Enhanced photocatalytic performance by hybridization of Bi2WO6 nanoparticles with honeycomb-like porous carbon skeleton
Enhanced photocatalytic performance by hybridization of Bi2WO6 nanoparticles with honeycomb-like porous carbon skeleton
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Bi2WO6纳米粒子与蜂窝状多孔碳骨架的杂化增强光催化性能
DOI：
10.1016/j.jenvman.2019.109341
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发表时间：
2019
影响因子：
8.7
通讯作者：
Wang Xiangxian
中科院分区：
文献类型：
--
作者：
Wang Siyuan;Yang Hua;Yi Zao;Wang Xiangxian
本工作采用水热法将Bi 2 WO 6纳米粒子组装到蜂窝状多孔碳骨架（PCS）表面，制备了一种新型的PCS@Bi2WO6杂化复合光催化剂。通过SEM、TEM和XPS表征了PCS@Bi2WO6杂化结构。UV-vis DRS研究表明PCS@Bi2WO6复合材料的可见光吸收增强。瞬态光电流响应，EIS和PL光谱表征表明，该复合材料表现出光生电子/空穴对的有效分离。以罗丹明B为模型污染物，模拟太阳光为光源，对复合材料的光催化性能进行了评价。结果表明，PCS@Bi2WO6杂化复合材料的光催化性能明显提高。其中，5wt%PCS@Bi_2WO_6复合材料的光催化活性最高，约为100%。2.1是裸Bi_2 WO_6纳米颗粒的10倍。这主要归因于两个因素：（1）Bi 2 WO 6与PCS之间的电子转移有效地分离了Bi 2 WO 6中的光生电子/空穴对;（2）PCS增强了可见光吸收，可见光激发的电子也参与了光催化反应。
In this work, we have assembled Bi2WO6nanoparticles on the surface of honeycomb-like porous carbon skeleton (PCS) via a hydrothermal route to achieve a new type of PCS@Bi2WO6hybrid composite photocatalysts. The PCS@Bi2WO6hybrid structures are determined by SEM, TEM and XPS characterizations. UV–vis DRS investigation suggests an enhanced visible-light absorption of the PCS@Bi2WO6composites. Transient photocurrent response, EIS and PL spectroscopy characterizations demonstrate that the composites exhibit an efficient separation of photoproduced electron/hole pairs. The photocatalytic performance of the composites were evaluated by using RhB as the model pollutant and simulated sunlight as the light source. It is revealed that the PCS@Bi2WO6hybrid composites manifest much enhanced photocatalytic performance. The 5 wt%PCS@Bi2WO6composite manifests the highest photocatalytic activity, which is ca. 2.1 times as large as that of bare Bi2WO6nanoparticles. This can be mainly ascribed to two factors: (1) The photogenerated electron/hole pairs in Bi2WO6are efficiently separated due to the electron transfer between Bi2WO6and PCS; and (2) PCS induces enhanced visible-light absorption and the visible-light-excited electrons in PCS could also take part in the photocatalytic reactions.