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Metal-graphene-titanium dioxide nanotube array photocatalyst and preparation and application method thereof

A nanotube array and titanium dioxide technology, applied in the field of composite photocatalysts, can solve the problems of difficult to effectively degrade organic pollutants, poor adsorption capacity, high recombination rate of photogenerated electrons and holes, etc.

Inactive Publication Date: 2012-09-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high recombination rate of photogenerated electrons and holes, the photocatalytic efficiency is low, and the hydrophilic property of titanium dioxide is its poor adsorption capacity for organic pollutants, so it is difficult to effectively degrade organic pollutants in water.

Method used

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  • Metal-graphene-titanium dioxide nanotube array photocatalyst and preparation and application method thereof
  • Metal-graphene-titanium dioxide nanotube array photocatalyst and preparation and application method thereof
  • Metal-graphene-titanium dioxide nanotube array photocatalyst and preparation and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of titania nanotube arrays

[0025] ① Grind the surface of the base material titanium sheet, clean it and set aside;

[0026] ② Preparation of inorganic electrolyte: the electrolyte is composed of 0.1MNaF and 0.5MNaHSO 4 The composition of the aqueous solution;

[0027] ③Under the condition of 15V DC voltage, using pure titanium sheet as the anode and platinum sheet as the cathode, the titanium dioxide nanotube array is electrolyzed in the electrolyte;

[0028] ④The titania nanotube array prepared above was calcined under aerobic conditions at 500°C for 3 hours to crystallize it into a titania nanotube array.

[0029] (2) Preparation of graphene (RGO) film

[0030] ① Preparation of graphene oxide aqueous dispersion: graphene oxide is dispersed in Na2HPO4 buffer solution with pH = 9.18, and ultrasonicated for 30 minutes before use;

[0031] ②Using the titanium dioxide nanotube array electrode as the working electrode, the platinum electrode as the cou...

Embodiment 2

[0042] In embodiment 1, AgNO3 is replaced by PdCl2, and all the other are the same as embodiment 1.

[0043] Under the same conditions in Example 1, the degradation efficiency of Pd-RGO-TiO2 nanotube array photocatalytic degradation 2,4-dichlorophenoxyacetic acid is 91.33%, and the direct photodegradation efficiency is 6.72%. Pure TiO2 Nanotube array photocatalytic The degradation efficiency is 43.99%, the photocatalytic degradation efficiency of Pd-TiO2 composite is 47.88%, and the photocatalytic degradation efficiency of RGO-TiO2 is 78.98%.

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Abstract

The invention discloses a metal-graphene-titanium dioxide nanotube array photocatalyst and a preparation and application method thereof. Graphene and metal are taken as common carriers of photo-induced electrons of titanium dioxide, thus the recombination rate of the photo-induced electrons and holes is lowered, and finally, the degradation efficiency of the catalyst to organic pollutants is improved through the adsorption performance of the graphene to the organic pollutants. The catalyst has good performance in the aspect of treating water pollutants, and has the advantages of simple preparation method and low cost.

Description

Technical field: [0001] The invention belongs to the technical field of new materials and their preparation, and relates to a novel and efficient composite photocatalyst for treating organic wastewater. Background technique: [0002] Titanium dioxide has become a research hotspot for semiconductor photocatalysts because of its good band gap, strong oxidation ability, non-toxicity, and good biological, chemical and photochemical stability. However, due to the high recombination rate of photogenerated electrons and holes, the photocatalytic efficiency is low, and the hydrophilic nature of titanium dioxide makes it difficult to effectively degrade organic pollutants in water because of its poor adsorption capacity for organic pollutants. The invention uses graphene and metal to modify the titanium dioxide nanotube array, graphene and metal are used as the carrier of photogenerated electrons, reduces the recombination rate of titanium dioxide photogenerated electrons and holes, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J23/52A62D3/10
Inventor 罗胜联刘承斌滕雅蓉张锡霖
Owner HUNAN UNIV
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