Diffusivity of Cu[sup 2+] in calcium alginate gel beads

Journal Article · Thu Mar 25 00:00:00 EST 1993 · Biotechnology and Bioengineering; (United States)

DOI:https://doi.org/10.1002/bit.260410710· OSTI ID:6450098

Chen, Dong; Lewandowski, Z; Roe, F; Surapaneni, P ^[1]

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1. Montana State Univ., Bozeman (United States)

A linear absorption model (LAM) is used to describe the process of metal binding to spherically shaped biopolymer particles. The LAM was solved using a numerical algorithm which calculates diffusivities of metal ions in biopolymer gels. It assumes attainment of rapid metal-biopolymer binding equilibrium accompanied by rate limiting diffusion of the metal ions through the gel. The model was tested using batch experiments in which copper (Cu[sup 2+]) binding with calcium alginate beads was investigated. Biopolymer density in the beads was varied between 2% and 5%. The diffusion coefficient of Cu[sup 2+] calculated from the LAM ranged from 1.19 [times] 10[sup [minus]9] to 1.48 [times] 10[sup [minus]9]m[sup 2]s[sup [minus]1] (average 1.31 [plus minus] 0.21 [times] 10[sup [minus]9]m[sup 2]s[sup [minus]1]), independent of biopolymer density. The LAM has theoretical advantages over the shrinking core model (shell progressive model). The latter calculated an unreasonable exponential increase in the diffusion coefficient as density of alginate polymer in the bead increased.

• OSTI ID: 6450098
• Journal Information: Biotechnology and Bioengineering; (United States), Vol. 41:7; ISSN 0006-3592
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ALGINATES
PERMEABILITY
COPPER
ION EXCHANGE CHROMATOGRAPHY
MATERIALS RECOVERY
ABSORPTION
ALGORITHMS
AQUEOUS SOLUTIONS
BIOLOGICAL MATERIALS
CALCIUM
CATIONS
CHEMICAL BONDS
DECONTAMINATION
DIFFUSION
MATHEMATICAL MODELS
POLYMERS
ALKALINE EARTH METALS
CHARGED PARTICLES
CHROMATOGRAPHY
CLEANING
DISPERSIONS
ELEMENTS
IONS
MANAGEMENT
MATERIALS
MATHEMATICAL LOGIC
METALS
MIXTURES
PROCESSING
SEPARATION PROCESSES
SOLUTIONS
SORPTION
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)