Enhanced molecular molecular oxygen activation of Ni2+-doped BiO2-x nanosheets under UV, visible and near-infrared irradiation: Mechanism and DFT study 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications
年/卷/期
2018 / 234 /
页码
167-177
ISSN号
0926-3373
作者单位
Wuhan Univ Technol, Sch Resources & Environm Engn, Hubei Prov Collaborat Innovat Ctr High Efficient, Hubei Key Lab Mineral Resources Proc & Environm, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China;Wuhan Univ Technol, Sch Resources & Environm Engn, Hubei Prov Collaborat Innovat Ctr High Efficient, Hubei Key Lab Mineral Resources Proc & Environm, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China;Wuhan Univ Technol, Sch Resources & Environm Engn, Hubei Prov Collaborat Innovat Ctr High Efficient, Hubei Key Lab Mineral Resources Proc & Environm, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China;Wuhan Univ Technol, Sch Resources & Environm Engn, Hubei Prov Collaborat Innovat Ctr High Efficient, Hubei Key Lab Mineral Resources Proc & Environm, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China;Wuhan Univ Technol, Sch Resources & Environm Engn, Hubei Prov Collaborat Innovat Ctr High Efficient, Hubei Key Lab Mineral Resources Proc & Environm, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China;
作者
Zhang, Gaoke;Li, Yuan;Wang, Kai;Li, Jun;Wang, Jia;
摘要
Although molecular oxygen activation plays a significant role in photocatalytic process for pollutants removal, it is still challenging to activate molecular oxygen into superoxide radical (center dot O-2(-)) by photocatalysts under nearinfrared (NIR) light irradiation. Herein, we successfully synthesized 'Ni2+-doped BiO(2-x )nanosheets, which could efficiently achieve the molecular oxygen activation into center dot O-2(-) under ultraviolet (UV), visible and NIR irradiation. Meanwhile, we found the doping Ni2+ facilitated the formation of BiO2-x nanosheets. More importantly, the contribution of doping Ni(2+ )on full spectrum molecular oxygen activation over Ni2+-doped BiO2-x was further confirmed by experiments and density functional theory (DFT) study. The introduction of Ni2+ into BiO2-x, structure resulted in the formation of a new doping energy level band between the valence band (VB) and conduction band (CB) of Ni2+-doped BiO(2-x )which contributed to the faster separation of carriers and highly efficient full spectrum driven molecular oxygen activation under UV, visible and NIR irradiation, especially with the irradiation of NIR light as compared to BiO2-x. In addition, the doping Ni2+ promoted the optical absorption property of BiO2-x with narrowing band gap and the up-shift position of VB and CB. As expected, the Ni2+-doped BiO2-x nanosheets exhibited enhanced photocatalytic activity for rhodamine B (RhB) degradation under UV, visible and NIR irradiation than pure BiO(2-x )nanosheets. The photocatalyst still revealed high photocatalytic activity even after five cycles. Finally, a possible photocatalytic mechanism of the degradation processes by Ni2+-doped BiO2-x was proposed. This work not only confirmed Ni2+ doping could promote the formation of BiO2-x nanosheets and enhance their full spectrum driven molecular oxygen activation ability, but also presented an in-depth understanding on the mechanism of full spectrum driven molecular oxygen activation.
机翻摘要
暂无翻译结果,您可以尝试点击头部的翻译按钮。
关键词/主题词
BiO2-x nanosheet;Molecular oxygen activation;Doping;Near-infrared light;DFT calculations;
若您需要申请原文,请登录。

最新评论

暂无评论。

登录后可以发表评论

意见反馈
返回顶部