Titanium dioxide nano wire microsphere photocatalysis material with hydrogenated surface and preparation method thereof

A titanium dioxide and surface hydrogenation technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problems of low quantum efficiency of titanium dioxide, surface hydrogenation, etc. The effect of crystallinity and large industrialization value

Inactive Publication Date: 2012-08-15
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art above, to provide a titanium dioxide nanowire microsphere photocatalytic material with surface hydrogenation using titanate nanotubes as a precursor, which can solve the low quantum efficiency of existing titanium dioxide and the problems of surface hydrogenation technology

Method used

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  • Titanium dioxide nano wire microsphere photocatalysis material with hydrogenated surface and preparation method thereof
  • Titanium dioxide nano wire microsphere photocatalysis material with hydrogenated surface and preparation method thereof
  • Titanium dioxide nano wire microsphere photocatalysis material with hydrogenated surface and preparation method thereof

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Embodiment 1

[0030] Firstly, the titanate nanotube microsphere precursor was synthesized by the alkali-thermal method we have reported: 5.1g of tetrabutyl titanate and 75mL of absolute ethanol were mixed together, and then 0.33mL of 98% sulfuric acid and 0.3mL of deionized water. The mixed solution was magnetically stirred for 0.5 h, then transferred to a dry polytetrafluoroethylene-lined stainless steel reactor, heated to 180° C. in a drying oven and kept for 4 h, and the white precipitate in the reactor was collected and dried. Mix 0.5g of precipitate and 50mL of 10M NaOH solution together, transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel reaction kettle, heat to 150°C in a dry box and keep it warm for 24h. Subsequently, the precipitate was collected and dispersed into 600 mL of 0.1 M hydrochloric acid solution, stirred for 12 hours, and then filtered and washed with deionized water until neutral. After the product was collected, the titanate nanotube micros...

Embodiment 2

[0038] First, the precursor of titanate nanotube microspheres was synthesized by the reported alkali-thermal method (same as in Example 1); 0.5 g of the precursor was put into the quartz boat in the center of the quartz tube, and then the quartz tube was placed horizontally into the tubular In the furnace, continuously feed H at a flow rate of 200 sccm 2 Mixed gas (5%H 2 with 95%N 2 ), the tube furnace was raised to 500°C at a heating rate of 3°C / min and held for 4 hours. After the tube furnace was naturally cooled to 150°C, the H 2 , the surface hydrogenated titanium dioxide nanowire microspheres can be obtained.

Embodiment 3

[0040] First, the precursor of titanate nanotube microspheres was synthesized by the reported alkali-thermal method (same as in Example 1); 0.5 g of the precursor was put into the quartz boat in the center of the quartz tube, and then the quartz tube was placed horizontally into the tubular In the furnace, H was continuously introduced at a flow rate of 250 sccm 2 Mixed gas (5%H 2 with 95%N 2 ), the tube furnace was raised to 500°C at a heating rate of 4°C / min and held for 2 hours. After the tube furnace was naturally cooled to 150°C, the H 2 , the product can be collected to obtain surface hydrogenated titanium dioxide nanowire microspheres.

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Abstract

The invention discloses a titanium dioxide nano wire microsphere photocatalysis material with a hydrogenated surface and a preparation method thereof. The microsphere has a diameter of 3-6mu m, the sphere is composed of anatase titanium dioxide nano wires with the diameter of 7-9nm, the specific surface area is 75m<2> / g and the pore volume is 1.02cm<3> / g. The preparation method comprises the following steps: placing a titanic hydroxide nanotube microsphere precursor in a quartz boat in the center of a quartz tube, then placing the quartz tube horizontally in a tubular furnace, and continuously introducing mixed H2 with the flow of 200-300sccm, wherein the mixed H2 contains 5% H2 and 95% N2 by volume percent; raising the temperature of the tubular furnace at the rate of 3-5 DEG C / min to 500 DEG C, keeping the temperature for 2-4h, stopping introducing the mixed H2 until the tubular furnace is naturally cooled to 150 DEG C, and collecting the product to obtain the titanium dioxide nano wire microsphere photocatalysis material with the hydrogenated surface. The microsphere disclosed by the invention has remarkably enhanced visible light absorption, ensures that a great amount of hydroxyl radicals can be generated under the irradiation of visible light, and has enhanced hydrogen-making efficiency by water photolysis and 2,4-chlorophenosic acid photocatalytic degradation activity under full-spectrum irradiation.

Description

[0001] technical field [0002] The invention relates to a surface-hydrogenated titanium dioxide nanowire microsphere photocatalytic material and a preparation method thereof, which can be used for photolysis of water to produce hydrogen and degrade organic pollutants, and belongs to the technical field of titanium dioxide catalysts. Background technique [0003] Energy and environmental issues are the main issues facing people in the world today. Titanium dioxide can effectively use the ultraviolet region of solar energy to photolyze water to produce hydrogen and oxidize organic pollutants, and has become the most widely used semiconductor photocatalytic material. However, its large forbidden band width and fast electron-hole recombination rate greatly limit the photocatalytic efficiency of titanium dioxide. For the restriction factor of carrier recombination, it can be improved by improving the charge transport behavior (usually by improving nano level morphology) to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/10C01B3/04A62D3/17A62D101/28
CPCY02E60/364Y02E60/36
Inventor 秦晓燕郑昭科张晓阳黄柏标
Owner SHANDONG UNIV
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