Cerium doped zinc oxide nano-scale particles was prepared by precipitation method, the properties including structure, morphology and composition were characterized by BET, XRD, SEM, ICP-AES, UV-Vis DRS and FT-IR. A new type of internal immersed irradiation photocatalytic degradation mode was proposed, relationship between liquid layer thickness and light transmittance was investigated. Finally, The conditions of photocatalytic degradation of rhodamine B were optimized, and the kinetics and mechanism were studied. Results showed that the optimum doped ratio and calcination temperature were 3%(n:n) and 500℃ for 2h, respectively. Catalyst particles was sphere appearance with an average diameter distribution of 80~100nm, and with BET specific surface area of 12.9m2/g, the content of doped cerium determined by ICP-AES accorded with theoretical value. The enhancement of catalytic activity was mainly due to the increase of light absorption after cerium doping. The shielding effect of suspension suggested a significant attenuation on light transmittance, light attenuation rate of UV254 was twice more than that of homogeneous solution when the catalyst concentration was 0.1g/100mL. It was applied to rhodamine B with concentration of 1.0×10-5mol/L, the degradation rate reached to 92.5% in 70min when UV lamp power was 15W, pH value was 7, 30℃ and catalyst dosage was 0.1g/250mL, and the degradation rate was up to 80% even after 6 recycle, it followed first-order kinetic equation and the reaction rate constant was 0.05min-1.
张凯龙, 施妙艳, 倪貌貌, 陈佳祎, 汤淑利, 谭志文. 优化内浸式Ce掺杂ZnO光催化降解罗丹明B[J]. 中国环境科学, 2019, 39(4): 1447-1455.
ZHANG Kai-long, SHI Miao-yan, NI Mao-mao, CHEN Jia-yi, TANG Shu-li, TAN Zhi-wen. Optimization of internal immersed irradiation and photocatalytic degradation of rhodamine B with Ce doped ZnO particles. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1447-1455.
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