[Degradation of toxic organic pollutants by soil catalysis under visible irradiation]

Natural Soil was used as catalyst to degrade Sulforhodamine B (SRB) and 2,4-Dichlorophenol(DCP) under visible irradiation (vis, lambda > 420 nm). The influences of [Soil] and [H2O2]0 on degradation were analysed, and the reaction kinetics and mechanism of degradation were studied by UV-Vis, fluorescence spectra and IR. Results indicated, SRB can be degraded availably by chosen Soil/H2O2/vis system. Depigmentation can complete in 240 min,COD was removed by 90.44% in 10 h,and DCP was removed by 80.55% in 240 min. Fluorescence spectra results show that highly active oxide species *OH was produced in the reaction. IR results indicate SRB was degraded to small molecular, such as amine substances and carbonyl compounds. Catalyst activity did not exhibit any significant loss after used 5 recycles. Degradation mechanism is heterogeneous Fenton-like process related with *OH.