Bauer, R.A.; Qiu, M.; Schillo-Armstrong, M.C.; Snider, M.T.; Yang, Z.; Zhou, Y.; Verweij, H. Ultra-Stable Inorganic Mesoporous Membranes for Water Purification. Membranes2024, 14, 34.
Bauer, R.A.; Qiu, M.; Schillo-Armstrong, M.C.; Snider, M.T.; Yang, Z.; Zhou, Y.; Verweij, H. Ultra-Stable Inorganic Mesoporous Membranes for Water Purification. Membranes 2024, 14, 34.
Bauer, R.A.; Qiu, M.; Schillo-Armstrong, M.C.; Snider, M.T.; Yang, Z.; Zhou, Y.; Verweij, H. Ultra-Stable Inorganic Mesoporous Membranes for Water Purification. Membranes2024, 14, 34.
Bauer, R.A.; Qiu, M.; Schillo-Armstrong, M.C.; Snider, M.T.; Yang, Z.; Zhou, Y.; Verweij, H. Ultra-Stable Inorganic Mesoporous Membranes for Water Purification. Membranes 2024, 14, 34.
Abstract
Thin supported inorganic mesoporous membranes are used for removal of salts, small molecules (PFAS, dyes, polyanions) and particulate species (oil droplets) from aqueous sources with high flux and selectivity. Nano-filtration membranes can reject simple salts with 80-100% selectivity through a space charge mechanism. Rejection by size selectivity can be near 100% since the membranes can have a very narrow size distribution. Mesoporous membranes have received par-ticular interest due to their (potential) stability at operational conditions and defouling operations. More recently membranes with extreme stability became interesting with the advent of in-situ fouling mitigation by means of ultrasound, emitted from within the membrane structure. For this reason we explored the stability of available and new membranes with accelerated lifetime tests in aqueous solutions at various temperatures and pH values. Of the available ceria, titania, mag-netite membranes none were actually stable at all test conditions. In earlier work, it was already established that meso-porous alumina membranes have very poor stability. A new nano-filtration membrane was made of cubic zirconia membranes that exhibited a near perfect stability. A new ultra-filtration membrane was made of amorphous silica that was fully stable in ultrapure water at 80°C. This work provides details of membrane synthesis, stability characterization and actual sta-bility data.
Keywords
inorganic membranes; nanofiltration; ultrafiltration; water purification
Subject
Engineering, Chemical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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