TY - JOUR
T1 - Peroxymonosulfate activation by carbon-encapsulated metal nanoparticles
T2 - Switching the primary reaction route and increasing chemical stability
AU - Yun, Eun Tae
AU - Park, Sung Woo
AU - Shin, Hyun Jung
AU - Lee, Hongshin
AU - Kim, Dong Wan
AU - Lee, Jaesang
N1 - Funding Information:
This study was supported by a National Research Foundation of Korea grant funded by the Korean government ( MSIP ) [Grant No. NRF-2018R1A4A1022194 ] and a National Research Foundation of Korea grant funded by the Ministry of Science, ICT, and Future Planning [Grant No. 2016M3A7B4909318 ].
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - This study explores the technical merits of carbon encapsulation via an electrical wire explosion method to enhance the peroxymonosulfate activation performance of metals. Reflecting the nature of core-shell structures, the outer carbon layers hampered the reductive conversion of peroxymonosulfate to sulfate radicals by the inner metal cores, whereas the metal cores increased the overall electrical conductivity as a pivotal factor in non-radical activation. Hence, the impact of carbon wrapping hinged on the peroxymonosulfate reduction capability of the metals, i.e., kinetic retardation in organic degradation with reactive Cu, Fe, and Ni-Fe, but acceleration with unreactive Ni. Further, composite fabrication switched the major degradative pathway from radical-induced oxidation to mediated electron transfer, as determined from the effects of methanol and chloride, formaldehyde and bromate formation yields, reactivity toward multiple organics, and electron paramagnetic resonance spectral features. The protective carbon shells enabled pH-insensitive peroxymonosulfate activation, prevented metal ion leaching, and alleviated catalyst deactivation.
AB - This study explores the technical merits of carbon encapsulation via an electrical wire explosion method to enhance the peroxymonosulfate activation performance of metals. Reflecting the nature of core-shell structures, the outer carbon layers hampered the reductive conversion of peroxymonosulfate to sulfate radicals by the inner metal cores, whereas the metal cores increased the overall electrical conductivity as a pivotal factor in non-radical activation. Hence, the impact of carbon wrapping hinged on the peroxymonosulfate reduction capability of the metals, i.e., kinetic retardation in organic degradation with reactive Cu, Fe, and Ni-Fe, but acceleration with unreactive Ni. Further, composite fabrication switched the major degradative pathway from radical-induced oxidation to mediated electron transfer, as determined from the effects of methanol and chloride, formaldehyde and bromate formation yields, reactivity toward multiple organics, and electron paramagnetic resonance spectral features. The protective carbon shells enabled pH-insensitive peroxymonosulfate activation, prevented metal ion leaching, and alleviated catalyst deactivation.
KW - Carbon encapsulation
KW - Chemical stability
KW - Mediated electron transfer
KW - Peroxymonosulfate activation
KW - Primary degradative pathway transition
UR - http://www.scopus.com/inward/record.url?scp=85088539978&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2020.119360
DO - 10.1016/j.apcatb.2020.119360
M3 - Article
AN - SCOPUS:85088539978
SN - 0926-3373
VL - 279
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 119360
ER -