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Effects of decreasing activated carbon particle diameter from 30 mu m to 140 nm on equilibrium adsorption capacity

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Title: Effects of decreasing activated carbon particle diameter from 30 mu m to 140 nm on equilibrium adsorption capacity
Authors: Pan, Long Browse this author
Nishimura, Yuki Browse this author
Takaesu, Hideki Browse this author
Matsui, Yoshihiko Browse this author →KAKEN DB
Matsushita, Taku Browse this author →KAKEN DB
Shirasaki, Nobutaka Browse this author
Keywords: MIB
Micro-grinding
Bead mill
Oxygen content
Oxidation
Issue Date: 1-Nov-2017
Publisher: Elsevier
Journal Title: Water research
Volume: 124
Start Page: 425
End Page: 434
Publisher DOI: 10.1016/j.watres.2017.07.075
Abstract: The capacity of activated carbon particles with median diameters (D50s) of >similar to 1 mu m for adsorption of hydrophobic micropollutants such as 2-methylisolborneol (MIB) increases with decreasing particle size because the pollutants are adsorbed mostly on the exterior (shell) of the particles owing to the limited diffusion penetration depth. However, particles with D50s of <1 mu m have not been thoroughly investigated. Here, we prepared particles with D50s of similar to 30 mu m-similar to 140 nm and evaluated their adsorption capacities for MIB and several other environmentally relevant adsorbates. The adsorption capacities for low-molecular-weight adsorbates, including MIB, deceased with decreasing particle size for D50s of less than a few micrometers, whereas adsorption capacities increased with decreasing particle size for larger particles. The oxygen content of the particles increased substantially with decreasing particle size for D50s of less than a few micrometers, and oxygen content was negatively correlated with adsorption capacity. The decrease in adsorption capacity with decreasing particle size for the smaller particles was due to particle oxidation during the micromilling procedure used to decrease D50 to similar to 140 nm. When oxidation was partially inhibited, the MIB adsorption capacity decrease was attenuated. For high molecular-weight adsorbates, adsorption capacity increased with decreasing particle size over the entire range of tested particle sizes, even though particle oxygen content increased with decreasing particle size.
Rights: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/75989
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松井 佳彦

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