Removal of rhodamine B using iron-pillared bentonite

J Hazard Mater. 2011 Feb 28;186(2-3):1118-23. doi: 10.1016/j.jhazmat.2010.11.110. Epub 2010 Dec 3.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Algorithms
  • Bentonite / chemistry*
  • Fluorescent Dyes / isolation & purification*
  • Hydrogen-Ion Concentration
  • Iron / chemistry*
  • Kinetics
  • Models, Statistical
  • Rhodamines / isolation & purification*
  • Spectrophotometry, Ultraviolet
  • Spectroscopy, Fourier Transform Infrared
  • Thermodynamics
  • X-Ray Diffraction

Substances

  • Fluorescent Dyes
  • Rhodamines
  • Bentonite
  • Iron
  • rhodamine B