The chlorination mechanism of integrally asymmetric cellulose triacetate (CTA)-based and thin film composite polyamide-based forward osmosis membrane

Nguyen, Thi Phuong Nga; Jun, Byung-Moon; Kwon, Young‐Nam

doi:10.1016/j.memsci.2016.09.020

Cited by 34 publications

(12 citation statements)

References 38 publications

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“…The results of the membrane electrokinetic characterization are displayed in Figure 7. The reported isoelectric points for CTA membranes are usually below pH 4 [54,55]. The M2, M3…”

Section: M2 M3mentioning

confidence: 99%

“…and M4 membranes were found to have isoelectric points around 4.6, 6.1 and 8.6, respectively, while the M1 membrane was positively charged in the whole pH range. The significant decrease in the surface acidity of the various membranes, compared CTA membranes [54,55], results from the addition of PEI in the membrane preparation and the resulting formation of positively charged quaternary ammonium groups [56,29]. It can be noticed that the addition of phosphorus-based additives (D2EHPA and TOPO) led to more basic surfaces (M1 and M4 membranes) compared with membranes containing TDDA and TOA (M2 and M3 membranes, respectively).…”

Section: M2 M3mentioning

confidence: 99%

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Recovery of rare earth elements from electronic waste by diffusion dialysis

Hammache

Bensaadi

Berbar

et al. 2021

Separation and Purification Technology

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Recycling rare earth elements (REEs) contained in electronic waste is of utmost importance due to their ever-increasing use in the high-tech sector. In this context, the use of non-polluting techniques represents a real challenge for scientists. In this work, we demonstrated that a clean and energy-efficient process, diffusion dialysis, has great potential for the recovery of neodymium (Nd) and praseodymium (Pr), contained in the Nd-Fe-B magnets of end-of-life computer hard disk drives (HDDs). Four kinds of polymer membranes were prepared by blending cellulose triacetate (CTA) and polyethylenimine (PEI) with the addition of di-(2ethylhexyl) phosphoric acid (D2EHPA), tridodecylamine (TDDA), trioctylamine (TOA) or trioctylphosphine oxide (TOPO). The membranes were first characterized by several techniques such as water uptake, contact angle, ATR-FTIR, SEM, XRD and zeta potential. They were further implemented in diffusion dialysis experiments in which diluted HDDs leachates were used as feed solutions. The relevance of the diffusion dialysis process for the recovery of REEs was demonstrated as it was possible to extract up to 15% of the boron by spontaneous diffusion through the CTA / PEI / TOA membrane in 6 hours with a lab-scale cell operating in batch mode. All membranes were positively charged under the operating conditions and then, REEs (present mainly in the form of trivalent cations Nd 3+ and Pr 3+) were strongly rejected. A fairly good correlation was found between the membrane water uptake and boron transfer, with boric acid molecules passing more easily through the more hydrated membranes. The selectivity factor between boron and REEs resulted from the interplay between the membrane structure, its water uptake ability and surface charge. It was also found to be dependent on the leachate composition. The CTA / PEI / TDDA membrane was found to exhibit the greatest B / REE selectivity factors, with values reaching up to 3706 and 140 for Nd and Pr, respectively. The lower selectivity towards Pr was explained by the weaker Gibbs energy of hydration of Pr 3+ cations compared with Nd 3+ .

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“…The results of the membrane electrokinetic characterization are displayed in Figure 7. The reported isoelectric points for CTA membranes are usually below pH 4 [54,55]. The M2, M3…”

Section: M2 M3mentioning

confidence: 99%

Section: M2 M3mentioning

confidence: 99%

Recovery of rare earth elements from electronic waste by diffusion dialysis

Hammache

Bensaadi

Berbar

et al. 2021

Separation and Purification Technology

View full text Add to dashboard Cite

show abstract

“…Most of the film-forming materials are polymers characterized by high stability and mechanical strength (e.g., polybenzimidazole, polyamide, polytriazole, cellulose acetate or cellulose triacetate) and biodegradable (poly/lactic acid, cellulose, bacterial cellulose or chitosan) [ 13 ]. They are mainly used as materials for membrane systems based on osmosis and diffusion [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…The energy dissipated is the product of absolute temperature ( T ) and S -entropy ( S ). The rate of entropy changes of the system (

