title: Surfactant-modified montmorillonite as a nanosized adsorbent for removal of an insecticide: kinetic and isotherm studies.
abstract: Surfactant-modified montmorillonites (MMT) were prepared using trimethyloctylammonium bromide (TMOAB) and employed as a nanosized adsorbent to remove diazinon from aqueous solutions. The prepared adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The dependence of removal efficiency on initial diazinon concentration, amount of adsorbent, pH of the solution and ionic strength was investigated. The affinity sequence for ion adsorption on TMOAB/MMT was in the order: without anion> sodium carbonate> sodium bicarbonate> sodium sulphate> sodium chloride. The adsorption kinetic and isotherm were best fit by a pseudo-second-order kinetic and Langmuir isotherm models, respectively.
authors.affiliation: a Department of Chemistry, Faculty of Science , Atatürk University , 25240 Erzurum , Turkey.
authors.forename: Aydin
authors.initials: A
authors.lastname: Hassani
authors.affiliation: b Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry , University of Tabriz , Tabriz , Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Khataee
authors.affiliation: a Department of Chemistry, Faculty of Science , Atatürk University , 25240 Erzurum , Turkey.
authors.forename: Semra
authors.initials: S
authors.lastname: Karaca
authors.affiliation: c Department of Environmental Health Engineering, School of Public Health , Iran University of Medical Sciences , Tehran , Iran.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Shirzad-Siboni
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D003976:Diazinon / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry*; D007700:Kinetics; D009994:Osmolar Concentration; D013501:Surface-Active Agents / Q000737:chemistry; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D007306:Insecticides; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D001546:Bentonite; D003976:Diazinon
keywords: adsorption; diazinon; modified clay; montmorillonite; nanoclay