Carbon quantum dots modified BiOCl for highly efficient degradation of contaminants benefited from effective generation of center dot O-2(-)
Carbon quantum dots modified BiOCl for highly efficient degradation of contaminants benefited from effective generation of center dot O-2(-)
复制标题
碳量子点修饰 BiOCl 可高效降解污染物，受益于中心点 O-2(-) 的有效生成
DOI：
10.1016/j.mssp.2021.106165
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发表时间：
2021
影响因子：
4.1
通讯作者：
Fan Huajun
中科院分区：
文献类型：
--
作者：
Yang Cai;Liu Huanhuan;Zhong Junbo;Li Jianzhang;Huang Shengtian;Fan Huajun
对光催化剂进行表面改性是提高光催化性能的有效途径，可以加速光活性载体的分离。本文采用水热法制备了碳量子点（CQDs）/BiOCl复合材料，进一步提高了BiOCl的催化性能。X射线光电子能谱（XPS）和低温电子自旋共振（ESR）证实了CQDs/BiOCl的成功构建。表面光电压谱（SPS）、扫描电子显微镜（SEM）和电化学表征表明，CQD的存在显著影响了BiOCl的表面状态，加速了光生载流子的分离，导致反应体系中·O2−的增强.反应体系中·O2−含量越高，光催化活性越强。以苯酚、罗丹明B（RhB）和四环素（TC）为降解物，研究了CQDs/BiOCl的光催化活性。通过CQD对BiOCl进行表面修饰，可以显着提高BiOCl对苯酚、RhB和TC的光破坏活性。当CQDs含量为15 mL时，CQDs/BiOCl对苯酚、RhB和TC的降解能力分别是BiOCl的24倍、4.26倍和2.4倍。结合观察结果，阐述了CQDs/BiOCl光催化增强的机理。
Surface modification of photocatalyst is an effective way to improve the photocatalytic performance and can accelerate the separation of photoactivated carriers. In this paper, Carbon quantum dots (CQDs)/BiOCl composites were prepared by a facile hydrothermal method, which further improves the catalytic performance of BiOCl. X-ray photoelectron spectroscopy (XPS) and cryogenic electron spin resonance (ESR) confirm the successful construction of CQDs/BiOCl. Surface photovoltage spectroscopy (SPS), scanning electron microscopy (SEM) and electrochemical characterization show that the presence of CQDs significantly affects the surface state of BiOCl, accelerates the separation of photoinduced carriers, and results in the enhancement of·O2−in the reaction system. Higher level of·O2−in the reaction system shows stronger photocatalytic activity. The photocatalytic activity of CQDs/BiOCl was studied by destruction of phenol, rhodamine B (RhB) and tetracycline (TC). The photo-destruction activity of BiOCl toward phenol, RhB and TC is significantly improved by surface modification of BiOCl by CQDs. Interestingly, when the content of CQDs is 15 mL, the degradation capacity of CQDs/BiOCl toward phenol, RhB and TC is 24 times, 4.26 times and 2.4 times of that of BiOCl, respectively. Combined with the observation results, the photocatalytic enhancement mechanism of CQDs/BiOCl was elaborated.