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Preparing method for flower-ball-shaped manganese dioxide/graphene/bismuth oxyiodide composite photocatalyst material

A technology of composite photocatalysis and manganese dioxide, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. Narrow width and other issues, to achieve the effect of improving photocatalytic efficiency, improving utilization rate, and high photocatalytic performance

Inactive Publication Date: 2019-04-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention will solve the technical problem that simple manganese dioxide and bismuth iodine oxide have a narrow band gap and fast recombination rate of photogenerated carriers, resulting in poor photocatalytic degradation performance, and provide a flower-shaped manganese dioxide / graphene / iodine Preparation method of bismuth oxide composite photocatalytic material

Method used

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  • Preparing method for flower-ball-shaped manganese dioxide/graphene/bismuth oxyiodide composite photocatalyst material
  • Preparing method for flower-ball-shaped manganese dioxide/graphene/bismuth oxyiodide composite photocatalyst material
  • Preparing method for flower-ball-shaped manganese dioxide/graphene/bismuth oxyiodide composite photocatalyst material

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specific Embodiment approach 1

[0027] Specific embodiment one: the preparation method of a kind of spherical manganese dioxide / graphene / bismuth oxyiodide composite photocatalyst material of this embodiment, specifically carries out according to the following steps:

[0028] 1. At room temperature, add a mixed acid solution of sulfuric acid and phosphoric acid to the flake graphite, mix evenly, use ice-water bath method to cool down to 0°C, then add potassium permanganate, stir and mix evenly, heat to 30-40°C, react 4 to 6 hours to obtain the mixed solution, then add deionized water and hydrogen peroxide solution in sequence, when the mixed solution turns from brown to yellowish brown, use hydrochloric acid solution and deionized water to wash repeatedly in the centrifuge, and then dry to obtain graphite oxide solid powder;

[0029] 2. Ultrasonic disperse the graphite oxide solid powder obtained in step 1 into deionized water, add potassium permanganate and manganese sulfate monohydrate, and then transfer it...

specific Embodiment approach 2

[0031] Embodiment two: this embodiment is different from embodiment one: the volume ratio of sulfuric acid and phosphoric acid in the mixed acid solution of sulfuric acid and phosphoric acid in step one is 1: (3~4). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific embodiment three: this embodiment is different from specific embodiment one or two: the mass ratio of flake graphite and potassium permanganate is 1: (3~4) in the step one. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparing method for a flower-ball-shaped manganese dioxide / graphene / bismuth oxyiodide composite photocatalyst material, and relates to the field of photocatalytic compositematerials. The technical problem that as the forbidden bandwidth of only manganese dioxide and bismuth oxyiodide is narrow, and the recombination rate of a photon-generated carrier is high, photocatalytic degradation performance is poor is solved. The preparing method includes the steps that 1, graphite oxide solid powder is prepared; 2, flower-ball-shaped manganese dioxide grow on the surface ofgraphene oxide with a hydrothermal method; 3, nano-particle bismuth oxyiodide is deposed with a chemical deposition method. According to the preparing method, the flower-ball-shaped manganese dioxide / graphene / bismuth oxyiodide ternary complex is synthesized for the first time, heterojunction is formed between the bismuth oxyiodide and manganese dioxide, transferring of photo-induced electrons andholes is facilitated under the illumination condition, and the using rate of the photo-induced electrons is increased; meanwhile, the photo-induced electrons and the holes are compounded with graphene, the adsorption rate of the composite material can be increased, the photo-induced electrons can be rapidly transferred, and the photocatalysis efficiency of the material is improved. The preparing method is used for preparing the composite photocatalyst material.

Description

technical field [0001] The invention relates to the field of photocatalytic composite materials. Background technique [0002] Semiconductor photocatalysis technology has important application prospects in the environmental field. The technical principle is that the semiconductor photocatalyst absorbs photons with energy greater than its band gap width, generates photo-generated electrons and holes, and the photo-generated electrons jump to the conduction band and reduce dissolved oxygen in water to superoxide radicals (.O 2 - ). At the same time, the holes on the valence band oxidize water to hydroxyl radicals (·OH) to oxidize organic pollutants or directly oxidize organic pollutants. [0003] At present, the commonly used semiconductor materials mainly include TiO 2 , ZnO, SnO 2 , CdS, etc. However, in the field of photocatalysis, these traditional photocatalysts only have good photocatalytic activity in the ultraviolet region due to their wide bandgap width, and ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/30
CPCC02F1/30B01J27/06C02F2101/308B01J35/39
Inventor 张立珠周庆洁
Owner HARBIN INST OF TECH