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论文类型：期刊论文

发表时间：2017-03-01

发表刊物：CHEMICAL ENGINEERING JOURNAL

收录刊物：SCIE、EI

卷号：311

页面范围：378-384

ISSN号：1385-8947

关键字：Dye decolorization; Dielectric barrier discharge plasma; Activation of persulfate; Sulfate radical; Hydroxyl radical

摘要：The synergetic degradation performance of Acid Orange 7 (AO7) by dielectric barrier discharge plasma (DBDP) and persulfate (PS) was examined. Addition of PS in AO7 solution hardly degraded any AO7 in 50 min, but when DBDP was initiated over the solution surface, PS greatly enhanced the decolorization efficiency of AO7, and the improvement efficacy depended on the addition dosage of PS, the applied voltage, the air discharge gap and the gas discharge atmosphere. An increase in AO7 decolorization efficiency of 60% was obtained for AO7 solution of 5 mg/L at a PS addition dosage of 100:1 (molar ratio of PS to AO7) and a discharge power of 3.6 W, correspondingly, the decolorization rate of AO7 was accelerated by 6.7 times. The improvement on AO7 degradation mainly attributes to the enhanced production of sulfate radical (SO4-) and hydroxyl radicals (OH) which are produced from the activated PS by DBD plasma. The activators of PS were tentatively speculated as the UV irradiation and heat released in discharge channels, and hydrated electrons may also play a role in the activation process of PS. The intermediates identified by GC-MS and the TOC measurement show that addition of PS into AO7 solution had little effect on the degradation pathways of AO7, but greatly improved the mineralization of AO7, which was mainly due to the increased production of SO4- and OH. (C) 2016 Elsevier B.V. All rights reserved.