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A kind of tio2-pd-ppy composite photocatalyst and its preparation method and application

A technology of tio2-pd-ppy and compound light, which is applied in the direction of catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, chemical instruments and methods, etc., can solve the problem of inability to achieve precise positioning of Pd and PPy loads, Poor photocatalytic performance of photocatalysts, complex synthesis conditions and other problems, to achieve high commercial application prospects, simple and fast synthesis methods, and good photocatalytic activity

Active Publication Date: 2019-02-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, TiO 2 The preparation method of -Pd-PPy composite photocatalyst is time-consuming
In addition to the complex synthesis conditions, the precise positioning of Pd and PPy cannot be achieved, and the photocatalytic performance of the prepared photocatalyst is also poor.

Method used

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  • A kind of tio2-pd-ppy composite photocatalyst and its preparation method and application
  • A kind of tio2-pd-ppy composite photocatalyst and its preparation method and application
  • A kind of tio2-pd-ppy composite photocatalyst and its preparation method and application

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Embodiment 1

[0039] Weigh TiO 2 Add 300 mg of (P25) into 100 mL of deionized water, and sonicate for 5 minutes to form a uniform suspension. Under constant stirring conditions, the TiO 2 Add 250 μL palladium chloride (PdCl 2 , 0.0564mol / L) and 1.2×10 -2 -3.0×10 -2 mg pyrrole (Py) monomer. Among them, relative to TiO 2 , the mass fractions of Pd and PPy are 0.5wt% and 0.2wt%, 0.4wt%, 0.6wt%, 0.8wt%, 1.0wt%. Then, high-purity nitrogen gas was passed thereinto for 30 minutes to remove dissolved oxygen therein. Finally, use a 300W xenon lamp to irradiate with full light for 30 minutes, filter the obtained sample, wash it several times with deionized water and absolute ethanol, and dry it in an air atmosphere at 60°C for 12 hours to obtain TiO 2 -Pd-PPy composite photocatalyst.

[0040] Replace the pyrrole monomer with methanol, adjust the pH of the reaction solution to 3.0 with 1.0mol / L sodium hydroxide, and follow the same steps as above to obtain the comparative sample TiO 2 -0.5Pd....

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Abstract

The invention discloses a TiO2-Pd-PPy composite photocatalyst and its preparation method and application. TiO2 is ultrasonically dispersed in water, PdCl2 and pyrrole monomer are added thereto, and after dissolved oxygen is removed, it is irradiated with a xenon lamp to cause photooxidation and reduction. TiO2‑Pd‑PPy composite photocatalyst was obtained. The one-step simultaneous photoredox deposition method used in the present invention can achieve precise positioning loading of Pd and PPy. In the TiO2-Pd-PPy composite photocatalyst prepared by the present invention, the deposition position of Pd and PPy happens to be the photocatalytic reaction active site of photogenerated electrons and holes, which can effectively promote the separation of photogenerated carriers. The prepared TiO2-Pd-PPy composite photocatalyst shows good photocatalytic activity. Under full light, the photocatalytic hydrogen production efficiency of TiO2-0.5Pd-0.6PPy photocatalyst can reach 602 μmol / h.

Description

technical field [0001] The invention relates to a novel photocatalytic material, in particular to a TiO 2 -Pd-PPy composite photocatalyst and its preparation method and application. Background technique [0002] As a carbon-free fuel, hydrogen energy is considered an ideal energy source because it can replace fossil fuels to reduce carbon emissions. Since 1972, Fijishima and Honda reported on the n-type semiconductor TiO 2 Photoinduced splitting of water on a single crystal electrode to generate H 2 and O 2 , photocatalytic technology has become one of the effective strategies to directly convert solar energy into hydrogen energy. So far, thousands of photocatalysts have been applied in photocatalytic water splitting for hydrogen production. Among them, titanium dioxide (TiO 2 ) is the earliest and most studied photocatalyst, however, its wide bandgap (-3.2eV) and low quantum efficiency severely limit the practical application of titania. Therefore, it will be of grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01J37/34B01J37/12B01J37/16C01B3/04
CPCC01B3/042B01J31/38B01J37/12B01J37/16B01J37/344C01B2203/1064B01J35/39Y02E60/36
Inventor 张倩倩李鑫黄柏标王朋王泽岩张晓阳秦晓燕刘媛媛
Owner SHANDONG UNIV
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