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首页> 外文期刊>RSC Advances >Synergistic effect of graphene as a co-catalyst for enhanced daylight-induced photocatalytic activity of Zn0.5Cd0.5S synthesized via an improved one-pot co-precipitation-hydrothermal strategy
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Synergistic effect of graphene as a co-catalyst for enhanced daylight-induced photocatalytic activity of Zn0.5Cd0.5S synthesized via an improved one-pot co-precipitation-hydrothermal strategy

机译：石墨烯作为助催化剂的协同作用，通过改进的一锅共沉淀-水热策略合成，以增强日光诱导的Zn0.5Cd0.5S的光催化活性

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In this study, a series of reduced graphene oxide (RGO)-Zn0.5Cd0.5S nanocomposites was synthesized via an improved one-step co-precipitation-hydrothermal strategy using thiourea as an organic S source. The experimental results demonstrated that thiourea facilitated heterogeneous nucleation of Zn0.5Cd0.5S and in situ growth of Zn0.5Cd0.5S nanocrystals on the RGO sheets via electrostatic attraction. Moreover, the addition of NaOH as a precipitating agent in the reaction environment was found to reduce the aggregation of Zn0.5Cd0.5S on the RGO sheets. Such an intimate interfacial contact between Zn0.5Cd0.5S and RGO resulted in well-dispersed nanoparticles decorated on RGO sheets. Photocatalytic performances of the RGO-Zn0.5Cd0.5S were evaluated by the degradation of Reactive Black 5 (RB5) under a low-power 15 W energy-saving daylight bulb at ambient conditions. Compared with pristine Zn0.5Cd0.5S, 20RGO-Zn0.5Cd0.5S (20 wt% of RGO) displayed an enhanced RB5 degradation of 97.4% with a rate constant of 0.0553 min(-1) after 60 min of visible light irradiation. 20RGO-Zn0.5Cd0.5S exemplified a 1.3-fold enhancement after RGO incorporation relative to that for pristine Zn0.5Cd0.5S. The remarkable photocatalytic performance was ascribed to the efficient migration efficiency of the photoinduced electrons from Zn0.5Cd0.5S to RGO to inhibit the charge carrier recombination. Additionally, to systematically verify the role of each active species in the degradation of RB5, trapping experiments for radicals and holes were individually explored. It is confirmed that photogenerated O-.(2)-, (OH)-O-. and h(+) were responsible for the degradation of RB5 in the 20RGO-Zn0.5Cd0.5S system. Lastly, a postulated visible-light photocatalytic mechanism for the RB5 degradation was discussed.
机译：在这项研究中，通过使用硫脲作为有机S源的改进的一步共沉淀-水热策略，合成了一系列还原氧化石墨烯（RGO）-Zn0.5Cd0.5S纳米复合材料。实验结果表明，硫脲通过静电吸引作用促进了RGO片材上Zn0.5Cd0.5S的异质成核和Zn0.5Cd0.5S纳米晶体的原位生长。此外，发现在反应环境中添加NaOH作为沉淀剂可减少RGO板上Zn0.5Cd0.5S的聚集。 Zn0.5Cd0.5S和RGO之间的这种紧密的界面接触导致在RGO板上装饰的分散良好的纳米颗粒。 RGO-Zn0.5Cd0.5S的光催化性能通过在环境条件下在低功率15 W节能日光灯泡下反应性黑5（RB5）的降解来评估。与原始Zn0.5Cd0.5S相比，20RGO-Zn0.5Cd0.5S（RGO的20 wt％）在可见光照射60分钟后显示RB5降解增强了97.4％，速率常数为0.0553 min（-1）。与原始Zn0.5Cd0.5S相比，RGO掺入后20RGO-Zn0.5Cd0.5S增强了1.3倍。出色的光催化性能归因于光致电子从Zn0.5Cd0.5S到RGO的有效迁移效率，从而抑制了电荷载流子的重组。另外，为了系统地验证每种活性物质在RB5降解中的作用，分别探索了自由基和空穴的捕获实验。确认了光生O-。（2）-，（OH）-O-。和h（+）负责RB5在20RGO-Zn0.5Cd0.5S系统中的降解。最后，讨论了假定的可见光对RB5降解的光催化机理。

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