title: Modification of a Na-montmorillonite with quaternary ammonium salts and its application for organics removal from TNT red water.
abstract: Na-montmorillonite (Na-Mont) and organic montmorillonite modified by cetyltrimethylammonium bromide (CTAB-Mont) and tetramethylammonium bromide (TMAB-Mont) were prepared as adsorbents to remove organic contaminants from 2,4,6-trinitrotoluene (TNT) red water. The characterizations of the samples were performed with X-ray diffraction and Fourier transform infrared spectroscopy. The adsorption capacity of CTAB-Mont (15.9 mg/g) was much larger than Na-Mont (0.26 mg/g) and TMAB-Mont (1.7 mg/g). Langmuir isotherm and the pseudo-second-order kinetic models fitted the experimental results well. The main factor in the adsorption promotion was the distribution phase in the interlayer of CTAB-Mont. The arrangement of molecules analyzed by molecular simulation corresponded to the experimental data and supported the adsorption mechanism.
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Zilin
authors.initials: Z
authors.lastname: Meng
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Yihe
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Guocheng
authors.initials: G
authors.lastname: Lv
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Fengzhu
authors.initials: F
authors.lastname: Lv
authors.affiliation: National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China E-mail: zyh@cugb.edu.cn.
authors.forename: Limei
authors.initials: L
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D007220:Industrial Waste; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D014303:Trinitrotoluene / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D007220:Industrial Waste; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D014303:Trinitrotoluene; D001546:Bentonite