Peach-nut Shells-An Effective and Low Cost Adsorbent for the Removal of Endosulfan from Aqueous Solutions

Pakistan Journal of Analytical & Environmental Chemistry

关键词: Peach nut shells;    Endosulfan;    Adsorption;    Isotherms;    Thermodynamics.;   

DOI  :  

来源: DOAJ

【 摘 要 】

In the present studies the adsorption efficiency of peach nut shells for the removal of endosulfan from aqueous solutions has been investigated. The adsorption of endosulfan has been studied as a function of contact time, concentration and temperature. Maximum adsorption (95 ± 1%) was achieved for 0.24 × 10−4 mol dm−3 of endosulfan solution, using 0.1 g of adsorbent in 20 ml of solution for 30 min agitation time at pH 6. The Freundlich and Langmuir isotherms fit the equilibrium data satisfactory and their constants, adsorption intensity 1/n (0.36), multilayer adsorption capacity Cm 6.5 ±0.26 mmol g−1, and monolayer adsorption capacity Q 0.27 ± 0.03 mmol g−1, have been evaluated. Thermodynamics parameters namely change in enthalpy ∆H, Gibbs free energy ∆G and entropy ∆S, were calculated. The negative values of ∆G and positive value of ∆H indicate that the adsorption process is spontaneous and endothermic in nature and positive value of entropy ∆S confirms the possibility of the favorable adsorption. The developed adsorption method has been employed to surface water samples.

【 授权许可】

Unknown