摘要：

为研究高铁酸钾与紫外-可见光/二氧化钛(UV-vis/TiO₂)光催化的协同氧化效应，以氨氮为目标物，研究了高铁酸钾、UV-vis/TiO₂光催化以及高铁酸钾与UV-vis/TiO₂光催化联用对水中氨氮的去除效果。结果表明，在高铁酸钾与UV-vis/TiO2光催化联用的条件下，在pH=8.0，温度为室温，反应时间为30min，氨氮质量浓度50mg/L，高铁酸钾、TiO₂投加质量浓度分别为20、200mg/L时，水中氨氮的去除率为97.5%，比单独的高铁酸钾或UV-vis/TiO₂最大去除率分别提高了22.5%和14.7%。实验还表明，低浓度的高铁酸钾与UV-vis/TiO₂光催化体系存在协同氧化效应，但高浓度的高铁酸钾对UV-vis/TiO₂光催化体系却存在抑制效应。

关键词: 高铁酸钾, 纳米TiO₂, 光催化, 氨氮

Abstract:

In order to make out the coordinative oxidation effect among ferrate and UV-vis/TiO₂,the removal rates of ammonia-nitrogen(NH₃-N)from water with ferrate alone.UV-vis/TiO₂photo-catalytic system alone and thecombination of ferrate and UV-vis/TiO₂,have been studied.The results show that the optimal conditions for ferrate/UV-vis/TiO₂system combination are:at room temperature,the oxidation time 30 min,pH=8.0,NH₃-N 50 mg/L,the dose of TiO₂200 mg/L,and the dose of ferrate 20 mg/L,the removal rate of NH₃-N could reach 97.5%.When compared with using ferrate alone and using UV-vis/TiO₂alone,the removal rates are 22.5% and 14.7% higherrespectively.The results also show that low concentrated ferrate/UV-vis/TiO₂photo-catalytic system has coordi-native oxidation effect,but highly concentrated ferrate/UV-vis/TiO₂photo-catalytic system has inhibitive effect.

Key words: ferrate, nanometertitanium dioxide, photo-catalysis, ammonia-nitrogen

中图分类号: 

• X703

• TQ034