Preparation method of titanium dioxide nanoparticles/graphene composite photocatalytic material

A graphene composite, photocatalytic material technology, applied in the field of photocatalytic composite material preparation, can solve the problems of low light utilization efficiency, limited photocatalytic activity, etc., and achieves broad application prospects, good dispersibility, and controllable particle size effects.

Inactive Publication Date: 2017-06-06
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure TiO 2 The photocatalyst has a wide band gap and a forbidden band gap of 3.2 eV. It can only be excited by absorbing short-wavelength ultraviolet light, and ultraviolet light only accounts for 5% of sunlight, so pure TiO 2 Light use efficiency is low
On the other hand, when TiO 2 When the photocatalyst is irradiated by sunlight, the electron-hole pairs excited by the sunlight do not migrate to the surface rapidly, but recombine rapidly inside, which becomes another factor limiting its photocatalytic activity.

Method used

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  • Preparation method of titanium dioxide nanoparticles/graphene composite photocatalytic material
  • Preparation method of titanium dioxide nanoparticles/graphene composite photocatalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Step 1: After adding 37.5ml of ethanol and 20mg of graphene oxide powder into the beaker to stir and disperse, ultrasonically 1 h to disperse the graphene oxide powder in ethanol evenly. Add 2.5ml of deionized water and 0.3ml of concentrated sulfuric acid, then add 0.085g of tetra-n-butyl titanate dropwise, and stir for 0.5h to obtain a mixed solution;

[0024] Step 2: Transfer the mixed solution to a round bottom flask, reflux at 80° C. for 20 h, and then centrifuge to obtain a precipitate.

[0025] Step 3: Put the precipitate obtained in Step 2 into 40ml of water and 0.8ml of DMF mixed solvent and stir for 30min, transfer the mixed solution into a polytetrafluoroethylene liner, put it into a stainless steel reaction kettle, and keep it warm at 200°C for 16h.

[0026] Step 4: Centrifuge the product obtained after incubation for 10 minutes under the centrifugation condition of 11000 r / min to collect the precipitate, and then wash twice with deionized water and ethanol r...

Embodiment 2

[0028] Step 1: After adding 37.5ml of ethanol and 20mg of graphene oxide powder into the beaker to stir and disperse, ultrasonically 1 h to disperse the graphene oxide powder in ethanol evenly. Add 2.5ml of deionized water and 0.3ml of concentrated sulfuric acid, then add 0.2556g of tetra-n-butyl titanate dropwise, and stir for 0.5h to obtain a mixed solution;

[0029] Steps 2, 3 and 4 are the same as in Example 1. The product is denoted as G1T3.

Embodiment 3

[0031] Step 1: After adding 37.5ml of ethanol and 20mg of graphene oxide powder into the beaker to stir and disperse, ultrasonically 1 h to disperse the graphene oxide powder in ethanol evenly. Add 2.5ml of deionized water and 0.3ml of concentrated sulfuric acid, then add 0.5113g of tetra-n-butyl titanate dropwise, and stir for 0.5h to obtain a mixed solution;

[0032] Steps 2, 3 and 4 are the same as in Example 1. The product is designated as G1T6.

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Abstract

The invention discloses a preparation method of a titanium dioxide nanoparticles/graphene composite photocatalytic material. With tetra-n-butyl titanate, graphite powder, concentrated sulfuric acid, concentrated nitric acid and DMF as main raw materials, and a titanium dioxide nanoparticles/graphene composite photocatalytic material is prepared by a method of slow hydrolysis prior to hydrothermal synthesis. The photocatalytic performance of the prepared material is tested by simulated sunlight, and the bio-refractory organic pollutant rhodamine B is degraded to prove the excellent photocatalytic performance of the material. As an inorganic photocatalytic material, the composite material has relatively high photocatalytic activity and is of a perfect application prospect in environmental protection. The method has the advantages that the particle size of titanium dioxide is controllable, the graphene sheets are of good dispersity, and the titanium dioxide only grows on the graphene surface and is uniformly dispersed on the graphene sheets.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide nanoparticle / graphene composite photocatalytic material, belonging to the field of photocatalytic composite material preparation. Background technique [0002] Since the beginning of the 21st century, with the application and development of science and technology, while enjoying the comfort and convenience brought by technology to life, people have also suffered the bitter fruit of environmental degradation caused by blindness and short-sightedness. Suffering from environmental pollution, people have been looking for solutions to environmental pollution, but many methods are not accepted because of their low efficiency or high cost. In recent years, the photocatalytic technology of using solar energy to solve the problem of environmental pollution has become the research focus of the scientific community. Photocatalyst was proposed in such an environment. It mainly uses semiconductor o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C02F1/30C02F101/30
CPCB01J21/18B01J35/004B01J35/0073C02F1/30C02F2101/308C02F2305/10
Inventor 谢宇孙朝阳伏雨辰凌云吴世豪钱家来
Owner NANCHANG HANGKONG UNIVERSITY
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