UV光源波长对TiO2光催化还原硝酸盐行为的影响  

Effects of UV Light Wavelength on Photocatalytic Reduction Behavior of Nitrate Using TiO2

作　　者：易志刚[1] 江滔[1] 成英[1] 杨孝容[1] 唐琼[1] YI Zhigang;JIANG Tao;CHENG Ying;YANG Xiaorong;TANG Qiong(School of Chemistry and Resources Environment,Leshan Normal University,Leshan Sichuan 614000,China)

机构地区：[1]乐山师范学院化学与资源环境学院,四川乐山614000

出　　处：《乐山师范学院学报》2020年第8期27-32,共6页Journal of Leshan Normal University

基　　金：国家自然科学青年基金“在超声波辅助下的生物催化原油脱硫的作用机制”(21507052);四川省科技厅科技支撑计划项目“基于上转换纳米粒子的近红外光响应光催化材料的制备及光催化性能研究”(2017RZ0035);乐山师范学院科技资助项目“光催化还原水体中硝酸盐的过程中增强氮气产物选择性的影响因素研究”(205190134)。

摘　　要：以TiO2为催化剂、中压汞灯和UV-LED灯为光源,文章研究了不同波长光源辐照对硝酸盐光催化还原行为的影响。结果表明:硝酸盐光催化还原反应在中压汞灯和UV-LED灯[(285+300+365)nm组合)]的辐照下均为准一级动力学反应;相同光子通量条件下,UV-LED光源辐照时硝酸盐的去除率和氮气产物的选择性均优于中压汞灯;通过对辐照光源波长的调控,可以提高硝酸盐光催化还原去除率和氮气产物的选择性。Photocatalytic reduction of nitrate using TiO 2 as photocatalyst,medium pressure mercury lamp and UV-LED as light source was studied,respectively.The results showed that the photocatalytic reduction data of nitrate under medium pressure mercury lamp and(285+300+365)nm UV-LED fitted with the pseudo-first order kinetics.Under the same photon flux condition,the removal ratio of nitrate and the selectivity of nitrogen products for UV-LED were better than that for medium-pressure mercury lamps.The removal ratio of nitrate and the selectivity of nitrogen products could be improved by adjusting the wavelength of the light source.

关 键 词：光催化还原 二氧化钛 紫外光源 硝酸盐 

分 类 号：O611.65[理学—无机化学]