Purifying surface water contaminated with industrial failure using direct contact membrane distillation

Grossi, Luiza B.; Alvim, C. Bretas; Alvares, Cecília M.S.; Martins, Mateus F.; Amaral, Míriam Cristina Santos

doi:10.1016/j.seppur.2019.116052

Cited by 29 publications

(14 citation statements)

References 46 publications

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“…After 24 h of treating a dye solution, the CA of polydimethylsiloxane/PVDF-HFP hybrid electrospun membrane decreased from 155.4 to 87.1°, and increased to 154.9° after WF for 10 min . Nearly 100% of CA recovery could be achieved for PTFE membrane when the temperature increased from 25 to 60 °C during WF . Compared to DI water cleaning with a large volume (also with a long cleaning), it was more effective to employ a faster cleaning between filtration cycles using VMD with zeolite membrane for treating a NaCl solution with a concentration of 0.2–0.9 mol·L –1 .…”

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

“…Compared to DI water cleaning with a large volume (also with a long cleaning), it was more effective to employ a faster cleaning between filtration cycles using VMD with zeolite membrane for treating a NaCl solution with a concentration of 0.2–0.9 mol·L –1 . In addition, use of hot water in WF could improve the recovery of membrane hydrophobicity. , Pillai et al also confirmed that rinsing with pure water and blow-drying failed to restore the hydrophobicity of the polycarbonate membrane wetted by ethanol while heating at 363 K for 1 h was a successful cleaning approach …”

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

“…With respect to chemical cleaning, acid cleaning (e.g., hydrochloric acid and citric acid) and alkaline cleaning (e.g., NaOH) are commonly investigated, while EDTA, , hexane and electrochemical cleaning are widely used to eliminate wetting. While DI water rinsing was not able to reverse wetting of a modified PVDF membrane in the case of an oil-in-water emulsion containing SDS, rinsing with hexane was effective in reversing the membrane wetting .…”

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

See 2 more Smart Citations

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

133

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Hydrophobic membranes used in membrane distillation (MD) systems are often subject to wetting during long-term operation. Thus, it is of great importance to fully understand factors that influence the wettability of hydrophobic membranes and their impact on the overall separation efficiency that can be achieved in MD systems. This Critical Review summarizes both fundamental and applied aspects of membrane wetting with particular emphasis on interfacial interaction between the membrane and solutes in the feed solution. First, the theoretical background of surface wetting, including the relationship between wettability and interfacial interaction, definition and measurement of contact angle, surface tension, surface free energy, adhesion force, and liquid entry pressure, is described. Second, the nature of wettability, membrane wetting mechanisms, influence of membrane properties, feed characteristics and operating conditions on membrane wetting, and evolution of membrane wetting are reviewed in the context of an MD process. Third, specific membrane features that increase resistance to wetting (e.g., superhydrophobic, omniphobic, and Janus membranes) are discussed briefly followed by the comparison of various cleaning approaches to restore membrane hydrophobicity. Finally, challenges with the prevention of membrane wetting are summarized, and future work is proposed to improve the use of MD technology in a variety of applications.

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Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

Section: Restoring Membrane Hydrophobicitymentioning

confidence: 99%

See 1 more Smart Citation

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

133

View full text Add to dashboard Cite

show abstract

“…It should be noted that fouling occurring during membrane exploitation is a critical issue and has serious consequences for the process efficiency and performance. Hence, preventing a decline in permeate flux is a basic requirement for membrane process application on an industrial scale [ 11 , 12 ]. As has been indicated by Yao et al [ 4 ], key factors influencing fouling and wetting in the MD process are classified as: membrane surface properties, process parameters and feed characteristics.…”

Section: Introductionmentioning

confidence: 99%

Stability of Ar/O2 Plasma-Treated Polypropylene Membranes Applied for Membrane Distillation

Gryta

Tomczak

2021

Membranes

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In the present work, Ar/O2 plasma treatment was used as a surface modification tool for polypropylene (PP) membranes. The effect of the plasma conditions on the properties of the modified PP surface has been investigated. For this purpose, the influence of gas composition and its flow rate, plasma power excitation as well as treatment time on the contact angle of PP membranes has been investigated. The properties of used membranes were determined after various periods of time: immediately after the modification process as well as after one, four and five years of storage. Moreover, the used membranes were evaluated in terms of their performance in long-term MD process. Through detailed studies, we demonstrated that the performed plasma treatment process effectively enhanced the performance of the modified membranes. In addition, it was shown that the surface modification did not affect the degradation of the membrane matrix. Indeed, the used membranes maintained stable process properties throughout the studied period.

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“…The treatment methods of heavy metal pollution in water include chemical method, biological method, and physical-chemical process (Vareda et al 2019). Among them, physical-chemical methods include ionexchange (Kołodyńska et al 2008), solvent extraction (Silva et al 2005), membrane separation (Grossi et al 2020), and adsorption method (Huang et al 2019). Adsorption technology is widely used in the treatment of polluted water, and carbon materials (activated carbon (AC), carbon nanotubes (CNTs)) are often used in the selection of adsorbents Zhou et al 2019); this kind of material is convenient, practical, and economical (Velempini and Pillay 2019).…”

Section: Introductionmentioning

confidence: 99%

Carbon material–immobilized ionic liquids were applied on absorption of Hg2+ from water phase

Sun

Wang

et al. 2020

Environ Sci Pollut Res

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In this study, several immobilized ionic liquid adsorbents on carbon materials were synthesized with impregnation method. The carrier materials were activated carbon and three kinds of multi-walled carbon nanotubes. And the synthetic adsorbents immobilized different kinds of ionic liquids were characterized by Boehm titration, FT-IR, XPS, TG, and BET analysis, respectively. Finally, carbon materials after [C4mim]HSO 4 immobilization were selected as adsorbent to remove Hg 2+ from water phase. The optimum conditions of adsorption test of ionic liquid immobilized by multi-walled carbon nanotubes were as follows: the initial concentration of Hg 2+ was 400 mg/L, the adsorbent addition amount was 40 mg, the temperature was 20°C, the reaction time was 200 min, the removal rate of Hg 2+ peaked at 62.95%, the adsorption capacity was reached 79.00 mg/g. The optimum conditions of adsorption test of ionic liquid immobilized by activated carbon were as follows: the initial concentration of Hg 2+ was 300 mg/L, the adsorbent addition amount was 0.2 g, the temperature was 20°C, pH was 2.0, the reaction time was 100 min, the removal rate of Hg 2+ was more than 99%, the adsorption capacity was 118.65 mg/g. The adsorption isotherm fitting study found that the adsorption of adsorbent on Hg 2+ was more in line with the Langmuir model, and the adsorption kinetics study shows that the adsorption process is consistent with the pseudo-second-order kinetic equation. The results of kinetic analysis are further verified by thermodynamic analysis.

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Purifying surface water contaminated with industrial failure using direct contact membrane distillation

Cited by 29 publications

References 46 publications

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Stability of Ar/O2 Plasma-Treated Polypropylene Membranes Applied for Membrane Distillation

Carbon material–immobilized ionic liquids were applied on absorption of Hg2+ from water phase

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