title: Competitive adsorption characteristics of Co2+, Ni2+, and Cr3+ by IRN-77 cation exchange resin in synthesized wastewater.
abstract: Adsorption properties of Co2+, Ni2+, and Cr3+ on an Amberlite IRN-77 cation exchange resin were investigated in batch systems. Levels of adsorption rapidly approached an equilibrium state within 1 h. The adsorption characteristics of each metal onto the resin were accurately represented by Langmuir isotherms. Co2+ and Ni2+, which have an equivalent electrovalence, displayed similar levels of adsorption onto the resin when they coexisted in the solution. However, when Cr3+ was added to the solution it competitively replaced Co2+ and Ni2+ ions that had been previously adsorbed onto the resin, resulting in the desorption of these metals into the solution. The result was likely due to a higher adsorption affinity of Cr3+ relative to Co2+ and Ni2+. This implies that interactively competitive adsorption of multi-cations onto the resin should be thoroughly considered when contemplating the efficient operation of an ion exchange process in the treatment of industrial wastewater.
authors.affiliation: Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea.
authors.forename: So-Young
authors.initials: SY
authors.lastname: Kang
authors.forename: Jong-Un
authors.initials: JU
authors.lastname: Lee
authors.forename: Seung-Hyeon
authors.initials: SH
authors.lastname: Moon
authors.forename: Kyoung-Woong
authors.initials: KW
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D007475:Ion Exchange Resins / Q000737:chemistry*; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D007475:Ion Exchange Resins; D019216:Metals, Heavy