Z type CdS-Ag-TiO2 composite photocatalytic material and preparation method and application thereof

A cds-ag-tio2, composite photocatalysis technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reduced redox ability and failure to completely solve photocorrosion, etc. Achieve the effect of maintaining chemical stability, reducing photocorrosion, and improving photocatalytic hydrogen production capacity

Active Publication Date: 2019-01-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to CdS and TiO 2 Although the traditional type II heterojunction can improve the effect of p

Method used

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  • Z type CdS-Ag-TiO2 composite photocatalytic material and preparation method and application thereof
  • Z type CdS-Ag-TiO2 composite photocatalytic material and preparation method and application thereof
  • Z type CdS-Ag-TiO2 composite photocatalytic material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0032] A Z-type CdS-Ag-TiO 2 The preparation method of composite photocatalytic material comprises the steps:

[0033] 1. Synthesis of CdS nanowires

[0034] Add 2 mL of n-dodecanethiol to 18 mL of ethylenediamine solution. After ultrasonic fusion, add 1 mmol of precursor cadmium acetate, and ultrasonically disperse to a transparent solution. Then, add 1 mmol of sodium sulfide, react in a polytetrafluoroethylene reactor at 180° C. for 24 to 48 hours; after cooling to room temperature, directly wash the precipitate with acetone and absolute ethanol to obtain CdS nanowires.

[0035] 2. Photoreduction synthesis of CdS-Ag

[0036] Add 20 mg of silver nitrate to 3 mL of water, and then dissolve the CdS nanowires prepared in step 1 in 97 mL of ultrapure water; then add the silver nitrate solution dropwise to the CdS nanowires and stir for 5 min; then, use a xenon lamp The mixed solution was irradiated for 30 minutes to achieve the purpose of photoreduction, and CdS-Ag was prepare...

Embodiment 2

[0044] A Z-type CdS-Ag-TiO 2 The preparation method of composite photocatalytic material comprises the steps:

[0045] 1. Synthesis of CdS nanowires

[0046] Add 1 mL of n-dodecanethiol to 19 mL of ethylenediamine solution, ultrasonically fuse, then add 1 mmol of precursor cadmium acetate, and ultrasonically disperse to a transparent solution. Then, add 2 mmol of sodium sulfide, react in a polytetrafluoroethylene reactor at 180° C. for 24 to 48 hours; after cooling to room temperature, directly wash the precipitate with acetone and absolute ethanol to obtain CdS nanowires.

[0047] 2. Photoreduction synthesis of CdS-Ag

[0048] Add 20 mg of silver nitrate to 4 mL of water, and then dissolve the CdS nanowires prepared in step 1 in 96 mL of ultrapure water; then add the silver nitrate solution dropwise to the CdS nanowires and stir for 5 min; then, use a xenon lamp The mixed solution was irradiated for 30 minutes to achieve the purpose of photoreduction, and CdS-Ag was prepar...

Embodiment 3

[0052] A Z-type CdS-Ag-TiO 2 The preparation method of composite photocatalytic material comprises the steps:

[0053] 1. Synthesis of CdS nanowires

[0054] Add 2 mL of n-dodecanethiol to 18 mL of ethylenediamine solution. After ultrasonic fusion, add 1 mmol of precursor cadmium acetate, and ultrasonically disperse to a transparent solution. Then, add 2 mmol of sodium sulfide, react in a polytetrafluoroethylene reactor at 180° C. for 24 to 48 hours; after cooling to room temperature, directly wash the precipitate with acetone and absolute ethanol to obtain CdS nanowires.

[0055] 2. Photoreduction synthesis of CdS-Ag

[0056] Add 20 mg of silver nitrate to 5 mL of water, and then dissolve the CdS nanowires prepared in step 1 in 95 mL of ultrapure water; then add the silver nitrate solution dropwise to the CdS nanowires and stir for 5 min; then, use a xenon lamp The mixed solution was irradiated for 30 minutes to achieve the purpose of photoreduction, and CdS-Ag was prepare...

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Abstract

The invention discloses a Z type CdS-Ag-TiO2 composite photocatalytic material and a preparation method and an application thereof. The preparation method comprises the following steps: preparing a CdS nanowire first through a solvothermal method by taking a mixed solution of ethanediamine and dodecanethiol as a solvent and adding a cadmium source and a sulfur source; then carrying out photo-reduction synthesis by taking silver nitrate as a raw material and the CdS nanowire as a substrate to obtain CdS-Ag; and finally, injecting titanium tetraisopropylate in an environment of oleic acid and oleylamine by taking the CdS-Ag as the substrate to prepare the Z type CdS-Ag-TiO2 composite photocatalytic material through a second time solvothermal method. By combining CdS, Ag and TiO2 to form a ternary Z type structure, the electron transfer direction is changed, so that the place of reduction reaction of hydrogen ions is transferred, photogenerated holes are turned to TiO2 then, and the TiO2is free of a photo-corrosive phenomenon, and therefore, the chemical stability of CdS is kept favorably. The photo-corrosive phenomenon of CdS can be reduced, and the photocatalytic hydrogen generation ability of a composite material between CdS and TiO2 is improved.

Description

technical field [0001] The present invention relates to the field of photocatalyst technology, more specifically, to a Z-type CdS-Ag-TiO 2 Composite photocatalytic material and its preparation method and application. Background technique [0002] Semiconductor photocatalysis technology is one of the important and promising ways to solve the energy crisis in today's society. TiO 2 It is a traditional photocatalytic material, but its absorption range is limited to ultraviolet light below 400 nm, which greatly limits its development. In addition to metal oxides, sulfides are also a large category. For example, CdS is a photocatalyst that responds to visible light. Its absorption edge extends to about 520nm, but its S 2- It is very easy to be self-oxidized by photogenerated holes during the illumination process, and photocorrosion occurs. Generally, in order to improve photocatalytic hydrogen production, two semiconductor materials with different energy band structures are u...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/10B01J37/16C01B3/04
CPCB01J27/04B01J35/0013B01J35/004B01J37/10B01J37/16C01B3/04Y02E60/36
Inventor 赵伟刘金成丁中祥张锦宏
Owner GUANGDONG UNIV OF TECH
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