Abstract Ag/CdS composites were prepared by low-temperature solid-phase chemical reaction with the aid of sodium borohydride, and the effects of Ag content and surfactant sodium dodecyl sulfate on the composition, structure and catalytic activity of the composites were investigated. The photocatalytic results show that the composites AGCS-0.5 displays the highest photocatalytic performance when the mass percentage of Ag to CdS is 0.5. After introducing surfactant sodium dodecyl sulfate, the catalytic activity of the composites is also significantly improved. It can be attributed to the following aspects, on the one hand, introduction of Ag can enhance the light absorption ability of Ag/CdS composites, which leads to more carriers participating in the catalytic reaction. On the one hand, Ag is closely combined with CdS in the composites, which is beneficial to the rapid separation of photogenerated carriers. Furthermore, the surfactant sodium dodecyl sulfate enhances the synergistic effect between Ag and CdS, reduces the recombination probability of photogenerated electron-holes, and thus enhances the photocatalytic activity. Combined with UV-vis absorption spectroscopy, photocurrent, fluorescence spectroscopy and active species capture agents, a possible photocatalytic mechanism was proposed.

中文翻译：

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轻松合成具有改进光催化性能的 Ag/CdS 复合材料

摘要 借助硼氢化钠通过低温固相化学反应制备了Ag/CdS复合材料，研究了Ag含量和表面活性剂十二烷基硫酸钠对复合材料组成、结构和催化活性的影响。光催化结果表明，当Ag与CdS的质量百分比为0.5时，AGCS-0.5复合材料表现出最高的光催化性能。引入表面活性剂十二烷基硫酸钠后，复合材料的催化活性也得到显着提高。可以归因于以下几个方面，一方面，Ag的引入可以增强Ag/CdS复合材料的光吸收能力，从而导致更多的载体参与催化反应。一方面，Ag 与复合材料中的 CdS 紧密结合，有利于光生载流子的快速分离。此外，表面活性剂十二烷基硫酸钠增强了Ag和CdS之间的协同作用，降低了光生电子-空穴的复合概率，从而提高了光催化活性。结合紫外-可见吸收光谱、光电流、荧光光谱和活性物种捕获剂，提出了一种可能的光催化机理。