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三种邻苯二甲酸酯在不同黏土矿物上的吸附

DOI: 10.11654/jaes.2015.06.013

Keywords: 邻苯二甲酸酯类 黏土矿物 吸附 解吸

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Abstract:

邻苯二甲酸酯类(PAEs)作为一类常见的增塑剂可以通过多种途径进入土壤, 并在土壤中富集。黏土矿物是土壤的一个重要组分, 对有机污染物的迁移有重要的作用。通过考察三种PAEs,即邻苯二甲酸二甲酯(DMP)、邻苯二甲酸二乙酯(DEP)和邻苯二甲酸正丁酯(DnBP)在改性之后的K+饱和黏土矿物(K-FZ-10,K-SMF和K-Kao)上的吸附行为, 分析了黏土矿物类型、PAEs种类以及温度对吸附的影响。试验结果能较好地用Freundlich方程进行拟合, 结果表明:PAEs的疏水性越强, 固相-水分配系数(Kd)越大, PAEs越容易被黏土矿物吸附;三种PAEs在黏土矿物上的吸附量均呈现DMP+饱和黏土矿物对PAEs的吸附能力均是K-FZ-10>K-SMF>K-Kao,其与黏土矿物的表面积呈正相关。不同温度(4、10、20 ℃和30 ℃)的试验结果表明, 黏土矿物对三种PAEs的吸附量随温度升高而减少。黏土矿物的类型、PAEs的疏水性和温度对PAEs在黏土矿物上的吸附均有显着影响, 即黏土矿物表面积越大, PAEs的疏水性越强, 环境温度越低, PAEs的吸附量越大, 表明这三种因素对PAEs在土壤中的迁移起重要作用

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