Adsorption study of nermiculite,montmorillonite and bentonite on heavy metal chromium
TAN Rong
ZHU Jian
WANG Ping
YANG Yuzhong
ZHU Yelin
JIN Qi
Abstract：Adsorption of heavy metal ions such as Cr6+ on vermiculite,montmorillonite and bentonite was studied.With the static experimental method,the adsorption factors,rules,optimum adsorption condition and adsorption properties of the three kinds of clay minerals were obtained.The active group structure,morphology and chemical elements were examined by fourier transform infrared spectroscopy,scanning electron microscope,energy dispersive spectrometer and X-ray diffraction.The results indicate that the adsorption equilibriums are achieved in 60 minutes.The uptake of Cr6+ by the three kinds of clay minerals maintaines high efficiencies in the pH of 5.The adsorption of Cr6+ onto vermiculite,montmorillonite and bentonite could be well described by pseudo-second-order model.The theoretical maximum adsorption amount fitted by Langmuir isothermal are 19.959,8.3963,15.432 mg·g-1 As the results of optimization test show,optimal condition for adsorption of Cr6+ on vermiculite,montmorillonite and bentonite are adsorbent concentration 1.0 g · L-1,adsorbate concentration 300 mg · L-1,pH 5.0,reaction temperature 25 ℃,adsorption time 120 min.Among the three,vermiculite has the best adsorption effect on Cr6+.
Keywords：vermiculitemontmorillonitebentoniteadsorption
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 82-89 )