Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 584, Issue -, Pages 749-759Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.09.104
Keywords
Sulfosalicylic acid; Cobalt oxide; Co3O4; Oxone; Carbon foam; Nitrogen
Categories
Funding
- Ministry of Science and Technology (MOST), Taiwan [109-2636-E-005-003-]
- Innovation and Development Center of Sustainable Agriculturefrom The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE), Taiwan
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A 3D hierarchical catalyst CONCF, decorated with Co3O4 nanocubes on macro nitrogen-doped carbon form, exhibits higher catalytic activity compared to traditional Co3O4 nanoparticles for degrading SUA, showing a stable catalytic performance over multi-cyclic degradation of SUA.
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. (C) 2020 Elsevier Inc. All rights reserved.
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