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Z type heterojunction MoS2/Bi2WO6 composite photocatalyst as well as preparation method and application thereof

A composite light and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, botanical equipment and methods, etc., can solve problems affecting photocatalytic activity, etc., achieve good practical value, good visible light absorption performance, good The effect of stability and reusability

Inactive Publication Date: 2020-10-09
THE FIRST INST OF OCEANOGRAPHY SOA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Bi 2 WO 6 Monomer materials have the problem of rapid recombination of photogenerated carriers, which greatly affects their photocatalytic activity.

Method used

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  • Z type heterojunction MoS2/Bi2WO6 composite photocatalyst as well as preparation method and application thereof
  • Z type heterojunction MoS2/Bi2WO6 composite photocatalyst as well as preparation method and application thereof
  • Z type heterojunction MoS2/Bi2WO6 composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 MoS 2 / Bi 2 WO 6 Preparation of Heterojunction Composite Photocatalyst

[0029] (1)MoS 2 Preparation: add 1mmol (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and 30 mmol CH 4 N 2 S, stirred and dissolved, transferred to a 100mL polytetrafluoroethylene reactor, reacted at 220°C for 18h, cooled to room temperature, filtered to collect the precipitate, washed several times with deionized water and ethanol, and then heated at 60°C Dry under normal pressure to obtain MoS 2 sample.

[0030] (2)MoS 2 / Bi 2 WO 6 Preparation of heterojunction composite photocatalyst: 1mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of ethylene glycol, and 0.5 mmol Na was added with constant stirring 2 WO 4 2H 2 O forms solution A; 0.6g MoS 2 Dissolve in 20mL ethanol, ultrasonically disperse for 6h to form solution B. Add solution B dropwise to solution A under stirring, then continue to stir for 10 minutes, transfer to a 50mL polytetrafluoroethylene reactor, react at 160°C for 10 h...

Embodiment 2

[0037] Example 2 MoS 2 / Bi 2 WO 6 Preparation of Heterojunction Composite Photocatalyst

[0038] Compared with Example 1, (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and CH 4 N 2 The molar ratio of S is 1:25. Add 1 mmol (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and 25 mmol CH 4 N 2 S, stirred to dissolve, transferred to a 100mL polytetrafluoroethylene reactor, reacted at 220°C for 18h, cooled to room temperature, filtered to collect the precipitate, washed several times with deionized water and ethanol, and kept at 60°C after washing Dry under high pressure to obtain MoS 2 sample. Then 1mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of ethylene glycol, and 0.5 mmol Na was added with constant stirring 2 WO 4 2H 2 O forms solution A; 0.6g MoS 2 Dissolve in 20mL ethanol, ultrasonically disperse for 6h to form solution B. Add solution B dropwise to solution A under stirring, then continue to stir for 10 minutes, transfer to a 50mL polytetrafluoroethylene reactor, react at 160°C for 1...

Embodiment 3

[0039] Example 3 MoS 2 / Bi 2 WO 6 Preparation of Heterojunction Composite Photocatalyst

[0040] Compared with Example 1, the control MoS 2 Ultrasonic time is 4h. Add 1 mmol (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and 30 mmol CH 4 N 2 S, stirred and dissolved, transferred to a 100mL polytetrafluoroethylene reactor, reacted at 200°C for 18h, cooled to room temperature, filtered to collect the precipitate, washed with deionized water and ethanol, and then heated at 60°C under normal pressure Drying under , to get MoS 2 sample. Then 1mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of ethylene glycol, and 0.5 mmol Na was added with constant stirring 2 WO 4 2H 2 O forms solution A; 0.6g MoS 2 Dissolve in 20mL ethanol, ultrasonically disperse for 4h to form solution B. Add solution B dropwise to solution A under stirring, then stir for 10min, transfer to a 50mL polytetrafluoroethylene reactor, react at 160°C for 14h, cool to room temperature, collect the precipitate by filtrat...

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Abstract

The invention belongs to the field of photocatalysis, and particularly relates to a Z type MoS2 / Bi2WO6 heterojunction composite photocatalyst as well as a preparation method and application thereof. The MoS2 / Bi2WO6 heterojunction composite photocatalyst is composed of MoS2 and Bi2WO6, and the mass ratio of the MoS2 to the Bi2WO6 is (0.08: 1)-(0.12: 1). The MoS2 / Bi2WO6 heterojunction composite photocatalyst is obtained by two steps of operation, the preparation method comprises the following steps: preparing flower-like MoS2 by a hydrothermal synthesis method; then performing dispersing and stripping under an ultrasonic condition; adding Bi (NO3) 3.5 H2O and Na2WO4. 2H2O; and finally obtaining the MoS2 / Bi2WO6 heterojunction composite photocatalyst under a hydrothermal condition. The preparation method is simple in process, low in cost and easy to implement; a Z type MoS2 / Bi2WO6 heterojunction structure with a visible light response function is constructed; the photocatalyst prepared bythe method is uniform in particle size distribution to accelerate separation of photon-generated carriers, the photocatalyst has efficient photocatalytic activity and stability under visible light, has efficient killing and degrading effects on harmful microorganisms and dye pollutants in a water body, and has good practical value and potential application prospect in the fields of water body purification, marine pollution prevention and the like.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, in particular to a Z-type MoS 2 / Bi 2 WO 6 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] Since Fujishima and Honda first reported TiO in 1972 2 Since water can be decomposed into hydrogen and oxygen under ultraviolet light, semiconductor photocatalysis technology has attracted extensive attention due to its excellent performance. [1] . Through in-depth research on photocatalytic technology, researchers have promoted the continuous development of its applications in photolysis of water, degradation of organic pollutants, antifouling and sterilization, and energy conversion. [2-4] . In order to improve the TiO 2 For the utilization rate of sunlight and photocatalytic efficiency, researchers have modified it through element doping, noble metal loading and material compounding. At the same time, they have also...

Claims

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Application Information

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IPC IPC(8): B01J27/051A01N59/16A01P1/00C02F1/30C02F101/30C02F101/34C02F101/38
CPCB01J27/051A01N59/16C02F1/30C02F2101/308C02F2303/04C02F2305/10C02F2101/34C02F2101/38B01J35/39
Inventor 鞠鹏张雨郝雷蒋凤华李景喜曹为孙承君
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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