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- In relation to this article, we declare that there is no conflict of interest.
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Received August 14, 2023
Accepted November 21, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Enhancing Removal of Acid Orange II by Heterogeneous Catalytic Ozonation Using ZnO Nanoparticles-Modified Fly Ash Composite
Abstract
In this study, heterogeneous catalytic ozonation using fl y ash (FA) modifi ed ZnO nanoparticles to the decolorization of acid
orange II (AOII) was studied. The combination of ZnO and fl y ash via an incipient wetness impregnation method to form
ZOFA composites created a synergistic eff ect that led to effi cient catalytic ozonation activity towards AOII degradation
and decolorization compared with individual ozonation processes. From the experimental results, ZOFA composite with
the optimal weight ratio between ZnO NPs and FA was 20 wt% (denoted as ZOFA-20) that exhibited outstanding catalytic
ozonation activity. Moreover, through other investigations including initial pH conditions and catalyst dosage, AOII could
be eff ectively and optimally eliminated by 0.5 g of ZOFA-20 with an initial pH value of 11. The corresponding k value was
measured as 0.248 min −1 with a maximum TOC removal content of 77.27%. Besides, ZOFA-20 could show high catalytic
ozonation activity even at highly concentrated AOII concentrations while it could also retain its excellent stability and reusability
over 5 continuous AOII removal cycles. From the experimental and electron paramagnetic resonance (EPR) results,
hydroxyl radical ( · OH) was the main active species during the catalytic ozonation of AOII. The present study provides a
promising approach to prepare novel composite-based fl y ash that would be applicable for removing azo dye and other dye
pollutants in water via a catalytic ozonation strategy.
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