Adsorption Science & Technology · 2006 · 18 citations · 35 references
EngineeringChemical EngineeringEnvironmental EngineeringEnvironmental ChemistryEnvironmental RemediationSurface ScienceAdsorption At InterfacesAdsorption ProcessesMineral Surface ChemistryOrganic Contaminant RemediationOrganic Contaminant RemovalSurface AdsorptionAdsorbent CharacterizationAdsorption At Mineral SurfacesAdsorption CapacityAdsorption ChemistryAdsorption EquilibriumAdsorption Of Organic PollutantsHazardous PollutantsMineral Surface Adsorption
An organobentonite was prepared by adsorbing the cationic surfactant hexadecyltrimethylammonium bromide (HDTMA) onto the surface of a calcium bentonite. The adsorption capacity of the organobentonite towards 2,4-dichlorophenoxyacetic acid (2,4-D), phenol and the dichromate ion (HCrO − 4 ) from aqueous solutions was investigated. The Langmuir isotherm gave a reasonable fit to the experimental data for the sorption of 2,4-D, phenol and the HCrO − 4 ion onto the organobentonite. The adsorption equilibrium data for 2,4-D demonstrated bimodal adsorption for equilibrium concentrations of 2,4-D greater than 650 mg/l. The capacity of the organobentonite for sorbing 2,4-D, phenol and the HCrO − 4 ion was considerably higher than that of the bentonite. This capacity was compared to that of a commercial activated carbon (F-400), from which it was concluded that modification of the bentonite substantially enhanced its adsorption capacity whereas the capacity of the organobentonite was lower than that of the F-400 carbon.
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C. H. Giles, T. H. MacEwan, S. N. Nakhwa et al. · Journal of the Chemical Society (Resumed) · 1960 · 3.2K citations