Chromium (VI) uptake by grape stalks wastes encapsulated in calcium alginate beads: equilibrium and kinetics studies

Fiol, Núria; Poch, Jordi; Villaescusa, Isabel

doi:10.3184/095422904782775153

Cited by 37 publications

(21 citation statements)

References 23 publications

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“…The fast kinetics of Cr(III) suggest that ion exchange could be one of the mechanisms responsible for trivalent chromium uptake. Indeed, Araújo and Teixeira (1997) who studied Cr(III) uptake by calcium alginate beads postulated that at low and In the case of Cr(VI), we already reported in a previous work that in this form, chromium is mainly sorbed on the grape stalks via metal diffusion into the particle of the sorbent with a consequent slow kinetics (Fiol et al 2004). Taking into account the reported results in the above mentioned studies, Cr(III) is expected to be mainly sorbed on the calcium alginate and Cr(VI) on the grape stalks.…”

Section: Effect Of Contact Timementioning

confidence: 91%

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Chromium sorption on grape stalks encapsulated in calcium alginate beads

2006

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A novel sorbent based on 2% grape stalk wastes encapsulated in calcium alginate beads was investigated for the removal of Cr(VI) and Cr(III) from aqueous solutions. The sorbent proved to be efficient for chromium removal in both hexavalent and trivalent forms from aqueous solution at pH 3.0. In binary mixtures, the presence in solution of one of the forms enhances the sorption of the other which results in an increase of the amount of total chromium removed. This study suggests that the proposed sorbent can be used for the removal of chromium from wastewaters through a cost-effective and environmentally friendly process.

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Section: Effect Of Contact Timementioning

confidence: 91%

“…Then they were stored in distilled water until use. The experimental set-up used to get the beads has been previously shown elsewhere (Fiol et al 2004). …”

Section: Preparation Of the Beadsmentioning

confidence: 99%

Chromium sorption on grape stalks encapsulated in calcium alginate beads

2006

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“…The beads were prepared according to Fiol et al [13]. A 1% (w/v) sodium alginate gel was prepared by dissolving 1 g of the sodium salt in 100 mL of hot (65 ± 5 • C) distilled water.…”

Section: Bead Formation and Particle Size Characterizationmentioning

confidence: 99%

“…The most frequently used alginate species is a sodium salt of an alginic acid extracted from brown algae [11,13,14]. The dropwise addition of sodium alginate (SA) to the cross-linking solution of CaCl 2 immediately produces a calcium alginate (CA) bead.…”

Section: Introductionmentioning

confidence: 99%

Biosorbent encapsulation in calcium alginate: Effects of process variables on Cr(VI) removal from solutions

Šillerová

Komárek

Liu

et al. 2015

International Journal of Biological Macromolecules

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“…The ability of biopolymers (cross-linked or not) to bind a large variety of metals is supported by many studies (Chen et al, 1993;Etemadi et al, 2003;Knox et al, 2008 a, b). The capacity of alginate as a crosslinked product (calcium alginate) for Cr(VI) uptake was demonstrated by Fiol et al (2004), who obtained an uptake of 86.42 mmol of Cr(VI) per L of wet sorbent volume using grape stalk wastes encapsulated into calcium alginate. The Cr(VI) removal ability of cross-linked calcium alginate was also shown by Araujo and Teixeira (1997), and its ability to bind Cu was shown by Chen et al (1990 and and Wan et al (2004).…”

Section: Introductionmentioning

confidence: 99%