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Environmental Engineering Research 1999;4(2): 81-88.
REMOVAL OF PHENOLS FROM AQUEOUS SOLUTION WITH ORGANICALLY MODIFIED BENTONITE
Sang-June Choi1, Young-Woong Jeon1, Eun-Il Kim2, and Seok-Hun Lee2
1Dept. of Environmental Engineering, Kyungpook National University, Taegu 702-701, Korea
2Dept. of Chemical Engineering, Kyungpook National University, Taegu 702-701, Korea
Corresponding Author: Sang-June Choi ,
Received: November 6, 1998;  Accepted: May 6, 1999.
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ABSTRACT
Bentonite was organically modified by using ammonium cations such as hexadecyltrimethylam-monium(HDTMA), dodecyltrimethylammonium(DDTMA) and tetramethylammonium(TMA) to enhance re¬moval capacity of organic contaminants dissolved in aqueous solution. This modification produced a change of the surface property of bentonite from hydrophilic to organophilic. The individual adsorption of three am¬monium cations was performed in a batch reactor to investigate their uptake behavior on bentonite surfaces at 25 "C. Among the three ammonium cations, HDTMA showed the strongest adsorption in terms of mon¬olayer capacity and adsorptive strength. These adsorption isotherms were well represented by the Langmuir and the Redlich-Peterson(R&P) models. The removal of toxic organic contaminants such as 2-chlorophenol, aniline, and benzyl alcohol was subsequently achieved by incorporating the modified bentonite. The sorption capacity of the modified bentonite for the organic contaminants was significantly enhanced.
Keywords: adsorption | organic contaminants | organo-bentonite | sorption capacity | wastewater
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