Adsorptive removal of Acidol Red 2BE-NW from aqueous solutions using chitosan/montmorillonite beads

摘要

In this study, the adsorption of the anionic dye Acidol Red 2BE-NW (AR42) on chitosan/montmorillonite (CTS/MMT) is investigated. A series of CTS/MMT beads were prepared by varying the chitosan to montmorillonite ratio and characterized by means of Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction (XRD) techniques. Batch experiments were carried out to assess the adsorption of AR42 from its aqueous solution using CTS/MMT as the adsorbent surface. Factors influencing control of the adsorption capacity of CTS/MMT such as initial pH value (pH(0)), adsorption time, initial dye concentration, chitosan contents, and temperature were investigated. The adsorption curves showed that the adsorption kinetics and isotherms were in good agreement with a pseudo-second-order and Langmuir patterns, respectively, with an observed maximum dye adsorption of 905mg/g on CTS/MMT (CTS wt%=25%). These results demonstrated the potential and the outstanding ability of CTS/MMT material for use in the anionic dye adsorption.