不同酸介质对TiO2光催化还原Cr(Ⅵ)体系的影响

The effect of different acidic medium on potocatalytic reduction of Cr(Ⅵ)

摘要: 研究了不同酸介质对TiO2光催化还原低浓度Cr(Ⅵ)体系的影响,发现在110 W紫外灯3、h照射条件下Cr(Ⅵ)质量浓度低于20μg/mL时受空白影响大.通过在无TiO2光催化剂的空白实验,表明在HCl介质中不用考虑空白带来的影响,而H2SO4,HNO3,CH3COOH均有不可忽略的影响.

Abstract: The effect of different acidic medium on the activity for the photocatalytic reduction of Cr(Ⅵ)with TiO2was studied,especially for the low concentration of Cr(Ⅵ).It was found that blank test effect was significant when Cr(Ⅵ)concentration was below 20μg/mL under UV light irradiation 110 W and 253.7 nm.The blank test also indicated that without TiO2,the UV light has negligible effect on the reduction of Cr(Ⅵ)when HCl was used as acidic medium,whereas UV light has significant effect when HNO3,CH3COOH,and H2SO4was used.