title: Adsorption studies of Dichloromethane on some commercially available GACs: Effect of kinetics, thermodynamics and competitive ions.
abstract: The objective of this work was to compare the effectiveness of four commercially available granular activated carbons (GACs); coconut (CGAC), wood (WGAC), lignite (LGAC) and bituminous (BGAC) for the removal of dichloromethane (DCM) from aqueous solution by batch process. Various parameters such as thermodynamics, kinetics, pH, concentration of adsorbate, dosages of adsorbent and competitive ions effect on DCM adsorption were investigated. Maximum adsorption capacity (45.5mg/g for CGAC) was observed at pH 6.0-8.0. The kinetics data indicate better applicability of pseudo-second-order kinetics model at 25 and 35 degrees C. Freundlich model was better obeyed on CGAC, WGAC, and BGAC, while LGAC followed Langmuir model. The adsorption process for 100mg/L initial DCM concentration on CGAC was exothermic in nature. The adsorption of DCM on various adsorbents involves physical adsorption process. The adsorption of DCM over a large range of initial concentration on CGAC and LGAC is effective even in presence of ionic salts.
authors.affiliation: Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 220-710, South Korea.
authors.forename: Moonis Ali
authors.initials: MA
authors.lastname: Khan
authors.forename: Seong-wook
authors.initials: SW
authors.lastname: Kim
authors.forename: Rifaqat Ali Khan
authors.initials: RA
authors.lastname: Rao
authors.forename: R A I
authors.initials: RA
authors.lastname: Abou-Shanab
authors.forename: Amit
authors.initials: A
authors.lastname: Bhatnagar
authors.forename: Hocheol
authors.initials: H
authors.lastname: Song
authors.forename: Byong-Hun
authors.initials: BH
authors.lastname: Jeon
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002849:Chromatography, Gas; D003031:Coal; D003059:Cocos / Q000737:chemistry; D005410:Flame Ionization; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008752:Methylene Chloride / Q000737:chemistry*; D011208:Powders; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014934:Wood / Q000737:chemistry
chemical_list: D003031:Coal; D011208:Powders; D012996:Solutions; D008752:Methylene Chloride; D002244:Carbon