Concentration and separation of aqueous solutions of Cu2+, Ni2+, Fe3+ by dextran

The removal of Fe(III), Cu(II), and Cd(II) ions from aqueous solutions was investigated with a crossflow filtration technique. Alginic acid (AA)/cellulose composite membranes were used for retention. In the filtration of Fe(III) solutions, the effects of the crossflow velocity, applied pressure, AA content of the membranes, and pH on the retention percentage and the permeate flux were examined. The maximum retention percentage was found to be 89% for a 1 Â 10 À4 M Fe(III) solution at the flow velocity of 100 mL/min and the pressure of 60 kPa with 0.50% (w/v) AA/cellulose composite membranes at pH 3. Aqueous solutions of Cu(II) and Cd(II) were filtered at the flow velocity of 100 mL/min and pressure of 10 kPa. The effects of the AA content of the membranes and pH of the waste medium on the retention percentage and the permeate flux were determined. For 1 Â 10 À4 M Cu(II) and Cd(II) solutions, the maximum retention percentages were found to be 94 and 75%, respectively, at pH 7 with 0.50% (w/v) AA/cellulose composite membranes. When metalion mixtures were used, the retention percentages of Fe(III), Cu(II), and Cd(II) were found to be 89, 48, and 10%, respectively, at pH 3 with 0.50% (w/v) AA/cellulose composite membranes.

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“…Similar results concerning the effect of pH on the retention percentage and permeate flux have been reported in the literature 4, 22…”

Section: Resultssupporting

confidence: 90%

“…Şolpan and Şahan22 studied the separation of Cu(II) and Ni(II) from Fe(III) ions by complexation with AA and with a suitable membrane. They concluded that as the pH increased, the retention of metallic ions increased.…”

Section: Resultsmentioning

confidence: 99%

Crossflow filtration of iron(III), copper(II), and cadmium(II) aqueous solutions with alginic acid/cellulose composite membranes

Çifci

Şanlı

2009

J of Applied Polymer Sci

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“…Ha et al [30] used the base inhibitor imidazole to improve conductivity and measurements suggested that the additive co-ordinated with the Fe 3þ centres in the oxidant, which in turn lowered the apparent reactivity of the tosylate. Since the steric nature of PEG and derivatives of PEG are well known, [31,32] and other studies [33,34] have demonstrated their ability to form metal ion complexes, it is reasonable to think that PEG-ran-PPG may co-ordinate in a similar manner in the process described here. This would account for the apparent reduction in oxidant reactivity (i.e., comparing surfactant free and 4 wt.-% loaded samples) as demonstrated by the extended slow polymerisation rate shown in Figure 4.…”

mentioning

confidence: 79%

Influence of PEG‐ran‐PPG Surfactant on Vapour Phase Polymerised PEDOT Thin Films

Fabretto

Müller

Zuber

et al. 2009

Macromol. Rapid Commun.

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The oxidant, Fe(III) tosylate, was used in the vapour phase polymerisation (VPP) of PEDOT. The amphiphilic co-polymer poly(ethylene glycol-ran-propylene glycol) was added and its influence examined. Both the PEDOT conductivity and optical contrast range increased with the inclusion of the co-polymer, with the maximum being recorded at 4 wt.-%. Loadings higher than this resulted in a systematic decrease in both conductivity and optical contrast. Evidence indicates that in addition to the beneficial anti-crystallisation effect to the oxidant layer, the co-polymer also reduces the effective reactivity of the oxidant, as demonstrated by slower polymerisation rates. Confirmation of the change in polymerisation rate was obtained using a quartz crystal microbalance (QCM). The slower polymerisation rate results in higher conductivity and optical contrast; however, XPS data confirmed that the co-polymer remained within the PEDOT film post-washing and this result explains why the performance decreases at high surfactant loadings.

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“…The rejection of Cu 2+ and Ni 2+ from Fe 3+ ions by complexation with alginic acid has been attempted 10. Other researchers studied the effect of operating parameters on selective separation of heavy metals from binary mixtures via polymer‐enhanced UF 11.…”

Section: Introductionmentioning

confidence: 99%

Polyurethane and sulfonated polysulfone blend ultrafiltration membranes: II. Application studies

Malaisamy

Mohan

Rajendran

2003

Polymer International

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Ultrafiltration membranes are largely being applied for macromolecular and heavy metal ion separations from aqueous streams. Polyurethane‐ and sulfonated‐ polysulfone‐based membranes prepared in the absence and presence of the polymeric additive, poly(ethylene glycol) 600, in various compositions, were subjected to the rejection of macromolecular proteins, such as bovine serum albumin, egg albumin, pepsin and trypsin. Toxic heavy metal ions such as Cu2+, Ni2+, Cd2+ and Zn2+ were subjected to rejection by the blend membranes by complexing them with a polymeric ligand, polyethyleneimine. The effects of polymer blend compositions and additive concentrations on the rejection and permeate flux of both proteins and metal ions are discussed. The rejection and permeate flux efficiencies of the blend membranes are compared with pure sulfonated polysulfone membranes. © 2003 Society of Chemical Industry

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Concentration and separation of aqueous solutions of Cu²⁺, Ni²⁺, Fe³⁺ by dextran

Cited by 13 publications

References 5 publications

Crossflow filtration of iron(III), copper(II), and cadmium(II) aqueous solutions with alginic acid/cellulose composite membranes

Crossflow filtration of iron(III), copper(II), and cadmium(II) aqueous solutions with alginic acid/cellulose composite membranes

Influence of PEG‐ran‐PPG Surfactant on Vapour Phase Polymerised PEDOT Thin Films

Polyurethane and sulfonated polysulfone blend ultrafiltration membranes: II. Application studies

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