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Preparation method of efficient and stable Fe (III)/AgBr composite visible photocatalyst

A photocatalyst and visible light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of low equipment requirements, high visible light photocatalytic performance, and good social and economic benefits

Inactive Publication Date: 2013-04-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, to the best of our knowledge, there have been no reports on the surface modification of silver halide photocatalysts using transition metal elements such as Fe(III) to enhance the photostability and photocatalytic activity of silver halide photocatalysts.

Method used

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  • Preparation method of efficient and stable Fe (III)/AgBr composite visible photocatalyst
  • Preparation method of efficient and stable Fe (III)/AgBr composite visible photocatalyst
  • Preparation method of efficient and stable Fe (III)/AgBr composite visible photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation process of Fe(III) / AgBr composite visible light photocatalyst is as follows: 1) Preparation of AgBr particles: 5.3 mL 0.01 mol / L silver nitrate solution was added to 5.3 mL 0.01 mol / L sodium bromide solution, at 60 o C for 2 h, and then washed the yellow precipitate with deionized water for 3 times, after 60 o C. Dry in vacuum for 2 h to obtain AgBr particles with a size of 1-3 mm; 2) Fe(III) modification on the surface of AgBr particles: Take 0.1 g of AgBr particles and add them to 15 mL of 0.005 mol / L ferric nitrate solution, shake After uniformity, at 60 o C water bath was incubated for 2 h, the precipitate in the obtained reaction solution was filtered, washed with deionized water three times, and finally vacuum-dried at 60 °C for 2 h to obtain a highly efficient and stable Fe(III) / AgBr composite visible light photocatalyst.

[0030] The microstructure characterization method of Fe(III) / AgBr composite visible light photocatalyst: the morphology and ...

Embodiment 2

[0039] In order to examine the effect of ferric nitrate concentration on the photocatalytic performance of Fe(III) / AgBr composite visible light photocatalyst, in addition to the different concentration of ferric nitrate, other reaction conditions such as water bath temperature (60°C), water bath time (2 h), drying temperature ( 60°C) and drying time (2 h) were the same as in Example 1. The results showed that when the concentration of ferric nitrate was 0.0001, 0.001, 0.005, 0.01 and 0.05, the degradation rate constants of Fe(III) / AgBr composite visible light photocatalyst for methyl orange were 0.065, 0.091, 0.113, 0.075 and 0.056, respectively. min -1 . The main reason is that when the concentration of Fe(III) is 0.0001 mol / L, because the concentration of Fe(III) is too low, only a small amount of Fe(III) is compounded on the surface of AgBr particles, making the photocatalytic performance of Fe(III) / AgBr lower; when the concentration of Fe(III) is 0.001-0.01 mol / L, becaus...

Embodiment 3

[0041] In order to test the effect of water bath temperature on the photocatalytic performance of Fe(III) / AgBr composite visible light photocatalyst, in addition to different water bath temperatures, other reaction conditions such as ferric nitrate concentration (0.005 mol / L), water bath time (2 h), drying temperature (60°C), drying time (2 h), etc. are all the same as in Example 1. The results showed that when the water bath temperature was 30, 60, 80 and 100 ℃, the degradation rate constants of the obtained Fe(III) / AgBr composite visible light photocatalyst to methyl orange were 0.105, 0.113, 0.094 and 0.062 min, respectively -1 . The main reason is that when the temperature of the water bath is 30-80°C, Fe(III) can be well combined with AgBr particles to form a Fe(III) / AgBr composite structure, and the higher temperature (100°C) is easy to make the ferric nitrate solution Hydrolysis to form Fe(OH) 3 Colloids are not conducive to the formation of Fe(III) / AgBr composite str...

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Abstract

The invention relates to a preparation method of an efficient and stable Fe (III) / AgBr composite visible photocatalyst. The preparation method comprises the following steps of: 1) synthesizing AgBr particles through ion precipitation reaction; 2) dissolving ferric nitrate in deionized water to form a uniform solution; 3) adding the AgBr particles in the ferric nitrate solution and thermally insulating in water bath; and 4) taking out the reaction solution obtained in step 3), filtering out and washing precipitate, and vacuum-drying to obtain the Fe (III) / AgBr composite visible photocatalyst. The preparation method is very simple in operation, so that various organic surfactants, additives and the like are not needed to be added; at the same time, only a beaker and the like common glass apparatus are needed in a whole reaction process, so that the equipment requirement is low; and expensive various processing synthesis equipments and high temperature and high pressure and the like reaction device are not needed, so that the preparation method has the advantage of being easy to synthesize in large volumes. The prepared photocatalyst has high visible photocatalytic performance, so that the photocatalyst is hopeful to generate good social and economic benefits.

Description

technical field [0001] The invention relates to the surface modification of AgBr particles and the preparation method of Fe(III) / AgBr composite visible light photocatalyst. technical background [0002] In recent years, the world is facing severe challenges such as energy shortage, environmental degradation and climate warming. Photocatalysis has the functions of photo-splitting water to produce hydrogen, photodegrading organic pollutants and photoreducing carbon dioxide. Therefore, photocatalysis is playing an important role in solving energy problems, It has important application prospects in environmental problems and greenhouse gas treatment. TiO 2 With its advantages of stability, non-toxicity and cheapness, it was once considered to be the most promising photocatalytic material. However, with TiO 2 The representative traditional photocatalytic materials have low quantum yield and easy recombination of photogenerated electrons and holes, which greatly limits their ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128
Inventor 余火根徐林利王苹王雪飞余家国
Owner WUHAN UNIV OF TECH
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