title: Adsorption of phenol and m-chlorophenol on organobentonites and repeated thermal regeneration.
abstract: Experimental investigations were conducted on the adsorption characteristics of phenol and m-chlorophenol by organobentonites. The organobentonites were prepared by modifying natural bentonite with various quaternary ammonium salts including tetramethylammonium bromide, hexadecyltrimethylammonium bromide, benzyl-triethylammonium bromide, tetraethylammonium bromide and cetylpyridinium bromide. The adsorption characteristics of phenol and chlorophenol by these organobentonites were examined in detail. The empirical Freundlich isotherm was found to describe well the equilibrium adsorption data. Thermal regeneration of spent organobentonites was also investigated and operating conditions of 200 degrees C and 2 h heating were found to yield very good results.
authors.affiliation: Department of Chemical Engineering, Yuan Ze University, Chungli, Taiwan, Peoples Republic of China. ceshlin@saturn.yzu.edu.tw
authors.forename: S H
authors.initials: SH
authors.lastname: Lin
authors.forename: M J
authors.initials: MJ
authors.lastname: Cheng
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D007220:Industrial Waste; D019800:Phenol / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D002733:Chlorophenols; D007220:Industrial Waste; D001546:Bentonite; D019800:Phenol; C030682:3-chlorophenol