Abstract
In this study, we synthesized novel chitosan-lignin hydrogel composite beads and evaluated their efficacy in the adsorption of DB-218 from aqueous solutions and compared the results with pure chitosan hydrogel beads. Initial concentration, pH, contact duration, and adsorbent dose were among the several reaction parameters that were optimized. The synthesized CL composite beads had a potential to remove 96 % of DB-218 and the pure C hydrogel beads removed 94.8 % of DB-218 from aqueous solution within 120 min. The optimum pH value for the adsorption of DB-218 was 4. According to the equilibrium data, the Langmuir isothermal model provided the best fit with a maximum adsorption capacity of 75.75 mg/g (C) and 93.5 mg/g(CL) and the adsorption process followed the pseudo-second-order kinetic model. The result observed with chitosan-lignin composite hydrogel materials showed its possibility of using them for wastewater treatment for the elimination of textile dyes. The integration of lignin to chitosan improves its adsorption capacity, making CL composite beads is an novel approach for effective and sustainable solution to deal with water system contamination.
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