Removal of trivalent chromium(III) from solution by biosorption in cork powder

Abstract

The removal of trivalent chromium from solutions using biosorption in cork powder is described. The adsorption isotherm was determined, along with the effect of different variables, such as biomass particle size, solid-liquid ratio, reaction time, metal concentration and pH, on the efficiency of chromium removal. It was concluded that the adsorption is slow and favoured by an increase in pH. Therefore, using a solid-liquid ratio of 4 g dm À3 it is possible to reduce the chromium concentration in the solution from 10 mg dm À3 to less than 1.5 mg dm À3 in 2 h at 22°C. The kinetic studies verified that the sorption of chromium by cork was described by a second-order model. The elution results showed that 50% of the chromium bound to the cork was eluted using 0.5 mol dm À3 H 2 SO 4 and that cork maintains its binding capacity over four cycles of biosorption/elution.

Removal of Pb(II) from solution using cellulose‐containing materials

“…Similar was the observation by Ho et al 13 for removal of Pb(II) using peat and Machado et al 22 for the removal of Cr(III) by biosorption on cork powder. The initial sorption rate, h, calculated from the intercept of straight lines of second order plots was constant in the case of undyed coir whereas it did not follow any particular trend in the case of dyed coir.…”

Adsorption of fluoride, chloride, bromide, and bromate ions on a novel ion exchanger

“…Ho [29] was the first to develop the pseudo-second-order kinetic expression for sorption systems, in which chemical sorption is the rate-limiting step; since its development this model has been applied in a number of studies [30][31][32] including those for sorption of anions [32]. The pseudo-first-order model developed by Lagergren (1998) did not work as well in our experimental data.…”

Cork: properties, capabilities and applications

“…148 Studies have reported the advantages of cork for the biosorption of heavy metals such as Cu(II), Zn(II), Cr(VI) and Ni(II). 145,146,149,150 At low concentrations, these chemical contaminants are difficult to remove from aqueous solutions. The more common removal techniques used, 151 e.g.…”