) is the sum of the rate of entropy exchanged between the system and the environment (

) and the rate of entropy formation inside the system (

) [ 1 , 15 ]. The rate of formation or production of entropy inside the system is determined by the expression

, where

≥ 0—denotes the source of entropy that is the rate of S -entropy formation in the volume unit ( V ) of the tested system, (

> 0—in an irreversible process, and

= 0—in a reversible process) [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Global S-Entropy Production in Membrane Transport of Aqueous Solutions of Hydrochloric Acid and Ammonia

Batko

Ślęzak

2020

Entropy

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The results of experimental studies of volume osmotic fluxes (Jvkr) and fluxes of dissolved substances (Jkr) in a system containing a synthetic Nephrophan® membrane (Orwo VEB Filmfabrik, Wolfen, Germany) set in a horizontal plane are presented. The membrane separated water and aqueous HCl or ammonia solutions or aqueous ammonia and HCl solutions. It was found that for the homogeneity conditions of the solutions Jvk and Jk depend only on the concentration and composition of the solutions. For concentration polarization conditions (where concentration boundary layers are created on both sides), Jvkr and Jkr depend on both the concentration and composition of the solutions and the configuration of the membrane system. The obtained results of the Jvk and Jk flux studies were used to assess the global production of entropy for the conditions of homogeneity of solutions (ΦSk), while Jvkr and Jkr—to assess the global production of entropy for concentration polarization conditions (ΦSkr). In addition, the diffusion-convective effects and the convection effect in the global source of entropy were calculated. The concentration polarization coefficient ζir was related to modified concentration Rayleigh number, e.g., the parameter controlling the transition from non-convective (diffusive) to convective state. This number acts as a switch between two states of the concentration field: convective (with a higher entropy source value) and non-convective (with a lower entropy source value). The operation of this switch indicates the regulatory role of earthly gravity in relation to membrane transport.

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“…The active layers of NF membranes have been fabricated through interfacial polymerization using reactions between an amine-based monomer in an aqueous phase and an acyl chloride-based monomer in an organic solvent phase [18]. The reaction between m-phenylenediamine (MPD) and trimesoyl chloride (TMC), in particular, is a well-known method for fabricating polyamide (PA) active layers with high water flux and salt rejection [19]. Previous studies have reported further improvement of water flux or salt rejection using various post-treatments.…”

Section: Introductionmentioning

confidence: 99%

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

Jun

Yoon

Park

2019

Water

Self Cite

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This research focused on the influence of post-treatment using alkali-catalyzed hydrolysis with a full-aromatic nanofiltration (NF) polyamide membrane and its application to the efficient removal of selected dyes. The post-treated membranes were characterized through Fourier transform infrared spectroscopy, goniometry, and zeta-potential analysis to analyze the treatment-induced changes in the intrinsic properties of the membrane. Furthermore, the changes in permeability induced by the post-treatment were evaluated via the measurement of water flux, NaCl rejection, and molecular weight cutoff (MWCO) under different pH conditions and post-treatment times. Major changes induced by the post-treatment in terms of physicochemical properties were the enhancement of permeability, hydrophilicity, and negative charge due to the hydrolysis of the membrane’s amide bonds. Four different dyes were selected as representative organic pollutants considering the MWCO of the post-treated membranes. Compared with the pristine NF membrane, membranes post-treated at pH 13.5 showed better water flux with similar rejection of the target dyes. On the basis of these results, the proposed post-treatment method for NF membranes can be applied to the removal of organic pollutants of various size.

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The chlorination mechanism of integrally asymmetric cellulose triacetate (CTA)-based and thin film composite polyamide-based forward osmosis membrane

Cited by 34 publications

References 38 publications

Recovery of rare earth elements from electronic waste by diffusion dialysis

Recovery of rare earth elements from electronic waste by diffusion dialysis

Evaluation of the Global S-Entropy Production in Membrane Transport of Aqueous Solutions of Hydrochloric Acid and Ammonia

Post-Treatment of Nanofiltration Polyamide Membrane through Alkali-Catalyzed Hydrolysis to Treat Dyes in Model Wastewater

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