Investigating crystal plane effect of Co3O4 with various morphologies on catalytic activation of monopersulfate for degradation of phenol in water

Liu, W.-J., Wang, H., Lee, J., Kwon, E., Xuan Thanh, B., You, S. , Park, Y.-K., Tong, S. and Andrew Lin, K.-Y. (2021) Investigating crystal plane effect of Co3O4 with various morphologies on catalytic activation of monopersulfate for degradation of phenol in water. Separation and Purification Technology, 276, 119368. (doi: 10.1016/j.seppur.2021.119368)

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Abstract

As phenol represents as the most typical persistent organic pollutants in wastewater, SO4•−-involved chemical oxidation techniques using monopersulfate (MPS) have been regarded as a promising method to eliminate phenol. Since Co3O4 is the benchmark heterogeneous catalyst for activating MPS, it is highly critical to investigate shape-varied Co3O4 catalysts with well-defined crystal planes for activating MPS to degrade phenol. Thus, the aim of this study is to elucidate how different Co3O4 catalysts with various well-defined planes would influence catalytic activities for MPS activation. Specifically, three Co3O4 nanocrystals are fabricated: nanoplate (NP), nanobundle (NB), and nanocube (NC) with different dominant exposed facets of {112}, {110}, and {100}, respectively. As the facets of {112} and {110} consist of more abundant Co2+/Co3+, Co3O4-NP and Co3O4-NB exhibit noticeably higher catalytic activities then Co3O4-NC for activating MPS to degrade phenol. Nevertheless, since Co3O4-NP shows a much higher surface area than Co3O4-NB, Co3O4-NP could exhibit a relatively high catalytic activity in comparison to Co3O4-NB. In addition, Co3O4-NP also exhibits much faster degradation kinetics with a rate constant of 0.061 min-1 at 30°C, and more resistance towards pH variation, with much stable reaction stoichiometric efficiencies (RSE) ranging from 0.034 to 0.039 at pH = 3∼9, than the other two Co3O4 nanocrystals, making Co3O4-NP with the {112} facet a more outstanding Co3O4 for activating MPS to degrade phenol.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:You, Dr Siming
Creator Roles:
You, S.Data curation, Visualization
Authors: Liu, W.-J., Wang, H., Lee, J., Kwon, E., Xuan Thanh, B., You, S., Park, Y.-K., Tong, S., and Andrew Lin, K.-Y.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Separation and Purification Technology
Publisher:Elsevier
ISSN:1383-5866
ISSN (Online):1873-3794
Published Online:29 July 2021
Copyright Holders:Copyright © 2021 Elsevier
First Published:First published in Separation and Purification Technology 276: 119368
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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