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)

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