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采用化学共沉淀法制备了稀土Ce/SnO_2光催化剂,以XRD、SEM等测试手段对其进行晶型、粒径、形貌等的表征。催化剂为四方晶系金红石结构,平均粒径在40~50 nm之间。在可见光条件下,用制备的光催化剂降解模拟水产养殖废水中的NH4-N,实验结果表明,对NH_4-N去除效果的影响顺序为:Ce的掺杂比>煅烧温度>NH_4-N初始浓度>催化反应时间>催化剂投加量。根据正交以及验证实验,光催化降解最优反应条件为:Ce/SnO_2投加量为0.8 g/L,Ce掺杂量为1.0%,煅烧温度为500℃,NH_4-N初始浓度为50mg/L,催化反应时间为2 h。NH_4-N去除率可以达到92.7%。
The rare earth Ce / SnO 2 photocatalyst was prepared by chemical coprecipitation method. Its crystal structure, particle size and morphology were characterized by XRD and SEM. The catalyst is tetragonal rutile structure, the average particle size of 40 ~ 50 nm. Under visible light conditions, the prepared photocatalyst was used to degrade NH4-N in simulated aquaculture wastewater. The experimental results showed that the order of influence on NH4-N removal efficiency is Ce doping ratio> calcination temperature> initial concentration of NH4N > Catalytic reaction time> catalyst dosage. According to the orthogonal and validation experiments, the optimal reaction conditions for photocatalytic degradation were: Ce / SnO 2 dosage 0.8 g / L, Ce doping 1.0%, calcination temperature 500 ℃, NH 4 -N initial concentration 50 mg / L, the catalytic reaction time is 2 h. NH_4-N removal rate can reach 92.7%.