Photocatalytic removal of toxic Hg(II) ions using TiO_2-mociifiecl bamboo charcoal as photocatalyst

摘要

Photocatalytic removal of mercury was studied using TiO_2-modified bamboo charcoal prepared with Sol-Gel method as photocatalyst, and formate as hole scavengers under UV irradiation. In the absence of formate additives, approximately 95% of 30 mg/L Hg(II) ions was found to be removed from the solution by adsorption. Addition of formate resulted in the photoreduction of Hg(II) to its metallic form. The best conditions of Hg(II)-containing wastewater treatment were determined. The results show that the optimum amount of photocatalyst was 4 g/L,the optimum illumination time was 30 min,reached a plateau value at pH 6, the photocatalyst calcinated for 2h at 500 °C. and the optimum formate addition amount was found to be 120mg/L, which doubled the adsorption capacity. Accordingly, it is believed that the method developed in this study is effective and practical in industrial wastewater treatment for Hg(II) disposal.