标题：Enhanced Decolorization of Orange II Solutions by the Fe(II)-Sulfite System under Xenon Lamp Irradiation作者：Zhang, Li; Chen, Long; Xiao, Mei; Zhang, Lin; Wu, Feng; Ge, Liyun

来源出版物：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 卷：52 期：30页：10089-10094 DOI：10.1021/ie400469u出版年：JUL 2013

摘要：Decolorization of Orange II by a ferrous sulfite system in aqueous solutions under a xenon lamp (350W) was investigated to determine the enhancement of decolorization efficiency under UV-vis irradiation. Orange II (10 mg L-1) was efficiently decolorized at an initial pH of 6.1 under irradiation (84% efficiency at 60 min), whereas only 15% efficiency was achieved without irradiation. Although 4 was the optimum pH for enhancing the decolorization rate by irradiation, the enhancement was more significant at an initial pH near neutral. Concentration ratios of Fe(II) to sulfite higher than the optimum ratio (about 1:10) could inhibit the decolorization rate via the scavenging effect of sulfate or hydroxyl radicals. Semibatch experiments with multiple additions of Fe(II), sulfite, and Fe(II)-sulfite, respectively, showed that sulfite was more important in improving the decolorization efficiency of Orange II at higher concentration. However, removal of total organic carbon during the semibatch reaction by the Fe(II)-sulfite system under irradiation was as poor (