Cooperative Biosorption of Copper on Calcium Alginate Enclosing Iminodiacetic Type Resin

Abstract

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.

Assessing the Importance of Organic Matrix Materials in Biofilm Chemical Reactivity: Insights from Proton and Cadmium Adsorption onto the Commercially Available Biopolymer Alginate

“…The total proton reactivity of purified alginate reported here is comparable to the concentration of carboxyl sites determined by titration for alginate elsewhere (1.78 mmol/g; Fatin-Rouge et al 2006;1.96 mmol/g;Jodra and Mijangos 2003), but is lower than discrete site concentrations reported for various natural organic matter (4-24 mmol/g; Smith and Kramer 1999) (Table 3). This concentration is comparable to the average bacterial cell surface site concentration (0.32 mmol/wet gram, or approximately 2.56 mmol/dry gram, based on an average of 36 bacteria and consortia and a wet/dry weight ratio of 8; Borrok et al 2005), but is restricted in proton reactivity to the pH range 3.5-5.5, in contrast to bacterial cells where the surface organic functional groups display a range of acidity constants corresponding to a variety of surface moieties (i.e., phosphoryl, sulfahydryl, amino, phenol, hydroxyl).…”

Barium alginate caged Fe3O4@C18 magnetic nanoparticles for the pre-concentration of polycyclic aromatic hydrocarbons and phthalate esters from environmental water samples

“…Alginate is a polysaccharide that comprises homopolymeric and heteropolymeric chains of ␤-d-mannuronic and ␣-l-guluronic acids [16]. Bivalent cation, such as Ca 2+ , Sr 2+ , and Ba 2+ can complex with the guluronic acid blocks of two neighboring alginate polymers, which yields the cross-linking of alginate polymers to form an extended gel network [17].…”

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

“…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…”