Synthesis of MoS 2 nanosheets loaded ZnO–g-C 3 N 4 nanocomposites for enhanced photocatalytic applications
| Autor: | Wan-Kuen Jo, Joon Yeob Lee, N. Clament Sagaya Selvam |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Nanocomposite
Photoluminescence Materials science General Chemical Engineering Composite number Heterojunction Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint Industrial and Manufacturing Engineering 0104 chemical sciences Chemical engineering Photocatalysis Environmental Chemistry Charge carrier 0210 nano-technology Ternary operation |
| Zdroj: | Chemical Engineering Journal. 289:306-318 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2015.12.080 |
| Popis: | This article reports the preparation of pure, binary and ternary photocatalysts. Colloids of the exfoliated two-dimensional g-C 3 N 4 and MoS 2 nanosheets were used for binary ZnO–g-C 3 N 4 and ternary MoS 2 -loaded ZnO–g-C 3 N 4 nanocomposites preparation. The exfoliation process, as well as the structures, morphologies, and photophysical properties of the pure and composite photocatalysts were investigated using various spectroscopic and microscopic techniques. The ZnO nanospheres were embedded themselves in the co-stacked g-C 3 N 4 /MoS 2 nanosheets. The absorbance of binary and ternary nanocomposites extended into the visible-region compared to bare photocatalysts. The photocatalytic degradation of methylene blue, a common dye, and atrazine, a potent herbicide, in aqueous medium was investigated using both pure and composite photocatalysts. Ternary nanocomposites exhibited superior photocatalytic performance than the binary and pure photocatalysts. The co-stacked g-C 3 N 4 /MoS 2 nanosheets attached ZnO nanospheres in the ternary nanocomposite had an intimate connection, which facilitated effective migration and separation of charge carriers across the ZnO/g-C 3 N 4 interface of heterojunction. Furthermore, in the ternary nanocomposite, few-layer MoS 2 co-catalyst accelerated the electron transfer on the interface of ZnO and g-C 3 N 4 , and thus significantly improved the lifetime of charge carriers. Based on the photoluminescence emission and band potentials of photocatalysts, the enhanced charge separation mechanism for the ternary nanocomposite was proposed. The degradation pathway of atrazine was investigated using LC/MS/MS, and the possible degradation mechanism was proposed. |
| Databáze: | OpenAIRE |
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