title: Application of linear free energy relationships to characterizing the sorptive characteristics of organic contaminants on organoclays from water.
abstract: Linear free energy relationships (LFERs) were applied to investigate the sorptive characteristics of organic contaminants (OCs) on organoclays from water. Three cetyltrimethylammonium modified montmorillonites (C-Mts) were selected as representative organoclays. The sorption coefficients (logK(oc)) of OCs on the C-Mts were calculated according to the results of batch sorption experiments. Then the LFER equations for OC sorption on C-Mts from water were developed. The results of this study showed that compared with bulk water, water saturated C-Mts are more polarizable, less polar and cohesive, and have stronger H-bond acceptor capacities and weaker H-bond donor capacities. The primary driving forces for the sorption of OCs from water to C-Mts can be ascribed to the weaker cohesive characteristics of C-Mts as well as the stronger nonspecific Van der Waals interaction between OCs and C-Mts. With increasing CTMA loading amount, the interaction between OCs and C-Mts increases whereas the C-Mts become more cohesive. Consequently, the sorption capacity of C-Mts first increases with CTMA loading amount and then decreases with further increased loading amount.
authors: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China. zhurunliang@gmail.com
authors: Runliang
authors: R
authors: Zhu
authors: Wangxiang
authors: W
authors: Chen
authors: Yun
authors: Y
authors: Liu
authors: Jianxi
authors: J
authors: Zhu
authors: Fei
authors: F
authors: Ge
authors: Hongping
authors: H
authors: He
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002593:Cetrimonium Compounds; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D001546:Bentonite; D000077286:Cetrimonium