Journal
CHEMOSPHERE
Volume 267, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128906
Keywords
Salicylic acid; Cobalt ferrite; Monopersulfate; Carbon sponge; Nitrogen
Categories
Funding
- Ministry of Science and Technology (MOST), Taiwan [109-2636-E-005-003-]
- Innovation and Development Center of Sustainable Agriculture from The Featured Areas Research Center Program
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A new 3D hierarchical catalyst is proposed in this study, which enhances the activation of monopersulfate by loading CoFe2O4 nanoparticles on nitrogen-doped carbon sponge, resulting in complete degradation of salicylic acid within 30 minutes. The catalyst exhibits lower activation energy and higher degradation efficiency compared to other reported catalysts, making it a promising candidate for degrading contaminants.
As salicylic acid (SAL) is increasingly consumed as a pharmaceutical product, release of SAL into the environment poses threats to ecology because of its low bio-degradability. Thus, SO4 center dot--based chemical oxidation processes have been proposed for degrading SAL. Since monopersulfate (MPS) represents a primary reagent for generating SO4 center dot-, and Co is the most capable metal for activating MPS to generate SO4 center dot-, C3O4 NPs are frequently proposed for activating MPS but they are difficult to recover from water. Thus CoFe2O4 is considered as a magnetic alternative to Co3O4, and loading of CoFe2O4 NPs on substrates could further improve dispersion and avoid aggregation of NPs. Therefore, this study proposes a 3Dimensional (3D) hierarchical catalyst which is fabricated by loading CoFe2O4 NPs on nitrogen-doped carbon sponge (NCS). The NCS is not only adopted as a support for CoFe2O4 NPs but also provides additional catalytic sites and enhances catalytic activities of CoFe2O4 NPs for MPS activation. As a result, CoFe2O4 NPs loaded on NCS (CFNCS) exhibits substantially higher catalytic activities than CoFe2O4 NPs and NCS individually with 100% of SAL could be afforded within 30 min. E-a of SAL degradation of 47.4 kJ/mol by CFNCS-activated MPS is also lower than those by other reported catalysts, whereas the RSE was 11.1%, which was also much higher than most of reported values. These features demonstrate that CFNCS is a promising 3D catalyst for enhancing MPS activation to degrade SAL. The findings obtained here are also insightful to develop efficient MPS-activating catalysts for eliminating contaminants. (C) 2020 Elsevier Ltd. All rights reserved.
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