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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/4008
Title: Sunlight responsive new Sillén-Aurivillius A1X1 hybrid layered oxyhalides with enhanced photocatalytic activity
Authors: Pandey A.
Naresh G.
Mandal, Tapas Kumar
Published in: Solar Energy Materials and Solar Cells
Abstract: Synthesis of new semiconductors responsive under visible light/sunlight has been considered as an elegant strategy of photocatalyst development for efficient solar light harvesting applications. In the present study, new La-substituted layered Sillén-Aurivillius oxyhalide intergrowths, Bi 3 LaNbO 8 X (X=Cl, Br), have been prepared by solid state reaction. The compounds are characterized by powder X-ray diffraction (p-XRD), field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), UV–vis diffuse reflectance spectroscopy (UV–vis DRS), electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) studies. The P-XRD data revealed formation of Sillén-Aurivillius hybrid perovskites isostructural to the parent compounds, Bi 4 NbO 8 X (X = Cl, Br), and the FE-SEM-EDS confirmed the morphology to be agglomerates of submicron-sized particles with desired compositions as expected. The band gap for all the pristine oxyhalides lie in range 2.43–2.54 eV indicative of their sunlight active nature. The sunlight-driven photocatalytic activity studies through Rhodamine B (RhB) degradation unveiled excellent dye degradation efficiencies over Bi 3 LaNbO 8 Cl and Bi 3 LaNbO 8 Br in the acidic medium. The enhanced photocatalytic activities are attributed to superior charge carrier separation and dye adsorption in the La-substituted phases. Scavenger tests demonstrated the active role of hole and hydroxyl radical as key species in the RhB degradation under sunlight in presence of Bi 3 LaNbO 8 Br. The demonstration of enhanced activity under natural sunlight is significant in future development of environmental remediation technologies by harvesting solar energy. © 2016 Elsevier B.V.
Citation: Solar Energy Materials and Solar Cells (2017), 161(): 197-205
URI: https://doi.org/10.1016/j.solmat.2016.11.040
http://repository.iitr.ac.in/handle/123456789/4008
Issue Date: 2017
Publisher: Elsevier B.V.
Keywords: Dye degradation
Layered oxyhalides
Photocatalytic activity
Semiconductors
Sillén-Aurivillius
ISSN: 9270248
Author Scopus IDs: 57207244265
56449028900
57200780613
Author Affiliations: Pandey, A., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Naresh, G., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Mandal, T.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India, Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Funding Details: This work was financially supported by IIT Roorkee NO. IITR/SRIC/259/FIG(Scheme-A) through Faculty Initiation Grant A (FIG-A). A. P. and G. N. thank the Ministry of Human Resources and Development (MHRD), Government of India for research fellowships. The authors are thankful to the Institute Instrumentation Centre, IIT Roorkee for providing the facilities.
Corresponding Author: Mandal, T.K.; Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email: tapasfcy@iitr.ac.in
Appears in Collections:Journal Publications [CY]

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