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Accelerating Surface Photoreactions Using MoS 2 -FeS 2 Nanoadsorbents: Photoreduction of Cr(VI) to Cr(III) and Photodegradation of Methylene Blue.
- Source :
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Inorganic chemistry [Inorg Chem] 2022 Jan 17; Vol. 61 (2), pp. 1118-1129. Date of Electronic Publication: 2021 Dec 30. - Publication Year :
- 2022
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Abstract
- Nanocubic MoS <subscript>2</subscript> -FeS <subscript>2</subscript> , as a photocatalyst, was synthesized with high catalytic active edges and high specific surface areas with the capability of absorbing visible light. The results showed that the photocatalytic efficiency of nanocubic MoS <subscript>2</subscript> -FeS <subscript>2</subscript> for adsorption/degradation of methylene blue (MB) as well as the reduction of Cr(VI) was high. The adsorption process was found to follow a kinetic model of a pseudo-second-order kind ( Q <subscript>e.cal</subscript> = 464 mg g <superscript>-1</superscript> ) along with an isotherm described by the Langmuir model with Q <subscript>e.cal</subscript> = 340 mg g <superscript>-1</superscript> . The photodegradation process was achieved by holes. It was found that the photodegradation rate constant of MB by MoS <subscript>2</subscript> -FeS <subscript>2</subscript> (0.203 min <superscript>-1</superscript> ) was about 22 times higher than that of MoS <subscript>2</subscript> (0.0091 min <superscript>-1</superscript> ). The percent apparent quantum yield for photoreduction of Cr(VI) to Cr(III) using MoS <subscript>2</subscript> -FeS <subscript>2</subscript> (5.7%) was about 33 times higher than utilizing MoS <subscript>2</subscript> (0.1709%). Therefore, the synergistically prolonged visible-light harvesting as well as the photocarrier diffusion length proved that MoS <subscript>2</subscript> -FeS <subscript>2</subscript> nanotubes can effectively be utilized in environmental pollutant's remediation.
Details
- Language :
- English
- ISSN :
- 1520-510X
- Volume :
- 61
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Inorganic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 34969241
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.1c03290