Kinetics of cadmium ion sorption on ion exchange and chelating resins

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299908934665· OSTI ID:20019006

Bilba, D; Bilba, N; Albu, M

Cadmium sorption from aqueous solutions on sulfonic (C-150) and iminodiacetic (S-930) Purolite macroporous resins was investigated. The influence of operating variables such as initial pH, Cd(II) concentration, time and temperature on the equilibrium parameters was measured. The ion preference and sorption ability of resins, i.e., binding constant (b) and saturation capacity (x{sub m}), derived from sorption isotherm, depend on the functional group structure. The Cd(II) uptake is only particle diffusion controlled. The kinetic parameters, i.e., t{sub 1/2} values for 50% attainment of equilibrium sorption, rate constant ({bar K}) and diffusion coefficient ({bar D}) are higher on the sulfonic resin. The moving boundary particle diffusion model fits the entire ion sorption process on chelating resin, but only the initial sorption on the sulfonic resin, confirming the difference in chemistry between chelation and ion exchange.

• Research Organization: Technical Univ. of Iassy (RO)
• OSTI ID: 20019006
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 6 Vol. 17; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
CADMIUM
CHELATING AGENTS
ION EXCHANGE
ION EXCHANGE MATERIALS
PARAMETRIC ANALYSIS
PERFORMANCE
REACTION KINETICS
SORPTION
WASTE WATER
WATER TREATMENT