UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and preparation method thereof

A uio-66-nh2, composite light technology, applied in physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve the problem of narrow photoresponse range, low quantum yield, photogenerated electron-hole pairs The problem of high recombination probability can achieve the effect of improving separation efficiency, simple process and improving light absorption capacity.

Active Publication Date: 2018-12-21
WUHAN UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

However, a single UiO-66-NH 2 Photocatalysts also face some problems, such as narrow photoresponse range, high recombination probability of photogenerated electron-hole pairs and low quantum yield, etc.
In order to improve these problems, further improve the efficiency of hydrogen production by photolysis of water, and rationally select other semiconductor materials, it is a simple and easy method to synthesize composite photocatalysts. For example, there are research reports: MoS 2 Introduction of UiO-66-NH 2 Composite photocatalyst MoS 2 /UiO-66-NH 2 /G(Hao, Xu

Method used

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  • UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and preparation method thereof
  • UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and preparation method thereof
  • UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A UiO-66-NH with Efficient Hydrogen Production 2 / TiO 2 / Ti 3 C 2 Composite photocatalyst and preparation method thereof. The steps of the preparation method are:

[0032] Step 1. Press Ti 3 AlC 2 : The molar ratio of hydrofluoric acid is 1: (40~45), first the Ti 3 AlC 2 Place it in a polytetrafluoroethylene lining, add hydrofluoric acid solution, stir for 24-30 hours, then alternately wash with deionized water and absolute ethanol for 5-8 times, centrifuge, and dry to obtain Ti 3 C 2 T x .

[0033] Step 2, the Ti 3 C 2 T x Put it in a crucible, and anneal it under a nitrogen atmosphere. The annealing temperature is 400-500°C, and the annealing time is 2-2.5h to obtain TiO 2 / Ti 3 C 2 Complex.

[0034] Step 3, according to the molar ratio of zirconium tetrachloride:N,N-dimethylformamide:hydrochloric acid is 1:10:60, the zirconium tetrachloride, the N,N-dimethylformamide and The hydrochloric acid was mixed and ultrasonically treated for 2-3 minutes to o...

Embodiment 2

[0044] A UiO-66-NH with Efficient Hydrogen Production 2 / TiO 2 / Ti 3 C2 Composite photocatalyst and preparation method thereof. The steps of the preparation method are:

[0045] Step 1. Press Ti 3 AlC 2 : The molar ratio of hydrofluoric acid is 1: (45~50), firstly the Ti 3 AlC 2 Put it in a polytetrafluoroethylene lining, then add hydrofluoric acid solution, stir for 30-36 hours, then alternately wash with deionized water and absolute ethanol for 5-8 times, centrifuge, and dry to obtain Ti 3 C 2 T x .

[0046] Step 2, the Ti 3 C 2 T x Put it in a crucible, and anneal it under a nitrogen atmosphere. The temperature of the annealing treatment is 500-600°C, and the time of the annealing treatment is 2.5-3 hours to obtain TiO 2 / Ti 3 C 2 Complex.

[0047] Step 3, according to the molar ratio of zirconium tetrachloride:N,N-dimethylformamide:hydrochloric acid is 1:10:60, the zirconium tetrachloride, the N,N-dimethylformamide and The hydrochloric acid was mixed and u...

Embodiment 3

[0054] A UiO-66-NH with Efficient Hydrogen Production 2 / TiO 2 / Ti 3 C 2 Composite photocatalyst and preparation method thereof. The steps of the preparation method are:

[0055] Step 1. Press Ti 3 AlC 2 : The molar ratio of hydrofluoric acid is 1: (50~55), first the Ti 3 AlC 2 Place it in a polytetrafluoroethylene lining, add hydrofluoric acid solution, stir for 36-42 hours, then alternately wash with deionized water and absolute ethanol for 5-8 times, centrifuge, and dry to obtain Ti 3 C 2 T x .

[0056] Step 2, the Ti 3 C 2 T x Put it in a crucible, and anneal it under a nitrogen atmosphere. The temperature of the annealing treatment is 600-700°C, and the time of the annealing treatment is 3-3.5 hours to obtain TiO 2 / Ti 3 C 2 Complex.

[0057] Step 3, according to the molar ratio of zirconium tetrachloride:N,N-dimethylformamide:hydrochloric acid is 1:10:60, the zirconium tetrachloride, the N,N-dimethylformamide and The hydrochloric acid was mixed and ultr...

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Abstract

The invention relates to a UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and a preparation method thereof. The preparation method comprises the following steps: Ti3AlC2 is placed in a polytetrafluoroethylene inner liner, a hydrofluoric acid solution is added, and obtained Ti3C2Tx is annealed to obtain a TiO2/Ti3C2 compound; zirconium tetrachloride, N,N-dimethylformamide and hydrochloric acid are mixed to obtain a zirconium tetrachloride solution; the TiO2/Ti3C2 compound is added to the zirconium tetrachloride solution and stirred to obtain a Zr<4+>/TiO2/Ti3C2mixed solution; 2-aminoterephthalic acid and the N,N-dimethylformamide are mixed to obtain an organic ligand solution; and the organic ligand solution is added to the Zr<4+>/TiO2/Ti3C2 mixed solutionfor hydrothermal reaction to obtain the UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production. The UiO-66-NH2/TiO2/Ti3C2 composite photocatalyst with efficient hydrogen production and the preparation method thereof have simple process and strong operability, and the prepared product can significantly improve the separation of photogenerated electrons-hole pairs in the photocatalytic process, and has excellent visible light decomposition water hydrogen production performance.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalysts. Specifically related to a UiO-66-NH with high efficiency hydrogen production 2 / TiO 2 / Ti 3 C 2 Composite photocatalyst and preparation method thereof. Background technique [0002] The massive combustion of fossil fuels has brought about global energy shortages and environmental pollution problems. Finding clean and sustainable alternative energy sources is a current research hotspot, and it is also a demand for the rapid development of society. Simulating the photosynthesis process in nature, using photocatalytic water splitting is an important way to convert solar energy into hydrogen energy. However, the water oxidation half-reaction is difficult to occur due to the four-electron transfer process involved. Therefore, finding stable and efficient photocatalysts is one of the key factors to realize photocatalytic water splitting. [0003] Metal-organic frameworks (MOFs f...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 赵雷田盼何漩方伟李薇馨陈辉汪花丽肖丰
Owner WUHAN UNIV OF SCI & TECH
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