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Gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst and its application

A gold nanocluster and gold nanoparticle technology, which is applied in the gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst and application fields, can solve the problems of limiting the practical application of titanium dioxide and the like, and achieves the advantages of sustainable development and high photocatalysis. Activity, effect of simple preparation method

Inactive Publication Date: 2017-07-04
FUZHOU UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0004] Titanium dioxide is regarded as an ideal photocatalyst due to its advantages of non-toxicity, good chemical stability, strong oxidation ability, and low cost, but it only absorbs in the ultraviolet region, and its high recombination efficiency of photogenerated carriers greatly limits Practical application of titanium dioxide in photocatalytic solar energy conversion

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  • Gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst and its application

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preparation example Construction

[0025] A kind of gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst, its preparation method comprises the following steps:

[0026] 1) Dissolve chloroauric acid in water, add reduced glutathione equal to the weight of chloroauric acid, stir until colorless, then reflux at 70°C for 24 h, add acetonitrile for purification, centrifuge, wash and dry, obtaining solid gold nanoclusters, and redispersing the obtained solid gold nanoclusters into water to obtain a gold nanocluster solution;

[0027] 2) According to the weight ratio of titanium dioxide nanoparticles and solid gold nanoclusters of 100:1~100:5, mix and stir the solution of titanium dioxide nanoparticles and gold nanoclusters under weakly acidic conditions with a pH value of 4 for 4 h, centrifuge , washing, and drying to obtain a gold nanocluster-titanium dioxide composite material;

[0028] 3) Add 8 mL of lactic acid as a sacrificial agent to the composite material obtained in step 2) in a vacuu...

Embodiment 1

[0041]Dissolve 0.24 g of chloroauric acid in 300 mL of water, add 0.276 g of reduced glutathione and stir until colorless, then reflux at 70 °C for 24 h, add 900 mL of acetonitrile after cooling for purification, centrifuge, wash and dry , the resulting solid is redispersed in water to obtain a gold nanocluster solution; according to the weight ratio of titanium dioxide nanoparticles to solid gold nanoclusters is 100:3, the titanium dioxide nanoparticles are immersed in the gold nanocluster solution, and the solution pH The value was adjusted to 4, stirred for 4 hours, centrifuged, washed, dried, and ground to obtain a gold nanocluster-titanium dioxide composite material. The obtained gold nanocluster-titanium dioxide composite material was irradiated for 3 hours under the conditions of simulating sunlight, vacuum atmosphere, and adding lactic acid as a sacrificial agent. Particles to obtain a gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst. The av...

Embodiment 2

[0043] Dissolve 0.24 g of chloroauric acid in 300 mL of water, add 0.276 g of reduced glutathione and stir until colorless, then reflux at 70 °C for 24 h, add 900 mL of acetonitrile after cooling for purification, centrifuge, wash and dry , the resulting solid is redispersed into water to obtain a gold nanocluster solution; according to the weight ratio of titanium dioxide nanoparticles to solid gold nanoclusters is 100:1, the titanium dioxide nanoparticles are immersed in the gold nanocluster solution, and the solution pH The value was adjusted to 4, stirred for 4 hours, centrifuged, washed, dried, and ground to obtain a gold nanocluster-titanium dioxide composite material. The obtained gold nanocluster-titanium dioxide composite material was irradiated for 60 h under the conditions of simulating sunlight, vacuum atmosphere, and adding lactic acid as a sacrificial agent. Nanoparticles to obtain gold nanoclusters-gold nanoparticles-titanium dioxide composite photocatalyst. Th...

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Abstract

The invention discloses a gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst and application thereof. The gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst having different particle sizes is firstly obtained by preparing a gold nanocluster solution based on chloroauric acid and a reducing type glutathione as raw materials and carrying out an impregnation method and illumination condition control on gold nanocluster solution and titanium dioxide nanoparticles. The gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst is simple in preparation method without high temperature and high pressure conditions; compared with the existing gold nanocluster-titanium dioxide and gold nanoparticle-titanium dioxide catalysts, the gold nanocluster-gold nanoparticle-titanium dioxide compound photocatalyst disclosed by the invention is higher in photocatalytic efficiency and hydrogen production efficiency, can be used for hydrogen production by photolysis of water, and is beneficial to sustainable development of environments and energy sources.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and the sustainable development of environment and energy, and specifically relates to a gold nanocluster-gold nanoparticle-titanium dioxide composite photocatalyst with controllable nano-gold particle size and its application in photolysis of water to produce hydrogen . Background technique [0002] The energy crisis and environmental pollution caused by excessive use of fossil fuels have drawn more attention to green and sustainable photocatalytic solar energy conversion technologies. Among them, the hydrogen production technology by photolysis of water is considered to be a high-quality choice to replace fossil fuels due to its advantages of no pollution, mild conditions, and renewability. Therefore, it is a major challenge in the field of photocatalysis to design and construct photocatalysts that can efficiently absorb solar energy and have good conversion efficiency of photogenerated carr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J37/34C01B3/04
CPCY02E60/36
Inventor 徐艺军刘思奇
Owner FUZHOU UNIV
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