Removal of 3-chloroaniline from aqueous solution by treated coffee waste: isotherm modelling and thermodynamic studies

3-chloroaniline (3CA) concentrations were measured in aqueous solution by UV/Vis spectrophotometer. Validation of the calibration curve’s linearity, instrumental precision (RSD%), limits detection and quantification accomplished. The coefficient curve (1.0–10.0 mgL?1 3CA) had a high correlation (R2 = 0.9997) was range (RSD% 0.50–0.74%, n 10). LOD LOQ from regression analysis 0.20 0.61 mgL?1, respectively. A treated coffee waste adsorbent utilised for removal process sorption solution. major components are hemicellulose, cellulose, lignin. temperature effect (25°C, 35°C 45°C) on evaluated, with decreasing increasing which reached 87%, 75% 54%, Isotherms type L found associated monolayer sorption. parameters examined employing Langmuir, Freundlich Dubinin-Radushkevich models. isotherm models Langmuir acceptable coefficients 0.87–0.88). capacities to be 44 50 mgg?1. values separation factor (RL) ranging (0–1) indicated favourable In thermodynamic study physical confirmed van’t Hoff equation. addition, free energy ?G° (?19.1 kJmol?1) enthalpy ?H° (?56.6 negative suggested that spontaneous, exothermic.