Hydroxyl radical formation during ozonation of multiwalled carbon nanotubes: performance optimization and demonstration of a reactive CNT filter

Environmental Science & Technology
Rebekah OultonDavid M Cwiertny

Abstract

We explored factors influencing hydroxyl radical (•OH) formation during ozonation of multiwalled carbon nanotubes (MWCNTs) and assessed this system's viability as a next-generation advanced oxidation process (AOP). Using standard reactivity metrics for ozone-based AOPs (RCT values), MWCNTs promoted •OH formation during ozonation to levels exceeding ozone (both alone and with activated carbon) and equivalent to ozone with hydrogen peroxide. MWCNTs oxidized with nitric acid exhibited vastly greater rates of ozone consumption and •OH formation relative to as-received MWCNTs. While some of this enhancement reflects their greater suspension stability, a strong correlation between RCT values and surface oxygen concentrations from X-ray photoelectron spectroscopy suggests that surface sites generated during MWCNT oxidation promote •OH exposure. Removal of several ozone-recalcitrant species [para-chlorobenzoic acid (p-CBA), atrazine, DEET, and ibuprofen] was not significantly inhibited in the presence of radical scavengers (humic acid, carbonate), in complex aquatic matrices (Iowa River water) and after 12 h of continuous exposure of MWCNTs to concentrated ozone solutions. As a proof-of-concept, oxidized MWCNTs deposited on a ceramic m...Continue Reading

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Apr 27, 2016·Water Research·Pedro M ÁlvarezFernando J Beltrán
Jun 4, 2016·Journal of Hazardous Materials·Ana M ChávezPedro M Álvarez
Aug 1, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Enling HuAnd Ka-Lok Chiu
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Jul 17, 2021·ACS Applied Materials & Interfaces·Hye-Jin LeeCharles-François de Lannoy
Mar 13, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Benjamin J MaplebackAndrew N Rider

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