Adsorption of copper–citrate complexes on chitosan: Equilibrium modeling

Citric Acid Enhanced Copper Removal by a Novel Multi-amines Decorated Resin

“…The values of k 2 and h for Cu 2 + and CuHL 0 were one order of magnitude higher than those for CuL − and Cu 2 L 2 2− ( Table 1 ). The result implies two kinds of mechanisms: both Cu 2 + and CuHL 0 interacted with neutral amine sites through coordination 39 , while CuL − and Cu 2 L 2 2− interacted with protonated amine sites via electrostatic attraction 20 . Considering Cu and CA in all complex species was at 1:1 mole ratio, in theory, Q CA, b should be equal to the difference between Q Cu , b and Q Cu 2 + .…”

“…Lu et al . 20 and Guzman et al . 21 reported chitosan had a larger capacity for Cu (maximum ~3.5 mmol/g) from wastewaters containing citrate or tartrate.…”

Simultaneous biodegradation of Ni–citrate complexes and removal of nickel from solutions by Pseudomonas alcaliphila

“…However, when treating metal-bearing wastewater, the presence of complexes makes chemical precipitation less effective (Malik, 2004), especially when the complexes are in excess of the metals (Gyliene et al, 2004). Adsorption, ion exchange and reverse osmosis processes have been utilized for the removal of chelated metals from solutions (Gyliene et al, 2009;Juang et al, 2006;Lu et al, 2010;Ozaki et al, 2002), but no satisfactory chemical or physical methods have been developed to cheaply remove or recover chelated metals from dilute solutions. One way by which metals can be released from complexes is biodegradation (Francis et al, 1992;Thomas et al, 1998).…”

Sorption behaviour of Co(II) and Cu(II) on chitosan in presence of nitrilotriacetic acid

“…However, there are only limited studies on the sorption of metal ions from a medium containing complexing agents. The most studied metal ion in this regard, as is with most sorbents, is copper (II) [15][16][17][18][19]. Juang et al [15] studied the removal of Cu(II) from solutions containing chelants EDTA, citrate, tartaric acid and gluconate and found an optimum pH range for each complexing agent based on metal ion sorption results.…”

“…Juang et al [15] studied the removal of Cu(II) from solutions containing chelants EDTA, citrate, tartaric acid and gluconate and found an optimum pH range for each complexing agent based on metal ion sorption results. Lu et al [16] modeled the sorption of copper-citrate on chitosan through theoretical calculations to develop a mathematical model to predict the copper adsorptions at varying pH values and copper to citrate ratios. But, in these studies, the sorption of the complexing ligands was not monitored and the conclusions were drawn based on the results obtained from the metal ion sorption.…”