Journal
APPLIED SURFACE SCIENCE
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148674
Keywords
Peroxymonosulfate; Organic pollutants; Cobalt loading; Fibrous silica; Advanced oxidation; Water treatment
Categories
Funding
- National Natural Science Foundation of China [41676095, 41976140]
- China Postdoctoral Science Fund [219976]
- Guangxi Key R&D Program of China [GUIKE AB18126075]
- Shenzhen Science and Technology Innovation Commission of China [JCYJ20180507182227257, KQTD20180412181334790]
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In this study, cobalt incorporated fibrous silica nanospheres (Co-X/KCC-1) were utilized as catalyst for the activation of peroxymonosulfate (PMS) to degrade phenol and other organic pollutants. The catalyst showed high catalytic activity and stable recycling performance, generating reactive oxygen species (ROS) efficiently. This research provides insights into the potential use of other metal/metal oxides (Fe, Mn, Cu) incorporated KCC-1 for PMS activation.
For activation of peroxymonosulfate (PMS) into reactive oxygen species (ROS), the catalysts with highly exposed active sites and improved mass transfer efficiency is desirable. Herein, cobalt incorporated fibrous silica nanospheres (Co-X/KCC-1) were fabricated by a one-step hydrothermal procedure and used for the first time for PMS activation to degrade phenol and other organic pollutants. In 9.0 minutes, Phenol degradation in the Co-30/KCC1/PMS process, adsorption, sole PMS, and KCC-1/PMS processes reached almost 100%, 3.91%, 15% and 17% respectively. Moreover, 0.01 mg L-1 of Co was leached from Co-30/KCC-1 during reaction. Morphology, structure, texture, and catalytic activity of Co-30/KCC-1 were well-retained after recycling. The use of EPR and scavengers indicated that SO4, center dot OH, O-1(2) , and O-2(center dot) were produced during catalysis with contribution in the order of O-1(2) > O-2(-) > SO4- > center dot OH. In-situ ATR-FTIR, EIS, and XPS showed that the surface complex, and redox couple (Co(II)/Co(III) were responsible for the efficient ROS generation. The high catalytic activity was attributed to highly exposed active sites, radially oriented fibrous morphology, improved textural properties, and the generation of ROS. This research may provide an insight into the use of other metal/metal oxides (Fe, Mn, Cu) incorporated KCC-1 for PMS activation.
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