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

Diallo, Houda; Rabiller-Baudry, Murielle; Khaless, Khaoula; Chaufer, Bernard

doi:10.1016/j.memsci.2012.08.047

Cited by 28 publications

(25 citation statements)

References 16 publications

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“…concentration. Rejection of sulphur at the maximum transmembrane flow decreased from 80% at the highest pH 24 value evaluated (2.5) to 45% rejection at pH 1.0. This decrease was driven by: a) changes in speciation with pH, 25 which resulted in the predominance of HSO 4 at lower pH (<1.98) and of SO 4 2at higher pH (>1.98); and by b) 26 changes in the membrane acid-base properties, as free carboxylic and amine groups of the piperazine structure 27…”

Section: Resultsmentioning

confidence: 87%

“…The concentrate passed through a manometer and a flow meter. Just before the discharge 23 of the retentate to the tank, a pre-filter cartridge (100 µm, polypropylene) was placed to avoid erosion products 24 reaching the pump and to eliminate microorganisms. Permeate samples were collected by a three-way valve.…”

Section: Membrane Cross-flow Experimental Set-up 14mentioning

confidence: 99%

“…carboxylic and amine groups of the piperazine) are deprotonated and, hence, single-17 charged anions HSO 4 are less repelled by the membrane than double-charged anions SO 4 2-. However, one of the 18 greatest concerns regarding polyamide-based membranes is the low chemical resistance of the active sites in very 19 high acidic conditions, as described elsewhere [21][22][23][24]. Platt et al [21] reported that the instability of membranes 20…”

Section: Introductionmentioning

confidence: 99%

“…The chemical instability of NF45 and 21 Desal DK in nitric (5% w/w) is higher than in sulphuric acid (20% w/w) after ageing for one to three months, and 22 decreases with increasing temperature (20 to 80°C). Manis et al [22] also reported the instability of Desal DK in 2 23 M sulphuric acid solutions after ageing the membrane for two months with an increase of permeate flux and a 24 decrease of copper retention, while the MPF-34 membrane kept its properties with little variation. Navarro et al 25 [23] and Diallo et al [24] aged Desal 5DL and MPF-34 membranes, respectively, in phosphoric acid and concluded 26 that adsorbed phosphate could have an impact on selectivity by increasing polarity and modulating charge.…”

Section: Introductionmentioning

confidence: 99%

“…Manis et al [22] also reported the instability of Desal DK in 2 23 M sulphuric acid solutions after ageing the membrane for two months with an increase of permeate flux and a 24 decrease of copper retention, while the MPF-34 membrane kept its properties with little variation. Navarro et al 25 [23] and Diallo et al [24] aged Desal 5DL and MPF-34 membranes, respectively, in phosphoric acid and concluded 26 that adsorbed phosphate could have an impact on selectivity by increasing polarity and modulating charge. 27 However, ageing experiments in 2% sulphuric acid at 60°C by Tanninen et al [25] for NF270, Desal KH and Desal-5 28 DK membranes showed marginal changes in pure water flux.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 87%

Section: Membrane Cross-flow Experimental Set-up 14mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Nanofiltration in Hydrometallurgy

Manis

Soldenhoff

et al. 2021

Nanofiltration

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Comparison of acid-resistant ceramic and polymeric nanofiltration membranes for acid mine waters treatment

López

Reig

Vecino

et al. 2020

Chemical Engineering Journal

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Acid-resistant ceramic and polymeric nanofiltration (NF) membranes have been identified as relevant materials for sustainable management of acidic streams. NF properties such as a high passage of single-charged ions and high rejection of multi-charged ions make NF membranes suitable for acid recovery and metal concentration. In this work, the performance of two acid-resistant membranes: TiO2 ceramic and MPF-34 (proprietary layer) was tested with solutions mimicking acidic mine waters. Model solutions were composed by Al, Fe, Ca, Cu, Zn and rare earth elements (REEs) such as La, Dy, Sm, Nd, Pr and Yb. The effect of acidity (from pH 1.5 to 1.0), Al(III) (from 0.6 to 1.8 g/L) and Fe(III) (from 0.5 to 2.1 g/L) concentrations was studied. Both membranes allowed the transport of H+ (negative rejections were obtained), but exhibited differences related to the metallic ions transport. While MPF-34 presented metal rejections around 80% and independent on the concentration of the major components (Al(III) and Fe(III)), the TiO2 membrane provided a sequence of rejection values from 5 to 30%, with highest values for trivalent transition metals. These differences in the sequence of rejections suggested that the chemical properties of the TiO2 layer played a relevant role, and the differences in rejections could only be explained by dielectric effects. From the observed rejections, it was estimated that MPF-34 provided concentration factors for metals up to 4.2 and <1 for the H2SO4. Response to Reviewers:-Reviewer 1 We would like to thank the reviewer for her/his detailed and accurate revision of the manuscript. All the queries have been taken into account and, accordingly, the required modifications have been made. This work compared the TiO2 ceramic and polymeric nanofiltration membranes for acid recovery and metal concentration during the treatment of acid mine waters. The experimental results are of great practical significance. The topic is suitable for the journal audience. Therefore, I will recommend this work to be published in "Chemical Engineering

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

Cited by 28 publications

References 16 publications

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

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

Nanofiltration in Hydrometallurgy

Comparison of acid-resistant ceramic and polymeric nanofiltration membranes for acid mine waters treatment

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