Effect of electrolyte strength on acid separation with NF membranes

Tanninen, Jukka; Mänttäri, Mika; Nyström, Marianne

doi:10.1016/j.memsci.2007.02.042

Cited by 20 publications

(12 citation statements)

References 21 publications

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“…In Figure 6 the total electrolyte rejections determined by Tanninen et al [43], Pagès et al [25] and Reig et al [39] are compared with the results obtained in this work for the pH range from 0.3 to (both studies used sulphuric acid solutions and NF270 membrane). Rejections of sodium sulphate at pH values from 5.75 to 8 are also included for comparison [25].…”

Section: Sulphuric Acid Rejection By Aromatic Poly(piperazine) Nf270mentioning

confidence: 74%

Experimental and theoretical study of nanofiltration of weak electrolytes: SO42–/HSO4–/H+ system

López

Reig

Yaroshchuk

et al. 2018

Journal of Membrane Science

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Over recent years, nanofiltration (NF) has been considered as an effective way to improve processing steps in metallurgical and hydrometallurgy applications dealing with mixtures of metal ions in sulphuric-acid-dominated solutions. The principal advantage of NF membranes over reverse osmosis (RO) membranes is their ability to allow for a practically free passage of acid, while metallic species, especially multi-charged species, are efficiently rejected. In general, these sulphuric solutions cover a range from strongly acidic solutions with pH below 1 up to moderately acidic solutions of pH 3. Over this range, changes in the feed acidity influence both the aqueous electrolyte solution speciation (SO /HSO /H) and the membrane acidbase properties (protonation of carboxylic and amine groups). However, few studies have been published on the trans-membrane transport of inorganic species coupled to changes in their speciation as well as to the properties of the membrane phase.

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Section: Sulphuric Acid Rejection By Aromatic Poly(piperazine) Nf270mentioning

confidence: 74%

Experimental and theoretical study of nanofiltration of weak electrolytes: SO42–/HSO4–/H+ system

López

Reig

Yaroshchuk

et al. 2018

Journal of Membrane Science

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“…0.15 and 0.3 M) for a RO 23 membrane based on polyamide and a NF membrane based on polysulphide and polyethersulphone. In contrast, 24 Tanninen et al [45] reported a decrease in water permeability from 36. The effect of exposure of the NF270 membrane to acidic conditions on its hydrophilicity was evaluated by 3 determining the contact angle before and after four weeks of exposure.…”

mentioning

confidence: 91%

Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

et al. 2018

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14Acid mine drainage (AMD) is considered the main environmental problem in mining operation due to its acidity, 15 metal content (Fe, Al, Zn, Cu) and onerous associated treatment cost. However, the presence of relatively high 16 levels of added value elements (rare earth elements (REE)) could make its valorisation economically affordable. 17Membrane nanofiltration (NF) has been postulated as a potential recovery technology because it allows the 18 recovery of a sulphuric acid rich stream and a metal rich stream in one step. In this study, the performance of a 19 semi-aromatic polyamide NF membrane (NF270) in filtering model solutions containing common metals (Ca, Al, 20 Zn) in sulphuric solutions (pH 1.5-3.0) was evaluated. In a second stage, the performance was assessed with the 21 same model solutions but also containing REE. NF270 showed high rejections for metallic ions in solution, 22allowing acid permeation. Ion rejection data were used to determine membrane permeances to ions using the 23 solution-diffusion model considering reactive transport. The stability of the membrane was also studied by 24 comparing performances of a virgin membrane with an aged membrane exposed to 1 M sulphuric acid for 4 25 weeks. Physicochemical changes of membrane properties after ageing were also analysed by ATR-FTIR, AFM and 26 XPS. 27 28

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“…Because of the lack of stability of polyamide membranes (classical membrane material for NF in aqueous media) toward concentrated inorganic acids previous studies have been mainly performed on slightly concentrated solutions; the concentrations are typically less than 2 mol L À 1 . Among them are NF of nitric acid (NF 45, Dow Chemicals) up to 0.1 mol L À 1 [5] and sulfuric acid (Desal 5 DL, Desal 5 DK, GE Osmonics) up to 0.44 mol L À 1 [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, NF studies can be now performed for emerging applications with these membranes of a new generation. For instance Desal KH is a prototype membrane from GE Osmonics (not commercially available) that has been used to filter 0.44 mol L À 1 sulfuric acid at laboratory scale [9]. MPF 34 and MPF 36 membranes provided by Koch are able to filter phosphoric acid at concentration as high as 5.9 mol L À 1 [14,15].…”

Section: Introductionmentioning

confidence: 99%

On the electrostatic interactions in the transfer mechanisms of iron during nanofiltration in high concentrated phosphoric acid

Diallo

Rabiller-Baudry

Khaless

et al. 2013

Journal of Membrane Science

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Effect of electrolyte strength on acid separation with NF membranes

Cited by 20 publications

References 21 publications

Experimental and theoretical study of nanofiltration of weak electrolytes: SO42–/HSO4–/H+ system

Experimental and theoretical study of nanofiltration of weak electrolytes: SO42–/HSO4–/H+ system

Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

On the electrostatic interactions in the transfer mechanisms of iron during nanofiltration in high concentrated phosphoric acid

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