The role of electrostatic interactions on the rejection of organic solutes in aqueous solutions with nanofiltration

Verliefde, Arne; Cornelissen, Emile; Heijman, S.G.J.; Verberk, J.Q.J.C.; Amy, Gary L.; Bruggen, Bart Van der; Dijk, J. C. van

doi:10.1016/j.memsci.2008.05.022

Cited by 219 publications

(127 citation statements)

References 43 publications

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“…Similar observation was made in the current study which may be accounted that the colloid substances in the leather industrial effluents usually carry negative electrical charges, whereas the membrane possesses a lot of positive charge due to the incorporation of chitosan nanoparticles in the polymer membrane matrix which has the capability of adsorbing particles leading to destabilization and thus also led to the assumption that the membrane acts as a adsorptive membrane. The effect of pH on chromium rejection plays an important role because the charges of both salt ions and membrane vary with pH (Verliefde et al 2008). In a study done by Muthukrishnan and Guha (2008), it was found out that the rejection of chromium greatly increased when pH rose from 2 to 7, as more bivalent CrO 4 2− /Cr 2 O 7 2− ions were generated and the polyamide NF membrane was more negatively charged at higher pH.…”

Section: Effect Of Phmentioning

confidence: 99%

Removal of heavy metal chromium from tannery effluent using ultrafiltration membrane

Vinodhini¹,

Sudha²

2016

Text Cloth Sustain

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The present study was aimed to fabricate a novel ultrafiltration membrane using cellulose acetate, nanochitosan, and polyethylene glycol of ratio 1:2:2 by phase inversion method. Analytical techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffractometer (XRD), and scanning electron microscopy (SEM) have been employed to characterize the prepared membrane. FTIR and XRD results revealed the formation of blended membrane with increased amorphous nature. SEM studies exhibited the rough surface with numerous pores. The prepared membrane was also characterized for its ultrafiltration performance by membrane compaction, pure water flux, water content, and porosity. The results showed that the membrane obtained a pure water flux of 25.32 l/m 2 h. The water content was found to be 24 % and a high porosity of 83 % was obtained which showed the membrane's high hydrophilicity and more porous nature. The main focus of the present study was toxic hexavalent chromium removal from tannery effluent using the prepared hydrophilic membrane, which causes various adverse effects. The effect of pH of the solution (viz., pH 5, 7, and 9), membrane thickness (0.1 and 0.2 mm), and the applied pressure (50 and 100 kPa) were studied which are the key factors in determining the efficiency of the prepared membrane in remediation of tannery effluent. The results showed high percentage removal of chromium at pH 7 using 0.2 mm thickness at 100 kPa. The physicochemical parameters of the tannery effluent were also found to be reduced.

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Section: Effect Of Phmentioning

confidence: 99%

Removal of heavy metal chromium from tannery effluent using ultrafiltration membrane

Vinodhini¹,

Sudha²

2016

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“…The membranes were compacted prior to each filtration experiment at 18 bar using Milli-Q water until the permeate flux reached a constant value. A feed solution containing 1 mM CaCl 2, 20 mM NaCl and 1 mM NaHCO 3 was used to simulate the ionic composition of typical secondary treated effluent and similar compositions have been used elsewhere by other researchers [23,24]. 750 µg/L of each TrOC was added in the feed solution in all filtration experiments.…”

Section: Filtration Setup and Experimental Protocolmentioning

confidence: 99%

Influence of formulated chemical cleaning reagents on the surface properties and separation efficiency of nanofiltrationmembranes

