多级花状纳米CuS的制备及其催化降解性能

Synthesis and Catalytic Degradation Property of Hierarchical Flower-Shaped CuS Architectures

以氯化铜、硫脲为原料,聚乙二醇为表面活性剂,通过水热法制得纳米CuS。场发射扫描电子显微镜（FESEM）及X射线衍射仪（XRD）等表征发现,产物由厚度50 nm左右的不规则纳米片构成,呈多级花状,粒度约为6μm,属六方晶系结构。研究结果显示,该多级花状纳米CuS在H2O2辅助下,表现出理想的类芬顿催化性能,其在选取的2 h观测周期,对罗丹明B（RhB）的降解效率可达91%,且在较大的pH值变化区间410范围内,均能保持较好的催化活性与降解效果。动力学研究表明,该类芬顿体系对Rh B的催化降解反应复合准一级动力学方程。

Hierarchical flower-shaped CuS structures with diameters of 6 μm were successfully synthesized by hydrothermal method. In this reaction system,copper chloride and thiourea were used as copper and sulfur source respectively,polyethylene glycol acted as surfactant. The products were characterized by XRD and FESEM in detail. Results showed that the prepared Cu S architectures were pure hexagonal phase and composed of thin nanoflakes with thickness of 50 nm. The catalytic activity of as-synthesized Cu S was evaluated through the degradation of Rhodamine B( Rh B) with the assistance of H_2O_2. It demonstrated that the catalyst exhibited highly efficient Fenton-like catalytic performance. The degradation efficiency reached 91% after 2 h and the catalyst could keep high catalytic efficiency over a broad pH range of 4 to 10. Kinetics was studied for the degradation reaction,it turned out that this process conformed to pseudo-first-order kinetics.