Removal of Cadmium from Aqueous Solution by Hydroxyapatite/manganese Dioxide Composite
A novel composite adsorbent, hydroxyapatite/manganese dioxide (HAp/MnO2), has been prepared for the purpose of removing cadmium ions from aqueous solution. The combination of HAp with MnO2 aims to increase the adsorption capacity. Varying factors that may affect the adsorption efficiency, including solution pH and coexistent substances such as humic acid and competing cations (Ca2+, Mg2+), have been investigated. It is remarkable that using the developed composite absorbent, more than 99% of Cd2+ions can be removed under desirable experimental conditions, the maximum adsorption capacity is 169.5 mg.g-1. Solution pH and coexisting substances have no significant influence on the removal efficiency of Cd2+under the experimental conditions. Mechanistic studies show that the adsorption data fits the Langmuir isotherm model reasonably well and the adsorption processes obeys the pseudo-second-order kinetics model. Based on the experiment results, it is concluded that HAp/MnO2 composite has been shown to be as an effective adsorbent with high adsorption capacity for removing Cd2+from aqueous solution.
DONG Lijing ZHU Linyan QIU Yanling ZHU Zhiliang
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, C Key Laboratory of Yangtze River Water Environment, Ministry of Education of China, Shanghai, 200092,
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
649-654
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）