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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

Park, Jiyeon and Lim, Jonghun and Park, Yiseul and Han, Dong Suk and Shon, Ho Kyong and Hoffmann, Michael R. and Park, Hyunwoong (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 and Technology, 54 (15). pp. 9601-9608. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20200622-104137391

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Abstract

This 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 HO₂•/O₂•– 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acs.est.0c01550DOIArticle
ORCID:
AuthorORCID
Park, Jiyeon0000-0002-6964-3288
Lim, Jonghun0000-0002-2943-1846
Park, Yiseul0000-0003-3256-1032
Han, Dong Suk0000-0002-4804-5369
Shon, Ho Kyong0000-0002-3777-7169
Hoffmann, Michael R.0000-0001-6495-1946
Park, Hyunwoong0000-0002-4938-6907
Alternate Title:In-situ-generated reactive oxygen species in pre-charged titania and tungsten trioxide composite catalyst membrane filters: Application to As(III) oxidation in the absence of irradiation
Additional Information:© 2020 American Chemical Society. Received: March 12, 2020; Revised: June 3, 2020; Accepted: June 16, 2020; Published: June 16, 2020. This research was partly supported by the National Research Foundation of Korea (2019R1A2C2002602, 2018R1A6A1A03024962, and 2019M1A2A2065616). We are grateful to the Global Research Laboratory (GRL) Program (2014K1A1A2041044) through the National Research Foundation, Korea. This publication was made possible by a grant from the Qatar National Research Fund under its National Priorities Research Program (NPRP 10-1210-160019). Author Contributions: J.P. and J.L. contributed equally to this work. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2019R1A2C2002602
National Research Foundation of Korea2018R1A6A1A03024962
National Research Foundation of Korea2019M1A2A2065616
National Research Foundation of Korea2014K1A1A2041044
Qatar National Research FundNPRP 10-1210-160019
Subject Keywords:Solar charging; Reactive oxygen species; Composites; Membrane filters; Charge storage
Issue or Number:15
Record Number:CaltechAUTHORS:20200622-104137391
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200622-104137391
Official Citation: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. Jiyeon Park, Jonghun Lim, Yiseul Park, Dong Suk Han, Ho Kyong Shon, Michael R. Hoffmann, and Hyunwoong Park. Environmental Science & Technology 2020 54 (15), 9601-9608; DOI: 10.1021/acs.est.0c01550
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103953
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Jun 2020 14:16
Last Modified:26 Aug 2020 20:44

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