Acid Activated Bentonite-La Crosslinked Sesbania Gum Beads for Efficient Congo Red Adsorption

Abstract

In this study, to recycle acid activated bentonite (AAB), novel hybrid beads were prepared from AAB and sesbania gum (SG), which might be an efficient adsorbent for removing an anionic dye Congo red (CR). To gain the greatest adsorption conditions of AAB-SG-La beads, experiments were carried out to evaluate the effects of initial pH value, AAB-SG-La beads dosage on CR removal. The optimal pH value of AAB-SG-La beads for CR elimination was in the range 4.0 ~ 8.0, which can broaden the applications of beads. In addition, the adsorption isotherm datas were consistent with the Langmuir adsorption model and adsorption kinetics conformed to the pseudo-second-order model. Furthermore, the adsorption capacity of CR was 588 mg/g, which revealed a superior adsorption capacity to other materials used as sorbents for CR. This work accredits that AAB-SG-La beads have the ability to remove anionic dye as an economical adsorbent.