Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+)
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/170604 |
Resumo: | Au/TiO2 NPs have been successfully prepared at 130 C in one day using an ionic liquid assisted hydrothermal method using methoxyethyl methyl imidazolium methanesulfonate as the ionic liquid, titanium(IV) isopropoxide and tetrachloroaurate(III) trihydrate as precursors. Physico-chemical properties of the obtained photocatalysts were investigated via thorough characterizations. The framework substitution of Au in TiO2 NPs was established by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) techniques. X-ray diffraction (XRD) and transmission electron microscopy (TEM) image results confirmed the anatase phase and nanocrystalline nature of Au/TiO2. The optical properties revealed an extended tailing of the absorption edge toward the visible region upon Au doping. The concentration of Au in the TiO2 matrix has been fine-tuned to improve the hydrogen production, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) But there are no reports utilizing a single material for all three applications such as photocatalytic hydrogen production from water and photochemical as well as electrochemical reduction of Cr6+ to Cr3+. The synergy between the Au and TiO2 has an optimum for concentration of 0.5 wt% Au doped TiO2. The optimized product has produced promising hydrogen evolution of 3344 mmol g 1 under illumination with a visible light source in a water/ethanol system. The optimized product has shown promising electrocatalytic reduction and the photocatalytic detoxification ability of the material towards Cr6+ was explored. Amperometric studies showed a linear range from 0.1 to 2.7 mM, and limits of detection and quantification of 0.01 mM and 0.023 mM, respectively. The Au/TiO2 nanoparticle modified glassy carbon has been used for electrochemical monitoring of Cr6+ in natural water samples. The material also showed better photochemical reduction of Cr6+ in sunlight compared to UV light. |
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Ravishankar, Thammadihalli NanjundaiahVaz, Maurício de OliveiraRamakrishnappa, ThippeswamyTeixeira, Sergio RibeiroDupont, Jairton2017-11-28T02:29:12Z20172046-2069http://hdl.handle.net/10183/170604001052393Au/TiO2 NPs have been successfully prepared at 130 C in one day using an ionic liquid assisted hydrothermal method using methoxyethyl methyl imidazolium methanesulfonate as the ionic liquid, titanium(IV) isopropoxide and tetrachloroaurate(III) trihydrate as precursors. Physico-chemical properties of the obtained photocatalysts were investigated via thorough characterizations. The framework substitution of Au in TiO2 NPs was established by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) techniques. X-ray diffraction (XRD) and transmission electron microscopy (TEM) image results confirmed the anatase phase and nanocrystalline nature of Au/TiO2. The optical properties revealed an extended tailing of the absorption edge toward the visible region upon Au doping. The concentration of Au in the TiO2 matrix has been fine-tuned to improve the hydrogen production, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) But there are no reports utilizing a single material for all three applications such as photocatalytic hydrogen production from water and photochemical as well as electrochemical reduction of Cr6+ to Cr3+. The synergy between the Au and TiO2 has an optimum for concentration of 0.5 wt% Au doped TiO2. The optimized product has produced promising hydrogen evolution of 3344 mmol g 1 under illumination with a visible light source in a water/ethanol system. The optimized product has shown promising electrocatalytic reduction and the photocatalytic detoxification ability of the material towards Cr6+ was explored. Amperometric studies showed a linear range from 0.1 to 2.7 mM, and limits of detection and quantification of 0.01 mM and 0.023 mM, respectively. The Au/TiO2 nanoparticle modified glassy carbon has been used for electrochemical monitoring of Cr6+ in natural water samples. The material also showed better photochemical reduction of Cr6+ in sunlight compared to UV light.application/pdfengRSC Advances. Cambridge. Vol. 7, no. 68 (2017), p. 43233-43244Produção de hidrogênioFotocatáliseLíquidos iônicosNanopartículasIonic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+)Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL001052393.pdf001052393.pdfTexto completo (inglês)application/pdf4930201http://www.lume.ufrgs.br/bitstream/10183/170604/1/001052393.pdfbe38979fbdf23e5d541f75d7308fc278MD51TEXT001052393.pdf.txt001052393.pdf.txtExtracted Texttext/plain46342http://www.lume.ufrgs.br/bitstream/10183/170604/2/001052393.pdf.txt070fdd9b8ba992d5de4a9571f90905d1MD5210183/1706042019-12-28 05:00:02.291352oai:www.lume.ufrgs.br:10183/170604Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2019-12-28T07:00:02Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
