Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 288, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.120588
Keywords
N-n heterojunction; Photocatalytic hydrogen evolution; Eosin-Y sensitized; Special structure
Categories
Funding
- Chinese National Natural ScienceFoundation [21862002]
- Major scientific project of North Minzu University [ZDZX201803]
- Innovation project of North Minzu University [YCX21139]
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The exploration of multiple composite materials with heterojunction structures is important for high-yield hydrogen photocatalytic evolution. In this study, a Mo2S3/Bi2O2CO3 composite with a unique n-n heterojunction and 2D spatial structure was successfully prepared. The composite material with 3% Bi2O2CO3 exhibited the highest photocatalytic effect.
The exploration of multiple composite with heterojunction structures to replace single catalysts with insufficient capacity is significant for the photocatalytic evolution of high-yield hydrogen. In this case, the Mo(2)S3/Bi2O2CO3 composite with a unique n-n heterojunction and two-dimensional (2D) spatial structure was successfully prepared for the first time using the hydrothermal-physical mixture method. The percentage of Bi2O2CO3 in the composite can be easily adjusted by changing the amount of Bi2O2CO3 introduced into the physical mixing process. With a mass percentage of Bi2O2CO3 attained 3% to Mo2S3, the composite Mo2S3/Bi2O2CO3 with n-n heterojunction exhibited the highest photocatalytic effect among all as-prepared samples, with a photocatalytic effect 5 times higher than pure Mo2S3. The presence of Bi(2)O(2)CO3 and the synergistic interactions of n-n heterojunction significantly reduced the dispersity of short-rod shaped Mo2S3, as well as the recombination of photogenerated charge carriers. As a result, electron circulation was improved, and photocatalytic hydrogen evolution activity under visible light was improved. In addition to improving the photocatalytic hydrogen evolution effect, the composite Mo2S3/Bi2O2CO3 has been found to have excellent stability, which is a noteworthy feature. A series of characterization results and semiconductor energy band structure were used to investigate the possible photocatalytic hydrogen evolution mechanism in the Eosin-Y (EY) sensitized Mo2S3/ Bi2O2CO3 system.
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