title: Sorption isotherm and kinetic modeling of aniline on Cr-bentonite.
abstract: In this paper, the sorption characteristics of aniline on Cr-bentonite prepared using synthetic wastewater containing chromium was investigated in a batch system at 30 degrees C. The effects of relevant parameters, such as pH value of solution, adsorbent dosage and initial aniline concentration were examined. The experimental data were analyzed by the Langmuir and Freundlich, and Temkin models of sorption. The sorption isotherm data were fitted well to Langmuir isotherm and the monolayer sorption capacity was found to be 21.60 mg/g at 30 degrees C. Dubinin-Redushkevich (D-R) isotherm was applied to describe the nature of aniline uptake and it was found that it occurred chemically. The kinetic data obtained at different concentrations were analyzed using a pseudo first-order, pseudo second-order kinetic equation and intraparticle diffusion model. The experimental data fitted very well the pseudo second-order kinetic model. Intraparticle diffusion affects aniline uptake. The results indicate that there is significant potential for Cr-bentonite as an adsorbent material for aniline removal from aqueous solutions.
authors.affiliation: National Laboratory of Mineral Materials, China University of Geosciences, Beijing, PR China. zhengh@cugb.edu.cn
authors.forename: Hong
authors.initials: H
authors.lastname: Zheng
authors.forename: Donghong
authors.initials: D
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Zheng
authors.forename: Shuping
authors.initials: S
authors.lastname: Liang
authors.forename: Zhe
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000302:isolation & purification*; D001546:Bentonite / Q000737:chemistry*; D002857:Chromium; D007700:Kinetics; D008956:Models, Chemical; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D000814:Aniline Compounds; D014874:Water Pollutants, Chemical; D002857:Chromium; D001546:Bentonite; C023650:aniline