title |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
spellingShingle |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) Ravishankar, Thammadihalli Nanjundaiah Produção de hidrogênio Fotocatálise Líquidos iônicos Nanopartículas |
title_short |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
title_full |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
title_fullStr |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
title_full_unstemmed |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
title_sort |
Ionic liquid assisted hydrothermal syntheses of Au doped TiO2 NPs for efficient visible-light photocatalytic hydrogen production from water, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) |
author |
Ravishankar, Thammadihalli Nanjundaiah |
author_facet |
Ravishankar, Thammadihalli Nanjundaiah Vaz, Maurício de Oliveira Ramakrishnappa, Thippeswamy Teixeira, Sergio Ribeiro Dupont, Jairton |
author_role |
author |
author2 |
Vaz, Maurício de Oliveira Ramakrishnappa, Thippeswamy Teixeira, Sergio Ribeiro Dupont, Jairton |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Ravishankar, Thammadihalli Nanjundaiah Vaz, Maurício de Oliveira Ramakrishnappa, Thippeswamy Teixeira, Sergio Ribeiro Dupont, Jairton |
dc.subject.por.fl_str_mv |
Produção de hidrogênio Fotocatálise Líquidos iônicos Nanopartículas |
topic |
Produção de hidrogênio Fotocatálise Líquidos iônicos Nanopartículas |
description |
Au/TiO2 NPs have been successfully prepared at 130 C in one day using an ionic liquid assisted hydrothermal method using methoxyethyl methyl imidazolium methanesulfonate as the ionic liquid, titanium(IV) isopropoxide and tetrachloroaurate(III) trihydrate as precursors. Physico-chemical properties of the obtained photocatalysts were investigated via thorough characterizations. The framework substitution of Au in TiO2 NPs was established by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) techniques. X-ray diffraction (XRD) and transmission electron microscopy (TEM) image results confirmed the anatase phase and nanocrystalline nature of Au/TiO2. The optical properties revealed an extended tailing of the absorption edge toward the visible region upon Au doping. The concentration of Au in the TiO2 matrix has been fine-tuned to improve the hydrogen production, electrochemical detection and photochemical detoxification of hexavalent chromium (Cr6+) But there are no reports utilizing a single material for all three applications such as photocatalytic hydrogen production from water and photochemical as well as electrochemical reduction of Cr6+ to Cr3+. The synergy between the Au and TiO2 has an optimum for concentration of 0.5 wt% Au doped TiO2. The optimized product has produced promising hydrogen evolution of 3344 mmol g 1 under illumination with a visible light source in a water/ethanol system. The optimized product has shown promising electrocatalytic reduction and the photocatalytic detoxification ability of the material towards Cr6+ was explored. Amperometric studies showed a linear range from 0.1 to 2.7 mM, and limits of detection and quantification of 0.01 mM and 0.023 mM, respectively. The Au/TiO2 nanoparticle modified glassy carbon has been used for electrochemical monitoring of Cr6+ in natural water samples. The material also showed better photochemical reduction of Cr6+ in sunlight compared to UV light. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-11-28T02:29:12Z |
dc.date.issued.fl_str_mv |
2017 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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article |
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http://hdl.handle.net/10183/170604 |
dc.identifier.issn.pt_BR.fl_str_mv |
2046-2069 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001052393 |
identifier_str_mv |
2046-2069 001052393 |
url |
http://hdl.handle.net/10183/170604 |
dc.language.iso.fl_str_mv |
eng |
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eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
RSC Advances. Cambridge. Vol. 7, no. 68 (2017), p. 43233-43244 |
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