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Production and Application of a Treated Bentonite–Chitosan Composite for the Efficient Removal of Humic Acid From Aqueous Solution Publisher



Dehghani MH1, 2, 3 ; Zarei A4, 5, 6 ; Mesdaghinia A1 ; Nabizadeh R1 ; Alimohammadi M1 ; Afsharnia M1 ; Mckay G5, 6
Authors

Source: Chemical Engineering Research and Design Published:2018


Abstract

Humic acids have a significant undesirable influence on drinking water quality. In this study, we utilized a physically and chemically treated bentonite–chitosan composite (TBCH) for the removal of humic acid from aqueous solutions. Response surface methodology (RSM) using central composite design (CCD) was used to investigate the effects of pH, adsorbent dosage, humic acid concentration and contact time on the adsorption effectiveness of humic acid by TBCH. Isotherms, kinetics and thermodynamics have been also studied. An optimum condition for humic acid uptake was achieved at pH 4, 1.4 g/L adsorbent dosage, 40 mg/L humic acid concentration, and 115 min contact time. This study showed that modified bentonite and chitosan composite (TBCH) was a promising adsorbent for the removal of humic acid from aqueous solutions due to its significant removal efficiency, natural abundance and low cost; it may be an alternative to more costly available materials. © 2018
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