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2016, Volume 10, Issue 1

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Frontiers of Environmental Science & Engineering >> 2016, Volume 10, Issue 1 doi: 10.1007/s11783-014-0722-5

Removal of lead from aqueous solution by hydroxyapatite/manganese dioxide composite

1. Key Laboratory of Yangtze River Water Environment, Ministry of Education, Shanghai 200092, China.2. Environmental Monitoring Centre of Changzhou, Changzhou 213000, China.3. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China

Accepted: 2014-06-12 Available online: 2015-12-03
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Abstract

A novel composite adsorbent, hydroxyapatite/manganese dioxide (HAp/MnO ), has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO is meant to increase its adsorption capacity. Various factors that may affect the adsorption efficiency, including solution pH, coexistent substances such as humic acid and competing cations (Ca , Mg ), initial solute concentration, and the duration of the reaction, have been investigated. Using this composite adsorbent, solution pH and coexistent calcium or magnesium cations were found to have no significant influence on the removal of lead ions under the experimental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg·g . The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.

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