TY - JOUR
T1 - Defect-mediated Z-scheme carriers’ dynamics of C-ZnO/A-CN toward highly enhanced photocatalytic TC degradation
AU - Huang, Xiaoyan
AU - Zhang, Xiuyun
AU - Zhang, Kexiang
AU - Xue, Xiaogang
AU - Xiong, Jian
AU - Huang, Yu
AU - Zhang, Doudou
AU - Zhang, Jian
AU - Zhang, Zheling
AU - Yan, Fengpo
PY - 2021/10/5
Y1 - 2021/10/5
N2 - Constructing Z-scheme photocatalysts is a promising strategy to improve the photocatalytic performance of materials, wherein carriers’ recombination plays a critical role by tuning carrier transportation and separation. In this study, a defect mediated layered heterojunction of amorphous carbon nitride (A-CN) and carbon doped ZnO (C-ZnO) are designed by calcination of ZIF-8 immersed urea. TEM and SEM elucidate the 2D heterojunctions coupled C-ZnO with a sheet-like A-CN that was formed. FTIR and XPS confirm the existence –N–C[tbnd]N and –N[dbnd]C[dbnd]N– groups interacted with C-ZnO. The defect-mediated C-ZnO/A-CN with 75% A-CN exhibited the highest tetracycline hydrochloride (TC) degradation rate, ~7.7, 3.0 and 7.7 times that of ZnO, loaded ZnO+CN or CN, respectively. Transient PL and photochemical characterizations revealed that defects assisted carriers’ recombination leads to a strong Z-scheme interfacial charge transfer and more reactive centers for TC degradation. This work would provide a new insight for the design of Z-scheme photocatalysts for the removal of pollutants.
AB - Constructing Z-scheme photocatalysts is a promising strategy to improve the photocatalytic performance of materials, wherein carriers’ recombination plays a critical role by tuning carrier transportation and separation. In this study, a defect mediated layered heterojunction of amorphous carbon nitride (A-CN) and carbon doped ZnO (C-ZnO) are designed by calcination of ZIF-8 immersed urea. TEM and SEM elucidate the 2D heterojunctions coupled C-ZnO with a sheet-like A-CN that was formed. FTIR and XPS confirm the existence –N–C[tbnd]N and –N[dbnd]C[dbnd]N– groups interacted with C-ZnO. The defect-mediated C-ZnO/A-CN with 75% A-CN exhibited the highest tetracycline hydrochloride (TC) degradation rate, ~7.7, 3.0 and 7.7 times that of ZnO, loaded ZnO+CN or CN, respectively. Transient PL and photochemical characterizations revealed that defects assisted carriers’ recombination leads to a strong Z-scheme interfacial charge transfer and more reactive centers for TC degradation. This work would provide a new insight for the design of Z-scheme photocatalysts for the removal of pollutants.
KW - Defect mediated Z-scheme
KW - Interfacial interaction
KW - Photocatalytic TC degradation
KW - Synergistic effect
UR - http://www.scopus.com/inward/record.url?scp=85106226198&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2021.160321
DO - 10.1016/j.jallcom.2021.160321
M3 - Article
AN - SCOPUS:85106226198
SN - 0925-8388
VL - 877
SP - 1
EP - 12
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 160321
ER -