Removal of Metribuzin Herbicide from Aqueous Solution Using Corn Cob
نویسندگان
چکیده
Agricultural solid waste (corn cob) has been investigated asbiosorbent for removal of metribuzin herbicide from aqueous solution. Parameters influencing extraction efficiency such as pH of the sample, contact time of sample with biosorbent, shaking time, temperature, heating time, sorbent dose were studied. Maximum sorption of metribuzinwas found at pH 5.0. The sorption of metribuzin on corn cob was analyzed by Langmuir,Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherm models. Equilibrium data fitted well forLangmuir isotherm. Monolayer sorption capacity was found to be 4.07 mgg -1 using Langmuir isotherm. Freundlich empirical constants, KF and n were 1.23 mgg -1 and 2.05 Lg -1 respectively. Pseudofirst-order and pseudo-second-order models were used for kinetics study of sorption process. It was found that pseudo-second-order model hasthe best correlation value (r 2 = 0.9180) among the kinetic models. Valuesof thermodynamic parameters such as change of free energy ( G o ), enthalpy ( H o ) and entropy ( S o ) ofsorption process indicated the process is endothermic and proceeded spontaneously.
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