Describing chlorophenol sorption on variable-charge soil using the triple-layer model.
Describing chlorophenol sorption on variable-charge soil using the triple-layer model.
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DOI：
10.1016/j.jcis.2005.05.074
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发表时间：
2005-12
影响因子：
9.9
通讯作者：
M. Cea;J. Seaman;Alejandra A. Jara;M. Mora;M. C. Diez
中科院分区：
文献类型：
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作者：
M. Cea;J. Seaman;Alejandra A. Jara;M. Mora;M. C. Diez
通过一系列批量实验研究了智利南部可变电荷土壤对2，4-二氯苯酚、2，4，6-三氯苯酚和五氯苯酚的吸附。在0.01MKCl2和0.1MKCl2(25 °C)两种不同离子强度下，对氯苯酚的吸附行为作为pH的函数(pH范围4-8)进行了评价。土壤对氯苯酚的吸附依赖于pH，随着氯苯酚浓度的增加，土壤PZC向下移动。氯酚的吸附随着pH的升高而降低，表明未解离物种更容易被吸附，静电斥力可能会随着pH的升高抑制分配。吸附实验数据用三层模型进行拟合，即去质子化的有机分子与可变电荷土壤上的活性中心之间形成单齿的内外球状复合体。
The sorption of 2,4-dichlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol by a variable-charge soil from southern Chile was studied in a series of batch experiments. The chlorophenol sorption behavior was evaluated as a function of pH (pH range 4–8) at two different ionic strengths, 0.01 and 0.1 M KCl (25 °C). Chlorophenol sorption depended on pH and a downward shift in the soil PZC was observed with increasing chlorophenol concentration. Chlorophenol sorption decreased with increasing pH, suggesting that the undissociated species is sorbed more readily and that electrostatic repulsion may inhibit partitioning as pH increases. Data from the sorption experiments were fitted by the triple-layer model, in which monodentate outer- and inner-sphere complexes were formed between deprotonated organic molecules and active sites on the variable-charge soil.