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• W4200261846 endingPage "134090" @default.
• W4200261846 startingPage "134090" @default.
• W4200261846 abstract "Mechanochemical (MC) treatment utilizing calcium oxide (CaO) and peroxydisulfate (PDS) for halogenated organic pollutants (HOPs) has been developed for pure substance degradation and contaminated soil remediation. However, the role of CaO and the mechanism of PDS activation in solid phase reaction remain unclear. This study was dedicated to decipher CaO-induced PDS activation for destruction of typical HOPs such as 2,4-dichlorophenol (2,4-DCP), in a low energy single-cylinder horizontal vibrational mill. With mass ratio of CaO:PDS:2,4-DCP = 6.3:6.7:1, CaO-PDS as co-milling agents destructs 2,4-DCP with much higher degradation and dechlorination rate than CaO (about 13.9- and 121.2-fold) or PDS (about 2.5- and 9.4-fold) only. According to detection of intermediates and measurement of total organic carbon, the CaO addition shifts the degradation pathway into dechlorination and ring-open routes, and increase mineralization efficiency from 64% (PDS only) to 96%. Quenching test suggests •OHsurf is the dominant oxidative species with CaO-PDS as co-milling agents, which enables complete oxidative destruction. PDS in such MC system is activated mainly via electron transfer (∼50.6%), followed by base activation (∼40.5%) and energy transfer (＜ 8.9%). CaO plays a dual role in activating PDS and transforming SO4•−surf to •OHsurf. Finally, CaO-PDS shows high reactivity in destructing persistent HOPs like polybrominated phenols and polychlorinated benzenes, which expands its potential in practical application. This study may guide the selection of effective oxidative co-milling agents for mineralization of solid HOPs by mechanochemistry, facilitating safe disposal of obsolete HOPs." @default.
• W4200261846 created "2021-12-31" @default.
• W4200261846 creator A5018179432 @default.
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• W4200261846 creator A5059560050 @default.
• W4200261846 creator A5060840317 @default.
• W4200261846 creator A5082433815 @default.
• W4200261846 date "2022-03-01" @default.
• W4200261846 modified "2023-09-22" @default.
• W4200261846 title "Deciphering CaO-induced peroxydisulfate activation for destruction of halogenated organic pollutants in a low energy vibrational mill" @default.
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• W4200261846 doi "https://doi.org/10.1016/j.cej.2021.134090" @default.
• W4200261846 hasPublicationYear "2022" @default.
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