期刊
CHEMICAL ENGINEERING JOURNAL
卷 368, 期 -, 页码 896-904出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.03.037
关键词
Graphitic carbon nitride; Cobalt doping; Three-dimensional structure; Nitrogen photofixation; Photocatalysis
资金
- key project of Education Department of Liaoning Province [L2017LZD005]
- Education Department of Liaoning Province [L2014145]
- Natural Science Foundation of Liaoning Province [201602467]
In this work, three-dimensional cobalt doped graphitic carbon nitride was synthesized by molten salt assistant method. XRD, N-2 adsorption, SEM, XPS, UV-Vis spectroscopy, N-2-TPD and Photoluminescence were used to characterize the prepared catalysts. The result shows that the addition of molten salt remarkably changes the morphology of as-prepared catalyst. Cobalt exists as coordinative Co-N bond, which can chemisorb and activate N-2 molecules, and promote the electron transfer from catalyst to the nitrogen molecules. The as-prepared cobalt doped g-C3N4 displays the NH4+ production rate of 5.8 mg.L-1.h(-1)center dot gcat(-1), which is 24 times of bulk g-C3N4. Density functional theory (DFT) simulations show that cobalt doping can not only prolong N equivalent to N bond which activate N-2 molecules, but promote the electrons-holes separation efficiency of g-C3N4. The d orbit of cobalt easily acts as a channel for transferring electrons from the transition metal to the N-2 molecule, which enhances the N-2 photofixation ability.
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