Adsorption Behavior for Pb(Ⅱ)of Expanded Graphite Doped with CoFe2O4
In order to solve the problem of difficult recovery after adsorption of expanded graphite,magnetic expanded graphite was prepared by incorporating CoFe2O4 particles into expanded graphite using the citric acid based sol-gel technique.The microcosmic performance and magnetic property of the products were characterized by SEM and hysteresis loop.The effect factors of the adsorption behavior for Pb(Ⅱ)of expanded graphite and magnetic expanded graphite were investigated,including adsorption time,initial concentration of Pb(Ⅱ),adsorbent dosage and pH value,as well as the adsorption behavior and mechanism were analysed using adsorption kinetics and adsorption isotherm model.The results show that the maximum adsorption capacities for Pb(Ⅱ)of expanded graphite and magnetic expanded graphite reach to 95.6 and 69.8 mg/g,respectively.The adsorption kinetics for Pb(Ⅱ)of expanded graphite and magnetic expanded graphite adhere to the pseudo-second-order kinetic model and the adsorption isotherms are well consistent with the Langmuir isotherm model.Incorporating CoFe2O4 particles on expanded graphite shortens the time to obtain adsorption equilibrium condition for Pb(Ⅱ),and shifts the pH value of optimal adsorption to a more basic condition.
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