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Removal of rhodamine B using iron-pillared bentonite

Hou, Mei-Fang, Ma, Cai-Xia, Zhang, Wei-De, Tang, Xiao-Yan, Fan, Yan-Ning, Wan, Hong-Fu
Journal of hazardous materials 2011 v.186 no.2-3 pp. 1118-1123
Fourier transform infrared spectroscopy, X-ray diffraction, adsorption, bentonite, ion exchange, models, nitrogen, pH, sorption isotherms, surface area, temperature, China
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, N₂ 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.