Co3O4 nanocube-decorated nitrogen-doped carbon foam as an enhanced 3-dimensional hierarchical catalyst for activating Oxone to degrade sulfosalicylic acid
- Authors
- Lin, Xin-Ru; Kwon, Eilhann; Hung, Ching; Huang, Chao-Wei; Oh, Wen Da; Lin, Kun-Yi Andrew
- Issue Date
- Feb-2021
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Sulfosalicylic acid; Cobalt oxide; Co3O4; Oxone; Carbon foam; Nitrogen
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.584, pp.749 - 759
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 584
- Start Page
- 749
- End Page
- 759
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/190172
- DOI
- 10.1016/j.jcis.2020.09.104
- ISSN
- 0021-9797
- Abstract
- As sulfosalicylic acid (SUA) is extensively used as a pharmaceutical product, discharge of SUA into the environment becomes an emerging environmental issue because of its low bio-degradability. Thus, SO4 center dot--based advanced oxidation processes have been proposed for degrading SUA because of many advantages of SO4 center dot-. As Oxone represents a dominant reagent for producing SO4 center dot-, and Co is the most capable metal for activating Oxone to generate SO4 center dot-, it is critical to develop an effective but easy-to-use Co-based catalysts for Oxone activation to degrade SUA. Herein, a 3D hierarchical catalyst is specially created by decorating Co3O4 nanocubes (NCs) on macroscale nitrogen-doped carbon form (NCF). This Co3O4-decorated NCF (CONCF) is free-standing, macroscale and even squeezable to exhibit interesting and versatile features. More importantly, CONCF consists of Co3O4 NCs evenly distributed on NCF without aggregation. The NCF not only serves as a support for Co3O4 NCs but also offers additional active sites to synergistically enhance catalytic activities towards Oxone activation. Therefore, CONCF exhibits a higher catalytic activity than the conventional Co3O4 nanoparticles for activating Oxone to fully eliminate SUA in 30 min with a rate constant of 0.142 min(-1). CONCF exhibits a much lower Ea value of SUA degradation (35.2 kJ/mol) than reported values, and stable catalytic activities over multi-cyclic degradation of SUA. The mechanism of SUA degradation is also explored, and degradation intermediates of SUA degradation are identified to provide a possible pathway of SUA degradation. These features validate that CONCF is certainly a promising 3D hierarchical catalyst for enhanced Oxone activation to degrade SUA. The findings obtained here are also insightful to develop efficient heterogeneous Oxone-activating catalysts for eliminating emerging contaminants.
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