To address the challenges posed by conventional water treatment technologies, it is essential to develop non-toxic adsorbents that are highly effective in removing pollutants. Herein, innovative, environmentally friendly chitosan-zeolitic imidazolate framework 67 (CSZ67) biocomposite beads were synthesized. They were used to remove the MG dye and Tetracycline. The Co2+ ions within the chitosan/Co2+ matrix serve as nucleation sites for the in-situ growth of ZIF-67. CSZ67 biocomposite beads with different [CS]:[Co] molar ratios named CSZ67-1 (1:0.5), CSZ67-2 (1:0.34), and CSZ67-3 (1:0.17) were synthesized. CSZ67-1 biocomposite exhibited the highest removal efficiency (96 %), and adsorption capacity (476 mg/g). The electrostatic interactions and π-π stacking are the dominant adsorption mechanisms. Dye removal follows the pseudo-second-order kinetic and Freundlich isotherm. The findings indicated that the biocomposite CSZ67-1, demonstrating a 75 % removal efficiency for tetracycline, not only exhibits high efficacy in adsorbing malachite green cationic dye but also performs effectively in the adsorption of tetracycline.
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