Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 216, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2022.112579
Keywords
Chitosan; Activated clinoptilolite; Congo red; Methylene blue; Adsorption mechanism
Funding
- Natural Science Foundation of Shandong Province [ZR2020MB010, ZR2020MB009]
- National Natural Science Foundation of China [21672046, 21372054]
- Fund from the Huancui District of Weihai City
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In this study, a mesoporous crosslinked chitosan-activated clinoptilolite biocomposite was prepared and demonstrated excellent performance for dyes removal in aqueous solution. It could be a practical candidate for industrial applications.
A mesoporous crosslinked chitosan-activated clinoptilolite biocomposite (CS-GA/ACP) was prepared with chitosan (CS) as the substrate and glutaraldehyde (GA) as the crosslinking agent. Structural analysis of the CS-GA/ ACP composite beads was performed using FTIR, SEM, and BET techniques. The adsorption properties of the CSGA/ACP for Congo red (CR) and methylene blue (MB) removal were examined using a batch method. The effects of CS loading, CS-GA/ACP dosages (0.005-0.25 g), pH values (3-11), initial concentrations (30-300 mg/L), contact time (5-120 min), ionic strength, and temperatures (25-65 degrees C) on the adsorption of CR and MB on the CS-GA/ACP composite beads were investigated. The pseudo-second-order kinetics could better describe the adsorption process than the pseudo-first-order kinetics, and the Langmuir isotherms model agreed well with the experimental data. The maximum adsorption capacities of the CS-GA/ACP for CR and MB were 180.59 mg/g and 143.67 mg/g at 25 degrees C, respectively. The proposed mechanism studies showed that the possible interaction between the adsorbent and dye molecules were Yoshida H-bonding, dipole-dipole H-bonding, electrostatic interaction and n-pi interaction. The CS-GA/ACP can be recycled to remove dyes without significant loss of efficacy, and the adsorption of dyes on the CS-GA/ACP is spontaneous endothermic adsorption. Overall, the CS-GA/ACP showed an excellent performance for dyes removal in aqueous solution and could be a practical candidate for industrial applications.
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