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Removal of lead from aqueous solution by hydroxyapatite/ manganese dioxide composite
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Removal of lead from aqueous solution by hydroxyapatite/ manganese dioxide composite
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Removal of lead from aqueous solution by hydroxyapatite/ manganese dioxide composite
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Journal Article
Removal of lead from aqueous solution by hydroxyapatite/ manganese dioxide composite
2016
Overview
A novel composite adsorbent, hydroxyapatite/ manganese dioxide （HAp/MnO2）, has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO2 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 （Ca2＋, Mg2＋）, 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 experi- mental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg. gl. The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO2 composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.
