An ultrathin, porous and in-air hydrophilic/underwater oleophobic coating simultaneously increasing the flux and antifouling property of membrane for membrane distillation

Sun, Wei-Shi; Shen, Fanxia; Wang, Zhaoshuai; Zhang, Yan; Wan, Yinhua

doi:10.1016/j.desal.2018.07.026

Cited by 61 publications

(23 citation statements)

References 43 publications

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“…Membrane modifications break down barriers in terms of the MD process' operational limitations and explore new possibilities for recovering water from industrial effluents [131]. Water recovery from oily solutions [133], which would cause severe fouling in traditional membranes, becomes possible with modified membranes, such as those con- Coating is the most-researched modification technique for MD membranes, owing to its simple methodology and lack of complex equipment [135,136]. The dip-coating technique, for example, necessitates no additional equipment beyond standard laboratory equipment.…”

Section: Affects Typical Values (Commercial Membranes) Recommendationmentioning

confidence: 99%

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

2021

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This review investigates antifouling agents used in the process of membrane separation (MS), in reverse osmosis (RO), ultrafiltration (UF), nanofiltration (NF), microfiltration (MF), membrane distillation (MD), and membrane bioreactors (MBR), and clarifies the fouling mechanism. Membrane fouling is an incomplete substance formed on the membrane surface, which will quickly reduce the permeation flux and damage the membrane. Foulant is colloidal matter: organic matter (humic acid, protein, carbohydrate, nano/microplastics), inorganic matter (clay such as potassium montmorillonite, silica salt, metal oxide, etc.), and biological matter (viruses, bacteria and microorganisms adhering to the surface of the membrane in the case of nutrients) The stability and performance of the tested nanometric membranes, as well as the mitigation of pollution assisted by electricity and the cleaning and repair of membranes, are reported. Physical, chemical, physico-chemical, and biological methods for cleaning membranes. Biologically induced biofilm dispersion effectively controls fouling. Dynamic changes in membrane foulants during long-term operation are critical to the development and implementation of fouling control methods. Membrane fouling control strategies show that improving membrane performance is not only the end goal, but new ideas and new technologies for membrane cleaning and repair need to be explored and developed in order to develop future applications.

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Section: Affects Typical Values (Commercial Membranes) Recommendationmentioning

confidence: 99%

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

2021

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“…The highest permeate flux was obtained through the dip‐coating method, [ 29 ] where a hydrophilic character was generated on a PVDF surface. The reported studies concluded that dual‐layer membranes are adequate for the obtention of high permeate flux values and oleophobic characteristics.…”

Section: Surface Modificationmentioning

confidence: 99%

“…According to Figure , almost half of the reported studies showed the influence of hydrophobicity improvement on the antiwetting behavior in long‐term operational performance. [ 29–30,31,34,40,41 ] Most of these studies (77.8%) were conducted in long‐term operation using a conventional desalination process, where the NaCl concentration varied between 10 and 35 g L −1 . The results in long‐term operations can differ among the MD process solutions due to the differences in surface tensions and chemical composition among the tested solutions.…”

Section: Electrospinningmentioning

confidence: 99%

“…It was 210% higher than the pristine membrane. [ 29 ] The cross‐linker polydopamine (PDA) forms amine groups on the membrane surface, changing its water behavior to oleophobic underwater and in antifouling structures. [ 29,55 ] The PDA bonding does not seem to compromise the high LEP of hydrophobic membranes.…”

Section: Coatingmentioning

confidence: 99%

“…[ 29 ] The cross‐linker polydopamine (PDA) forms amine groups on the membrane surface, changing its water behavior to oleophobic underwater and in antifouling structures. [ 29,55 ] The PDA bonding does not seem to compromise the high LEP of hydrophobic membranes. Similarly, GA was used via a dip‐coating technique to create OH terminations on the membrane surface, changing the membrane wetting behavior.…”

Section: Coatingmentioning

confidence: 99%

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Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

et al. 2021

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Membrane distillation (MD) is a thermally driven separation process where a hydrophobic and microporous membrane separates nonvolatile compounds. Because of its advantages, this process appears as an efficient way to recover water from industrial effluents. However, the commercial membranes used in the MD process still have operational troubles with complex industrial wastewater and against harsh operational conditions. Fouling, wetting, and low time of operation compromise the membrane function and make the total consolidation of MD technology difficult beyond the traditional application (desalination). Membrane modification can be key to mitigating these operational problems, allowing MD's expansion to complex separations. In this context, herein the main technologies to modify the membranes for MD applications of the last five years are comprehensively summarized. Three kinds of postfabrication modifications are focused on: electrospinning, coating, and plasma, including polymeric and ceramic membranes. A critical analysis of each technique is developed, discussing their potentialities and the properties achieved through them. This review enables the understanding of the operational problems of MD technology and leads to finding feasible alternatives to their mitigation. It also clarifies the evolution in membrane modification, discusses the development directions, and points out the future challenges of modifications.

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Fouling limitations of osmotic pressure‐driven processes and its remedial strategies: A review

Singh

Maiti

Pandey

et al. 2022

J of Applied Polymer Sci

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The scarcity of freshwater is one of the major challenges to the civilized community around the World. So, the various engineered processes have been developed for the remediation of this problem such as osmotic pressure-driven processes (OPDPs). OPDPs includes forward osmosis and pressure retarded osmosis, which have gained enormous attention and becoming a flexible membrane-based technology for desalination and wastewater treatment. The most significant components of the OPDPs to be efficient are the membranes and the draw solution. Although numerous studies highlighted the membrane fouling and concentration polarization are one of the critical parameters to assess the system efficiency in the OPDPs and other pressure driven membrane processes. This study delivers an up-to-date review of the OPDPs in terms of concentration polarization, membrane fouling (organic, inorganic, and biofouling), foulant interactions, remedial strategies, monitoring and characterization techniques, and future directions of research. Numerous foulant interactions are also elaborated for the OPDPs in the field of the membrane separation technique. State of the art in antifouling membrane fabrication methods are critically reviewed along with different remedial strategies for fouled membranes in OPDPs.

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An ultrathin, porous and in-air hydrophilic/underwater oleophobic coating simultaneously increasing the flux and antifouling property of membrane for membrane distillation

Cited by 61 publications

References 43 publications

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

Review of New Approaches for Fouling Mitigation in Membrane Separation Processes in Water Treatment Applications

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

Fouling limitations of osmotic pressure‐driven processes and its remedial strategies: A review

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