Abstract
In populated, water-scarce regions, seawater and wastewater are considered as potable water resources that require extensive treatment before being suitable for consumption. The separation of water from salt, organic, and inorganic matter is most commonly done through membrane separation processes. Because of permeate flux and concentration polarization, membranes are prone to fouling, resulting in a decline in membrane performance and increased energy demands. As the physical and chemical properties of commercially available membranes (polymeric and ceramic) are relatively static and insensitive to changes in the environment, there is a need for stimuli-reactive membranes with controlled, tunable surface and transport properties to decrease fouling and control membrane properties such as hydrophilicity and permselectivity. In this review, we first describe the application of electricity-conducting and electricity-responsive membranes (ERMs) for fouling mitigation. We discuss their ability to reduce organic, inorganic, and biological fouling by several mechanisms, including control over the membrane’s surface morphology, electrostatic rejection, piezoelectric vibrations, electrochemical reactions, and local pH changes. Next, we examine the use of ERMs for permselectivity modification, which allows for the optimization of rejection and control over ion transport through the application of electrical potentials and the use of electrostatically charged membrane surfaces. In addition, electrochemical reactions coupled with membrane filtration are examined, including electro-oxidation and electro-Fenton reactions, demonstrating the capability of ERMs to electro-oxidize organic contaminates with high efficiency due to high surface area and reduced mass diffusion limitations. When applicable, ERM applications are compared with commercial membranes in terms of energy consumptions. We conclude with a brief discussion regarding the future directions of ERMs and provide examples of several applications such as pore size and selectivity control, electrowettability, and capacitive deionization. To provide the reader with the current state of knowledge, the review focuses on research published in the last 5 years.
Award Identifier / Grant number: FI-497-2014
Funding statement: This research was supported by BARD, the United States-Israel Binational Agricultural Research and Development Fund, Vaadia-BARD Postdoctoral Fellowship Award No. FI-497-2014.
Acknowledgments
This research was supported by BARD, the United States-Israel Binational Agricultural Research and Development Fund, Vaadia-BARD Postdoctoral Fellowship Award No. FI-497-2014.
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Articles in the same Issue
- Frontmatter
- In this issue
- A critical analysis on palm kernel shell from oil palm industry as a feedstock for solid char production
- Survey of supercritical fluid techniques for producing drug delivery systems for a potential use in cancer therapy
- Electroconductive and electroresponsive membranes for water treatment
- Marangoni effect in nonequilibrium multiphase system of material processing
Articles in the same Issue
- Frontmatter
- In this issue
- A critical analysis on palm kernel shell from oil palm industry as a feedstock for solid char production
- Survey of supercritical fluid techniques for producing drug delivery systems for a potential use in cancer therapy
- Electroconductive and electroresponsive membranes for water treatment
- Marangoni effect in nonequilibrium multiphase system of material processing