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Citation
Tags
HERO ID
193436
Reference Type
Journal Article
Title
Selecting metal oxide nanomaterials for arsenic removal in fixed bed columns: From nanopowders to aggregated nanoparticle media
Author(s)
Hristovski, K; Baumgardner, A; Westerhoff, P
Year
2007
Is Peer Reviewed?
Yes
Journal
Journal of Hazardous Materials
ISSN:
0304-3894
EISSN:
1873-3336
Volume
147
Issue
1-2
Page Numbers
265-274
Language
English
PMID
17254707
DOI
10.1016/j.jhazmat.2007.01.017
Web of Science Id
WOS:000249136200034
URL
http://www.sciencedirect.com/science/article/B6TGF-4MSHY3F-1/2/32e33288255e28bc90232dc38b91106c
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Abstract
This paper investigates the feasibility of arsenate removal by aggregated metal oxide nanoparticle media in packed bed columns. Batch experiments conducted with 16 commercial nanopowders in four water matrices were used to select a metal oxide nanoparticle that both amply removes arsenate and can be aggregated using an inert binder. TiO2, Fe2O3, ZrO2 and NiO nanopowders, which exhibited the highest arsenate removal in all water matrices, were characterized with fitted Freundlich adsorption isotherm () parameters. In 10 mM NaHCO3 buffered nanopure water and at both pH [approximate] 6.7 and 8.4, K ranged from 1.3 to 12.09 (mg As/g(media)) (L/mg As)1/n, and 1/n ranged from 0.21 to 0.52. Under these conditions, the fitted Freundlich isotherm parameters for TiO2 nanoparticles aggregated with inorganic and organic binders (K of 4.75-28.45 (mg As/g(media)) (L/mg As)1/n and 1/n of 0.37-0.97) suggested favorable arsenate adsorption. To demonstrate that aggregated nanoparticle media would allow rapid mass transport of arsenate in a fixed bed adsorber setting, short bed adsorber (SBA) tests were conducted on TiO2 nanoparticle aggregates at empty bed contact times (EBCT) of 0.1-0.5 min and Re × Sc = 1000 and 2000. These SBA tests suggested that the binder has a negligible role in adsorbing arsenic and that mass transport is controlled by rapid intraparticle diffusion rather than external film diffusion.
Tags
IRIS
•
Arsenic Hazard ID
1. Initial Lit Search
PubMed
ToxNet
4. Considered through Oct 2015
6. Cluster Filter through Oct 2015
•
Arsenic (Inorganic)
1. Literature
PubMed
Toxline, TSCATS, & DART
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