Simultaneous adsorption of lead and cadmium on MnO 2-loaded resin

• Published in: Journal of environmental sciences (China) 2010, Vol.22 (2), p.225-229
• Main Authors: Dong, Lijing, Zhu, Zhiliang, Ma, Hongmei, Qiu, Yanling, Zhao, Jianfu
• Format: Article
• Language: English
• Subjects: adsorption; cadmium; lead; MnO 2-loaded resin; simultaneous removal
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(09)60097-8

MnO 2-loaded D301 weak basic anion exchange resin has been used as adsorbent to simultaneously remove lead and cadmium ions from aqueous solution. The effects 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 Pb 2+ and Cd 2+ were simultaneously removed at pH range 5–6. Except for HPO 4 2−, the high concentration coexistent ions such as Na +, K +, Cl −, NO 3 −, SO 4 2− and HCO 3 −, showed no significant effect on the removal efficiency of both Pb 2+ and Cd 2+ under the experimental conditions. The coexistence of Mg 2+, Ca 2+ caused the reduction of Cd 2+ removal, but not for Pb 2+. The adsorption equilibrium for Pb 2+ and Cd 2+ could be excellently described by the Langmuir isotherm model with R 2 > 0.99. The maximum adsorption capacity was calculated as 80.64 mg/g for Pb 2+ and 21.45 mg/g for Cd 2+. The adsorption processes followed the pseudo first-order kinetics model. MnO 2-loaded D301 resin has been shown to have a potential to be used as an effective adsorbent for simultaneous removal of lead and cadmium ions from aqueous solution.