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Efficient heterojunction ultraviolet light catalyst and preparation method and application thereof

A photocatalyst and heterojunction technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low photocatalytic efficiency, poor photocorrosion performance, and narrow light range, and achieve High photocatalytic performance, long service life and accelerated degradation effect

Active Publication Date: 2016-06-01
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a high-efficiency heterojunction ultraviolet photocatalyst and its preparation method and application in order to solve the problems of low photocatalytic efficiency, poor stability, poor photocorrosion performance and narrow light range of the catalyst under ultraviolet light.

Method used

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Embodiment 1

[0026] 1.1mLTiCl 4 Diluted in 2.3mL of 2mol / L hydrochloric acid solution, then 2.6659gSr(OH) 2 ·8H 2 O was dissolved in 40 mL of deionized water under ultrasonication, and the two solutions were mixed well. Add 13mL of 6mol / L NaOH solution to the above solution, transfer it to a hydrothermal kettle, and keep it at 180°C for 48h. Wash and dry to get 1.73g of SrTiO 3 powder. 0.0091gSrTiO 3 , 3mmolBi(NO 3 ) 3 ·6H 2 O and 3 mmol Na 3 PO 4 12H 2 O was added to 40ml of distilled water and magnetically stirred to form a homogeneous solution. Under magnetic stirring, nitric acid was added to adjust the pH to 1. After the above solution was stirred at room temperature for 30 minutes, put it in a reaction kettle for 48 hours at 180°C, wash it with ionized water and ethanol several times after cooling, and dry it in vacuum to obtain 1wt%-SrTiO 3 / BiPO 4 Photocatalyst (1% SrTiO 3 accounted for the percentage content of the entire catalyst). 0.2g of BiPO 4 and SrTiO 3 / Bi...

Embodiment 2

[0028] SrTiO 3 The preparation method of powder is with embodiment 1. 0.0270gSrTiO 3 , 3mmolBiCl 3 and 5mmolNa 2 HPO 4 12H 2 O was added to 40ml of distilled water and magnetically stirred to form a homogeneous solution. Under magnetic stirring, nitric acid was added to adjust the pH to 2. After the above solution was stirred at room temperature for 30 minutes, put it in a reaction kettle for 54 hours at 160°C, wash it with ionized water and ethanol several times after cooling, and dry it in vacuum to obtain 2wt%-SrTiO 3 / BiPO 4 catalyst of light. 0.2g of SrTiO 3 / BiPO 4 The catalyst was added to 250 mL of 30 mg / L methylene blue solution, irradiated by a 100 w Hg lamp, and the degradation rate of methylene blue was 94.84% after 3 hours.

Embodiment 3

[0030] SrTiO 3The preparation method of powder is with embodiment 1. 0.04570gSrTiO 3 、3mmolBi(Ac) 3 and 6mmolNaH 2 PO 4 12H 2 O was added to 40ml of distilled water and magnetically stirred to form a homogeneous solution. Under magnetic stirring, nitric acid was added to adjust the pH to 3. After the above solution was stirred at room temperature for 30 minutes, it was placed in a reaction kettle at 200°C for 24 hours. After cooling, it was washed with ionized water and ethanol several times, and dried in vacuum to obtain 5wt%-SrTiO 3 / BiPO 4 catalyst of light. 0.2g of SrTiO 3 / BiPO 4 The catalyst was added to 250 mL of 30 mg / L methylene blue solution, irradiated by a 100 w Hg lamp, and the degradation rate of methylene blue was 97.94% after 3 hours.

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Abstract

The invention discloses an efficient heterojunction ultraviolet light catalyst and a preparation method of the efficient heterojunction ultraviolet light catalyst. The efficient heterojunction ultraviolet light catalyst is a heterojunction catalyst prepared from SrTiO3 and BiPO4. The preparation method comprises the following steps: putting SrTiO3 into a mixed solution of Bi(NO3)3.5H2O and Na3PO4; regulating the pH (Potential of Hydrogen) of the solution by HNO3; putting the solution in a hydrothermal reactor for heating after ultrasonic stirring; washing and drying a product, thus obtaining the efficient heterojunction ultraviolet light catalyst. The preparation method disclosed by the invention is simple and easy, the preparation process is simple, the cost is low, an MB (Methylene Blue) solution (of which the degradation rate is up to 97.94 percent) can be efficiently degraded under the illumination of ultraviolet light, and the preparation method has a good application prospect in forest product chemical wastewater, such as tannin extract, rosin and furfural, which is difficult to be biodegraded and other industrial wastewater.

Description

technical field [0001] The present invention relates to the field of photocatalytic materials and waste water treatment, especially the difficult biodegradable tannin, rosin and furfural production and other forest chemical waste water and other industrial waste water, specifically related to SrTiO 3 / BiPO 4 Photocatalyst and its preparation method. Background technique [0002] In today's society, the organic chemical wastewater discharged from industries such as forestry chemical industry, textile printing and dyeing, pulping and papermaking, and pesticide chemical industry has increasingly attracted great attention from all over the world due to its characteristics of dark color, high toxicity, and refractory degradation. Moreover, the composition of these industrial wastewaters is complex, containing a variety of organic dyes and aromatic compounds, making it difficult to degrade and treat such wastewater. Scientists have also explored some methods of treating chemical...

Claims

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Application Information

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IPC IPC(8): B01J27/186C02F1/32C02F1/72
CPCC02F1/32C02F1/725B01J27/186C02F2101/308C02F2101/38C02F2305/10B01J35/39
Inventor 田庆文施英乔房桂干丁来保邓拥军沈葵忠盘爱享韩善明焦健李红斌梁芳敏张华兰林艳梁龙冉淼
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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