【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。更多还原

【Abstract】 Photocatalytic reduction of nitrate using TiO₂ 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.更多还原