Sorption and desorption of carbamazepine from water by smectite clays.
Sorption and desorption of carbamazepine from water by smectite clays.
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DOI：
10.1016/j.chemosphere.2010.07.053
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发表时间：
2010-11
期刊：
影响因子：
8.8
通讯作者：
Weihao Zhang;Yunjie Ding;S. Boyd;B. Teppen;Hui Li
中科院分区：
文献类型：
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作者：
Weihao Zhang;Yunjie Ding;S. Boyd;B. Teppen;Hui Li
卡马西平是一种处方抗惊厥和情绪稳定药物管理的人。卡马西平在环境中具有持久性，经常在水系统中检测到。在这项研究中，卡马西平从水中的吸附和解吸的蒙脱石粘土与表面的负电荷补偿与K+，Ca 2+，NH 4+，四甲基铵（TMA），三甲基苯基铵（TMPA）和十六烷基三甲基铵（HDTMA）阳离子。吸附量大小顺序为：TMPA-蒙皂石> HDTMA-蒙皂石> NH_4-蒙皂石> K-蒙皂石> Ca-蒙皂石> TMA-蒙皂石。TMPA-蒙脱石对卡马西平的最大吸附是由于卡马西平中的共轭芳香基团与TMPA中的苯环通过π-π相互作用实现的。分配过程是HDTMA-蒙脱石摄取卡马西平的主要机制。对于NH 4-蒙脱石，卡马西平中的尿素部分通过氢键与交换的阳离子NH 4+相互作用，因此表现出相对较高的吸附。吸附K-，Ca-和TMA-蒙脱石从水中发生在铝硅酸盐矿物表面。这些结果表明，卡马西平吸附土壤发生主要是在土壤有机质，土壤矿物组分起次要作用。卡马西平从吸附剂上的解吸表现出明显的滞后现象。随着卡马西平水溶液浓度的增加，K-，Ca-，TMA-，TMPA-和HDTMA-粘土的解吸与吸附的不可逆性增加。卡马西平从钾，钙，NH 4-蒙脱石的解吸滞后大于从TMPA-和HDTMA-粘土，这表明，螯合卡马西平分子在蒙脱石夹层更耐解吸蒙脱石粘土中的有机相吸附相比。
Carbamazepine is a prescription anticonvulsant and mood stabilizing pharmaceutical administered to humans. Carbamazepine is persistent in the environment and frequently detected in water systems. In this study, sorption and desorption of carbamazepine from water was measured for smectite clays with the surface negative charges compensated with K+, Ca2+, NH4+, tetramethylammonium (TMA), trimethylphenylammonium (TMPA) and hexadecyltrimethylammonium (HDTMA) cations. The magnitude of sorption followed the order: TMPA-smectite⩾HDTMA-smectite>NH4-smectite>K-smectite>Ca-smectite⩾TMA-smectite. The greatest sorption of carbamazepine by TMPA-smectite is attributed to the interaction of conjugate aromatic moiety in carbamazepine with the phenyl ring in TMPA through π–π interaction. Partitioning process is the primary mechanism for carbamazepine uptake by HDTMA-smectite. For NH4-smectite the urea moiety in carbamazepine interacts with exchanged cation NH4+by H-bonding hence demonstrating relatively higher adsorption. Sorption by K-, Ca- and TMA-smectites from water occurs on aluminosilicate mineral surfaces. These results implicate that carbamazepine sorption by soils occurs primarily in soil organic matter, and soil mineral fractions play a secondary role. Desorption of carbamazepine from the sorbents manifested an apparent hysteresis. Increasing irreversibility of desorption vs. sorption was observed for K-, Ca-, TMA-, TMPA- and HDTMA-clays as aqueous carbamazepine concentrations increased. Desorption hysteresis of carbamazepine from K-, Ca-, NH4-smectites was greater than that from TMPA- and HDTMA-clays, suggesting that the sequestrated carbamazepine molecules in smectite interlayers are more resistant to desorption compared to those sorbed by organic phases in smectite clays.