Effect of operating parameters on selective separation of heavy metals from binary mixtures via polymer enhanced ultrafiltration

Müslehiddinoğlu, Jale; Uludağ, Yusuf; Özbelge, H. Önder; Yılmaz, Levent

doi:10.1016/s0376-7388(97)00280-9

Cited by 100 publications

(39 citation statements)

References 32 publications

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“…This is probably due to the insignificant concentration polarization phenomena in the studied ranges of transmembrane pressure and PQ6 concentration. A similar result has been obtained by Müs-lehiddinoglu et al [27]. In Fig.…”

Section: Effects Of Pmmr and Ph On Rsupporting

confidence: 91%

Application of Polyelectrolyte‐Enhanced Ultrafiltration for Rhenium Recovery from Aqueous Solutions

Zeng

Sun

et al. 2012

Chem Eng & Technol

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Polyelectrolyte-enhanced ultrafiltration was investigated for rhenium(VII) recovery from aqueous solutions by using polyquaternium-6 (PQ6) as a complexing agent. The effects of the operating parameters on the permeate flux (J) and the rhenium rejection coefficient (R) were studied. In the process of concentration, J declines slowly and R is about 1. The concentrated solution was used for the decomplexation. It takes 10 min to achieve the decomplexation equilibrium at a chloride ion concentration of 100 mg L -1 . The decomplexation percentage reaches 45.6 %. In the diafiltration process, rhenium is extracted effectively, and the purification of the regenerated PQ6 is satisfactory. The regenerated PQ6 was used to bind rhenium(VII). The binding capacity of the regenerated PQ6 is close to that of fresh PQ6.

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Section: Effects Of Pmmr and Ph On Rsupporting

confidence: 91%

Application of Polyelectrolyte‐Enhanced Ultrafiltration for Rhenium Recovery from Aqueous Solutions

Zeng

Sun

et al. 2012

Chem Eng & Technol

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“…A flat plateau exists at very high R, followed by a linear decrease in the retention with increasing LR. Similar results have been obtained by Müslehiddinoğlu et al [20] in the study of mercury and cadmium removal using polyethyleneimine as a complexing agent. Binding capacity of polymer for the metal ion can be defined as the critical loading ratio at which R value is 0.98 [21].…”

Section: Effect Of Loading Ratio On the Extraction Of Co 2+supporting

confidence: 89%

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration process

Zeng

Liu

Nian-dong

2010

Front. Chem. Eng. China

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The extraction of cobalt ions from dilute aqueous solutions was investigated by ultrafiltration with the help of poly(acrylic acid) sodium salt (PAASS). Polysulfone and polyethersulfone hollow fiber ultrafiltration membranes were employed in this process. The kinetics of complexation reaction was studied for PAASS with Co 2+ . Results showed that, under a large excess of PAASS, it takes 65, 55 and 40 min at pH 5, 6 and 7, respectively, to get the equilibrium of complexation. The reaction kinetics can be described by a pseudo-first-order equation. Then, the effects of various parameters on the extraction of Co 2+ were examined in detail. Results indicated that loading ratio, pH value and low-molecular competitive complexing agent affect significantly cobalt rejection coefficient R. Furthermore, a concentration experiment was carried out at pH 7. With increasing volume concentration factor, membrane flux declines slowly, and R value is always about 1. The concentrated retentate was used further for a decomplexation experiment. The decomplexation ratio of cobalt-PAASS complex reaches as high as 90.1%. After the decomplexation step, a diafiltration experiment was performed at pH 2.5. Cobalt ions can be extracted satisfactorily from the retentate, and a purified PAASS is obtained.

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“…In this work, the C P represents the average chromium species concentration throughout the UF run [14][15][16]. The used membrane was immediately flushed with deionized water after UF, and then, cleaned in sequence by rinsing with 0.1 M NaOH and 100 ppm NaOCl.…”

Section: Uf Experimentsmentioning

confidence: 99%

“…These large molecules, having a larger molecular weight than the molecular weight cut off of the membrane, will be retained, while the non-complexed ions pass through the membrane. With this method, using different water-soluble polymers or introducing new functional groups to the polymer, it is possible to achieve selective separation and recovery of heavy metals with low energy requirements [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Removal of chromium ions from aqueous solutions by polymer-enhanced ultrafiltration

Aroua¹,

Zuki²,

Sulaiman³

2007

Journal of Hazardous Materials

291

130

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Effect of operating parameters on selective separation of heavy metals from binary mixtures via polymer enhanced ultrafiltration

Cited by 100 publications

References 32 publications

Application of Polyelectrolyte‐Enhanced Ultrafiltration for Rhenium Recovery from Aqueous Solutions

Application of Polyelectrolyte‐Enhanced Ultrafiltration for Rhenium Recovery from Aqueous Solutions

Experimental studies on extraction of cobalt ions from dilute aqueous solutions by using complexation-ultrafiltration process

Removal of chromium ions from aqueous solutions by polymer-enhanced ultrafiltration

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