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AuthorPark, Jiyeon
AuthorLim, Jonghun
AuthorPark, Yiseul
AuthorHan, Dong Suk
AuthorShon, Ho Kyong
AuthorHoffmann, Michael R.
AuthorPark, Hyunwoong
Available date2022-12-19T10:18:23Z
Publication Date2020-06-16
Publication NameEnvironmental Science and Technology
Identifierhttp://dx.doi.org/10.1021/acs.est.0c01550
CitationPark, J., Lim, J., Park, Y., Han, D. S., Shon, H. K., Hoffmann, M. R., & Park, H. (2020). In situ-generated reactive oxygen species in precharged titania and tungsten trioxide composite catalyst membrane filters: Application to as (III) oxidation in the absence of irradiation. Environmental science & technology, 54(15), 9601-9608.
ISSN0013-936X
URIhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088981224&origin=inward
URIhttp://hdl.handle.net/10576/37393
AbstractThis study demonstrates that in situ-generated reactive oxygen species (ROSs) in prephotocharged TiO2 and WO3 (TW) composite particle-embedded inorganic membrane filters oxidize arsenite (As(III)) into arsenate (As(V)) without any auxiliary chemical oxidants under ambient conditions in the dark. TW membrane filters have been charged with UV or simulated sunlight and subsequently transferred to a once-through flow-type system. The charged TW filters can transfer the stored electrons to dissolved O2, producing ROSs that mediate As(III) oxidation in the dark. Dramatic inhibition of As(V) production with O2 removal or addition of ROS quenchers indicates an ROS-mediated As(III) oxidation mechanism. Electron paramagnetic spectroscopic analysis has confirmed the formation of the HO2â¢/O2â¢- pair in the dark. The WO3 fraction in the TW filter significantly influences the performance of the As(III) oxidation, while As(V) production is enhanced with increasing charging time and solution pH. The As(III) oxidation is terminated when the singly charged TW filter is fully discharged; however, recharging of TW recovers the catalytic activity for As(III) oxidation. The proposed oxidation process using charged TW membrane filters is practical and environmentally benign for the continuous treatment of As(III)-contaminated water during periods of unavailability of sunlight.
Sponsor- Qatar National Research Fund (QNRF) - grant #NPRP 10-1210-160019. - National Research Foundation of Korea (NRF) - grant #2018R1A6A1A03024962, 2019M1A2A2065616, 2019R1A2C2002602.
Languageen
PublisherAmerican Chemical Society (ACS)
SubjectSpectroscopic analysis
Oxidize arsenite
Contaminated water
TitleIn Situ-Generated Reactive Oxygen Species in Precharged Titania and Tungsten Trioxide Composite Catalyst Membrane Filters: Application to As(III) Oxidation in the Absence of Irradiation
TypeArticle
Pagination9601-9608
Issue Number15
Volume Number54
ESSN1520-5851
dc.accessType Abstract Only


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