期刊
CHEMICAL ENGINEERING JOURNAL
卷 164, 期 1, 页码 49-55出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.08.014
关键词
Pb(II)); Adsorption; beta-MnO2; Humic acid; Fulvic acid
资金
- National Natural Science Foundation of China [20907055, 20971126]
- 973 projects [2007CB936602]
- CAS
- Special Foundation for High-level Waste Disposal [2007-840]
In this study, the adsorption of Pb(II) on beta-MnO2 as a function of various environmental conditions such as contact time, pH, ionic strength, humic acid (HA)/fulvic acid (FA), and temperature was investigated using batch techniques. The results indicated that the adsorption of Pb(II) on beta-MnO2 was obviously dependent on pH but independent of ionic strength. The presence of HA/FA enhanced the adsorption of Pb(II) on beta-MnO2 at low pH, whereas reduced Pb(II) adsorption on beta-MnO2 at high pH. The kinetic adsorption of Pb(II) on beta-MnO2 can be well fitted by the pseudo-second-order rate equation. The thermodynamic parameters (Delta H degrees, Delta S degrees, and Delta G degrees) were also calculated from the temperature dependent adsorption isotherms, and the results suggested that the adsorption of Pb(II) on beta-MnO2 was a spontaneous and endothermic process. The adsorption of Pb(II) on beta-MnO2 was attributed to surface complexation rather than ion exchange. (C) 2010 Elsevier B.V. All rights reserved.
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