CoTiO<sub>3</sub>光催化-类Fenton协同反应降解土霉素的研究

CoTiO₃光催化-类Fenton协同反应降解土霉素的研究

摘要: 采用溶胶-凝胶法成功制备CoTiO₃纳米粒子样品，并采用X射线衍射（XRD）、扫描电子显微镜（SEM）以及紫外-可见光（UV-vis）反射等方法对样品进行表征与分析。以CoTiO₃作为催化剂，过硫酸氢钾（PMS）为氧化剂，构建CoTiO₃/PMS体系，研究CoTiO₃用量、PMS浓度、反应温度和体系pH值对土霉素降解效果的影响。结果表明：当CoTiO₃为0.2 g，PMS浓度为5 mmol/L，温度为45℃时，CoTiO₃/PMS体系光照40 min后土霉素的降解率最高可达94.9%，表现出明显的光催化-类Fenton协同作用。

Abstract: CoTiO₃ nanoparticles were successfully synthesized by sol-gel method, and the samples were characterized and anglyzed with X ray diffractometer(XRD), scanning electron microscope (SEM) and ultraviolet-visible (UV-vis)diffuse reflection, respectively. CoTiO₃/PMS system was constructed with CoTiO₃ as the catalyst, peroxymonosulfate (PMS) as oxidant. The effects of the amount of CoTiO₃, PMS concentration, reaction temperature and pH value of the system on the degradation of oxytetracycline were investigated. The results show that when the amount of CoTiO₃ is 0.2 g, PMS concentration is 5 mmol/L, and the temperature is 45℃, the degradation rate of oxytetracycline in CoTiO₃/PMS system can reach 94.9% after 40 min of illumination, showing obvious synergistic effect of Fenton and photocatalysis.