Simultaneous adsorption of lead and cadmium on MnO2-loaded resin
Lijing Dong , Zhiliang Zhu , Hongmei Ma , Yanling Qiu , Jianfu Zhao
DOI:
Received May 08, 2009,Revised June 26, 2009, Accepted , Available online
Volume 22,2010,Pages 225-229
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MnO2-loaded D301 weak basic anion exchange resin has been used as adsorbent to simultaneously remove lead and cadmium
ions from aqueous solution. The e ects of adsorbent dosage, solution pH and the coexistent ions on the adsorption were investigated.
Experimental results showed that with the adsorbent dosage more than 0.6 g/L, both Pb2+ and Cd2+ were simultaneously removed at
pH range 5–6. Except for HPO4
2??, the high concentration coexistent ions such as Na+, K+, Cl??, NO3??, SO4
2?? and HCO3??, showed no
significant e ect on the removal e ciency of both Pb2+ and Cd2+ under the experimental conditions. The coexistence of Mg2+, Ca2+
caused the reduction of Cd2+ removal, but not for Pb2+. The adsorption equilibrium for Pb2+ and Cd2+ could be excellently described
by the Langmuir isotherm model with R2 > 0.99. The maximum adsorption capacity was calculated as 80.64 mg/g for Pb2+ and 21.45
mg/g for Cd2+. The adsorption processes followed the pseudo first-order kinetics model. MnO2-loaded D301 resin has been shown to
have a potential to be used as an e ective adsorbent for simultaneous removal of lead and cadmium ions from aqueous solution.
