to dryness of N,N-dimethylformamide solvent at 145°C.

[0043] 3) Graphene / g-C 3 N 4 / Synthesis of Polyaniline Ternary Complex:

[0044] 1g polyaniline / g-C 3 N 4 The binary composite, 10mg single-layer graphene oxide and 250mg ascorbic acid were mixed in 40ml deionized water, and then the mixture was sealed in a 50ml polytetrafluoroethylene-lined stainless steel high-pressure axe, hydrothermally t...

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Abstract

The invention discloses a ternary composite visible-light-induced photocatalyst and a synthesis method thereof. The synthesis method comprises the following steps: firstly, preparing g-C3N4 by adopting a melamine calcining method; then mixing the g-C3N4 with an N,N-dimethylformamide solution of polyaniline, and carrying out ultrasonic treatment, stirring and solvent evaporation to prepare a polyaniline/g-C3N4 binary compound; and mixing the polyaniline/g-C3N4 binary compound, single-layer graphene oxide and ascorbic acid in deionized water, and carrying out hydrothermal treatment on the mixture to obtain the graphene/g-C3N4/polyaniline ternary compound. The method is simple and easy to implement, the raw materials are rich and easy to obtain, metal and metal compounds are not used, the cost is low, and the obtained graphene/g-C3N4/polyaniline ternary compound not only has high visible light catalytic activity on reduction of hexavalent chromium in a decorative chromium plating solution, but also has good photocatalytic stability and reusability, and can be used as a novel visible-light-induced photocatalyst to be applied to efficient and stable treatment of hexavalent chromium wastewater.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst materials, in particular to a visible light catalyst (graphene / g-C 3 N 4 / polyaniline ternary compound) and its synthesis method. Background technique [0002] Chromium and its compounds are important raw materials in many industries. According to statistics, more than 10% of commodity varieties in my country are related to chromium and its compounds. However, the production and use of chromium and its compounds also produce a large amount of waste water containing hexavalent chromium. Due to its high toxicity, high water solubility and strong mobility, hexavalent chromium has been included in the blacklist of priority pollutants in China. In contrast, trivalent chromium is not only less toxic, but also prone to precipitation Therefore, the common treatment method for Cr(VI) in water is to reduce it to trivalent chromium. However, the conventional chemical reduction method consumes a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C02F1/30C02F101/22
CPCB01J35/004B01J31/069C02F1/30C02F2305/10C02F2101/22
Inventor 张永才葛婷张芬
Owner YANGZHOU UNIV
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