Adsorption of bentazon on activated carbon prepared from Lawsonia inermis wood: Equilibrium, kinetic and thermodynamic studies

Arabian Journal of Chemistry

关键词: Activated carbon;    Bentazon;    Adsorption;    Isotherm;    Kinetic;    Thermodynamic;   

DOI  :  10.1016/j.arabjc.2012.04.047

来源: DOAJ

【 摘 要 】

The adsorption of bentazon onto Lawsonia inermis wood-based activated carbon (LWAC) was carried out in this work. The effects of different reaction parameters such as the initial bentazon concentration, contact time, activated carbon dosage, stirring rate, temperature and pH on bentazon adsorption were investigated in a batch process mode. Equilibrium data were analyzed by the Langmuir, Freundlich and Temkin isotherm model. Langmuir isotherm provided the best fit to the equilibrium data with maximum adsorption capacity of 169.49 mg/g at 20 °C. Adsorption kinetic was found to follow the pseudo-second-order kinetic model. The mechanism of the adsorption process was determined from the intraparticle diffusion model. The calculated thermodynamic parameters such as ΔG°, ΔH° and ΔS° showed that the adsorption of bentazon onto LWAC was feasible, spontaneous and exothermic at 20–40 °C. Desorption of the used LWAC was studied using ethanol as solvent and a percent desorption efficiency of bentazon equalizes 73.8% was obtained after three cycles.

【 授权许可】

Unknown