Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 24, 2024

In the current work, three adsorbent materials were developed; biochar derived from date palm fiber (C), biochar/chitosan nanoparticles (CCS), and composite supplemented with glutamine (CCSG). These compounds used as solid adsorbents to remove As⁵⁺ polluted water. Several characterization approaches investigate all synthesized adsorbents, including TGA, N₂ adsorption/desorption isotherm, SEM, TEM, ATR-FTIR, zeta potential. CCSG demonstrated good thermal stability, a maximum specific surface area of 518.69 m²/g, microporous radius 0.97 nm, total pore volume 0.25 cm³/g, an average particle size 38 pH_pzc 6.9. To optimize reaction conditions, various sorption factors examined, contact time, pH, initial concentration, dosage, temperature, ionic strength. The study found that modified samples able more (CCS; 256.0 mg/g CCSG; 376.0 mg/g) than unmodified ones (C; 150.5 mg/g). removal procedure corresponded well Langmuir isotherm model. Thermodynamic kinetic experiments show Elovich, PFO, Van't Hoff plot endothermic, spontaneous, physisorption nature are best fitted models. EDTA has highest desorption efficiency percentage (98.8%). enhanced reusability after six application cycles adsorption/desorption, only 4% decrease in adsorption. This demonstrates effectively wastewater use agricultural waste residues (date fiber; DPF) for environmental remediation purposes.

Language: Английский