Preparation of hierarchical micro/nanostructured Bi2S3-WO3 composites for enhanced photocatalytic performance
Preparation of hierarchical micro/nanostructured Bi2S3-WO3 composites for enhanced photocatalytic performance
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DOI：
10.1016/j.jallcom.2016.06.210
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发表时间：
2016-11
影响因子：
6.2
通讯作者：
Jian Rong;Tao Zhang;F. Qiu;X. Rong;Xiaolu Zhu;Xiaoying Zhang
中科院分区：
文献类型：
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作者：
Jian Rong;Tao Zhang;F. Qiu;X. Rong;Xiaolu Zhu;Xiaoying Zhang
采用简单的水热-后煅烧相结合的方法成功合成了由WO 3微球和Bi 2S 3针状纳米晶组成的新型分级微/纳米结构光催化剂。在可见光照射下，将所制备的Bi 2S 3-WO 3复合材料用于光催化去除水中的罗丹明B（RhB）有机污染物。采用XRD、SEM、TEM、N2吸附-脱附、UV-vis DRS、XPS和PL光谱对样品的形貌和结构进行了表征。结果表明：70%-Bi 2S 3-WO 3的光催化活性最高，在100 min内对RhB溶液的降解率超过90%（是纯WO 3的3倍以上）。降解动力学数据符合Langmuir-Hinshelwood（L-H）动力学模型。此外，70%-Bi 2S 3-WO 3复合材料的动力学速率是纯WO 3的9倍。通过沉积Bi 2S 3对WO 3进行改性，可以提高WO 3的比表面积和可见光利用率，从而改善WO 3的电荷分离和电荷转移。这些有利因素使得Bi 2S 3-WO 3复合材料的可见光催化性能显著增强，并且在循环实验中具有优异的稳定性。最后，根据能带位置的计算，初步探讨了Bi 2S 3-WO 3复合材料光催化活性增强的机理。
Novel hierarchical micro/nanostructured photocatalysts composed of WO3microspheres and needle-like Bi2S3nanocrystals were successfully synthesized by a simple combination of hydrothermal and post-calcination method. The as-obtained Bi2S3-WO3composites was applied for photocatalytic removal of Rhedamine B (RhB) organic pollution in water under visible light irradiation. The morphology and structure of the as-obtained samples were characterized by XRD, SEM, TEM, N2adsorption–desorption techniques, UV–vis DRS, XPS and PL spectra. It was found that 70%-Bi2S3-WO3has the highest photocatalytic activity and more than 90% (over 3 times than pure WO3) of the RhB solution were degraded in 100 min. The degradation kinetics data were found to be consistent with the Langmuir-Hinshelwood (L-H) kinetics model. Furthermore, the kinetic rate of 70%-Bi2S3-WO3composites is 9 times more than the pure WO3. The modification of WO3by deposited Bi2S3could improve charge separation and transfer with the increase of special surface area and higher utilization of visible light. These favorable factors lead to significantly enhanced visible photocatalytic performance; and Bi2S3-WO3composites had an excellent stability in cycling experiments. At last, a tentative mechanism of enhanced photocatalytic activity for Bi2S3-WO3composite was discussed according to the calculation of the energy band position.