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Photo-Chemical Energy Conversion by Pillared Hydrotalcite

柱状水滑石的光化学能转换

基本信息

批准号：
63550570
负责人：
SATO Tsugio
金额：
$ 1.09万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550570/
关键词：
Hydrotalcite Pillaered Compound Photo-Chemical Energy Conversion Photocatalyst CdS ZnS Ultrafine powder

项目摘要

CdS and CdS-ZnS mixed semiconductor particles were incorporated into the interlayer of hydrotalcite by the chemical reactions between Cd(edta)^<2-> and S^<2-> in the interlayer. The incorporated particles seemed to be small as less than 0.4 nm in thickness. The band gap energies of CdS and sequentially precipitated CdS followed by ZnS in the interlayer were slightly larger than that of normal-crystalline CdS. On the other hand, the band gap energy of CdS/ZnS mixture coprecipitated in the interlayer was almost equal to the average value of those of normal-crystalline CdS and ZnS. The CdS and CdS/ZnS mixture incorporated into hydrotalcite were capable of efficient hydrogen evolution by irradiation with visible light in the presence of Na_2S and/or Na_2SO_3 as a sacrificial donor. The hydrogen production activities of the catalyst incorporated in hydrotalcite were in the order of sequentially precipitated CdS followed by ZnS > simultaneously precipitated CdS-ZnS mixture >> CdS. Mass transfer problems of the products through the interlayer restricted the efficiency of the semiconductor incorporated into hydrotalcite for the visible light induced hydrogen evolution. Almost the same amounts of S_2O_6^<2-> and SO_4^<2-> were formed by the photochemical oxidation of SO_3^<2-> aqueous solution with unsupported CdS/ZnS, but that of S_2O_6^<2-> produced in the same reaction with CdS/ZnS incorporated into hydrotalcite significantly decreased.

通过Cd（edta）2与层间S 2的化学反应，将CdS和CdS-ZnS混合半导体颗粒嵌入水滑石层间<2-><2->。掺入的颗粒似乎很小，厚度小于0.4 nm。层间CdS和依次沉淀CdS和ZnS的带隙能量略大于正常晶态CdS。另一方面，在中间层中共沉淀的CdS/ZnS混合物的带隙能量几乎等于正常晶体CdS和ZnS的带隙能量的平均值。以Na_2S和/或Na_2SO_3为牺牲给体，CdS和CdS/ZnS混合物在可见光照射下具有高效的放氢性能。水滑石负载型催化剂的产氢活性顺序为先沉淀CdS后沉淀ZnS >同时沉淀CdS-ZnS混合物>> CdS。产物通过中间层的传质问题限制了半导体嵌入水滑石的可见光诱导析氢效率。无<2->载体CdS/ZnS<2->光催化氧化SO_3 ~（2-）<2->水溶液生成的S_2O_6 ~（2-）和SO_4 ~（2-）量基本相同，<2->而CdS/ZnS掺入水滑石后，生成的S_2O_6 ~（2-）量明显减少。