Zhou Li, Cai Min, Zhang Xu, Cui Naxin, Chen Guifa, Zou Guo-Yan
Institute of Eco-environment and Plant Protection, Shanghai Academy of Agricultural Sciences Shanghai 201403 China
Shanghai Engineering Research Centre of Low-carbon Agriculture Shanghai 201403 China.
RSC Adv. 2019 Nov 4;9(61):35636-35645. doi: 10.1039/c9ra07843f. eCollection 2019 Oct 31.
To overcome the practical application limitations of AgPO such as photocorrosion and relatively low efficiency of photogenerated carrier seperation, AgPO particles were loaded onto hydrochar. The particles in the composite had a smaller crystallite size and different phase structure with more edges than pure AgPO particles. The as-prepared composite catalyst exhibited a different photocatalytic performance for sulfamethoxazole (SMX) degradation when varying the mass ratio of hydrochar and AgPO. In addition to higher SMX degradation efficiency, the composite exhibited much higher TOC degradation efficiency, recycling stability, and less-toxic intermediate production. The composites enhanced visible light response, and accelerated electron transfer and photogenerated carrier separation as well. The addition of HO to the photocatalytic system enhanced the photocatalytic activity of the composite catalyst. According to a mechanistic examination, the hole (h) is the dominant reactive species for SMX degradation. This study provides new insight into high-efficiency, low cost, and easily prepared photocatalysts for pollution removal from water.
为克服AgPO在实际应用中的局限性，如光腐蚀和光生载流子分离效率相对较低等问题，将AgPO颗粒负载到水炭上。复合材料中的颗粒具有比纯AgPO颗粒更小的微晶尺寸和不同的相结构，且边缘更多。当改变水炭与AgPO的质量比时，所制备的复合催化剂对磺胺甲恶唑（SMX）降解表现出不同的光催化性能。除了更高的SMX降解效率外，该复合材料还表现出更高的总有机碳（TOC）降解效率、循环稳定性以及毒性较小的中间产物生成。这些复合材料增强了可见光响应，同时也加速了电子转移和光生载流子分离。向光催化体系中添加羟基自由基（HO）提高了复合催化剂的光催化活性。根据机理研究，空穴（h）是SMX降解的主要活性物种。本研究为高效、低成本且易于制备的用于水污染物去除的光催化剂提供了新的见解。
