高铁酸钾与UV-vis/TiO_2协同氧化效应的研究

Study on the coordinative oxidation effect of ferrate and UV-vis/TiO_2

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30 min,氨氮质量浓度50 mg/L,高铁酸钾、TiO2投加质量浓度分别为20、200 mg/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。

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/TiO2 photo-catalytic system alone and the combination of ferrate and UV-vis/TiO2,have been studied. The results show that the optimal conditions for ferrate/ UV-vis/TiO2 system.combination are： at room temperature,the oxidation time 30 min, pH=8.0, NH3-N 50 mg/L, the dose of TiO2 200 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/TiO2 alone,the removal rates are 22.5% and 14.7% higher respectively. The results also show that low concentrated ferrate/UV-vis/TiO2 photo-catalytic system has coordinative oxidation effect, but highly concentrated ferrate/UV-vis/TiO2 photo-catalytic system has inhibitive effect.