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Title: Characterization of a Ca-alginate based ion-exchange resin and its applications in lead, copper, and zinc removal
Authors: Chen, J.P. 
Wang, L.
Keywords: Ca-alginate based ion-exchange resin
Competitive effect
Metal removal
Issue Date: 2001
Citation: Chen, J.P., Wang, L. (2001). Characterization of a Ca-alginate based ion-exchange resin and its applications in lead, copper, and zinc removal. Separation Science and Technology 36 (16) : 3617-3637. ScholarBank@NUS Repository.
Abstract: Characterization of a novel ca-alginate based ion-exchange resin and its application in metal removal were investigated. The metal removal percentages increased from almost 0 to nearly 100% for metal concentrations < 0.1 mmol/L at pH 1.2 to 4, and a plateau was established at pH > 4. The removal percentages were in the following order: Pb2+ > Cu2+ > Zn2+ at pH < 4. Lower initial concentrations and ionic strengths slightly enhanced the removal percentage. The maximum metal removal capacities (qmax) were 2.01 and 2.04 mmol/g for lead and copper, respectively, which are much higher than activated carbons and other reported biosorbents. Competitive effects were important for zinc removal, but less significant for lead and copper uptake. Organic chemical leaching from the resin was negligible. The single- and multiple-species metal ions were removed completely within approximately 90 and 130 minutes, respectively. The lead removal became much faster when its concentration was decreased and in the absence of other metal ions. Presence of competitive metal ions significantly reduced the metal uptake rate. Removal process kinetics were controlled by the mass transfer, while the local equilibrium followed an ion-exchange relationship.
Source Title: Separation Science and Technology
ISSN: 01496395
DOI: 10.1081/SS-100108352
Appears in Collections:Staff Publications

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