State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China.
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China.
J Environ Manage. 2019 Oct 15;248:109341. doi: 10.1016/j.jenvman.2019.109341. Epub 2019 Aug 2.
In this work, we have assembled BiWO nanoparticles on the surface of honeycomb-like porous carbon skeleton (PCS) via a hydrothermal route to achieve a new type of PCS@BiWO hybrid composite photocatalysts. The PCS@BiWO hybrid structures are determined by SEM, TEM and XPS characterizations. UV-vis DRS investigation suggests an enhanced visible-light absorption of the PCS@BiWO composites. 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@BiWO hybrid composites manifest much enhanced photocatalytic performance. The 5 wt%PCS@BiWO composite manifests the highest photocatalytic activity, which is ca. 2.1 times as large as that of bare BiWO nanoparticles. This can be mainly ascribed to two factors: (1) The photogenerated electron/hole pairs in BiWO are efficiently separated due to the electron transfer between BiWO and 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.
在这项工作中，我们通过水热法将 BiWO 纳米粒子组装在蜂窝状多孔碳骨架（PCS）的表面上，从而获得了一种新型的 PCS@BiWO 杂化复合光催化剂。通过 SEM、TEM 和 XPS 表征确定了 PCS@BiWO 杂化结构。UV-vis DRS 研究表明，PCS@BiWO 复合材料具有增强的可见光吸收。瞬态光电流响应、EIS 和 PL 光谱表征表明，复合材料表现出光生电子/空穴对的有效分离。通过使用 RhB 作为模型污染物和模拟阳光作为光源来评估复合材料的光催化性能。结果表明，PCS@BiWO 杂化复合材料表现出显著增强的光催化性能。5 wt%PCS@BiWO 复合材料表现出最高的光催化活性，约为纯 BiWO 纳米粒子的 2.1 倍。这主要归因于两个因素：（1）由于 BiWO 和 PCS 之间的电子转移，BiWO 中的光生电子/空穴对得到有效分离；（2）PCS 诱导了增强的可见光吸收，并且 PCS 中的可见光激发电子也可以参与光催化反应。
