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BiOI/MoS2 heterojunction composite photocatalyst as well as preparation method and application thereof

A technology of composite light and catalyst, applied in the field of photocatalysis, can solve the problems that hinder the development of BiOI materials, achieve good visible light absorption performance and photocatalytic performance, improve visible light catalytic activity, and have good practical value

Inactive Publication Date: 2020-10-16
THE FIRST INST OF OCEANOGRAPHY SOA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, BiOI has the advantages of being cheap and easy to prepare, but BiOI also has some disadvantages to overcome, such as the strong recombination ability of electrons and holes in BiOI due to the small band gap.
Moreover, the conduction band position of BiOI is more positive than the reduction potential of hydrogen, which prevents the generation of active groups
These factors have hindered the further development of BiOI materials

Method used

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  • BiOI/MoS2 heterojunction composite photocatalyst as well as preparation method and application thereof
  • BiOI/MoS2 heterojunction composite photocatalyst as well as preparation method and application thereof
  • BiOI/MoS2 heterojunction composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 BiOI / MoS 2 Preparation of Heterojunction Composite Photocatalyst

[0033] (1)MoS 2 Preparation: add 1mmol (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and 20 mmol CH 4 N 2 S, stirred and dissolved, transferred to a 100mL polytetrafluoroethylene reactor, reacted at 200°C for 20h, 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.

[0034] (2)BiOI / MoS 2 Preparation of heterojunction composite photocatalyst: 0.16g MoS 2 , 0.1mmol Bi(NO 3 ) 3 ·5H 2 O and 1g of PVP were dissolved in 30mL of ethylene glycol and ultrasonicated for 6h to form solution A; 0.3mmol KI was dissolved in 10mL of ultrapure water to form solution B. Add solution B dropwise to solution A under stirring, continue to stir for 30min after the dropwise addition is completed, transfer to a 50mL polytetrafluoroethylene reactor, react at 180°C for 48h, cool to roo...

Embodiment 2

[0040] Example 2 BiOI / MoS 2 Preparation of Heterojunction Composite Photocatalyst

[0041] 1) The difference from Example 1 is that the control (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and CH 4 N 2 The molar ratio of S is 1:30. 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 20h, 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.

[0042] 2) Then 0.16g MoS 2 , 0.1mmol Bi(NO 3 ) 3 ·5H 2 O and 1g of PVP were dissolved in 30mL of ethylene glycol, sonicated for 6h to form solution A; 0.3mmol KI was dissolved in 10mL of ultrapure water, ultrasonically dispersed for 6h to form solution B. Add solution B dropwise to solution A under stirring, then continue to stir for 30 minutes, transfer to a 50mL polytetrafluoroethy...

Embodiment 3

[0043] Example 3 BiOI / MoS 2 Preparation of Heterojunction Composite Photocatalyst

[0044] The difference from Example 1 is that the control of MoS 2 Ultrasonic time is 4h. Add 1 mmol (NH 4 ) 6 Mo 7 o 24 ·5H 2 O and 20 mmol CH 4 N 2 S, stirred and dissolved, transferred to a 100mL polytetrafluoroethylene reactor, reacted at 200°C for 20h, 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 0.16g MoS 2 , 0.1mmol Bi(NO 3 ) 3 ·5H 2 O and 1g of PVP were dissolved in 30mL of ethylene glycol and ultrasonicated for 4h to form solution A; 0.3mmol was dissolved in 10mL of ethanol to form solution B. Add solution B dropwise to solution A under stirring, then stir for 30min, transfer to a 50mL polytetrafluoroethylene reactor, react at 180°C for 48h, cool to room temperature, collect the precipitate by filtration, and use Washed with ...

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Abstract

The invention belongs to the field of photocatalysis, and particularly relates to a BiOI / MoS2 heterojunction composite photocatalyst as well as a preparation method and application thereof. The BiOI / MoS2 heterojunction composite photocatalyst is composed of MoS2 and BiOI, and the mass ratio of the BiOI to the MoS2 is 0.02:1 to 0.1:1. The BiOI / MoS2 heterojunction composite photocatalyst is obtainedby two steps of operation, the preparation method comprises the following steps: firstly, preparing flower-like MoS2 by a hydrothermal synthesis method, then dispersing and stripping under an ultrasonic condition, adding Bi (NO3) 3.5 H2O and KI, and finally obtaining the BiOI / MoS2 heterojunction composite photocatalyst under a hydrothermal condition. According to the invention, the BiOI / MoS2 heterojunction with visible light response is constructed; the photocatalyst prepared by the method is uniform in particle size distribution, accelerates separation of photon-generated carriers, 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 photocatalysis, in particular to a BiOI / MoS 2 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] As we all know, global environmental pollution is becoming more and more serious, and water pollution has become a major problem that plagues mankind. In the ocean, the problem of biofouling also limits human exploration of the ocean. In order to overcome this problem, scientists have conducted a lot of research. Semiconductor materials provide a new way to solve the above problems. Semiconductor materials are being widely used in human society, and their uses in various fields are being explored. Since the discovery of TiO by Fujishima et al. 2 Since it has photocatalytic properties, more and more photocatalyst materials have been developed and applied [1,2] . Among them, bismuth oxyiodide (BiOI) has become a promising photocatalytic materia...

Claims

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Application Information

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IPC IPC(8): B01J27/06A61L2/08C02F1/30C02F101/30
CPCB01J27/06C02F1/30A61L2/088C02F2101/308C02F2303/04C02F2305/10B01J35/39
Inventor 郝雷鞠鹏张雨翟晓凡曹为蒋凤华李景喜孙承君
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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