TY - JOUR
T1 - Generating 1O2 and CoIV=O through efficient peroxymonosulfate activation by ZnCo2O4 nanosheets for pollutant control
AU - Zhang, Xiaoke
AU - Zhang, Yangyang
AU - Tian, Jiaqi
AU - Guo, Yadan
AU - Zhou, Zhongkui
AU - Liu, Zhongyi
AU - Zhao, Zaiwang
AU - Liu, Bin
AU - Li, Jun
PY - 2024/9
Y1 - 2024/9
N2 - Heterogeneous advanced oxidation processes (AOPs) based on non-radical reactive species are considered as a powerful technology for wastewater purification due to their long half-lives and high adaptation in a wide pH range. Herein, we fabricate surface Co defect-rich spinel ZnCo2O4 porous nanosheets, which can generate ≡CoIV=O and 1O2 over a wide pH range of 3.81–10.96 by the formation of amphoteric ≡Zn(OH)2 in peroxymonosulfate (PMS) activation process. Density functional theory (DFT) calculations show Co defect-rich ZnCo2O4 possesses much stronger adsorption ability and more electron transfer to PMS. Moreover, the adsorption mode changes from terminal oxygen Co–O–Co to Co–O, accelerating the polarization of adjacent oxygen, which is beneficial to the generation of ≡CoIV=O and 1O2. Co defect-rich ZnCo2O4 porous nanosheets exhibit highly active PMS activation activity and stability in p-nitrophenol (PNP) degradation, whose toxicity of degradation intermediates is significant reduction. The Co defect-rich ZnCo2O4 nanosheet catalyst sponge/PMS system achieved stable and efficient removal of PNP with a removal efficiency higher than 93% over 10 h. This work highlights the development of functional catalyst and provides an atomic-level understanding into non-radical PMS activation process in wastewater treatment. (Figure presented.) © Tsinghua University Press 2024.
AB - Heterogeneous advanced oxidation processes (AOPs) based on non-radical reactive species are considered as a powerful technology for wastewater purification due to their long half-lives and high adaptation in a wide pH range. Herein, we fabricate surface Co defect-rich spinel ZnCo2O4 porous nanosheets, which can generate ≡CoIV=O and 1O2 over a wide pH range of 3.81–10.96 by the formation of amphoteric ≡Zn(OH)2 in peroxymonosulfate (PMS) activation process. Density functional theory (DFT) calculations show Co defect-rich ZnCo2O4 possesses much stronger adsorption ability and more electron transfer to PMS. Moreover, the adsorption mode changes from terminal oxygen Co–O–Co to Co–O, accelerating the polarization of adjacent oxygen, which is beneficial to the generation of ≡CoIV=O and 1O2. Co defect-rich ZnCo2O4 porous nanosheets exhibit highly active PMS activation activity and stability in p-nitrophenol (PNP) degradation, whose toxicity of degradation intermediates is significant reduction. The Co defect-rich ZnCo2O4 nanosheet catalyst sponge/PMS system achieved stable and efficient removal of PNP with a removal efficiency higher than 93% over 10 h. This work highlights the development of functional catalyst and provides an atomic-level understanding into non-radical PMS activation process in wastewater treatment. (Figure presented.) © Tsinghua University Press 2024.
KW - advanced oxidation processes
KW - CoIV=O
KW - peroxymonosulfate activation
KW - wastewater treatment
KW - ZnCo2O4 nanosheets
UR - http://www.scopus.com/inward/record.url?scp=85199412046&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85199412046&origin=recordpage
U2 - 10.1007/s12274-024-6836-6
DO - 10.1007/s12274-024-6836-6
M3 - RGC 21 - Publication in refereed journal
SN - 1998-0124
VL - 17
SP - 8025
EP - 8035
JO - Nano Research
JF - Nano Research
IS - 9
ER -