Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode
Peroxi-coagulation degradation of C.I. Basic Yellow 2 based on carbon-PTFE and carbon nanotube-PTFE electrodes as cathode
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DOI：
10.1016/j.electacta.2009.06.060
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发表时间：
2009-11
影响因子：
6.6
通讯作者：
M. Zarei;D. Salari;Aligoli Niaei;A. Khataee
中科院分区：
文献类型：
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作者：
M. Zarei;D. Salari;Aligoli Niaei;A. Khataee
以碳-聚四氟乙烯(PTFE)和碳纳米管(CNT)-PTFE电极为阴极，研究了含C.I.碱性黄2(BY2)水溶液的电化学处理。用扫描电子显微镜(SEM)和原子力显微镜(AFM)对制备的电极进行了表征。研究了这些电极表面电生成的过氧化氢的量。结果表明，碳纳米管-聚四氟乙烯电极的过氧化氢生成量是碳-聚四氟乙烯电极的近3倍。在100 mA下，碳-聚四氟乙烯电极和碳纳米管-聚四氟乙烯电极在前10min内对BY2的脱色率分别达到62%和96%。考察了外加电流、初始pH、染料初始浓度等操作参数对脱色效果的影响，以期获得较高的脱色效率。利用碳纳米管-聚四氟乙烯电极对BY2进行了降解和矿化，并进行了总有机碳(TOC)和GC-MS分析。TOC测试结果表明，在相同的条件下，碳-聚四氟乙烯的过氧化混凝可使81%的矿化度达到81%，而碳纳米管-聚四氟乙烯的过氧化混凝可使92%的矿化达到92%。GC-MS分析证实了中间体的真实性，并提出了基于中间体的反应路径。
The electrochemical treatment of solutions containing C.I. Basic Yellow 2 (BY2) in aqueous solutions with carbon-PTFE (polytetrafluoroethylene) and carbon nanotube (CNT)-PTFE electrodes as cathode has been studied. The fabricated electrodes were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The amount of electrogenerated H2O2on the surface of these electrodes was investigated, too. The results showed that the amount of H2O2obtained with the CNT-PTFE electrode was nearly three times higher than that of carbon-PTFE electrode. The decolorization efficiency of BY2 in peroxi-coagulation process reached 62% and 96% in the first 10min by carbon-PTFE and CNT-PTFE electrodes at 100mA, respectively. The effect of operational parameters such as applied current, initial pH and initial dye concentration was studied in an attempt to reach higher decolorization efficiency. The degradation and mineralization of BY2 using CNT-PTFE electrode were followed by total organic carbon (TOC) and GC–MS analysis. The results of TOC measurements indicated that peroxi-coagulation with carbon-PTFE allowed 81% mineralization after 6h of electrolysis; whereas peroxi-coagulation with CNT-PTFE yields 92% mineralization under the same conditions. GC–MS analysis verified the identity of intermediates and a reaction pathway based on them was proposed.