Study on cadmium ions removal from wastewater by sulfydryl modified coal gangue
Using sulfydryl modified thermal activation to prepare sulfydryl modified coal gangue,the struc-ture and surface functional groups of the sulfydryl modified coal gangue were analyzed by SEM,XRD,FT-IR,Zeta potential methods;besides,the effect of wastewater pH value,coexisting ions and sulfydryl modified coal gangue dosage on adsorption of Cd2+was investigated,and the adsorption kinetics and adsorption isotherms were discussed.The results showed that,sulfydryl modified coal gangue has rich pore channels and sheet-like struc-ture,the best adsorption effect on Cd2+was obtained when the wastewater pH value was 9.0.Na+,K+,Mg2+com-pete with Cd2+for adsorption,inhibiting the removal of Cd2+.A compound was formed with F-,CO32-and Cd2+,which promoting the removal of Cd2+.The adsorption of Cd2+by sulfydryl modified coal gangue fits pseudo second order kinetics and Freundlich adsorption isotherm,which is mainly chemical adsoption exhibiting multi-layered adsorption.Under the condition that the sulfydryl modified coal gangue dosage was 5 g/L,the pH value we 9.0,the temperature was 50 ℃,the adsorption rate of Cd2+was 98.33％,the adsorption capacity was 65.32 mg/L,it was indicated that sulfydryl modified coal gangue had good adsorption performance on cadmium ions.
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