TY - JOUR
T1 - Activation of persulfates by carbon nanotubes
T2 - Oxidation of organic compounds by nonradical mechanism
AU - Lee, Hongshin
AU - Lee, Hye Jin
AU - Jeong, Joonseon
AU - Lee, Jaesang
AU - Park, Noh Back
AU - Lee, Changha
N1 - Funding Information:
This work was supported by National Research Foundation of Korea (NRF) grants funded by the Korea government (MEST) ( NRF-2012R1A2A2A01006581 , NRF-2013R1A1A2074404 , and NRF-2014M3C8A4031049 ). This work was also financially supported by the KIST-UNIST partnership program ( 2.130404.01 ).
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/4/5
Y1 - 2015/4/5
N2 - Carbon nanotubes (CNTs) have been found to activate persulfates (i.e., peroxymonosulfate and peroxydisulfate) into reactive species that are capable of oxidizing organic compounds in water. In the presence of single- or multi-walled CNTs, persulfates effectively degraded phenolic compounds and certain pharmaceuticals. Phenyl derivatives substituted with electron-withdrawing groups, such as benzoic acid and nitrobenzene, were resistant to degradation by the CNT/persulfate system. Based on observations regarding persulfate decomposition and linear sweep voltammetry using a CNT electrode, it has been suggested that persulfates bind onto the surface of CNTs, forming reactive complexes that are immediately decomposed upon reaction with organic compounds. Electron paramagnetic resonance spectroscopy with spin-trapping indicates that these reactive species are distinct from sulfate radical anions or hydroxyl radicals. The CNT-activated persulfate system shows promise as a novel treatment technology for the selective oxidation of organic contaminants in water.
AB - Carbon nanotubes (CNTs) have been found to activate persulfates (i.e., peroxymonosulfate and peroxydisulfate) into reactive species that are capable of oxidizing organic compounds in water. In the presence of single- or multi-walled CNTs, persulfates effectively degraded phenolic compounds and certain pharmaceuticals. Phenyl derivatives substituted with electron-withdrawing groups, such as benzoic acid and nitrobenzene, were resistant to degradation by the CNT/persulfate system. Based on observations regarding persulfate decomposition and linear sweep voltammetry using a CNT electrode, it has been suggested that persulfates bind onto the surface of CNTs, forming reactive complexes that are immediately decomposed upon reaction with organic compounds. Electron paramagnetic resonance spectroscopy with spin-trapping indicates that these reactive species are distinct from sulfate radical anions or hydroxyl radicals. The CNT-activated persulfate system shows promise as a novel treatment technology for the selective oxidation of organic contaminants in water.
KW - Carbon nanotube
KW - Nonradical mechanism
KW - Organic compounds
KW - Oxidation
KW - Persulfate
UR - http://www.scopus.com/inward/record.url?scp=84920729619&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2014.12.065
DO - 10.1016/j.cej.2014.12.065
M3 - Article
AN - SCOPUS:84920729619
VL - 266
SP - 28
EP - 33
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -