Journal
CATALYSIS LETTERS
Volume 152, Issue 7, Pages 1981-1989Publisher
SPRINGER
DOI: 10.1007/s10562-021-03814-2
Keywords
Uranium; Photoreduction; MoS2; C3N4; Superoxide radical
Categories
Funding
- Fundamental Research Funds of the Central Universities [2021MS036]
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The Z-scheme MoS2/g-C3N4 heterojunction was fabricated to enhance removal of U(VI) from aqueous solution by increasing separation efficiency of photogenerated charge. Approximately 82% of UO22+ was photo-reduced by MoS2/g-C3N4 after 1 h of light irradiation, with the high effective photocatalytic reduction attributed to O-2(-) radicals.
Graphitic carbon nitride (g-C3N4) has been paid increasingly attentions in U(VI) removal due to the visible-light response, whereas the high recombination of photogenerated electron and holes limited the actual environmental application. Herein, Z-scheme MoS2/g-C3N4 heterojunction was fabricated to enhance removal of U(VI) from aqueous solution. The microscopic and spectroscopic characterizations showed that addition of MoS2 on surface of g-C3N4 increased separation efficiency of photogenerated charge, decreased the bandgap and improved the intensity of light adsorption. Approximate 82% of UO22+ was photo-reduced by MoS2/g-C3N4 after 1 h of light irradiation at pH 4.5. The high effective photocatalytic reduction of U(VI) on MoS2/g-C3N4 was attributed to center dot O-2(-) radials according to quenching experiments. XPS analysis showed that the adsorbed U(VI) was photo-reduced into U(IV). These findings are crucial for the design of C3N4-based composites with high efficient photocatalytic performance and exclusive selectivity into actual environmental cleanup.
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