Competitive adsorption characteristics of Co2+, Ni2+, and Cr3+ by IRN-77 cation exchange resin in synthesized wastewater

• Published in: Chemosphere (Oxford) Vol. 56; no. 2; pp. 141 - 147
• Main Authors: KANG, So-Young, LEE, Jong-Un, MOON, Seung-Hyeon, KIM, Kyoung-Woong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01-07-2004
• Subjects: Adsorption; Applied sciences; Exact sciences and technology; General purification processes; Industrial wastewaters; Ion Exchange Resins - chemistry; Kinetics; Metals, Heavy - chemistry; Pollution; Waste Disposal, Fluid - methods; Wastewaters; Water treatment and pollution; Langmuir sorption isotherm; Nickel II; Cationic resin; Liquid solid adsorption; Adsorption isotherm; Adsorption capacity; Competitive reaction; Competitive adsorption; Heavy metals; Heavy metal; Operating conditions; Chromium III; Industrial waste water; Cobalt II; Physicochemical purification; Ion exchange; Waste water purification; Cation exchange resin
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2004.02.004

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.