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Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles
A novel photocatalyst based on the design of P-N heterojunction between hollow spherical Mn(3)O(4) and nanorods shape of α-Ag(2)WO(4) is synthesized using a sonication-deposition–precipitation route. The nanocomposite Mn(3)O(4)/α-Ag(2)WO(4)(60%) exhibits a great potential towards nitroarenes (includ...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7725972/ https://www.ncbi.nlm.nih.gov/pubmed/33299028 http://dx.doi.org/10.1038/s41598-020-78542-5 |
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author | Mohamed, Mohamed Mokhtar El-Farsy, Hassan |
author_facet | Mohamed, Mohamed Mokhtar El-Farsy, Hassan |
author_sort | Mohamed, Mohamed Mokhtar |
collection | PubMed |
description | A novel photocatalyst based on the design of P-N heterojunction between hollow spherical Mn(3)O(4) and nanorods shape of α-Ag(2)WO(4) is synthesized using a sonication-deposition–precipitation route. The nanocomposite Mn(3)O(4)/α-Ag(2)WO(4)(60%) exhibits a great potential towards nitroarenes (including 4-nitrophenol, 4-nitro-aniline and 4-Nitro-acetanilide) reduction under visible light irradiation exceeding that of Mn(3)O(4)/α-Ag(2)WO(4)(40%) as well as their individual counterparts (3–5%). The Mn(3)O(4)/α-Ag(2)WO(4)(60%) catalyst exhibited an excellent photo-reduction activity comprised of 0.067 s(−1) towards 4-nitrophenol (0.001 M) in only 60 s reaction time using NaBH(4) (0.2 M). This was due to the successful formation of the Mn(3)O(4)/α-Ag(2)WO(4) composite as validated by XRD, TEM-SAED, XPS, FTIR, UV–Vis diffuse reflectance and PL techniques. Decreasing the E(g) value into 2.7 eV, the existence of a new (151) plane in the composite beside enhancement of the composite electrical conductivity (1.66 × 10(–7) Ω(−1) cm(−1)) helps the facile nitroarenes adsorption and hydrogenation. Transient photocurrent response and linear sweep voltammetry results prove the facilitation of photogenerated charge carriers separation and transport via improving electron lifetime and lessening recombination rate. The composite photocatalyst produced higher amounts of H(2) production, when inserted in a typical reaction medium containing NaBH(4), comprised of 470 µ mole/g exceeding those of the counterparts (35 µ mole/g). This photocatalyst is strikingly hydrogenated 4-nitrophenol under mild conditions (25 °C and 0.35 MPa pressure of H(2)) with magnificent rate constant equal 34.9 × 10(−3) min(−1) with 100% selectivity towards 4-aminophenol. |
format | Online Article Text |
id | pubmed-7725972 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-77259722020-12-14 Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles Mohamed, Mohamed Mokhtar El-Farsy, Hassan Sci Rep Article A novel photocatalyst based on the design of P-N heterojunction between hollow spherical Mn(3)O(4) and nanorods shape of α-Ag(2)WO(4) is synthesized using a sonication-deposition–precipitation route. The nanocomposite Mn(3)O(4)/α-Ag(2)WO(4)(60%) exhibits a great potential towards nitroarenes (including 4-nitrophenol, 4-nitro-aniline and 4-Nitro-acetanilide) reduction under visible light irradiation exceeding that of Mn(3)O(4)/α-Ag(2)WO(4)(40%) as well as their individual counterparts (3–5%). The Mn(3)O(4)/α-Ag(2)WO(4)(60%) catalyst exhibited an excellent photo-reduction activity comprised of 0.067 s(−1) towards 4-nitrophenol (0.001 M) in only 60 s reaction time using NaBH(4) (0.2 M). This was due to the successful formation of the Mn(3)O(4)/α-Ag(2)WO(4) composite as validated by XRD, TEM-SAED, XPS, FTIR, UV–Vis diffuse reflectance and PL techniques. Decreasing the E(g) value into 2.7 eV, the existence of a new (151) plane in the composite beside enhancement of the composite electrical conductivity (1.66 × 10(–7) Ω(−1) cm(−1)) helps the facile nitroarenes adsorption and hydrogenation. Transient photocurrent response and linear sweep voltammetry results prove the facilitation of photogenerated charge carriers separation and transport via improving electron lifetime and lessening recombination rate. The composite photocatalyst produced higher amounts of H(2) production, when inserted in a typical reaction medium containing NaBH(4), comprised of 470 µ mole/g exceeding those of the counterparts (35 µ mole/g). This photocatalyst is strikingly hydrogenated 4-nitrophenol under mild conditions (25 °C and 0.35 MPa pressure of H(2)) with magnificent rate constant equal 34.9 × 10(−3) min(−1) with 100% selectivity towards 4-aminophenol. Nature Publishing Group UK 2020-12-09 /pmc/articles/PMC7725972/ /pubmed/33299028 http://dx.doi.org/10.1038/s41598-020-78542-5 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Mohamed, Mohamed Mokhtar El-Farsy, Hassan Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title | Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title_full | Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title_fullStr | Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title_full_unstemmed | Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title_short | Rapid reduction of nitroarenes photocatalyzed by an innovative Mn(3)O(4)/α-Ag(2)WO(4) nanoparticles |
title_sort | rapid reduction of nitroarenes photocatalyzed by an innovative mn(3)o(4)/α-ag(2)wo(4) nanoparticles |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7725972/ https://www.ncbi.nlm.nih.gov/pubmed/33299028 http://dx.doi.org/10.1038/s41598-020-78542-5 |
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