TY - JOUR
T1 - Enhancing O2 adsorption and activation over porous S-doped g-C3N4 rod toward efficient photocatalytic rhodamine-B degradation
AU - Xie, Zhuohong
AU - Lin, Jianbin
AU - Zhang, Weibin
AU - Zhang, Chi
AU - Yang, Woochul
N1 - Publisher Copyright:
© 2023
PY - 2024/1
Y1 - 2024/1
N2 - Photocatalytic oxygen molecular (O2) activation to generate reactive oxygen species (ROS) is a promising strategy for the oxidative degradation of organic pollutants. Herein, a porous S-doped g-C3N4 rod (S-g-CN-rod) was synthesized and applied to photocatalytic superoxide radicals (·O2-) evolution and rhodamine-B (RhB) degradation. The morphological, structural, and optical properties of all samples were investigated. DFT calculation demonstrated that the carbon site adjacent to S was energetically favorable for O2 adsorption, which was conducive to ·O2- evolution. The porous S-g-CN-rod exhibited an excellent photocatalytic ·O2- evolution rate of 268.2 μmol L−1 h−1, which was the main active species to degrade RhB. Conceivably, the porous S-g-CN-rod demonstrated exceptionally high efficiency of photocatalytic RhB degradation and achieved almost complete disposal of RhB (99.7 %) in only 30 min, which was higher than most reported photocatalysts. The experimental results and theoretical calculations demonstrated that the preeminent photocatalytic activities were ascribed to enhanced light-harvesting, improved migration and separation of photo-induced electrons, and the superior O2 adsorption and activation induced by S doping.
AB - Photocatalytic oxygen molecular (O2) activation to generate reactive oxygen species (ROS) is a promising strategy for the oxidative degradation of organic pollutants. Herein, a porous S-doped g-C3N4 rod (S-g-CN-rod) was synthesized and applied to photocatalytic superoxide radicals (·O2-) evolution and rhodamine-B (RhB) degradation. The morphological, structural, and optical properties of all samples were investigated. DFT calculation demonstrated that the carbon site adjacent to S was energetically favorable for O2 adsorption, which was conducive to ·O2- evolution. The porous S-g-CN-rod exhibited an excellent photocatalytic ·O2- evolution rate of 268.2 μmol L−1 h−1, which was the main active species to degrade RhB. Conceivably, the porous S-g-CN-rod demonstrated exceptionally high efficiency of photocatalytic RhB degradation and achieved almost complete disposal of RhB (99.7 %) in only 30 min, which was higher than most reported photocatalysts. The experimental results and theoretical calculations demonstrated that the preeminent photocatalytic activities were ascribed to enhanced light-harvesting, improved migration and separation of photo-induced electrons, and the superior O2 adsorption and activation induced by S doping.
KW - Oxygen adsorption
KW - Photocatalytic degradation
KW - Sulfur doped g-CN
KW - Superoxide radical evolution
UR - http://www.scopus.com/inward/record.url?scp=85178338422&partnerID=8YFLogxK
U2 - 10.1016/j.diamond.2023.110658
DO - 10.1016/j.diamond.2023.110658
M3 - Article
AN - SCOPUS:85178338422
SN - 0925-9635
VL - 141
JO - Diamond and Related Materials
JF - Diamond and Related Materials
M1 - 110658
ER -