Synthesis of Ag/BiVO4/rGO composite with enhanced photocatalytic degradation of triclosan.
Synthesis of Ag/BiVO4/rGO composite with enhanced photocatalytic degradation of triclosan.
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DOI：
10.1016/j.scitotenv.2019.02.027
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
Ming Li;Guanghui Xu;Zhen-Lon Guan;Yang Wang;Hongwen Yu;Yong Yu
中科院分区：
文献类型：
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作者：
Ming Li;Guanghui Xu;Zhen-Lon Guan;Yang Wang;Hongwen Yu;Yong Yu
采用水热法制备了Ag/BiVO4/还原性氧化石墨烯（rGO）三元可见光催化剂。采用XRD、SEM、HRTEM、EDS、XPS、DRS、拉曼光谱、PL、BET、光电流密度和EIS分析对优化产物进行了表征。与纯BiVO4相比，制备的三元复合材料在可见光下对污染物的光催化分解能力增强。在可见光照射下，加入1 mg/mL光催化剂的溶液中100 min后，三氯生被完全去除。反复循环试验表明，复合材料具有光稳定性和分解三氯生的可重复使用性，表明该材料可重复利用。Ag和rGO的加入促进了电荷分离，抑制了光生电子与空穴的复合，从而提高了光催化性能。采用EPR自旋捕获技术（含DMPO）对Ag/BiVO4/rGO在可见光下产生的自由基进行了鉴定，并进行了捕获实验，确定了分解三氯生光催化过程中的主要活性物质。最后，采用LC-MS/MS对7种三氯生反应中间体进行检测，并提出了可能的降解途径。
A ternary visible-light driven photocatalyst, Ag/BiVO4/reduced graphene oxide (rGO) composite was manufactured by hydrothermal strategy. The optimized products were characterized by XRD, SEM, HRTEM, EDS, XPS, DRS, Raman spectra, PL, BET, photocurrent density and EIS analysis. Compared to pure BiVO4, the fabricated ternary composite showed enhanced photocatalytic ability to decompose pollutant under visible light. Triclosan was completely removed after 100 min in solution with 1 mg/mL photocatalyst under visible light irradiation. Repeated cycle tests demonstrated the photo-stability and reusability of composite to decompose triclosan, indicating that this material could be utilized repeatedly. The upgraded photocatalytic ability was attributed to the addition of Ag and rGO, which enhanced the charge separation and inhibited the recombination of photogenerated electrons and holes. The EPR spin-trap technique (with DMPO) was performed to identify the radicals produced in Ag/BiVO4/rGO under the visible light, and trapping experiments were conducted to determine the main active species in the photocatalytic process of decomposing triclosan. Finally, seven reaction intermediates of triclosan were detected by LC-MS/MS and possible degradation routes were proposed.