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Citation
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HERO ID
1936037
Reference Type
Journal Article
Title
Exceptional arsenic (III,V) removal performance of highly porous, nanostructured ZrO2 spheres for fixed bed reactors and the full-scale system modeling
Author(s)
Cui, H; Su, Y; Li, Q; Gao, S; Shang, JK
Year
2013
Is Peer Reviewed?
1
Journal
Water Research
ISSN:
0043-1354
EISSN:
1879-2448
Publisher
Elsevier
Volume
47
Issue
16
Page Numbers
6258-6268
Language
English
PMID
23978657
DOI
10.1016/j.watres.2013.07.040
Web of Science Id
WOS:000326910000028
URL
https://linkinghub.elsevier.com/retrieve/pii/S0043135413006155
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Abstract
Highly porous, nanostructured zirconium oxide spheres were fabricated from ZrO2 nanoparticles with the assistance of agar powder to form spheres with size at millimeter level followed with a heat treatment at 450 °C to remove agar network, which provided a simple, low-cost, and safe process for the synthesis of ZrO2 spheres. These ZrO2 spheres had a dual-pore structure, in which interconnected macropores were beneficial for liquid transport and the mesopores could largely increase their surface area (about 98 m2/g) for effective contact with arsenic species in water. These ZrO2 spheres demonstrated an even better arsenic removal performance on both As(III) and As(V) than ZrO2 nanoparticles, and could be readily applied to commonly used fixed-bed adsorption reactors in the industry. A short bed adsorbent test was conducted to validate the calculated external mass transport coefficient and the pore diffusion coefficient. The performance of full-scale fixed bed systems with these ZrO2 spheres as the adsorber was estimated by the validated pore surface diffusion modeling. With the empty bed contact time (EBCT) at 10 min and the initial arsenic concentration at 30 ppb, the number of bed volumes that could be treated by these dry ZrO2 spheres reached ∼255,000 BVs and ∼271,000 BVs for As(III) and As(V), respectively, until the maximum contaminant level of 10 ppb was reached. These ZrO2 spheres are non-toxic, highly stable, and resistant to acid and alkali, have a high arsenic adsorption capacity, and could be easily adapted for various arsenic removal apparatus. Thus, these ZrO2 spheres may have a promising potential for their application in water treatment practice.
Keywords
Nanostructured ZrO2 spheres; As(III) and As(V) removal; Adsorption; Short bed adsorber (SBA) test; Pore surface diffusion model (PSDM)
Tags
IRIS
•
Arsenic Hazard ID
PubMed
Considered New
PubMed
Considered New
2. Lit Search Updates through Oct 2015
PubMed
Considered
7. Other Studies through Oct 2015
Other
•
Arsenic (Inorganic)
1. Literature
Lit search updates through Oct 2015
3. Hazard ID Screening
Other potentially supporting studies
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