Fe(Ⅱ)/针铁矿复合系统对水中橙黄G的吸附-还原脱色研究
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国家自然科学基金资助项目(41372050)


A study of the adsorptive and reductive decolorization of the azo dye orange-colored G in aqueous solution by the Fe(Ⅱ)/goethite complexe system
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    摘要:

    系统研究了Fe(Ⅱ)/针铁矿复合系统对偶氮染料橙黄G (简称OG)的吸附-还原脱色机理,重点考察了反应条件pH值、Fe(Ⅱ)与OG摩尔比对OG还原脱色效果的影响。研究结果表明,矿物表面结合态Fe(Ⅱ)能够有效提高还原脱色反应速率;OG脱色反应非常符合准一级反应动力学方程,速率常数(k)随pH值的升高、亚铁离子吸附量的增加而显著增大;当OG初始浓度为50 mg/L、Fe(Ⅱ)与OG的摩尔比为27.0时,Fe(Ⅱ)/针铁矿复合系统对OG的去除脱色率在弱碱性条件下1 h内可达到100%。该系统对OG去除脱色的高效性是界面吸附与还原协同作用的结果。该研究可为有效应用Fe(Ⅱ)/针铁矿复合系统在缺氧环境中的污染修复提供理论指导。

    Abstract:

    In this study, the adsorptive and reductive mechanisms for decolorization of orange-colored G (OG) by Fe(Ⅱ)/goethite interfacial complex system were systematically investigated. The examined focuses were placed on the effects of pH values, and molar ratios of Fe(Ⅱ)/OG on the OG decolorization. The results show that surface-bonded Fe(Ⅱ) on goethite can effectively improve the rate of reductive decolorization. The reactions over the Fe(Ⅱ)/goethite complex system can be described well by the pseudo first-order kinetics. The increases in the solution pH and the capacity of absorbed Fe(Ⅱ) enhance the reaction rate of OG removal. Moreover, OG removal efficiency can reach 100% within 1 h in the presence of Fe(Ⅱ)/goethite complex system under basic medium condition where the Fe(Ⅱ) /OG ratio is 27.0 and the OG initial concentration is 50 mg/L. The efficient removal of OG is resultant from the synergistic effect of adsorption and reduction. The results achieved by the authors provide the theoretical guidance for pollution remediation in an anaerobic environment by effectively using the Fe(Ⅱ)/goethite complex system.

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赵丹,肖丹玲,何广平,吴宏海,2015,Fe(Ⅱ)/针铁矿复合系统对水中橙黄G的吸附-还原脱色研究[J].岩石矿物学杂志,34(1):97~102. ZHAO Dan, XIAO Dan-ling, HE Guang-ping, WU Hong-hai,2015,A study of the adsorptive and reductive decolorization of the azo dye orange-colored G in aqueous solution by the Fe(Ⅱ)/goethite complexe system[J]. Acta Petrologica et Mineralogica,34(1):97~102.

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  • 收稿日期:2014-07-03
  • 最后修改日期:2014-11-07
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  • 在线发布日期: 2015-01-20
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