期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 168, 期 2-3, 页码 826-831出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.02.105
关键词
Anion-cation modified palygorskite; p-Nitrophenol; Sorption; Isothermal sorption equation; Thermodynamics; Kinetics
资金
- Natural Science Foundation of Gansu, China [0803RJZA007]
- Key Laboratory of Polymer Materials of Gansu Province, China [ZD-04-17]
A series of anion-cation modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR. Compared with natural palygorskite, the p-nitrophenol sorption capacity with anion-cation modified palygorskite was significantly improved. The maximum sorption capacity (137.74 mg g(-1))was obtained with the mass ratio 1:4 and 3:10 of hexadecyltrimethylammonium bromide to sodium dodecyl sulfate and the surfactant to palygorskite of at 313 K. The sorption equilibrium was in accordance with the Langmuir isothermal sorption equations. Thermodynamic function calculated showed that the sorption was a spontaneous and exothermic process. Free energy of the sorption increased with the increase of the temperature. The sorption of p-nitrophenol followed the pseudo-second-order process (sorption rate constant: 0.00453 mg(-1) min(-1)). (C) 2009 Published by Elsevier B.V.
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