Simon

Price

Nghiem

2013

Journal of Membrane Science

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This study investigated the impact of two caustic and one acidic cleaning formulations (namely MC11, PC98, and MC3, respectively) on the properties and separation efficiency of three different nanofiltration (NF) membranes (namely NF270, NF90 and TFC-SR100). Overall, the impact of chemical cleaning on surface properties and rejection was membrane and cleaning reagent specific. It was driven mostly by conformational changes of the membrane polymeric active skin layer in response to an extreme caustic or acidic environment and to a certain extent by the adsorption of cleaning additives (e.g., surfactants and chelating reagents). The influence of chemical cleaning on the membrane properties and separation efficiency was most severe for the NF270 due to its loose and very thin active skin layer. Caustic cleaning using either the MC11 or PC98 formulations led to a significant increase in the permeability and a considerable decrease in the rejection of both inorganic salts and trace organic contaminants by the NF270 membrane. In contrast, acidic cleaning using the MC3 formulation caused a small decrease in the permeability of the NF270 membrane. The influence of chemical cleaning on the NF90 and TFC-SR100 membranes was much less significant, possibly because of their thicker and denser active skin layer. The results reported here demonstrated that the impact of chemical cleaning was not permanent and could be minimised by adapting an appropriate strategy involving caustic cleaning followed by acidic cleaning. FTIR analyses of the virgin and cleaned membranes showed no discernible impact of chemical cleaning on the bonding structure of all three membranes investigatedhere. AbstractThis study investigated the impact of two caustic and one acidic cleaning formulations (namely MC11, PC98, and MC3, respectively) on the properties and separation efficiency of three different nanofiltration (NF) membranes (namely NF270, NF90 and TFC-SR100).Overall, the impact of chemical cleaning on surface properties and rejection was membrane and cleaning reagent specific. It was driven mostly by conformation changes of the membrane polymeric active skin layer in response to an extreme caustic or acidic environment and to a certain extent by the adsorption of cleaning additives (e.g. surfactants and chelating reagents). The influence of chemical cleaning on the membrane properties and separation efficiency was most severe for the NF270 due to its loose and very thin active skin layer. Caustic cleaning using either the MC11 or PC98 formulations led to a significant increase in the permeability and a considerable decrease in the rejection of both inorganic salts and trace organic contaminants by the NF270 membrane. In contrast, acidic cleaning using the MC3 formulation caused a small decrease in the permeability of the NF270 membrane. The influence of chemical cleaning on the NF90 and TFC-SR100 membranes was much less significant, possibly because of their thicker and denser active skin layer. The results reported here demonstrated ...

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“…Therefore, the electrostatic interaction between the charged organic solutes and the surface of the charged membrane can influence the rejection of organics. Studies on electrostatic interaction have reported that an increase in the rejection of negatively charged organic solutes resulted from an electrostatic repulsion between the negatively charged membrane and the negatively charged organic solute [28][29]. This rejection, however, is based on the initial feed pH, since both the surface change on the surface of the membrane and the organic solute vary according to the pH (through a dissociation of the functional groups as a function of their pKa).…”

Section: Membrane Characterizationmentioning

confidence: 99%

Removal of dissolved organics from produced water by forward osmosis

Abousnina

Nghiem

2013

Desalination and Water Treatment

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A B S T R A C TThis study investigated the performance of the forward osmosis (FO) process for treating produced water. Water permeate flux and reverse salt flux (RSF) were examined at different feed pH values and operating configurations (i.e. FO, pressure retarded osmosis (PRO), and reverse osmosis (RO) modes). Acetic acid was selected as a model organic acid to present the dissolved organic fraction in produced water. Results reported here indicate that only membranes specifically designed for FO applications can be used in the FO and PRO modes. Due to the internal concentration polarization phenomenon, the PRO mode resulted in a higher water permeate flux and RSF than those in the FO mode. Acetate rejection was pH dependent in both the FO and RO modes. Furthermore, in the RO mode, acetate rejections by the FO membranes were higher than their nanofiltration counterparts. Results reported here suggest that FO can be a viable treatment option for the removal of dissolved organics from produced water.

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The role of electrostatic interactions on the rejection of organic solutes in aqueous solutions with nanofiltration

Cited by 219 publications

References 43 publications

Removal of heavy metal chromium from tannery effluent using ultrafiltration membrane

Removal of heavy metal chromium from tannery effluent using ultrafiltration membrane

Influence of formulated chemical cleaning reagents on the surface properties and separation efficiency of nanofiltrationmembranes

Removal of dissolved organics from produced water by forward osmosis

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