Rapid decolorization of azo dye methyl orange in aqueous solution by nanoscale zerovalent iron particles
Rapid decolorization of azo dye methyl orange in aqueous solution by nanoscale zerovalent iron particles
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DOI：
10.1016/j.jhazmat.2008.11.091
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发表时间：
2009-07-30
影响因子：
13.6
通讯作者：
Fan, Maohong
中科院分区：
文献类型：
--
作者：
Fan, Jing;Guo, Yanhui;Fan, Maohong
偶氮染料是难降解的污染物，对环境构成重大负担。研究了化学合成纳米零价铁（NZVI）对水溶性偶氮染料甲基橙子（MO）的脱色作用。系统地研究了染料初始浓度、铁离子投加量、溶液pH值和温度等实验变量。实验结果表明，随着NZVI投加量的增加和反应温度的升高，脱色率提高。进一步研究表明，无机盐（Na（2）SO（4））的存在会抑制MO的脱色。动力学分析表明，脱色过程符合一级指数衰减动力学模型。活化能为35.9 kJ/mol。(C)2008 Elsevier B. V.保留所有权利。
Azo dyes are recalcitrant and refractory pollutants that constitute a significant burden on the environment. The report here is focused on the decolorization treatment of water soluble azo dye methyl orange (MO) by chemically synthesized nanoscale zerovalent iron (NZVI) particles. Experimental variables such as initial dye concentration, iron dosage, solution pH and temperature were studied systematically. Batch experiments suggest that the decolorization efficiency was enhanced with the increase of NZVI dosage and reaction temperature. but decreased with increasing initial dye concentration and initial solution pH. Further studies indicated that existence of inorganic salt (Na(2)SO(4)) could inhibit the decolorization of MO. Kinetic analyses based on the experimental data elucidated that the decolorization process followed a first order exponential decay kinetics model. The activation energy was determined to be 35.9 kJ/mol. (C) 2008 Elsevier B.V. All rights reserved.