Hybrid multifunctional biocomposite of chitosan grafted benzaldehyde/montmorillonite/algae for effective removal of brilliant green and reactive blue 19 dyes: Optimization and adsorption mechanism

Herein, a novel hybrid multifunctional biocomposite of chitosan grafted-benzaldehyde/montmorillonite/algae (CHS-BZ/MT/AL) was designed and applied for the highly efficient removal of brilliant green (BG) and reactive blue 19 (RB19) dyes from an aquatic environment. The influence of three processing factors, including CHS-BZ/MT/AL dose (0.02–0.08 g), pH solution (4–9), contact time (5–30 min), and their interactions on the removal rate of BG and RB19 dyes, was examined using the response surface methodology integrated with Box-Behnken design (RSM-BBD). The experimental outcomes of equilibrium and kinetic investigations showed that the adsorption of BG and RB19 dyes on CHS-BZ/MT/AL obey pseudo-second-order and Langmuir models. The CHS-BZ/MT/AL possesses a maximum adsorption capability of 899.5 mg/g for BG and 213.6 mg/g for RB19. The proposed mechanism of BG and RB19 adsorption in the lighting of the CHS-BZ/MT/AL's characterization is mainly included several interactions like electrostatic forces, π-π stacking, n-π stacking, and H-bonding. The current work indicates that the synthesized CHS-BZ/MT/AL with a distinct structure and excellent adsorptive characteristics could be employed to remove hazardous cationic and anionic dyes from industrial wastewater.