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富里酸和胡敏酸在蒙脱石上的吸附特性

张立超 包先明 余福波 何玉婷 钱亚利 欧金萍

张立超, 包先明, 余福波, 何玉婷, 钱亚利, 欧金萍. 富里酸和胡敏酸在蒙脱石上的吸附特性[J]. 环境科学研究, 2013, 26(12): 1333-1339.
引用本文: 张立超, 包先明, 余福波, 何玉婷, 钱亚利, 欧金萍. 富里酸和胡敏酸在蒙脱石上的吸附特性[J]. 环境科学研究, 2013, 26(12): 1333-1339.
ZHANG Li-chao, BAO Xian-ming, YU Fu-bo, HE Yu-ting, QIAN Ya-li, OU Jin-ping. Studies on the Adsorption Mechanisms of Fulvic Acid and Humic Acid on Smectite[J]. Research of Environmental Sciences, 2013, 26(12): 1333-1339.
Citation: ZHANG Li-chao, BAO Xian-ming, YU Fu-bo, HE Yu-ting, QIAN Ya-li, OU Jin-ping. Studies on the Adsorption Mechanisms of Fulvic Acid and Humic Acid on Smectite[J]. Research of Environmental Sciences, 2013, 26(12): 1333-1339.

富里酸和胡敏酸在蒙脱石上的吸附特性

基金项目: 安徽省自然科学基金面上项目(1308085MB28);国家水体污染控制与治理科技重大专项(2012ZX07103-005);国家自然科学基金项目(31300422)

Studies on the Adsorption Mechanisms of Fulvic Acid and Humic Acid on Smectite

  • 摘要: 为进一步揭示有机污染物在黏土矿物上的迁移转化规律,运用1H核磁共振光谱、高效体积排阻色谱、扫描电镜、比表面分析以及傅里叶变换红外光谱等多种分析技术综合分析了富里酸和胡敏酸在蒙脱石上的吸附行为. 结果表明,由于不同官能团与蒙脱石的亲和性不同,富里酸和胡敏酸在吸附过程中均产生组分分级,大分子被优先吸附在蒙脱石表面. 由于疏水性作用,蒙脱石对疏水性更强的胡敏酸的吸附量更大. 蒙脱石吸附富里酸后比表面积和孔容分别下降3.67m2/g和0.005cm3/g,而吸附胡敏酸后则均略微增大,说明具有较大颗粒尺寸的胡敏酸更多地堆积在蒙脱石外表面,而富里酸则更易进入蒙脱石孔隙. 蒙脱石吸附富里酸和胡敏酸后溶液pH分别升高了0.44和0.41,说明发生了配体交换反应. 蒙脱石对富里酸和胡敏酸的吸附量随pH增大和离子强度的降低而减少,表明羟基能够抑制富里酸/胡敏酸负电基团与蒙脱石表面羟基的配体交换反应,而盐离子则能降低蒙脱石和腐殖质间的静电斥力.

     

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出版历程
  • 收稿日期:  2013-06-05
  • 修回日期:  2013-09-10
  • 刊出日期:  2013-12-25

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