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Preparation method and application of a high-efficiency photocatalyst srtio3/bi2wo6

A technology of photocatalysts and photocatalytic materials, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problem of raw materials not being cheap, and achieve the goal of being green and environmentally friendly Secondary pollution, no secondary pollution, good catalytic activity

Active Publication Date: 2018-03-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Raise Bi 2 WO 6 There are many methods for photocatalytic performance, such as doping with other metals, and Chinese patent CN102764659A uses cobalt to modify Bi 2 WO 6 Form a composite catalyst to increase the Bi 2 WO 6 photocatalytic activity, but cobalt is a heavy metal that pollutes the environment, and this method requires high-temperature calcination and the raw materials are not cheap

Method used

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preparation example Construction

[0019] The invention provides a high-efficiency photocatalytic material SrTiO 3 / Bi 2 WO 6 The preparation method, described photocatalyst is SrTiO 3 and Bi 2 WO 6 is a heterojunction catalyst formed by a secondary hydrothermal method, and the Bi 2 WO 6 It is a lamellar nanoparticle, and the preparation method comprises the following steps:

[0020] Step 1: Add TiCl 4 and Sr(OH) 2 ·8H 2 O was dissolved in a molar ratio of 1-5:1-10, then 11-15mL of 5mol / L NaOH solution was added dropwise, stirred evenly, placed in a hydrothermal kettle, heated at 120-180°C for 24-48h, and cooled to At room temperature, wash with deionized water and dry in vacuum to obtain nanoscale SrTiO 3 powder;

[0021] Step 2: To prepare different mass fractions of SrTiO 3 photocatalytic material, the prepared SrTiO 3 Powder, bismuth salt and tungstate are dissolved in deionized water according to the molar ratio of 1-10:0.5-15, SrTiO 3 The mass fraction is 1-15%, transferred to a hydrothermal...

Embodiment 1

[0028] 1.1 mL of TiCl 4 and 2.68g of Sr(OH) 2 ·8H 2 Dissolve O in 40mL of deionized water, add 13mL of 5mol / L NaOH solution dropwise, stir and transfer to a hydrothermal kettle, heat at 150°C for 36h, cool to room temperature after the reaction, wash with deionized water, and After vacuum drying at ℃ for 3h, SrTiO can be obtained 3 Powder; Weigh 0.1635g SrTiO 3 Dissolve in 40mL deionized water, add 4.8853g Bi(NO 3 ) 3 ·5H 2 O continued to stir, and 1.6621g Na 2 WO 4 2H 2 O was dissolved in 20mL deionized water, then added dropwise to the above precursor liquid, then transferred to a hydrothermal kettle, heated at 180°C for 12h; after the reaction was completed, cooled to room temperature, washed with deionized water, and dried in vacuum at 80°C The product can be obtained. 0.2g of SrTiO 3 / Bi 2 WO 6 The catalyst was dispersed into a 30 mg / L methyl orange solution, stirred vigorously for 30 min, and then irradiated by a visible light xenon lamp for 90 min. The abso...

Embodiment 2

[0030] 2.0 mL of TiCl 4 and 2.71g of Sr(OH) 2 ·8H 2 O was dissolved in 40mL of deionized water, and 14mL of 5mol / L NaOH solution was added dropwise, stirred, transferred to a hydrothermal kettle, heated at 160°C for 48h, cooled to room temperature after the reaction, washed with deionized water, and Vacuum drying at 80°C for 3 hours to obtain SrTiO 3 Powder; Weigh 0.1063g SrTiO 3 Dissolve in 40mL deionized water, add 4.9133g Bi(NO 3 ) 3 ·5H 2 O continued to stir, and 1.6592g (NH 4 ) 10 W 12 o 41 ·5H 2 After O was dissolved in 20mL of deionized water, it was added dropwise to the above precursor liquid, then transferred to a hydrothermal kettle, and heated at 180°C for 20h; after the reaction was completed, it was cooled to room temperature, washed with deionized water, and The product can be obtained by vacuum drying for 3 h. 0.2g of SrTiO 3 / Bi 2 WO 6 The catalyst was dispersed into a 30 mg / L rhodamine B solution, stirred vigorously for 30 min, and then irradia...

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Abstract

The invention relates to a preparation method and application of a photocatalyst SrTiO3 / Bi2WO6. The invention is used to solve the problems of low photocatalytic degradation efficiency, unstable catalyst, and recombination of photogenerated electrons and holes under visible light. The preparation method of the catalyst is as follows: under the condition of ultrasonic stirring, NaOH is added to the mixed solution of TiCl4 and Sr(OH)2 8H2O, then the obtained precursor is placed in a hydrothermal kettle for heating, and the product is washed and dried to obtain Nano-scale SrTiO3; after dissolving SrTiO3 in bismuth salt solution, mixing it with tungstate solution, heating it in a hydrothermal kettle, washing and drying the product, the SrTiO3 / Bi2WO6 photocatalytic material can be obtained. The catalyst material prepared by the invention has simple production method, high photocatalytic activity, stable performance and low price.

Description

technical field [0001] The invention relates to the preparation and application of a high-efficiency photocatalyst material, especially SrTiO for degrading organic dyes 3 / Bi 2 WO 6 A preparation method of a high-efficiency photocatalyst material and its high-efficiency degradation of rhodamine B or organic dyes with similar chromogenic groups under visible light. Background technique [0002] In recent years, the economy has developed rapidly, but energy and environmental problems have become increasingly prominent, and wastewater pollution has become one of the most serious environmental pollution. Some industrial wastewater contains a large amount of organic dyes, and the toxic aromatic hydrocarbon intermediates contained in these wastewater have carcinogenic properties. Sex, which is a great threat to the healthy life of human beings. Traditional water treatment methods, such as physical adsorption and membrane technology flocculation and sedimentation, only enrich an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C02F1/30C02F1/72C02F101/30C02F101/38
CPCY02W10/37
Inventor 周建成陈静滕宏程靳晶魏凌飞李乃旭
Owner SOUTHEAST UNIV
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