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Noble metal gold modified gold-titanium dioxide core-shell structure photocatalyst and preparation method thereof

A titanium dioxide, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. It can achieve the effect of good visible light response performance, large specific surface area, and easy operation.

Inactive Publication Date: 2017-08-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For unmodified titanium dioxide particles, due to their poor electron transport properties, the transport rate of electrons and holes generated by photoexcitation in the bulk phase is slow, resulting in serious electron and hole recombination, which greatly reduces the its quantum yield

Method used

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  • Noble metal gold modified gold-titanium dioxide core-shell structure photocatalyst and preparation method thereof
  • Noble metal gold modified gold-titanium dioxide core-shell structure photocatalyst and preparation method thereof
  • Noble metal gold modified gold-titanium dioxide core-shell structure photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Step 1, weigh an equal volume of sodium citrate aqueous solution and tetrachloroauric acid aqueous solution to mix uniformly, and heat to 95°C, add surfactant cetyltrimethylammonium bromide to the uniformly mixed solution and disperse evenly , to form a gold colloidal solution, wherein stirring is selected to achieve uniform mixing, and the time is 60min; ultrasonic selection is selected to achieve uniform dispersion, and the time is 4 hours; the mass percentage of sodium citrate in the sodium citrate aqueous solution is 1wt%, and the volume is 50ml; The concentration of tetrachloroauric acid in the gold acid aqueous solution is 1*10 -4 mol / L, the volume is 50ml; the mass of cetyltrimethylammonium bromide is 50mg.

[0048] In step 2, the gold colloidal solution prepared in step 1 and absolute ethanol are mixed evenly, and then added to a mixed solution composed of equal volumes of tetraethyl orthosilicate (TEOS) and ammonia water and dispersed evenly, and centrifuged; ...

Embodiment 2

[0054] Step 1, weigh equal volumes of sodium citrate aqueous solution and tetrachloroauric acid aqueous solution and mix them uniformly, and heat to 90°C, add surfactant cetyltrimethylammonium bromide to the uniformly mixed solution and disperse evenly , to form a gold colloidal solution, wherein stirring is selected to achieve uniform mixing, and the time is 45min; ultrasonic selection is selected to achieve uniform dispersion, and the time is 2 hours; the mass percentage of sodium citrate in the sodium citrate aqueous solution is 1wt%, and the volume is 50ml; The concentration of tetrachloroauric acid in the gold acid aqueous solution is 1*10 -4 mol / L, the volume is 50ml; the mass of cetyltrimethylammonium bromide is 50mg.

[0055] In step 2, the gold colloidal solution prepared in step 1 and absolute ethanol are mixed evenly, and then added to a mixed solution composed of equal volumes of tetraethyl orthosilicate (TEOS) and ammonia water and dispersed evenly, and centrifuge...

Embodiment 3

[0061]Step 1, weigh an equal volume of sodium citrate aqueous solution and tetrachloroauric acid aqueous solution to mix uniformly, and heat to 95°C, add surfactant cetyltrimethylammonium bromide to the uniformly mixed solution and disperse evenly , to form a gold colloidal solution, wherein stirring is selected to achieve uniform mixing, and the time is 30min; ultrasonic selection is selected to achieve uniform dispersion, and the time is 4 hours; the mass percentage of sodium citrate in the sodium citrate aqueous solution is 1wt%, and the volume is 50ml; The concentration of tetrachloroauric acid in the gold acid aqueous solution is 1*10 -4 mol / L, the volume is 50ml; the mass of cetyltrimethylammonium bromide is 50mg.

[0062] In step 2, the gold colloidal solution prepared in step 1 and absolute ethanol are mixed evenly, and then added to a mixed solution composed of equal volumes of tetraethyl orthosilicate (TEOS) and ammonia water and dispersed evenly, and centrifuged; T...

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Abstract

The invention discloses a noble metal gold modified gold-titanium dioxide core-shell structure photocatalyst and a preparation method thereof. The preparation method comprises: synthesizing a gold colloidal solution, uniformly dispersing, forming a gold-silica single-core single-shell structure by using silica, adding tetrabutyl titanate at a uniform speed in a dropwise manner, uniformly dispersing, carrying out a circulation reflux reaction to form a single-core gold-silica-titania composite structure, and etching the silica by using strong alkali. According to the present invention, the synthesis is performed by using the surfactant template method, the operation is simple and easy to perform, the reproducibility is good, the photocatalyst having the single-core single-shell structure has the high economic benefits, and the obtained catalyst material is the catalyst having the titanium dioxide hollow ball structure, and has the large specific surface area.

Description

technical field [0001] The invention relates to a method for preparing and modifying a titanium dioxide hollow sphere structure, specifically a specific method for preparing mononuclear gold-modified titanium dioxide by adding noble metal particle gold. Background technique [0002] At present, the main energy used in the world is fossil energy, which belongs to non-renewable energy. Its excessive use has caused a serious energy crisis, but also caused increasingly serious environmental pollution problems. Energy shortage and environmental pollution are two great challenges facing the world today, seriously restricting the sustainable development of human beings. Solar energy has the advantages of being inexhaustible and non-polluting. If solar energy can be fully utilized, the above two challenges can be easily solved. Therefore, it is of great significance to efficiently convert solar energy into usable energy forms. [0003] The research in the past three decades has f...

Claims

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Application Information

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IPC IPC(8): B01J23/52C02F1/30C02F101/38
CPCC02F1/30B01J23/52C02F2101/40C02F2101/308C02F2305/10B01J35/396B01J35/39
Inventor 巩金龙卢健伟王拓张鹏张冀杰
Owner TIANJIN UNIV
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