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Degradation of 2,4-dichlorophenol by activating persulfate and peroxomonosulfate using micron or nanoscale zero-valent copper.

Authors :
Zhou, Peng
Zhang, Jing
Zhang, Yongli
Zhang, Gucheng
Li, Wenshu
Wei, Chenmo
Liang, Juan
Liu, Ya
Shu, Shihu
Source :
Journal of Hazardous Materials. Feb2018, Vol. 344, p1209-1219. 11p.
Publication Year :
2018

Abstract

The ability of persulfate (PS) and peroxymonosulfate (PMS) activated by micron or nanoscale zero-valent copper (ZVC or nZVC) to degrade 2,4-dichlorophenol (2,4-DCP) was quantified under various conditions. Mechanism investigation revealed that PS and PMS accelerated the corrosion of ZVC or nZVC to release Cu + under acidic conditions. The in-situ generated Cu + further decomposed PS or PMS to produce SO 4 − and OH, which then dramatically degraded 2,4-DCP. The k obs for 2,4-DCP removal followed pseudo-first-order kinetics, k obs of ZVC/PMS and nZVC/PMS systems were 10 ∼ 30 times greater than these in ZVC/PS and nZVC/PS systems. The nZVC/PMS system was most effective to remove 2,4-DCP which even did better than the nZVI/PMS system, with rate constant values ranging from 0.041 to 1.855 min −1 . At higher pH ZVC is ineffective, but nZVC can activate PS and PMS to significantly degrade 2,4-DCP at pH up to 7.3. The 2,4-DCP degradation pathway was found to involve dechloridation, dehydrogenation, hydroxylation, ring open and mineralization. 56.7% and 45.3% of TOC removals were respectively obtained in the ZVC/PMS and nZVC/PMS systems within 120 min. This study helps to comprehend the application of zero-valent metals in reactive radicals-based oxidation processes and the reactivity of Cu + as an activator of PS and PMS. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03043894
Volume :
344
Database :
Academic Search Index
Journal :
Journal of Hazardous Materials
Publication Type :
Academic Journal
Accession number :
126804686
Full Text :
https://doi.org/10.1016/j.jhazmat.2017.11.023