Degradation of organic dyesin aqueous solution by nano-scaled α-Fe2O3 activated peroxymonosulfate.

To solve the problem of difficult recovery, high toxicity, serious restraint on reaction pH of traditional catalyst in advanced oxidation processes based on sulfate radical (SO₄^-), nano-scaled α-Fe₂O₃ was chosen as novel catalyticmaterial. The effects of different influence factors on the degradation of acid orange (AO) II by activation of hydrogen peroxide with nano α-Fe₂O₃ were investigated. The results show that the removal rate of organic dyes AO II has positive correlation with oxidant and catalyst dosages, and the corresponding k_obs value linearly increases with catalyst dosage, the degradation efficiency of AO II is inhibited in actual waters. The mineralization rate of AO II in α-Fe₂O₃/PMS system is relatively low, most of the removed AO II is degraded to intermediate products. Nano-scaled α-Fe₂O₃ is confirmed to be a recyclable catalyst with high catalytic performance and low toxcity. [ABSTRACT FROM AUTHOR]