Kinetic Modeling of Copper Biosorption by Immobilized Biomass

Abstract

The kinetic modeling of copper biosorption by Arthrobacter sp. immobilized in a hydroxyethyl methacrylate-based matrix is reported in this work. The resin−biomass complex (RBC) has been used for copper biosorption in different conditions according to a factorial experiment. Factors investigated were cross-linker (trimethylolpropane trimethacrylate) concentration, biomass concentration in the solid, and particles' granulometry. A maximum copper specific uptake of about 7 mg of Cu/g of biomass (dry weight) has been observed, in the case of a RBC with the following characteristics: 2% (w/w) cross-linker concentration, 8% (w/w) biomass concentration, and 425−750 μm granulometry. The shrinking core model has been used for the fitting of experimental data. A good fit has been found in the case of controlling intraparticle diffusion in all experimental trials. The copper diffusion coefficient in RBC has been estimated from the slope of the regression lines. Values obtained for the diffusion coefficients do not differ from one another with respect to the estimated standard error. An average apparent copper diffusion coefficient of about 3 × 10-6 cm2 /s has been found.

Biosorción de iones cobre con biomasa de algas y orujos deshidratados

“…Al usar biosólido para eliminar cobre desde soluciones acuosas Sarioglu et al [24] muestran que las captaciones no son alteradas significativamente para rangos de concentraciones del biosorbente entre 3 a 9 g/l. Por otra parte, Vegliò et al [31] estudian a diferentes pH el efecto de la concentración de residuos de aceitunas molidos en dosis de 1 a 100 g/l sobre la concentración final de cobre en la solución, obteniéndose una disminución desde 30 a 8 mg/l al incrementarse la dosis del biosorbente. Ellos señalan que en pH 5,5 se obtienen eliminaciones de cobre de 20 %, 52 % y 85 % al utilizar 1, 10 y 100 g/l de estos residuos respectivamente.…”

Kinetic Study of Lead Adsorption to Composite Biopolymer Adsorbent

“…The shrinking core model, which had been applied to find the apparent diffusivity of metal ions in ion exchange resins (9), calcium alginate beads (1, 10, 11), and a biosorbent (12), was applied to the rate process of lead adsorption to HA-gel particles. The model is based on the following assumptions: the adsorption rate process is controlled by the diffusion of adsorbate ions through the reacted shell in the adsorbent particles (particle diffusion control), and the shrinkage of unreacted shell is much slower than the mass transfer rate of adsorbate ions towards the unreacted shell surface.…”

“…For this purpose, spherical adsorbents which had average radii of 0.12, 0.15, and 0.16 cm, and a membranous adsorbent which had an average thickness of 0.0216 cm were prepared. Based on the shrinking core model (1,(9)(10)(11)(12), the rate process of lead adsorption to the composite biopolymer adsorbents will be discussed.…”

Adsorption of Heavy Metal Ions to Floc-Type Biosorbents

“…Thus many types of biomass have been investigated for use in this application (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)). An abundant source of potentially metal-sorbing biomass is microorganisms.…”

“…However, microorganisms have a serious difficulty in the practical use, that application, the metal adsorption performance of microorganisms immobilized in a polymeric matrix, silica gel, or other supports has been investigated (1,4,6,10).…”