Effect of pH on electrokinetic and electrochemical parameters of both sub-layers of composite polyamide/polysulfone membranes

Ariza, Manuel R. Gómez; Cañas, Alicia; Malfeito, Jorge J.; Benavente, J.

doi:10.1016/s0011-9164(02)00733-6

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…The isoelectric point was measured at 3.7 and 2.8 for HF–O and HF–C membranes, respectively. The isoelectric point around pH 2–4 was expected due to the nature of the polyamide and the presence of the carboxylic groups at the surface of the polyamide [50]. The shift in the isoelectric point after membrane chlorination could be explained as a side effect of the chlorination post-treatment.…”

Section: Resultsmentioning

confidence: 99%

Role of Operating Conditions in a Pilot Scale Investigation of Hollow Fiber Forward Osmosis Membrane Modules

et al. 2019

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Although forward osmosis (FO) membranes have shown great promise for many applications, there are few studies attempting to create a systematization of the testing conditions at a pilot scale for FO membrane modules. To address this issue, hollow fiber forward osmosis (HFFO) membrane modules with different performances (water flux and solute rejection) have been investigated at different operating conditions. Various draw and feed flow rates, draw solute types and concentrations, transmembrane pressures, temperatures, and operation modes have been studied using two model feed solutions—deionized water and artificial seawater. The significance of the operational conditions in the FO process was attributed to a dominant role of concentration polarization (CP) effects, where the selected draw solute and draw concentration had the biggest impact on membrane performance due to internal CP. Additionally, the rejection of the HFFO membranes using three model solutes (caffeine, niacin, and urea) were determined under both FO and reverse osmosis (RO) conditions with the same process recovery. FO rejections had an increase of 2% for caffeine, 19% for niacin, and 740% for urea compared to the RO rejections. Overall, this is the first extensive study of commercially available inside-out HFFO membrane modules.

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Section: Resultsmentioning

confidence: 99%

Role of Operating Conditions in a Pilot Scale Investigation of Hollow Fiber Forward Osmosis Membrane Modules

et al. 2019

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“…(7) the ratio K B /K A is obtained close to 250 (m 3 /mol) 2 . Finally, K A = 10 −3 mol/m 3 is chosen in order to obtain a reasonable dissociation degree of the polymer [35] (values are reported in Tables 3 and 4). …”

Section: Model Application and Resultsmentioning

confidence: 99%

“…(29)) approaches unity in the pH range investigated, the remaining relevant membrane parameters are the products (X 1MAX K A ) and (X 1MAX K B ), as indicated in the following by Eqs. (35).…”

Section: Model Application and Resultsmentioning

confidence: 99%

The role of the electrolyte on the mechanism of charge formation in polyamide nanofiltration membranes

Bruni

Bandini

2008

Journal of Membrane Science

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“…Increasing the pH increased the negative surface charge of the membrane as confirmed by others (Braghetta et al, 1997;Deshmukh and Childress, 2001;Lee et al, 2002;Tanninen et al, 2002;Yoon et al, 2002), which results in increased electrostatic repulsion between a negatively charged solute and membrane and consequently rejects more solute from water. Conversely, it was determined that the presence of counter ions (Na þ , K þ , Ca 2þ , and Mg 2þ ) in feed water can decrease the membrane rejection of negatively charged solute (Braghetta et al, 1997;Ariza et al, 2002;Yoon et al, 2002).…”

Section: Separation and Fouling Of Nanofiltrationmentioning

confidence: 99%

Treatment of Micropollutants in Water and Wastewater

Virkutytė

Varma

2010

wio

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The Integrated Environmental Technology Series addresses key themes and issues in the field of environmental technology from a multidisciplinary and integrated perspective.An integrated approach is potentially the most viable solution to the major pollution issues that face the globe in the 21st century.World experts are brought together to contribute to each volume, presenting a comprehensive blend of fundamental principles and applied technologies for each topic. Current practices and the state-of-the-art are reviewed, new developments in analytics, science and biotechnology are presented and, crucially, the theme of each volume is presented in relation to adjacent scientific, social and economic fields to provide solutions from a truly integrated perspective.The Integrated Environmental Technology Series will form an invaluable and definitive resource in this rapidly evolving discipline.

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Effect of pH on electrokinetic and electrochemical parameters of both sub-layers of composite polyamide/polysulfone membranes

Cited by 18 publications

References 8 publications

Role of Operating Conditions in a Pilot Scale Investigation of Hollow Fiber Forward Osmosis Membrane Modules

Role of Operating Conditions in a Pilot Scale Investigation of Hollow Fiber Forward Osmosis Membrane Modules

The role of the electrolyte on the mechanism of charge formation in polyamide nanofiltration membranes

Treatment of Micropollutants in Water and Wastewater

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