Journal
SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41598-021-94129-0
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Funding
- Vietnamese Ministry of Education and Training [B2021DQN-04]
- Korea Basic Science Institute (National Research Facilities and Equipment Center) - Ministry of Education [2020R 1A 6C101B194]
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The study demonstrates a one-pot solid-state reaction method for preparing MoS2/g-C3N4 composites, with the physicochemical characterization revealing varying component contents at different synthesis temperatures. Composites synthesized at 500 degrees Celsius showed the highest photocatalytic performance, degrading Rhodamine B with an efficiency of 90%, attributed to enhanced light-harvesting and extended charge carriers' lifetime in the composites. The photocatalytic mechanism follows the S-scheme pathway with clear evidences.
Despite pioneering as the holy grail in photocatalysts, abundant reports have demonstrated that g-C3N4 performs poor photocatalytic activity due to its high recombination rate of photo-induced charge carriers. Many efforts have been conducted to overcome this limitation in which the semiconductor-semiconductor coupling strategies toward heterojunction formation were considered as the easiest but the most effective method. Herein, a one-pot solid-state reaction of thiourea and sodium molybdate as precursors at different temperatures under N-2 gas was applied for preparing composites of MoS2/g-C3N4. The physicochemical characterization of the final products determines the variation in contents of components (MoS2 and g-C3N4) via the increase of synthesis temperature. The enhanced photocatalytic activity of the MoS2/g-C3N4 composites was evaluated by the degradation of Rhodamine B in an aqueous solution under visible light. Therein, composites synthesized at 500 degrees C showed the best photocatalytic performance with a degradation efficiency of 90%, much higher than that of single g-C3N4. The significant improvement in photocatalytic performance is attributed to the enhancement in light-harvesting and extension in photo-induced charge carriers' lifetime of composites which are originated from the synergic effect between the components. Besides, the photocatalytic mechanism is demonstrated to well-fit into the S-scheme pathway with apparent evidences.
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