Accepted Manuscript Synthesis and photocatlytic activities of CdS/TiO2 nanoparticles supported on carbon nanofibers for high efficient adsorption and simultaneous decomposition of organic dyes Bishweshwar Pant, Nasser A.M. Barakat, Hem Raj Pant, Mira Park, Prem Singh Saud, Jong-Wan Kim, Hak-Yong Kim PII: DOI: Reference:
S0021-9797(14)00537-2 http://dx.doi.org/10.1016/j.jcis.2014.07.039 YJCIS 19724
To appear in:
Journal of Colloid and Interface Science
Received Date: Accepted Date:
10 March 2014 25 July 2014
Please cite this article as: B. Pant, N.A.M. Barakat, H.R. Pant, M. Park, P.S. Saud, J-W. Kim, H-Y. Kim, Synthesis and photocatlytic activities of CdS/TiO2 nanoparticles supported on carbon nanofibers for high efficient adsorption and simultaneous decomposition of organic dyes, Journal of Colloid and Interface Science (2014), doi: http:// dx.doi.org/10.1016/j.jcis.2014.07.039
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Synthesis and photocatlytic activities of CdS/TiO2 nanoparticles supported on carbon nanofibers for high efficient adsorption and simultaneous decomposition of organic dyes Bishweshwar Pant1, Nasser A.M. Barakat2, Hem Raj Pant3, 4, Mira Park2, Prem Singh Saud1, Jong-Wan Kim1, Hak-Yong Kim2* 1
Department of BIN Fusion Technology, Chonbuk National University, Jeonju 561756, Republic of Korea
2
Department of Organic Materials and fiber Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
3
Bio-nano system Engineering Department, Chonbuk National University, Jeonju 561756, Republic of Korea 5
Department of Engineering Science and Humanities, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Kathmandu, Nepal
*Corresponding author Hak-Yong Kim E-mail: [email protected]
1
Abstract CdS/TiO2 NPs-decorated carbon nanofibers were prepared by a simple electrospinning method followed by the calcination under argon atmosphere. Assynthesized
nanocomposites
exhibited
a
strong
photocatalytic
activity
for
decomposition of methylene blue (MB), reactive black 5, and reactive orange 16 under visible light radiation for many successive cycles. Moreover, in the dark, the carbon content revealed very good adsorption behavior as 95 % of the dye was removed within 5 min, however less adsorption capacity was observed upon successive cycles. Therefore, the enhanced photocatalytic performance for the introduced nanofibers might be attributed to the adsorption characteristic of carbon nanofiber and the known photocatalytic activities of the TiO2 and CdS photocatalysts.
Key words: Electrospinning; Photocatalysis; Cadmium sulfide; Titanium dioxide; Carbon nanofiber
2
1. Introduction With global concern about the presence of organic pollutants and toxic materials in water and environmental issues, the development of effective materials for water purification system is of great significance. For the removal of dye pollutants, semiconductor metal oxides, such as TiO2, ZnO, ZnS, CdS and Fe2O3 nanoparticles (NPs), have thus far been shown to be the most promising materials in this field [1]. Among these semiconductor metal oxides, TiO2 has been recognized as an excellent material for the photodegradation of environmental organic pollutants and toxics because of its excellent electronic, chemical, and optical properties with high photosensitivity and non toxicity. For the effective decomposition of organic compounds in air and water, TiO2 is most widely used under irradiation of UV light with wavelength shorter than that corresponding to its band gap [2, 3]. However, only about 3-5 % of the solar spectrum falls in this UV range. This limits the efficient utilization of solar energy for TiO2. To improve the response of TiO2 to visible light, transition metal [4-6] or non-metal atom [7] doped TiO2 and dye [8] or metal complex [9] sensitized TiO2 have been developed. TiO2 sensitized with CdS shows a high efficiency for photocatalytic degradation of pollutants [10]. By its relatively narrow band gap (2.4 eV), it can absorb visible light
3
at wavelengths of
S0021-9797(14)00537-2 http://dx.doi.org/10.1016/j.jcis.2014.07.039 YJCIS 19724
To appear in:
Journal of Colloid and Interface Science
Received Date: Accepted Date:
10 March 2014 25 July 2014
Please cite this article as: B. Pant, N.A.M. Barakat, H.R. Pant, M. Park, P.S. Saud, J-W. Kim, H-Y. Kim, Synthesis and photocatlytic activities of CdS/TiO2 nanoparticles supported on carbon nanofibers for high efficient adsorption and simultaneous decomposition of organic dyes, Journal of Colloid and Interface Science (2014), doi: http:// dx.doi.org/10.1016/j.jcis.2014.07.039
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Synthesis and photocatlytic activities of CdS/TiO2 nanoparticles supported on carbon nanofibers for high efficient adsorption and simultaneous decomposition of organic dyes Bishweshwar Pant1, Nasser A.M. Barakat2, Hem Raj Pant3, 4, Mira Park2, Prem Singh Saud1, Jong-Wan Kim1, Hak-Yong Kim2* 1
Department of BIN Fusion Technology, Chonbuk National University, Jeonju 561756, Republic of Korea
2
Department of Organic Materials and fiber Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea
3
Bio-nano system Engineering Department, Chonbuk National University, Jeonju 561756, Republic of Korea 5
Department of Engineering Science and Humanities, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Kathmandu, Nepal
*Corresponding author Hak-Yong Kim E-mail: [email protected]
1
Abstract CdS/TiO2 NPs-decorated carbon nanofibers were prepared by a simple electrospinning method followed by the calcination under argon atmosphere. Assynthesized
nanocomposites
exhibited
a
strong
photocatalytic
activity
for
decomposition of methylene blue (MB), reactive black 5, and reactive orange 16 under visible light radiation for many successive cycles. Moreover, in the dark, the carbon content revealed very good adsorption behavior as 95 % of the dye was removed within 5 min, however less adsorption capacity was observed upon successive cycles. Therefore, the enhanced photocatalytic performance for the introduced nanofibers might be attributed to the adsorption characteristic of carbon nanofiber and the known photocatalytic activities of the TiO2 and CdS photocatalysts.
Key words: Electrospinning; Photocatalysis; Cadmium sulfide; Titanium dioxide; Carbon nanofiber
2
1. Introduction With global concern about the presence of organic pollutants and toxic materials in water and environmental issues, the development of effective materials for water purification system is of great significance. For the removal of dye pollutants, semiconductor metal oxides, such as TiO2, ZnO, ZnS, CdS and Fe2O3 nanoparticles (NPs), have thus far been shown to be the most promising materials in this field [1]. Among these semiconductor metal oxides, TiO2 has been recognized as an excellent material for the photodegradation of environmental organic pollutants and toxics because of its excellent electronic, chemical, and optical properties with high photosensitivity and non toxicity. For the effective decomposition of organic compounds in air and water, TiO2 is most widely used under irradiation of UV light with wavelength shorter than that corresponding to its band gap [2, 3]. However, only about 3-5 % of the solar spectrum falls in this UV range. This limits the efficient utilization of solar energy for TiO2. To improve the response of TiO2 to visible light, transition metal [4-6] or non-metal atom [7] doped TiO2 and dye [8] or metal complex [9] sensitized TiO2 have been developed. TiO2 sensitized with CdS shows a high efficiency for photocatalytic degradation of pollutants [10]. By its relatively narrow band gap (2.4 eV), it can absorb visible light
3
at wavelengths of
