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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible light-driven photocatalytic water purification and H-2 generation
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Petal-like CdS nanostructures coated with exfoliated sulfur-doped carbon nitride via chemically activated chain termination for enhanced visible light-driven photocatalytic water purification and H-2 generation

机译：通过化学活化的链终止涂覆剥离硫掺杂氮化物的花瓣状Cds纳米结构，用于增强可见光催化的光催化水净化和H-2代

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摘要

Novel composite photocatalysts consisting of petal-like cadmium sulphide (CdS) nanoparticles and varying amounts of exfoliated sulfur-doped carbon nitride (SCN) were successfully prepared. The as-obtained materials were characterized by field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, ultraviolet-visible diffuse reflection spectroscopy, photoluminescence spectroscopy and photo current-time measurement. Results indicate a strong electric coupling interaction between SCN and CdS due to the heterojunction formed at the amine functionalities sites and oxidized chain terminations of SCN. Two typical pollutants like rhodamine B (RhB) and colorless bisphenol A (BPA) were used for the evaluation of photo catalytic activity. The best-performing CdS/SCN composite (i.e., CS5) synthesized exhibited enhanced visible light-driven photocatalytic RhB efficiency of about 8.71 and 4.06 times higher than those of pure exfoliated SCN and CdS, respectively. As for BPA degradation, the CS5 composite was 9.00 and 3.61 times more efficient than that of exfoliated SCN and CdS, respectively. These excellent performances were found to be attributable to the remarkable charge carrier separation between CdS and exfoliated SCN with the aid of heterojunction interfacial structures. More importantly, the exfoliated SCN substantially reinforced the photostability of the CdS nano particles. Evaluation of the photocatalytic H-2 evolution showed that the visible-light H-2 production rate of the best-performing CS5 composite was also much greater than the constituents at 247.72 mu mol h(-1) g(-1). Cyclic tests demonstrated the stability of the CS5 composite over repeated use. A possible mechanism was proposed to explain the photocatalytic reaction process. This study provides new insights into the preparation of highly efficient and stable sulfide-based composite photocatalysts, which are promising for implementation in wide-ranging environmental applications.
机译：成功制备了由花瓣状硫化镉（Cds）纳米颗粒和不同量的剥落的硫掺杂碳氮（ScN）组成的新型复合光催化剂。通过现场发射扫描电子显微镜，X射线衍射，X射线光电子能，紫外线可见漫射反射光谱，光致发光光谱和光电流测量的作为所得的材料。结果表明SCN和CDS之间的强电耦合相互作用由于胺官能团位点和SCN的氧化链终端形成的异质结。罗丹明B（RHB）和无色双酚A（BPA）等典型污染物用于评估光催化活性。合成的最佳CDS / SCN复合（即，CS5）分别合成的可见光催化光催化RHB效率分别高出约8.71和4.06倍，分别高于纯剥离的SCN和CD。对于BPA降解，CS5复合材料分别比去角化SCN和CDS的效率高9.00和3.61倍。发现这些优异的性能可归因于CDS之间的显着电荷载流子分离，借助异质结界面结构。更重要的是，去角质的SCN基本上加强了Cds纳米颗粒的光稳定性。光催化H-2进化的评价表明，最佳性能的CS5复合材料的可见光H-2生产率也大于247.72μmMolH（-1）G（-1）的成分。循环试验证明CS5复合材料在重复使用中的稳定性。提出了一种可能的机理来解释光催化反应过程。本研究为制备高效稳定的硫化物基复合光催化剂提供了新的见解，这是在广泛的环境应用中实现的。

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