石墨烯桥联的ZnO/Ag3PO4复合材料的制备及其对环丙沙星的降解性能

采用沉淀沉积法制备了石墨烯桥联的ZnO/Ag₃PO₄复合光催化材料，具有优异的可见光催化性能，通过XRD、XPS、SEM、EDS、BET、FTIR、UV-Vis DRS、PL及ESR等表征手段对其晶体结构、形貌、光学性质等进行了表征及分析，并研究了不同氧化石墨烯比例的GO-ZnO/Ag₃PO₄复合材料对模拟抗生素废水环丙沙星(CIP)的光催化降解性能。由于GO及ZnO的引入，不仅增强了GO-ZnO/Ag₃PO₄对可见光吸收，且拥有了更高的电子-空穴对的分离效率。当GO与Ag₃PO₄的质量比为1%时，GO-ZnO/Ag₃PO₄显示出最佳的光催化活性，60 min可见光照后对CIP降解率可达85.3%。捕获实验表明，超氧自由基(·O₂?)是反应过程中的主要活性物质，ZnO与Ag₃PO₄之间形成了异质结，符合Z型电子转移机制，GO的引入进一步提高了电子的快速转移，并使Z型体系更加稳定。经过6次光催化循环，降解率依然保持在70%以上，表明GO-ZnO/Ag₃PO₄复合材料具有优异的稳定性。 

Preparation of graphene bridged ZnO/Ag3PO4 composite and its degradation performance for ciprofloxacin

Graphene-bridged ZnO/Ag₃PO₄ composite photocatalytic material, with excellent visible light catalytic performance, was prepared with the method of precipitation and deposition. Some characterization methods, includingXRD, XPS, SEM, EDS, BET, FTIR, UV-Vis DRS, PLand ESR were adopted to characterize and analyze the crystal structure, morphology, and optical properties of ZnO/Ag₃PO₄ composite photocatalytic material. Meanwhile, the photocatalytic degradation performance of GO-ZnO/Ag₃PO₄ with different ratios of graphene oxideto simulation antibiotics wastewater ciprofloxacin (CIP) was explored. The introduction of GO and ZnO enhances the visible light absorption of GO-ZnO/Ag₃PO₄, and makes GO-ZnO/Ag₃PO₄ have better separation efficiency of electron-hole pairs. When the mass fraction of GO is 1wt%, GO-ZnO/Ag₃PO₄ displays the best photocatalytic activity, and the degradation rate of CIP can reach 85.3% after 60 minutes of visible light. The capture experimentprove that, in the reaction process, superoxide radical (·O₂–) is the main active substance, and a heterojunction is formed between ZnO and Ag₃PO₄, which conforms to the Z-scheme electron transfer mechanism. The introduction of GO furtherly improves the rapid transfer of electrons and makes the Z-scheme system more stable. After six photocatalytic cycles, the degradation rate remained above 70%, indicating that the GO-ZnO/Ag₃PO₄ composite material has excellent stability.