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	bibo:abstract "Fe₃O₄/CNC bioadsorbents have been synthesized as adsorbents for the adsorption of methylene blue. This study aims to synthesize and characterize Fe₃O₄/CNC from salak palm fronds as an adsorbent for the adsorption of methylene blue. The composite was synthesized using the in situ coprecipitation method and characterized using XRD, FTIR, SEM, and GSA instruments. FTIR results showed functional groups -OH, C-H, H-O-H, C-O-C, Fe-OH, and Fe-O at wavenumbers 3486; 3417; 2922; 1630; 1061; 893; and 582 cm⁻¹. XRD characterization revealed that the Fe₃O₄/CNC index numbers corresponded to the JCPDS standard data for magnetite No. 19-0629, with average Fe₃O₄/CNC crystal sizes of 25 mL, 50 mL, and 75 mL samples were 38.53 nm, 14.57 nm, and 19.95 nm, respectively, with crystallinity percentages of 45.96%, 39.08%, and 43.74%. SEM characterization revealed a rough, porous surface morphology with agglomeration, and an average particle diameter of 23.8282 nm. GSA analysis indicated a surface area of 49.9121 m²/g, a pore volume of 0.2155 cm³/g, and an average pore size of 8.63719 nm, which falls within the mesopore category. Adsorption activity tests were conducted at pH 11 and an adsorbent mass of 35 mg yielding adsorption percentages of 67.84% and 69.61%.The kinetic study followed the Ho pseudo-second-order model with an R² value of 0.9943, indicating that the adsorption process is influenced by chemisorption mechanisms, while the adsorption isotherm study followed the Freundlich isotherm model and described physical adsorption with an R² value of 0.9711. Adsorption capacity (Kf) of 0.4032 mol/g and a value of n < 1 of 0.5638. Based on the research, the Fe₃O₄/CNC bioadsorbent has the potential to be used as an adsorbent for the treatment of methylene blue dye wastewater."^^xsd:string;
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