Facile fabrication of novel Cd3(C3N3S3)2/CdS porous composites and their photocatalytic performance for toluene selective oxidation under visible light irradiation
Facile fabrication of novel Cd3(C3N3S3)2/CdS porous composites and their photocatalytic performance for toluene selective oxidation under visible light irradiation
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DOI：
10.1016/j.apcatb.2018.04.008
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Jie He;Lang Chen;Du Ding;Ya-Kun Yang;C. Au;S. Yin
中科院分区：
文献类型：
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作者：
Jie He;Lang Chen;Du Ding;Ya-Kun Yang;C. Au;S. Yin
采用简单的水热方法构建了具有异质结的新型多孔 Cd3(C3N3S3)2/CdS 复合材料。在合成中，采用Cd3(C3N3S3)2（记为Cd3(TMT)2）作为前驱体，自发的自分解过程负责异质结和多孔结构的形成。通过控制水热温度以及Cd3(TMT)2分解水平，可以调节Cd3(TMT)2/CdS复合材料的光催化活性。在155℃下制备的复合材料对甲苯选择性氧化生成苯甲醛表现出优异的光催化性能，在可见光（λ≥420nm）下无需任何溶剂即可产生787μmolg−1h-1的苯甲醛生成速率。其优异的性能归功于独特的Cd3(TMT)2/CdS多孔结构：表面积大且异质结丰富。在光催化中，催化剂的大表面积能够富集吸附的反应物，异质结的存在有利于光生电子和空穴的分离和转移。预计该方法适用于生成用于光催化目的的有机/无机复合材料。
A simple hydrothermal approach was adopted for the construction of novel porous Cd3(C3N3S3)2/CdS composites that were endowed with heterojunctions. In the synthesis, Cd3(C3N3S3)2(denoted as Cd3(TMT)2) was adopted as precursor, and a spontaneous self-decomposition process is responsible for the formation of heterojunctions and porous structure. By controlling the hydrothermal temperature and hence the level of Cd3(TMT)2decomposition, the photocatalytic activity of the Cd3(TMT)2/CdS composites can be regulated. The composite prepared at 155 °C exhibits outstanding photocatalytic performance towards toluene selective oxidation to benzaldehyde, giving a benzaldehyde formation rate of 787 μmol g−1h-1under visible light (λ ≥ 420 nm) without the need of any solvent. The excellent performance is ascribed to the unique Cd3(TMT)2/CdS porous structure: large in surface area and rich in heterojunctions. In photocatalysis, the large surface area of a catalyst enables enrichment of adsorbed reactants, and the presence of heterojunctions facilitates separation and transfer of photogenerated electrons and holes. It is envisaged that the method is suitable for the generation of organic/inorganic composites for photocatalytic purposes.