Facile construction of novel direct solid-state Z-scheme AgI/BiOBr photocatalysts for highly effective removal of ciprofloxacin under visible light exposure: Mineralization efficiency and mechanisms
Facile construction of novel direct solid-state Z-scheme AgI/BiOBr photocatalysts for highly effective removal of ciprofloxacin under visible light exposure: Mineralization efficiency and mechanisms
复制标题
轻松构建新型直接固态 Z 型 AgI/BiOBr 光催化剂，可在可见光照射下高效去除环丙沙星：矿化效率和机制
DOI：
10.1016/j.jcis.2018.03.056
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发表时间：
2018
影响因子：
9.9
通讯作者：
Zeng Guangming
中科院分区：
文献类型：
--
作者：
Yu Hanbo;Huang Binbin;Wang Hou;Yuan Xingzhong;Jiang Longbo;Wu Zhibin;Zhang Jin;Zeng Guangming
采用溶剂热沉淀法制备了Z型AgI/BiOBr复合光催化剂，并以环丙沙星（CIP）为降解对象，考察了其光催化活性.采用XRD、XPS、SEM、TEM、BET、UV-Vis吸收光谱和光致发光光谱（PL）等测试手段对催化剂的晶型、形貌、光响应、表面结构和电化学性能进行了表征。优化后的AgI（20wt%）/BiOBr复合材料具有良好的光催化活性和对CIP的快速降解能力，在1h内对CIP的去除率可达90.9%，明显优于纯BiOBr（58.6%）和纯AgI（4.6%）以及在相同条件下它们的简单混合物（31.4%），表明杂化材料中的协同效应。同时，CIP有效地矿化，所揭示的总有机碳（TOC）去除效率约。90%，在2小时内，这是进一步证实了由3D EEM测量。活性物种捕集和电子自旋共振（ESR）实验表明，自由基dotO 2-、h+和自由基dotOH均参与了CIP的光降解过程。AgI/BiOBr复合材料具有较高的氧化还原电位和更有效的载流子分离，其光催化机理可以通过考虑Z型结构得到合理的解释。此外，由于AgI的光敏化作用，杂化材料具有更宽的光响应范围，这也是杂化材料具有上级光催化活性的原因之一。本文报道了一种制备Z型AgI/BiOBr复合光催化剂的新方法，为CIP的矿化提供了一种有效的方法。
A novel Z-scheme AgI/BiOBr hybrid photocatalyst was successfully synthesized by a solvothermal-precipitation method, and its photocatalytic activity was evaluated by the degradation of ciprofloxacin (CIP, a typical antibiotic). The crystallization, morphology, photo-response, surface structure and electrochemical properties of the as-obtained photocatalyst were characterized by XRD, XPS, SEM, TEM, BET, UV–Vis absorption spectroscopy and photoluminescence spectra (PL) measurements, respectively. The optimized AgI(20 wt%)/BiOBr composite exhibited a remarkable photocatalytic activity and a rapid degradation ability for CIP with a removal efficiency of 90.9% in 1 h, which was considerably better than those of pure BiOBr (58.6%) and pure AgI (4.6%) alone as well as their simple mixtures (31.4%) under the same conditions, suggesting an synergistic effect in the hybrid materials. Meanwhile, CIP was efficiently mineralized, as revealed by a total organic carbon (TOC) removal efficiency of ca. 90% within 2 h, which was further confirmed by the 3D EEMs measurement. The reactive species trapping and electron spin resonance (ESR) experiments demonstrated thatradical dotO2−, h+andradical dotOH all participated in the CIP photodegradation process. The photocatalytic mechanism of AgI/BiOBr composites could be rationally explained by considering the Z-scheme structure, resulting in the higher redox potential and more efficient separation of charge carriers. Moreover, the wider photo-response range induced by the photosensitization of AgI also contributed to the superior photocatalytic activity of the hybrid materials. This work reports a novel method for the facile preparation of Z-scheme AgI/BiOBr hybrid photocatalyst and provides an effective methodology for the mineralization of CIP.