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A uio-66-nh for efficient hydrogen production 2 /tio 2 / ti 3 c 2 Composite photocatalyst and preparation method thereof

A technology of uio-66-nh2 and recombination of light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, hydrogen production, etc., can solve the problem of high recombination probability of photogenerated electron-hole pairs, low quantum yield, photo Narrow response range and other issues, to achieve the effect of improving light absorption capacity, improving separation efficiency, and strong operability

Active Publication Date: 2021-02-19
WUHAN UNIV OF SCI & TECH
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AI Technical Summary

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, Xuqiang, et al. Peculiarsynergetic effect of MoS 2 quantum dots and graphene on Metal-OrganicFrameworks for photocatalytic hydrogen evolution.Applied Catalysis B:Environmental210(2017):45-56.), Cd 0.2 Zn 0.8 S introduces UiO-66-NH 2 Synthesized in and Cd 0.2 Zn 0.8 S / UiO-66-NH 2 (Su, Yun, et al. Cd 0.2 Zn 0.8 S@UiO-66-NH 2 nanocomposites asefficient and stable visible-light-driven photocatalyst for H 2 evolution and CO 2 reduction.Applied Catalysis B:Environmental200(2017):448-457), but the above reports have not effectively solved the above problems

Method used

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  • A uio-66-nh for efficient hydrogen production <sub>2</sub> /tio <sub>2</sub> / ti <sub>3</sub> c <sub>2</sub> Composite photocatalyst and preparation method thereof
  • A uio-66-nh for efficient hydrogen production <sub>2</sub> /tio <sub>2</sub> / ti <sub>3</sub> c <sub>2</sub> Composite photocatalyst and preparation method thereof
  • A uio-66-nh for efficient hydrogen production <sub>2</sub> /tio <sub>2</sub> / ti <sub>3</sub> c <sub>2</sub> Composite photocatalyst 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 3C 2 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, 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 ultra...

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-NH with high efficiency hydrogen production 2 / TiO 2 / Ti 3 C 2 Composite photocatalyst and preparation method thereof. Its technical scheme is: the Ti 3 AlC 2 Placed in a polytetrafluoroethylene liner, adding hydrofluoric acid solution, the obtained Ti 3 C 2 T x Annealed to get TiO 2 / Ti 3 C 2 Complex. Mix zirconium tetrachloride, N,N-dimethylformamide and hydrochloric acid to obtain a zirconium tetrachloride solution. TiO 2 / Ti 3 C 2 The complex is added to the zirconium tetrachloride solution and stirred to obtain Zr 4+ / TiO 2 / Ti 3 C 2 mixture. Mix 2-aminoterephthalic acid and the N,N-dimethylformamide to obtain an organic ligand solution. to Zr 4+ / TiO 2 / Ti 3 C 2 The organic ligand solution is added to the mixed solution for hydrothermal reaction to obtain UiO‑66‑NH with high hydrogen production efficiency 2 / TiO 2 / Ti 3 C 2 composite photocatalyst. The invention has simple process and strong operability, and the manufactured product can significantly improve the separation of photogenerated electron-hole pairs in the photocatalysis process, and has excellent hydrogen production performance by splitting water with visible light.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCC01B3/042B01J27/24C01B2203/0277C01B2203/1041B01J35/39Y02E60/36
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