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Preparation method of mesoporous MoS2/Sm2O3 photocatalyst

A photocatalyst and mesoporous technology, which is applied in the field of environmental science and engineering, can solve the problems of long step cycle and complicated preparation method, and achieve the effect of low requirement for reaction device, simple preparation process and good industrial application prospect

Inactive Publication Date: 2019-08-30
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned literature reports, Sm 2 o 3 Most of the preparation methods require more complicated steps and a long cycle

Method used

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  • Preparation method of mesoporous MoS2/Sm2O3 photocatalyst
  • Preparation method of mesoporous MoS2/Sm2O3 photocatalyst
  • Preparation method of mesoporous MoS2/Sm2O3 photocatalyst

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preparation example Construction

[0028] The invention provides a novel mesoporous MoS for degrading organic pollutants 2 / Sm 2 o 3Photocatalyst and its preparation method. The present invention uses sodium molybdate and thiourea as the main raw materials, citric acid as the acidity regulator, firstly prepares petal-shaped molybdenum disulfide powder by hydrothermal synthesis, and dissolves the obtained molybdenum disulfide powder in samarium nitrate solution for ultrasonication After that, sodium hydroxide solution was added dropwise, filtered, dried, and annealed to obtain photocatalytically active mesoporous MoS 2 / Sm 2 o 3 catalyst of light. A novel mesoporous MoS for degrading organic pollutants of the present invention 2 / Sm 2 o 3 Photocatalysts are composite oxides composed of mesoporous and nanoscale. The catalyst has a complete morphology, samarium oxide is evenly loaded on the surface of molybdenum disulfide, has good crystallinity, and developed mesopores, which can improve its photocatalyt...

Embodiment 1

[0036] Weigh 0.578 g of sodium molybdate and 0.7 g of thiourea, dissolve them in 40 ml of deionized water and stir for 30 minutes until completely dissolved, then add 0.47 g of citric acid, stir for 10 minutes, transfer to a hydrothermal reaction kettle, and heat at 200 degrees After 21 hours of reaction at lower temperature, it was taken out, washed with deionized water, and dried at 60 degrees to obtain molybdenum disulfide powder. Weigh 0.05 g of precursor molybdenum disulfide powder, dissolve 50 ml of 0.0005 mol / L samarium nitrate in it and ultrasonicate for 5 minutes, then add 40 ml of 0.002 mol / L sodium hydroxide solution dropwise at 0°C , at this time the molar ratio of molybdenum disulfide / samarium oxide was 1:0.08, then washed, filtered, dried and annealed in a tube furnace to obtain mesoporous MoS 2 / Sm 2 o 3 Photocatalyst, denoted as 1# sample.

Embodiment 2

[0038] Weigh 0.578 g of sodium molybdate and 0.7 g of thiourea, dissolve them in 40 ml of deionized water and stir for 30 minutes until completely dissolved, then add 0.47 g of citric acid, stir for 10 minutes, transfer to a hydrothermal reaction kettle, and heat at 200 degrees After 21 hours of reaction at lower temperature, it was taken out, washed with deionized water, and dried at 60 degrees to obtain molybdenum disulfide powder. Weigh 0.05 g of precursor molybdenum disulfide powder, dissolve 50 ml of 0.001 mol / L samarium nitrate in it and ultrasonicate for 5 minutes, then add 80 ml of 0.002 mol / L sodium hydroxide solution dropwise at 0°C , at this time the molar ratio of molybdenum disulfide / samarium oxide was 1:0.16, then washed, filtered, dried and annealed in a tube furnace to obtain mesoporous MoS 2 / Sm 2 o 3 Photocatalyst, recorded as 2# sample.

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Abstract

The invention belongs to the fields of environmental science and engineering, and specifically relates to a novel preparation method of a mesoporous MoS2 / Sm2O3 photocatalyst used for degrading organicpollutants. The method comprises the following steps: sodium molybdate and thiourea are used as main raw materials, citric acid is used as an acidity regulating agent, firstly petal-like molybdenum disulfide powder is prepared by adopting a hydrothermal synthesis method, the obtained molybdenum disulfide powder is dissolved into a samarium nitrate solution, after ultrasonic treatment is performed, a sodium hydroxide solution is added dropwise, filtration is performed, drying is performed, annealing is performed, and therefore the mesoporous MoS2 / Sm2O3 photocatalyst with photocatalytic activity is obtained, wherein the mesoporous MoS2 / Sm2O3 photocatalyst is a composite oxide composed of mesopores and a nano-scale material. The catalyst provided by the invention has complete morphology, samarium oxide is uniformly supported on the surface of molybdenum disulfide, the crystal state is good, the mesopores are developed, and the photocatalytic ability to degrade organic matter can be improved; and in addition, the heterostructure is formed, and the distribution morphology is better, so that the photocatalyst has better catalytic performance than common titanium dioxide-supported samarium oxide in the application fields such as sewage treatment.

Description

technical field [0001] The invention belongs to the field of environmental science and engineering disciplines, specifically a mesoporous MoS used for photocatalytic degradation of organic pollutants 2 / Sm 2 o 3 Preparation method of composite photocatalyst. Background technique [0002] In recent years, semiconductor photocatalysis technology has been widely used in environmental protection and photolysis of water to produce hydrogen, and the preparation of high-efficiency and low-consumption photocatalysts is a key issue in the application of photocatalysis technology in actual water treatment. MoS 2 As a graphene-like two-dimensional layered material, it consists of two layers of hexagonal dense stacking and a middle layer of molybdenum atoms to form a sandwich structure. weak van der Waals connection. Due to MoS 2 It has a relatively large specific surface area, more edge active sites, and an adjustable forbidden band width. The range of its bandwidth is 1.2-1.95eV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J35/02B01J35/10C02F1/30C02F101/30B01J35/00
CPCB01J27/051C02F1/30C02F2101/30C02F2305/10B01J35/39B01J35/00B01J35/30B01J35/612B01J35/647
Inventor 牛军峰梁桓精汤皎宁汪艳萍
Owner DONGGUAN UNIV OF TECH
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