Construction of 2D/2D MoS2/g-C3N4 heterostructures for photoreduction of Cr (VI)
Authors:
- Chuanjie Wang,
- Guanglei Yang,
- Wenbin Shi,
- Katarzyna Matras-Postolek,
- Ping Yang
Abstract
2D/2D MoS2/g-C3N4 (MCN) surface heterostructures were created by second thermal polymerization of bulk g-C3N4 and the reaction of thiourea and MoO3 at 670 °C. MoS2 networks grew vertically along the (002) facet on superior thin g-C3N4 nanosheets. The layered heterostructures drastically improved the Cr(VI) removal ability. In the dark case, 27% of Cr(VI) was removed within 45 min. The result indicates that the adsorption of Cr(VI) was a chemical adsorption process involving the sharing and transfer of electrons. The equilibrium data indicate that the adsorbent was covered with a monolayer adsorbate, which conformed to the Langmuir isotherm model (R2 = 0.9618). In addition, MCN nanocomposites could convert Cr(VI) into non-toxic Cr(III) by photoreduction under visible light irradiation. With an optimized composition, 100% of Cr(VI) was removed within 30 min, which was ∼10 times quicker compared with Cr(VI) removal under dark conditions. Because g-C3N4 nanosheets (sample CN670) with higher photocurrent density revealed the lowest photoreduction Cr(VI) ability, adsorption plays an important role in Cr(VI) removal. For MoS2/g-C3N4 nanocomposites used in Cr(VI) removal, adsorption and photoreduction were incorporated together to get excellent performance.
- Record ID
- CUT53e36f14293c4c0ab65486105074f10a
- Publication categories
- ;
- Author
- Journal series
- Langmuir, ISSN 0743-7463, e-ISSN 1520-5827
- Issue year
- 2021
- Vol
- 37
- No
- 20
- Pages
- 6337-6346
- Other elements of collation
- fot.; rys.; schem.; tab.; wykr.; Bibliografia (na s.) - 6344-6346; Bibliografia (liczba pozycji) - 52; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 37, Iss. 20
- Keywords in English
- MoS2/g-C3N4, nanocomposites, g-C3N4, nanosheets, electromagnetic radiation, adsorption, diffusion, equilibrium, ions
- DOI
- DOI:10.1021/acs.langmuir.1c00929 Opening in a new tab
- URL
- https://pubs.acs.org/doi/full/10.1021/acs.langmuir.1c00929 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 100
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT53e36f14293c4c0ab65486105074f10a/
- URN
urn:pkr-prod:CUT53e36f14293c4c0ab65486105074f10a
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.