https://scholars.lib.ntu.edu.tw/handle/123456789/598705
Title: | Activation of peroxydisulfate by carbon nanotube for the degradation of 2,4-dichlorophenol: Contributions of surface-bound radicals and direct electron transfer | Authors: | Chen C.-Y Cho Y.-C Lin Y.-P. YI-PIN LIN |
Keywords: | Electron transfer;Hydroxyl radical;Multi-walled carbon nanotube;Persulfate;Sulfate radical;Chemical activation;Electron spin resonance spectroscopy;Free radical reactions;Multiwalled carbon nanotubes (MWCN);Organic pollutants;Paramagnetic resonance;Reusability;Sulfur compounds;Surface reactions;X ray photoelectron spectroscopy;Yarn;Dichlorophenols;Direct electron transfer;Hydroxyl radicals;Multi-walled-carbon-nanotubes;Peroxydisulfate;Persulphate;Solution pH;Sulfate radicals;Surface bounds;Electron transitions;2,4 dichlorophenol;carbon nanotube;multi walled nanotube;peroxydisulfate;radical;sulfate;unclassified drug;2,4-dichlorophenol;chlorophenol;activation energy;chlorination;degradation;electron;free radical;adsorption;Article;chemical composition;controlled study;electron spin resonance;electron transport;pH;scanning electron microscopy;surface area;surface property;X ray photoemission spectroscopy;oxidation reduction reaction;Chlorophenols;Electrons;Nanotubes, Carbon;Oxidation-Reduction | Issue Date: | 2021 | Journal Volume: | 283 | Source: | Chemosphere | Abstract: | Carbon materials have been used to activate peroxydisulfate (PDS) for the degradation of organic pollutants. The mechanism involved, especially whether radicals are formed in these processes, is still under debate. In this research, multi-walled carbon nanotube (MWCNT) was employed to activate PDS for the removal of 2,4-dichlorophenol (2,4-DCP). The effects of solution pH, PDS concentration, 2,4-DCP concentration, and MWCNT loading on the degradation of 2,4-DCP were investigated. The mechanism was explored via radical scavenging experiments, electron paramagnetic resonance (EPR) and MWCNT surface characterization. The results showed that the rate of 2,4-DCP degradation increased with the increasing solution pH, PDS concentration and MWCNT loading. The presence of OH[rad] and SO4[rad]? signals in EPR studies, no inhibitory effect in radical scavenging experiments, and the chlorination of MWCNT observed by X-ray photoelectron spectroscopy (XPS) suggested that surface reactions involving both surface-bound radicals and direct electron transfer were responsible for 2,4-DCP degradation. Reusability tests showed that the surface sites responsible for surface-bound radical formation were poisoned after PDS activation, while those responsible for direct electron transfer remained active after five cycles. This research provided the first in-depth insights for the dual roles of MWCNT in the PDS activation process. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109525724&doi=10.1016%2fj.chemosphere.2021.131282&partnerID=40&md5=345c410c46b90e79c4f86c5ef4cce74b https://scholars.lib.ntu.edu.tw/handle/123456789/598705 |
ISSN: | 00456535 | DOI: | 10.1016/j.chemosphere.2021.131282 |
Appears in Collections: | 環境工程學研究所 |
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