Zhu Zhijia, Wang Chunmeng, Liang Lijuan, Yu Dan, Sun Jie, Zhang Lishan, Zhong Shan, Liu Baojiang
College of Chemistry, Chemical Engineering & Biotechnology, Donghua University, Shanghai 201620, China.
Zhejiang Province New Textile Research & Development Emphasised Laboratory, Hangzhou 310009, China.
J Nanosci Nanotechnol. 2020 Apr 1;20(4):2247-2258. doi: 10.1166/jnn.2020.17368.
Novel nanocomposites of Ag₃PO₄/Bi₂WO/MWCNTs were prepared via a facile hydrothermal method and precipitation without the addition of any spherical template. The composites exhibited excellent catalytic activity under visible-light irradiation. Compared with pure Ag₃PO₄, Bi₂WO, Bi₂WO/MWCNTs, and Ag₃PO₄/Bi₂WO, ternary Ag₃PO₄/Bi₂WO/MWCNTs nanocomposites showed the best photocatalytic performance due to the narrow band gap, large specific surface area, high charge separation efficiency, and strong light absorbance in the visible region. Degradation experiments involving norfloxacin (NOR) antibiotics under visible-light irradiation confirmed ideal photocatalytic activity of Ag₃PO₄/Bi₂WO/MWCNTs nanocomposites. Degradation products of NOR were identified via LC-MS/MS analysis, and a potential photodegradation mechanism of NOR was discussed; results indicated that these antibiotics could be degraded via three pathways. The piperazinyl ring was the most reactive site for hydroxyl radical attacks, followed by stepwise oxidation and further ring-opening. Overall, the composites appear to be promising materials for removing contaminants from water.
通过简易水热法和沉淀法，在不添加任何球形模板的情况下制备了新型Ag₃PO₄/Bi₂WO/MWCNTs纳米复合材料。该复合材料在可见光照射下表现出优异的催化活性。与纯Ag₃PO₄、Bi₂WO、Bi₂WO/MWCNTs和Ag₃PO₄/Bi₂WO相比，三元Ag₃PO₄/Bi₂WO/MWCNTs纳米复合材料由于带隙窄、比表面积大、电荷分离效率高以及在可见光区域具有较强的光吸收能力，表现出最佳的光催化性能。在可见光照射下对诺氟沙星（NOR）抗生素进行的降解实验证实了Ag₃PO₄/Bi₂WO/MWCNTs纳米复合材料具有理想的光催化活性。通过LC-MS/MS分析确定了NOR的降解产物，并讨论了NOR潜在的光降解机制；结果表明这些抗生素可通过三种途径降解。哌嗪环是羟基自由基攻击的最活跃位点，随后是逐步氧化和进一步开环。总体而言，这些复合材料似乎是用于去除水中污染物的有前途的材料。
