TY - JOUR
T1 - Atomically dispersed Co-N4 to activate peroxymonosulfate for efficient atrazine degradation
T2 - Synergistic radical and non-radical ways
AU - Yin, Yu
AU - Li, Xuan
AU - Asif, Abdul Hannan
AU - Wang, Shaobin
AU - Sun, Hongqi
N1 - Publisher Copyright:
© 2024
PY - 2024/7/15
Y1 - 2024/7/15
N2 - Cobalt based nanomaterials are widely employed as effective catalysts for peroxymonosulfate (PMS) activation in advanced oxidation processes (AOPs). Single atom catalysts (SACs) are state-of-the-art materials that endow active metal sites with maximal exposure to the reactants. In this study, molybdenum disulfide nanospheres with a crumpled surface (cnMoS2) were designed and synthesized to decorate atomically dispersed Co-N4 sites by immobilizing Co in its unique surface fold structure with a nitrogen/carbon coating. The resulting Co-N-C-cnMoS2 catalysts were used to activate PMS for rapid degradation of atrazine (ATZ). The Co-N4 sites were considered to be the main active sites, enabling the optimal 4.8Co-N-C-cnMoS2 catalyst to remove 100 % of ATZ within 20 min. In addition, 4.8Co-N-C-cnMoS2 catalyst also showed good durability, tolerance to inorganic anions and cations, and high activity in a wide pH range. The cnMoS2 provided a platform to hold atomically Co-N4 sites, played the degradation roles though it was secondary, and moreover accelerated Co2+/Co3+ cycles. In the 4.8Co-N-C-cnMoS2/PMS system, sulfate radical (SO4• ‾), hydroxyl radicals (•OH), superoxide radical (O2• ‾) and singlet oxygen (1O2) were generated, among which SO4• ‾ and 1O2 were the predominant active substances triggering the ATZ degradation.
AB - Cobalt based nanomaterials are widely employed as effective catalysts for peroxymonosulfate (PMS) activation in advanced oxidation processes (AOPs). Single atom catalysts (SACs) are state-of-the-art materials that endow active metal sites with maximal exposure to the reactants. In this study, molybdenum disulfide nanospheres with a crumpled surface (cnMoS2) were designed and synthesized to decorate atomically dispersed Co-N4 sites by immobilizing Co in its unique surface fold structure with a nitrogen/carbon coating. The resulting Co-N-C-cnMoS2 catalysts were used to activate PMS for rapid degradation of atrazine (ATZ). The Co-N4 sites were considered to be the main active sites, enabling the optimal 4.8Co-N-C-cnMoS2 catalyst to remove 100 % of ATZ within 20 min. In addition, 4.8Co-N-C-cnMoS2 catalyst also showed good durability, tolerance to inorganic anions and cations, and high activity in a wide pH range. The cnMoS2 provided a platform to hold atomically Co-N4 sites, played the degradation roles though it was secondary, and moreover accelerated Co2+/Co3+ cycles. In the 4.8Co-N-C-cnMoS2/PMS system, sulfate radical (SO4• ‾), hydroxyl radicals (•OH), superoxide radical (O2• ‾) and singlet oxygen (1O2) were generated, among which SO4• ‾ and 1O2 were the predominant active substances triggering the ATZ degradation.
KW - AOPs
KW - PMS
KW - single atom Co
KW - Singlet oxygen
KW - Sulfate radical
UR - http://www.scopus.com/inward/record.url?scp=85189929107&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2024.160066
DO - 10.1016/j.apsusc.2024.160066
M3 - Article
AN - SCOPUS:85189929107
SN - 0169-4332
VL - 661
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 160066
ER -