Addition of copper-sequestering agents to alginate gel to enhance copper recovery from aqueous media

Jang, Larry K.; Nguyen, Duy V.; Kolostyak, Kevin; Geesey, Gill G.

doi:10.1016/0043-1354(95)00079-z

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…The gel-forming property of alginate has led to its use not only as an immobilization medium for enzymes, cellules, and other organulles ( , ) but also (a) for EDTA complexing agent and the green algae Mycrocystis ( , ) and an iminodiacetic type ion-exchange resin () in order to increase copper retention, (b) for activated carbon ( , ) and a nonpolar adsorbent resin () in order to increase organic adsorption, and (c) for biomass for removing heavy metals (). This biopolymer therefore enables gel beads to be prepared with physical and chemical characteristics to be adapted to the requirements of processes that could be used to recover different solutes.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Biosorption of Copper on Calcium Alginate Enclosing Iminodiacetic Type Resin

Jodra

Mijangos

2003

Environ. Sci. Technol.

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Composite gels of calcium alginate containing iminodiacetic type resin were prepared as a chemical analogue of biological tissues and membrane such as the cell wall. This chemical model was applied in copper biosorption from synthetic aqueous solutions. Experimental data on the composite were compared to those obtained for the biopolymer and the iminodiacetic-type resin separately and fitted into the ion exchange equilibrium model proposed in this work, which basically assumes that metal retention is the sum of the metal loaded onto the biopolymer and onto the resin. This model is tested with experimental data on copper biosorption on composite gels, including the equilibrium expressions of all the ionic species that are present in the system, the fraction of metal enclosed in the gel fluid, the gel volume variation, and the Donnan equilibrium theory. Another simplified model that only requires one equilibrium constant for each metal in the resin is shown to fit the results of the experiment fairly well, but it proves necessary to include an empirical parameter n into the equilibrium equation of copper in the resin to obtain the best fit of experimental data.

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Section: Introductionmentioning

confidence: 99%

Cooperative Biosorption of Copper on Calcium Alginate Enclosing Iminodiacetic Type Resin

Jodra

Mijangos

2003

Environ. Sci. Technol.

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“…The cyanobacteria Microcystis aeruginosa and Microcystis flos-aquae exist in multicellular aggregates which are surrounded by a colonial capsule or exopolymeric matrix that can adsorb substantial amounts of various metal ions (1,17,20,21). Metal accumulation by Microcystis has been reported for field samples (1,10,11,25), axenic cultures (17,18,20,21), and purified exopolymers (2,17,20,21).…”

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confidence: 99%

Effects of Cellular Metabolism and Viability on Metal Ion Accumulation by Cultured Biomass from a Bloom of the Cyanobacterium Microcystis aeruginosa

Parker

Mallick

et al. 1998

Appl Environ Microbiol

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The sorption of nickel, cadmium, and copper by cultured biomass from a naturally occurring bloom of Microcystis aeruginosa was demonstrated in two systems: cells suspended in culture medium and cells immobilized in alginate. Incubation in the absence of light, in the presence of metabolic inhibitors, and at 4°C did not substantially decrease the copper accumulation by cells in culture medium. Heat-killed, formaldehydetreated, and air-dried biomass samples sorbed nearly as much (or in some cases slightly more) copper as did viable samples.

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“…This enclosing technique has also been used in other processes, such as ion exchange and adsorption. Jang and co‐workers22–24 demonstrated that the immobilisation of EDTA or Microcystis algae in alginate gels improves the retention of metals. Good results were also obtained for copper uptake from synthetic solutions with calcium alginate gels enclosing the resin Lewatit TP‐20725, 26 and also for phenol uptake with mixed alginate–active carbon composites and the alginate–adsorbent resin OC‐1064 27, 28…”

Section: Introductionmentioning

confidence: 99%

Copper and cadmium extraction from highly concentrated phosphoric acid solutions using calcium alginate gels enclosing bis(2,4,4‐trimethylpentyl)thiophosphinic acid

Ocio

Mijangos

Elizalde

2006

J of Chemical Tech & Biotech

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The availability of alginate gels enclosing Cyanex 302 [bis(2,4,4-trimethylpentyl)thiophosphinic acid] for the uptake of cadmium and copper from highly concentrated solutions of industrial phosphoric acid wet process phosphoric acid (WPA)] was studied. For this purpose, beads of alginate gels enclosing microdrops of kerosene solutions of the industrial extractant Cyanex 302 at different concentrations were prepared. The experimental procedure gives rise to a composite bead in which alginate is the continuous phase and the organic extractant forms the discrete homogeneously distributed phase within the bead. The equilibrium in this three-phase system (phosphoric acid-extractant solution-alginate gel) was modelled in terms of the corresponding distribution factors, the main chemical reactions and their equilibrium constants. Retention isotherms of both metal ions were obtained experimentally at four concentrations (1.0, 2.5, 5.0 and 7.5 mol L −1 ) of pure phosphoric acid. High metal removal efficiency, due to liquid-liquid extraction processes, was observed even in the most acidic conditions. High values of the extraction constants were estimated, with the distribution coefficients between aqueous and alginate phase being near unity. Finally, the results obtained with industrial WPA are in close agreement with those predicted by the physicochemical model developed in synthetic media.

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Addition of copper-sequestering agents to alginate gel to enhance copper recovery from aqueous media

Cited by 9 publications

References 9 publications

Cooperative Biosorption of Copper on Calcium Alginate Enclosing Iminodiacetic Type Resin

Cooperative Biosorption of Copper on Calcium Alginate Enclosing Iminodiacetic Type Resin

Effects of Cellular Metabolism and Viability on Metal Ion Accumulation by Cultured Biomass from a Bloom of the Cyanobacterium Microcystis aeruginosa

Copper and cadmium extraction from highly concentrated phosphoric acid solutions using calcium alginate gels enclosing bis(2,4,4‐trimethylpentyl)thiophosphinic acid

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