Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution
作者： T VELEGRAKI , I POULIOS , M CHARALABAKI , N KALOGERAKIS , P SAMARAS
DOI: 10.1016/J.APCATB.2005.07.007
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摘要: Abstract The oxidation of 50 mg/L azodye acid orange 7 (AO7) in water was investigated by means photocatalysis the presence various semiconducting catalysts and ultrasound irradiation. UVA-induced photocatalytic degradation over TiO2 anatase suspensions found to increase with increasing catalyst concentration, decreasing solution pH, as well dissolved oxygen. 1,4-benzoquinone, sodium azide or chloride reaction mixture decreased due scavenging radicals other reactive moieties. Interestingly, addition hydrogen peroxide at concentrations from 21 1050 mg/L also inhibited degradation. sonochemical AO7 frequency temperature. Under similar treatment conditions, irradiation resulted higher conversion than photocatalysis; moreover, sonochemically irradiated consistently contained low aliphatic intermediates, while photocatalytically treated mainly consisted aromatic intermediates confirmed GC–MS analysis. acute toxicity marine bacteria V. fischeri following either process. Furthermore, deep slightly improved aerobic biodegradability assessed shake flask tests.
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