title: Removal of rhodamine B using iron-pillared bentonite.
abstract: The iron-pillared bentonite (Fe-Ben) was prepared by ion-exchange using the natural bentonite (GZ-Ben) from Gaozhou, China, at room temperature without calcination. Both Fe-Ben and GZ-Ben were characterized by X-ray diffraction, N(2) adsorption and Fourier transform infrared spectroscopy. The results show that the d(001) value and surface area of the bentonite material increased after iron pillaring. Fe-Ben adsorbed much more Rhodamine B (RhB) than GZ-Ben, which can be ascribed to the special surface properties and large surface area of Fe-Ben. The optimum pH value for the adsorption of RhB on Fe-Ben is 5.0. The adsorption of RhB onto Fe-Ben can be well described by the pseudo-second-order kinetic model and the intraparticle diffusion kinetic model. The adsorption isotherm of RhB onto Fe-Ben matches well with the Langmuir model.
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
authors.forename: Mei-Fang
authors.initials: MF
authors.lastname: Hou
authors.forename: Cai-Xia
authors.initials: CX
authors.lastname: Ma
authors.forename: Wei-De
authors.initials: WD
authors.lastname: Zhang
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Tang
authors.forename: Yan-Ning
authors.initials: YN
authors.lastname: Fan
authors.forename: Hong-Fu
authors.initials: HF
authors.lastname: Wan
mesh_terms: D000327:Adsorption; D000465:Algorithms; D001546:Bentonite / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D015233:Models, Statistical; D012235:Rhodamines / Q000302:isolation & purification*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; D001546:Bentonite; D007501:Iron; C029773:rhodamine B