【摘要】 为了优化Cu₂O纳米粒子的光催化性能,以抗坏血酸作为还原剂、聚乙烯吡咯烷酮为表面活性剂,采用水相合成的方法通过调控反应温度制备出杂化Cu₂O/Cu纳米粒子。利用SEM、XRD和N₂吸附技术对Cu₂O/Cu纳米粒子的形貌特征和结构性能进行表征。同时,也研究Cu₂O/Cu纳米粒子催化降解甲基橙（MO）的效果和降解反应动力学。结果表明,制备的杂化Cu₂O/Cu纳米粒子为"鹅卵石"形状,粒径尺寸范围在20⁴0 nm之间,与纯Cu₂O粒子相比,杂化Cu₂O/Cu粒子具有尺寸小、比表面积大的特点。由于杂化材料中引入了Cu纳米粒子,促进了Cu和Cu₂O之间的界面电荷转移,使得Cu₂O/Cu纳米粒子展现更优异的催化性能。Cu₂O/Cu催化降解MO的反应符合一级动力学反应模型。经过4次循环使用后,杂化Cu₂O/Cu仍然能表现出良好的催化活性。更多还原

【Abstract】 Heterogeneous Cu₂O/Cu nanoparticles were synthesized by a colloidal chemistry approach using ascorbic acid as a reducing agent and polyvinylpyrrolidone as a surfactant. Morphology and structure of Cu₂O/Cu nanoparticles were analyzed by SEM, XRD and N₂ sorption techniques. The catalytic performances of Cu₂O/Cu nanoparticles for the degradation of methyl orange（MO） were investigated and reaction kinetics of MO degradation over the catalyst was also studied. The results show that the heterogeneous Cu₂O/Cu nanoparticles display cobblestone-like morphology with particle sizes ranging from 20 nm to 40 nm, which are slightly smaller in particle size and higher in BET surface areas than pure Cu₂ O. The Cu₂O/Cu nanoparticles demonstrate good potential on degradation of MO because Cu nanoparticles in the Cu₂O/Cu heterostructures promote the interfacial charge-transfer kinetics between Cu and Cu₂ O. High initial MO concentration produces low degree of MO degradation, and increases the reaction time to reach equilibrium, and the degradation reactions follow the pseudo-first-order kinetics model. The Cu₂O/Cu catalyst still exhibit good catalytic activity after 4 photodegradation cycles of MO solutions.更多还原