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Composite photocatalyst, preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problem of low photocatalytic efficiency, and achieve the effects of good dispersion, good fluidity and good catalytic degradation effect.

Inactive Publication Date: 2018-12-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects and deficiencies of the prior art, the purpose of the present invention is to provide a composite photocatalyst, a preparation method and its application to solve the problem of low photocatalytic efficiency of existing photocatalysts

Method used

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  • Composite photocatalyst, preparation method and application thereof
  • Composite photocatalyst, preparation method and application thereof
  • Composite photocatalyst, preparation method and application thereof

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preparation example Construction

[0035] The preparation method of above-mentioned composite photocatalyst is:

[0036] Step 1, degreasing, roughening, activating, and silane coupling treatment are performed on the hollow glass microspheres in sequence, so that the surface of the hollow glass microspheres is free of impurities and rich in hydroxyl groups;

[0037] The degreasing process is as follows: disperse the hollow glass microspheres in the degreasing liquid, stir at 60-80°C for 20-30min, filter and wash with water. Wherein, the degreasing liquid is prepared by dissolving sodium hydroxide, sodium carbonate and sodium silicate in deionized water according to the volume-mass concentration ratio of 8:2:1. Preferably, the mass volume concentrations of sodium hydroxide, sodium carbonate and sodium silicate in the oil removal solution are 40g / L, 10g / L and 5g / L respectively. The amount of hollow glass microspheres added is 10g to 20g to 1L of degreasing liquid.

[0038] The coarsening process is as follows: soa...

Embodiment 1

[0048] First, pretreat the hollow glass microspheres: degreasing: prepare a mixture of 1L 40g / L sodium hydroxide, 10g / L sodium carbonate and 5g / L sodium silicate and heat it to 95°C, and take the nominal diameter distribution as φ15 10g of -75μm GS60 hollow glass microspheres were added to the mixture, and the hollow microspheres were fully dispersed by mechanical stirring. After 45 minutes, the upper layer of floating microspheres was taken for suction filtration and washed with deionized water, and then dried at 60°C; The hollow glass microspheres after the above treatment were placed in 5% ammonium fluoride solution, heated in a water bath at 60°C and magnetically stirred, washed with acetone, absolute ethanol, and deionized water respectively until neutral after 2 hours, and made after suction filtration. Drying treatment; Activation: configure hydrogen peroxide acidic solution (wt(H 2 o 2 ) = 5%, wt (HCl) = 6%), put the roughened and dried hollow glass microspheres in th...

Embodiment 2

[0059] The difference between this embodiment and embodiment 1 is: according to the mass ratio of the amount of graphene oxide added to the pretreated hollow glass microspheres is 0.1%. The TiO that present embodiment obtains 2 The degradation efficiency of the / graphene / hollow glass microsphere composite photocatalyst is 88%-90%.

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Abstract

The invention discloses a composite photocatalyst, a preparation method and an application thereof. The composite photocatalyst comprises hollow glass beads, and graphene and TiO2 supported on the surface of the hollow glass beads. The method comprises the following steps: firstly pretreating the hollow glass beads, and loading the surface of the pretreated hollow glass beads with a graphene oxidelayer to form a graphene oxide / hollow glass bead composite material; placing the bead composite material into a TiO2 precursor, and reacting at appropriate pressure, at appropriate stirring speed andat 100-200 DEG C for 4-12 h so as to obtain the composite photocatalyst. In comparison with traditional TiO2 loaded hollow glass beads, the composite photocatalyst has good response to visible light,higher utilization rate of sunlight, and has a better effect of catalyzing pollutants. The composite photocatalyst of the invention has the characteristics of easy recovery and good dispersity. The composite photocatalyst has a regular spherical shape and good fluidity such that the composite photocatalyst is extremely easy to disperse in a matrix during application.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a composite photocatalyst, a preparation method and an application thereof. Background technique [0002] Photocatalytic technology has broad application prospects in the treatment of environmental pollutants, photolysis of water to produce hydrogen, solar cells and other fields. Since Honda-Fujishima discovered TiO in 1972 2 Since the discovery of the photocatalytic water splitting phenomenon of semiconductor electrodes, semiconductor photocatalysis technology has received extensive attention and rapid development in the fields of energy utilization and environmental purification. Nano-TiO 2 Due to the advantages of high oxidation activity, large specific surface area, good chemical stability, non-toxic to human body, low cost, and no pollution, it is currently the most widely used photocatalyst, but TiO 2 Semiconductor-based photocatalyst technology still ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J35/08C02F1/30C02F101/36C02F101/38C02F101/34
CPCC02F1/30B01J21/18C02F2101/36C02F2101/34C02F2101/38C02F2305/10B01J35/51B01J35/39
Inventor 王磊王雷磊耿雅甜王旭东
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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