title: Co-adsorption of Trichloroethylene and Arsenate by Iron-Impregnated Granular Activated Carbon.
abstract: Co-adsorption of trichloroethylene (TCE) and arsenate [As(V)] was investigated using modified granular activated carbons (GAC): untreated, sodium hypochlorite-treated (NaClO-GAC), and NaClO with iron-treated GAC (NaClO/Fe-GAC). Batch experiments of single- [TCE or As(V)] and binary- [TCE and As(V)] components solutions are evaluated through Langmuir and Freundlich isotherm models and adsorption kinetic tests. In the single-component system, the adsorption capacity of As(V) was increased by the NaClO-GAC and the NaClO/Fe-GAC. The untreated GAC showed a low adsorption capacity for As(V). Adsorption of TCE by the NaClO/Fe-GAC was maximized, with an increased Freundlich constant. Removal of TCE in the binary-component system was decreased 15% by the untreated GAC, and NaClO- and NaClO/Fe-GAC showed similar efficiency to the single-component system because of the different chemical status of the GAC surfaces. Results of the adsorption isotherms of As(V) in the binary-component system were similar to adsorption isotherms of the single-component system. The adsorption affinities of single- and binary-component systems corresponded with electron transfer, competitive adsorption, and physicochemical properties.
authors.affiliation: Department of Civil and Environmental Engineering, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: Baolin
authors.initials: B
authors.lastname: Deng
authors.forename: Eun-Sik
authors.initials: ES
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D007501:Iron / Q000032:analysis; D014241:Trichloroethylene / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001149:Arsenates; D014874:Water Pollutants, Chemical; D002606:Charcoal; D014241:Trichloroethylene; D007501:Iron