期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 244, 期 -, 页码 475-485出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.069
关键词
g-C3N4; Visible light photocatalysis; Metal doping; Photocatalytic degradation of antibiotics
资金
- National Key Basic Research Program of China [2015CB932003, 2016YFA0203102]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB14020302]
- National Natural Science Foundation of China [21477144, 21337004, 21321004]
Metal doping is an appealing modification strategy of graphitic carbon nitride (g-C3N4) to improve its photo-catalytic activity. The interactions of g-C3N4 precursors with metals, however, has often been underappreciated, which can induce great impacts on g-C3N4 formation and properties. Herein, the impacts of metals (Na, K, Ca, Mg) on the morphology, structure, and photoactivity of urea-derived g-C3N4 were investigated. Our TEM and XPS results confirmed that the interactions of doped metals with urea precursors lead to the incorporation of O atoms from urea molecules into the framework of g-C3N4. Due to the synergistic effects of the metals and structural O atoms, doped g-C3N4 performed an elevated photodegradation of antibiotics under the visible light irradiation, which was attributed to the enhanced light-harvesting and reduced charge recombination. In addition, the doped metals presented uneven regulation on the band structures and morphology of g-C3N4. As a result, both superoxide and hydroxyl radicals were generated by g-CN-Na and g-CN-K, whereas, only superoxide radicals were involved in g-CN, g-CN-Ca and g-CN-Mg. Consequently, diversified photodegradation mechanisms for enrofloxacin (ENR) were observed that the g-CN, g-CN-Ca and g-CN-Mg reaction systems mainly attacked the piperazine moiety of ENR while g-CN-Na and g-CN-K provided additional photodegradation pathway by attacking quinolone core of ENR. The present work could provide new insights into further understanding of doping chemistry with g-C3N4.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据