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Filtration

About: Filtration is a research topic. Over the lifetime, 39544 publications have been published within this topic receiving 334442 citations.


Papers
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Journal ArticleDOI
14 Feb 2014-Science
TL;DR: This work investigates permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions, which reveal that the GO membrane can attract a high concentration of small ions into the membrane, which may explain the fast ion transport.
Abstract: Graphene-based materials can have well-defined nanometer pores and can exhibit low frictional water flow inside them, making their properties of interest for filtration and separation. We investigate permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions. The laminates are vacuum-tight in the dry state but, if immersed in water, act as molecular sieves, blocking all solutes with hydrated radii larger than 4.5 angstroms. Smaller ions permeate through the membranes at rates thousands of times faster than what is expected for simple diffusion. We believe that this behavior is caused by a network of nanocapillaries that open up in the hydrated state and accept only species that fit in. The anomalously fast permeation is attributed to a capillary-like high pressure acting on ions inside graphene capillaries.

2,055 citations

Journal ArticleDOI
TL;DR: In this article, a conceptual model for water and waste water filtration processes is presented and compared with the results of laboratory experiments, and applications of particle destabilization and particle transport are presented.
Abstract: H A conceptual model for water and waste water filtration processes is presented and compared with the results of laboratory experiments. Efficient filtration involves both particle destabilization and particle transport. Destabilization in filtration is similar to destabilization in coagulation; effective coagulants are observed to be effective “filter aids.” Particle transport in filtration is analogous to transport in flocculation processes. A particle size with a minimum contact opportunity exists ; smaller particles are transported by diffusion while larger particles are transported by interception and settling. Applications of these concepts to water and waste water filtration are presented.

1,551 citations

Journal ArticleDOI
TL;DR: The concept of critical flux is introduced in this article to identify the critical flux and the desirability of starting filtration operations at a low flux, where a flux below which a decline of flux with time does not occur.

1,336 citations

Journal ArticleDOI
Wenbin Zhang1, Zhun Shi1, Feng Zhang1, Xia Liu1, Jian Jin1, Lei Jiang1 
TL;DR: A superhydrophobic-superoleophilic PVDF membrane is fabricated via an inert solvent-induced phase inversion for effective separation of both micrometer and nanometer-sized surfactant-free and surfactants-stabilized water-in-oil emulsions solely driven by gravity.
Abstract: A superhydrophobic-superoleophilic PVDF membrane is fabricated via an inert solvent-induced phase inversion for effective separation of both micrometer and nanometer-sized surfactant-free and surfactant-stabilized water-in-oil emulsions solely driven by gravity, with high separation efficiency (oil purity in filtrate after separation > 99.95 wt%) and high flux, which is several times higher than those of commercial filtration membranes and reported materials with similar permeation properties.

983 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202244
20211,021
20201,407
20191,956
20182,287
20172,340