Journal
APPLIED SURFACE SCIENCE
Volume 430, Issue -, Pages 371-379Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.06.065
Keywords
g-C3N4; P introducing; Electronic structure; Photocatalytic reduction technology; Radioactive contamination
Categories
Funding
- National Natural Science Foundation of China [51462002, 21403134, 21667003, 51662003]
- Foundation of Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense [Z201408]
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Due to the inherent defects of precursor molecular structure, the limited effect of structure in the formed g-C3N4 will weaken the extension of delocalization of pi electrons between the adjacent tris-triazine or heptazine units of g-C3N4, which thus leads to poor visible-light absorption, low utilization efficiency of charge carrier. Herein, P-introduced g-C3N4 ( PC3N4) photocatalysts were constructed by partially replacing C with tributyl phosphate as precursor, and the as-designed PC3N4 photocatalysts were used to eliminate aqueous uranyl ion by photocatalytic reduction technology under visible-light irradiation. Experimental and DFT revealed that introduction of P into g-C3N4 significantly modified its electronic structure, as reflected by the narrowed band gap, enhanced visible-light absorption as well as improved transfer capability of photogenerated charge. Therefore, photocatalytic activity of PC3N4 was much better than that of pristine g-C3N4 and conventional reducing-type photocatalysts. This study suggests an efficient strategy for construct effective visible-light-responsive photocatalysts for radioactive environmental remediation. (C) 2017 Elsevier B.V. All rights reserved.
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