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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  • Abstract
  • Description
  • Claims
  • Application Information

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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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Experimental program
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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 compound photocatalyst and a preparation method and application thereof. The TiO2-Pd-PPy compound photocatalyst is prepared by the steps: ultrasonically dispersing TiO2 in water, adding PdCl2 and a pyrrole monomer into the water, removing dissolved oxygen, and irradiating with a xenon lamp for photooxidation reduction. A one-step simultaneous photooxidation reduction deposition method adopted in the invention can realize precise positioning and loading of the Pd and PPy. In the compound photocatalyst prepared according to the preparation method, the deposition positions of the Pd and PPy are just the photocatalytic reaction active spots of photo-generated electrons and holes, and can effectively promote separation of photon-generated carriers. The prepared TiO2-Pd-PPy compound photocatalyst shows preferable photocatalysis activity, wherein under full gloss, the hydrogen production efficiency of a TiO2-0.5Pd-0.6PPy photocatalyst through photocatalystic decomposition of water can reach 602mumol / 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
CPCB01J31/38B01J35/004B01J37/12B01J37/16B01J37/344C01B3/042C01B2203/1064Y02E60/36
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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