Investigating crystal plane effect of Co3O4 with various morphologies on catalytic activation of monopersulfate for degradation of phenol in wateropen access
- Authors
- Liu, Wei-Jie; Wang, Haitao; Lee, Jechan; Kwon, Eilhann; Thanh, Bui Xuan; You, Siming; Park, Young-Kwon; Tong, Shaoping; Lin, Kun-Yi Andrew
- Issue Date
- Dec-2021
- Publisher
- ELSEVIER
- Keywords
- Co3O4; Monopersulfate; Phenol; Crystal plane; Oxidation
- Citation
- SEPARATION AND PURIFICATION TECHNOLOGY, v.276
- Indexed
- SCIE
SCOPUS
- Journal Title
- SEPARATION AND PURIFICATION TECHNOLOGY
- Volume
- 276
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189337
- DOI
- 10.1016/j.seppur.2021.119368
- ISSN
- 1383-5866
- Abstract
- As phenol represents as the most typical persistent organic pollutants in wastewater, SO4 center dot--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 degrees C, and more resistance towards pH variation, with much stable reaction stoichiometric efficiencies (RSE) ranging from 0.034 to 0.039 at pH = 3 similar to 9, than the other two Co3O4 nanocrystals, making Co3O4-NP with the {112} facet a more outstanding Co3O4 for activating MPS to degrade phenol.
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