Oxidative Modification of Pumpkin Peel and Its Adsorption Performance for Cu(Ⅱ)and Pb(Ⅱ)
Oxidized pumpkin peel(OPP)biosorbent was prepared by modifying the agricultural waste pumpkin peel(PP)using H2O2.The adsorbent was characterized before and after modification using infrared spectroscopy,XRD,and XPS,and the adsorption performance of pumpkin peel biosorbent for Cu(Ⅱ)and Pb(Ⅱ)was investigated.The results showed that the adsorption capacity of pumpkin peel for Cu(Ⅱ)and Pb(Ⅱ)increased significantly after modification.The maximum adsorption capacity of modified pumpkin peel for Cu(Ⅱ)and Pb(Ⅱ)was 238.09 mg/g and 338.98 mg/g at pH 5.0,respectively.The adsorption isotherms of Cu(Ⅱ)and Pb(Ⅱ)were consistent with the Langmuir model,which indicated that the adsorption process was a mono-molecular layer adsorption,and the kinetics of adsorption of the two metals were consistent with the quasi-secondary kinetic equation.After five adsorption-desorption cycle experiments,there was no significant change in the adsorption capability for hydrogen peroxide-modified pumpkin skin,indicating that hydrogen peroxide-modified pumpkin skin has good reusability and has potential application in the treatment of heavy metal wastewater.
Agricultural wastePumpkin peelHydrogen peroxide Heavy metal ionAdsorption
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