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Easily Recoverable, Micrometer-Sized TiO 2 Hierarchical Spheres Decorated with Cyclodextrin for Enhanced Photocatalytic Degradation of Organic Micropollutants
  • Zhang, Danning ;
  • Lee, Changgu ;
  • Javed, Hassan ;
  • Yu, Pingfeng ;
  • Kim, Jae Hong ;
  • Alvarez, Pedro J.J.
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Publication Year
2018-11-06
Journal
Environmental Science and Technology
Publisher
American Chemical Society
Citation
Environmental Science and Technology, Vol.52 No.21, pp.12402-12411
Mesh Keyword
Continuous flow reactorsLarge specific surface areasOrganic micro-pollutantsPhoto catalytic degradationPhotocatalytic water treatmentReactive oxygen speciesRecalcitrant organic pollutantsWater and wastewater treatmentsCatalysisCyclodextrinsHydrophobic and Hydrophilic InteractionsLightTitaniumWaste WaterWater Pollutants, Chemical
All Science Classification Codes (ASJC)
Chemistry (all)Environmental Chemistry
Abstract
Micrometer-sized titanium dioxide hierarchical spheres (TiO 2 -HS) were assembled from nanosheets to address two common limitations of photocatalytic water treatment: (1) inefficiency associated with scavenging of oxidation capacity by nontarget water constituents and (2) energy-intensive separation and recovery of the photocatalyst slurry. These micrometer-sized spheres are amenable to low-energy separation, and over 99% were recaptured from both batch and continuous flow reactors using microfiltration. Using nanosheets as building blocks resulted in a large specific surface area - 3 times larger than that of commercially available TiO 2 powder (Evonik P25). Anchoring food-grade cyclodextrin onto TiO 2 -HS (i.e., CD-TiO 2 -HS) provided hydrophobic cavities to entrap organic contaminants for more effective utilization of photocatalytically generated reactive oxygen species. CD-TiO 2 -HS removed over 99% of various contaminants with dissimilar hydrophobicity (i.e., bisphenol A, bisphenol S, 2-naphthol, and 2,4-dichlorophenol) within 2 h under a low-intensity UVA input (3.64 × 10 -6 einstein/L/s). As with other catalyst (including TiO 2 slurry), periodic replacement or replenishment would be needed to maintain high treatment efficiency (e.g., we demonstrate full reactivation through simple reanchoring of CD). Nevertheless, this task would be offset by significant savings in photocatalyst separation. Thus, CD-TiO 2 -HS is an attractive candidate for photocatalytic water and wastewater treatment of recalcitrant organic pollutants.
ISSN
1520-5851
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/30417
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055181097&origin=inward
DOI
https://doi.org/2-s2.0-85055181097
Journal URL
http://pubs.acs.org/journal/esthag
Type
Article
Funding
This research is supported by the NSF ERC on Nanotechnology-Enabled Water Treatment (EEC-1449500).
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Lee, Chang-Gu  Image
Lee, Chang-Gu 이창구
Department of Environmental and Safety Engineering
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