title: Modification of bentonite with cationic surfactant for the enhanced retention of bisphenol A from landfill leachate.
abstract: Bentonite was modified with cationic surfactant hexadecyl trimethyl ammonium bromide (HTAB) as landfill liner to retard the transportation of bisphenol A (BPA) for the first time. The modification was confirmed to form a lateral bi-layer in the interlayer space of bentonite by scanning electron microscope, X-ray diffraction, and Fourier transform infrared spectroscopy. The introduction of HTAB into the internal position of bentonite led to an increased interlayer space of bentonite from 15.0 to 20.9 Å and a higher sorption affinity for BPA (10.449 mg/g of HTAB-bentonite and 3.413 mg/g of raw bentonite). According to the Freundlich model, the maximum adsorption capacity of the HTAB-bentonite was found to be 0.410 mg/g. The sorption capacity of raw bentonite and HTAB-bentonite both decreased at alkaline conditions. Although the hydraulic conductivity of HTAB-bentonite was higher than that of raw bentonite, results of laboratory permeability and column tests indicated that HTAB-bentonite obviously extended the BPA breakthrough time by 43.4 %. The properties of the HTAB-bentonite revealed its notable advantages as components of landfill liners material to retain BPA in leachate.
authors: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, People's Republic of China, envly@hhu.edu.cn.
authors: Yi
authors: Y
authors: Li
authors: Fenglai
authors: F
authors: Jin
authors: Chao
authors: C
authors: Wang
authors: Yunxiao
authors: Y
authors: Chen
authors: Qing
authors: Q
authors: Wang
authors: Wenlong
authors: W
authors: Zhang
authors: Dawei
authors: D
authors: Wang
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D001559:Benzhydryl Compounds / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010636:Phenols / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction; D000098826:Bisphenol A Compounds
chemical_list: D001546:Bentonite; D001559:Benzhydryl Compounds; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D010636:Phenols; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds