Visible-light photocatalysis in Ca0.6Ho0 .4MnO3 films deposited by rf-magnetron sputtering using nanosized powder compacted target

B. Barrocas; S. Sério; A. Rovisco; M. E. Melo Jorge

doi:10.1021/jp412016a

Visible-light photocatalysis in Ca_0.6Ho₀ _.4MnO₃ films deposited by rf-magnetron sputtering using nanosized powder compacted target

B. Barrocas, S. Sério, A. Rovisco, M. E. Melo Jorge

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

A novel immobilized Ca_0.6Ho_0.4MnO₃ photocatalyst has been developed with high photocatalytic activity for Rhodamine 6G (Rh6G) photodegradation under visible light irradiation. The nanocrystalline Ca_0.6Ho_0.4MnO₃ films were successfully deposited by RF-magnetron sputtering on unheated quartz glass substrates using Ca_0.6Ho_0.4MnO₃ powder as sputtering target and its photocatalytic functionalities have been explored. The visible-light- responsive photocatalytic activity of Ca_0.6Ho_0.4MnO ₃ films was evaluated by the photodegradation of Rh6G aqueous solutions under visible light irradiation. The reusability of Ca _0.6Ho_0.4MnO₃ films on fresh dye samples was studied, showing an efficient reuse, without decreasing the photocatalytic decolorization efficiency. Furthermore, X-ray diffraction of the reused films did not reveal additional phases indicating high photochemical stability of the films even after reusing them in successive runs. The photocatalytic efficiency of the nanocrystalline Ca_0.6Ho_0.4MnO₃ films was further compared with TiO₂ films also produced by sputtering and the results revealed a significant improvement in photocatalytic activity over TiO₂ under visible light irradiation. Almost complete photodecolorization of a 5 ppm Rh6G solution was achieved in 4 h, while only 64% of dye degradation was observed in TiO₂ photoassisted process. This work provides a feasible route to fabricate high-performance immobilized ABO₃-based nanomaterials, and the finding opens up a new venue for designing visible light sensitive ternary compounds for photocatalytical applications.

Original language	English
Pages (from-to)	590-597
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	1
DOIs	https://doi.org/10.1021/jp412016a
Publication status	Published - 9 Jan 2014

Keywords

METAL-INSULATOR-TRANSITION
SURFACE SCIENCE
ANATASE TIO2
DOPED TIO2
NANOCOMPOSITES
NANOPARTICLES

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@article{f3637e9d93cc45b8b7e17b96c53f89d6,

title = "Visible-light photocatalysis in Ca0.6Ho0 .4MnO3 films deposited by rf-magnetron sputtering using nanosized powder compacted target",

abstract = "A novel immobilized Ca0.6Ho0.4MnO3 photocatalyst has been developed with high photocatalytic activity for Rhodamine 6G (Rh6G) photodegradation under visible light irradiation. The nanocrystalline Ca0.6Ho0.4MnO3 films were successfully deposited by RF-magnetron sputtering on unheated quartz glass substrates using Ca0.6Ho0.4MnO3 powder as sputtering target and its photocatalytic functionalities have been explored. The visible-light- responsive photocatalytic activity of Ca0.6Ho0.4MnO 3 films was evaluated by the photodegradation of Rh6G aqueous solutions under visible light irradiation. The reusability of Ca 0.6Ho0.4MnO3 films on fresh dye samples was studied, showing an efficient reuse, without decreasing the photocatalytic decolorization efficiency. Furthermore, X-ray diffraction of the reused films did not reveal additional phases indicating high photochemical stability of the films even after reusing them in successive runs. The photocatalytic efficiency of the nanocrystalline Ca0.6Ho0.4MnO3 films was further compared with TiO2 films also produced by sputtering and the results revealed a significant improvement in photocatalytic activity over TiO2 under visible light irradiation. Almost complete photodecolorization of a 5 ppm Rh6G solution was achieved in 4 h, while only 64% of dye degradation was observed in TiO2 photoassisted process. This work provides a feasible route to fabricate high-performance immobilized ABO3-based nanomaterials, and the finding opens up a new venue for designing visible light sensitive ternary compounds for photocatalytical applications.",

keywords = "METAL-INSULATOR-TRANSITION, SURFACE SCIENCE, ANATASE TIO2, DOPED TIO2, NANOCOMPOSITES, NANOPARTICLES",

author = "B. Barrocas and S. S{\'e}rio and A. Rovisco and {Melo Jorge}, {M. E.}",

note = "sem pdf conforme despacho. Financial support from FEDER, through Programa Operacional Factores de Competitividade - COMPETE, and Fundacao para a Ciencia e a Tecnologia - FCT, for the project PTDC/AAC-AMB/103112/2008. This work was also supported by FCT, through the projects PEst-OE/FIS/UI0068/2011 and PEst-OE/QUI/UI0536/2011. S. Serio thanks FCT for the Programme Ciencia 2007. ",

year = "2014",

month = jan,

day = "9",

doi = "10.1021/jp412016a",

language = "English",

volume = "118",

pages = "590--597",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "ACS - American Chemical Society",

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AU - Barrocas, B.

AU - Sério, S.

AU - Rovisco, A.

AU - Melo Jorge, M. E.

N1 - sem pdf conforme despacho. Financial support from FEDER, through Programa Operacional Factores de Competitividade - COMPETE, and Fundacao para a Ciencia e a Tecnologia - FCT, for the project PTDC/AAC-AMB/103112/2008. This work was also supported by FCT, through the projects PEst-OE/FIS/UI0068/2011 and PEst-OE/QUI/UI0536/2011. S. Serio thanks FCT for the Programme Ciencia 2007.

PY - 2014/1/9

Y1 - 2014/1/9

N2 - A novel immobilized Ca0.6Ho0.4MnO3 photocatalyst has been developed with high photocatalytic activity for Rhodamine 6G (Rh6G) photodegradation under visible light irradiation. The nanocrystalline Ca0.6Ho0.4MnO3 films were successfully deposited by RF-magnetron sputtering on unheated quartz glass substrates using Ca0.6Ho0.4MnO3 powder as sputtering target and its photocatalytic functionalities have been explored. The visible-light- responsive photocatalytic activity of Ca0.6Ho0.4MnO 3 films was evaluated by the photodegradation of Rh6G aqueous solutions under visible light irradiation. The reusability of Ca 0.6Ho0.4MnO3 films on fresh dye samples was studied, showing an efficient reuse, without decreasing the photocatalytic decolorization efficiency. Furthermore, X-ray diffraction of the reused films did not reveal additional phases indicating high photochemical stability of the films even after reusing them in successive runs. The photocatalytic efficiency of the nanocrystalline Ca0.6Ho0.4MnO3 films was further compared with TiO2 films also produced by sputtering and the results revealed a significant improvement in photocatalytic activity over TiO2 under visible light irradiation. Almost complete photodecolorization of a 5 ppm Rh6G solution was achieved in 4 h, while only 64% of dye degradation was observed in TiO2 photoassisted process. This work provides a feasible route to fabricate high-performance immobilized ABO3-based nanomaterials, and the finding opens up a new venue for designing visible light sensitive ternary compounds for photocatalytical applications.

AB - A novel immobilized Ca0.6Ho0.4MnO3 photocatalyst has been developed with high photocatalytic activity for Rhodamine 6G (Rh6G) photodegradation under visible light irradiation. The nanocrystalline Ca0.6Ho0.4MnO3 films were successfully deposited by RF-magnetron sputtering on unheated quartz glass substrates using Ca0.6Ho0.4MnO3 powder as sputtering target and its photocatalytic functionalities have been explored. The visible-light- responsive photocatalytic activity of Ca0.6Ho0.4MnO 3 films was evaluated by the photodegradation of Rh6G aqueous solutions under visible light irradiation. The reusability of Ca 0.6Ho0.4MnO3 films on fresh dye samples was studied, showing an efficient reuse, without decreasing the photocatalytic decolorization efficiency. Furthermore, X-ray diffraction of the reused films did not reveal additional phases indicating high photochemical stability of the films even after reusing them in successive runs. The photocatalytic efficiency of the nanocrystalline Ca0.6Ho0.4MnO3 films was further compared with TiO2 films also produced by sputtering and the results revealed a significant improvement in photocatalytic activity over TiO2 under visible light irradiation. Almost complete photodecolorization of a 5 ppm Rh6G solution was achieved in 4 h, while only 64% of dye degradation was observed in TiO2 photoassisted process. This work provides a feasible route to fabricate high-performance immobilized ABO3-based nanomaterials, and the finding opens up a new venue for designing visible light sensitive ternary compounds for photocatalytical applications.

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IS - 1

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Visible-light photocatalysis in Ca_0.6Ho₀ _.4MnO₃ films deposited by rf-magnetron sputtering using nanosized powder compacted target

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