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Title: Titania-lanthanum phosphate photoactive and hydrophobic new generation catalyst

Abstract

Titania-lanthanum phosphate nanocomposites with multifunctional properties have been synthesized by aqueous sol-gel method. The precursor sols with varying TiO{sub 2}:LaPO{sub 4} ratios were applied as thin coating on glass substrates in order to be transparent, hydrophobic, photocatalytically active coatings. The phase compositions of the composite powders were identified by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM). The anatase phase of TiO{sub 2} in TiO{sub 2}-LaPO{sub 4} composite precursors was found to be stable even on annealing at 800 deg. C. The glass substrates, coated with TL1 (TiO{sub 2}-LaPO{sub 4} composition with 1 mol% LaPO{sub 4}) and TL50 (composite precursor containing TiO{sub 2} and LaPO{sub 4} with molar ratio 1:1) sols and annealed at 400 deg. C, produced contact angles of 74 deg. and 92 deg., respectively, though it is only 62 deg. for pure TiO{sub 2} coating. The glass substrates, coated with TL50 sol, produced surfaces with relatively high roughness and uneven morphology. The TL1 material, annealed at 800 deg. C, has shown the highest UV photoactivity with an apparent rate constant, k{sub app}=24x10{sup -3} min{sup -1}, which is over five times higher than that observed with standard Hombikat UV 100 (k{sub app}=4x10{sup -3} min{sup -1}). Themore » photoactivity combined with a moderate contact angle (85.3 deg.) shows that this material has a promise as an efficient self-cleaning precursor. - Graphical abstract: Multifunctional TiO{sub 2}-LaPO{sub 4} composite stabilizes anatase phase with enhanced photocatalytic activity, and moderately higher hydrophobicity is a promising material for self-cleaning application. Highlights: > Titania-lanthanum phosphate nanocomposites were synthesized by aqueous sol-gel method. > Transparent, hydrophobic, photoactive coatings were developed on glass substrates. > The glass substrates, coated with TL1 annealed at 400 deg. C, produced a contact angle of 74 deg. > The TL1 material at 800 deg. C has shown the highest UV photoactivity (k{sub app}=24x10{sup -3} min{sup -1}). > Photoactivity and moderate contact angle show that this is an efficient self-cleaning precursor.« less

Authors:
;  [1];  [1]; ;  [1];  [1]
  1. National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum 695019 (India)
Publication Date:
OSTI Identifier:
21580164
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2011.05.020; PII: S0022-4596(11)00269-6; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; COMPOSITE MATERIALS; GLASS; LANTHANUM PHOSPHATES; MORPHOLOGY; NANOSTRUCTURES; PHOTOCATALYSIS; PRECURSOR; REACTION KINETICS; SOL-GEL PROCESS; SOLS; SUBSTRATES; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; CATALYSIS; CHALCOGENIDES; COHERENT SCATTERING; COLLOIDS; DIFFRACTION; DISPERSIONS; ELECTRON MICROSCOPY; HEAT TREATMENTS; KINETICS; LANTHANUM COMPOUNDS; MATERIALS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; RARE EARTH COMPOUNDS; SCATTERING; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Citation Formats

Jyothi, Chembolli K., Jaimy, Kanakkanmavudi B., Ghosh, Swapankumar, E-mail: swapankumar.ghosh2@mail.dcu.ie, Sankar, Sasidharan, Smitha, V.S., and Warrier, K.G.K., E-mail: wwarrierkgk@yahoo.co.in. Titania-lanthanum phosphate photoactive and hydrophobic new generation catalyst. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.05.020.
Jyothi, Chembolli K., Jaimy, Kanakkanmavudi B., Ghosh, Swapankumar, E-mail: swapankumar.ghosh2@mail.dcu.ie, Sankar, Sasidharan, Smitha, V.S., & Warrier, K.G.K., E-mail: wwarrierkgk@yahoo.co.in. Titania-lanthanum phosphate photoactive and hydrophobic new generation catalyst. United States. doi:10.1016/j.jssc.2011.05.020.
Jyothi, Chembolli K., Jaimy, Kanakkanmavudi B., Ghosh, Swapankumar, E-mail: swapankumar.ghosh2@mail.dcu.ie, Sankar, Sasidharan, Smitha, V.S., and Warrier, K.G.K., E-mail: wwarrierkgk@yahoo.co.in. Fri . "Titania-lanthanum phosphate photoactive and hydrophobic new generation catalyst". United States. doi:10.1016/j.jssc.2011.05.020.
@article{osti_21580164,
title = {Titania-lanthanum phosphate photoactive and hydrophobic new generation catalyst},
author = {Jyothi, Chembolli K. and Jaimy, Kanakkanmavudi B. and Ghosh, Swapankumar, E-mail: swapankumar.ghosh2@mail.dcu.ie and Sankar, Sasidharan and Smitha, V.S. and Warrier, K.G.K., E-mail: wwarrierkgk@yahoo.co.in},
abstractNote = {Titania-lanthanum phosphate nanocomposites with multifunctional properties have been synthesized by aqueous sol-gel method. The precursor sols with varying TiO{sub 2}:LaPO{sub 4} ratios were applied as thin coating on glass substrates in order to be transparent, hydrophobic, photocatalytically active coatings. The phase compositions of the composite powders were identified by powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM). The anatase phase of TiO{sub 2} in TiO{sub 2}-LaPO{sub 4} composite precursors was found to be stable even on annealing at 800 deg. C. The glass substrates, coated with TL1 (TiO{sub 2}-LaPO{sub 4} composition with 1 mol% LaPO{sub 4}) and TL50 (composite precursor containing TiO{sub 2} and LaPO{sub 4} with molar ratio 1:1) sols and annealed at 400 deg. C, produced contact angles of 74 deg. and 92 deg., respectively, though it is only 62 deg. for pure TiO{sub 2} coating. The glass substrates, coated with TL50 sol, produced surfaces with relatively high roughness and uneven morphology. The TL1 material, annealed at 800 deg. C, has shown the highest UV photoactivity with an apparent rate constant, k{sub app}=24x10{sup -3} min{sup -1}, which is over five times higher than that observed with standard Hombikat UV 100 (k{sub app}=4x10{sup -3} min{sup -1}). The photoactivity combined with a moderate contact angle (85.3 deg.) shows that this material has a promise as an efficient self-cleaning precursor. - Graphical abstract: Multifunctional TiO{sub 2}-LaPO{sub 4} composite stabilizes anatase phase with enhanced photocatalytic activity, and moderately higher hydrophobicity is a promising material for self-cleaning application. Highlights: > Titania-lanthanum phosphate nanocomposites were synthesized by aqueous sol-gel method. > Transparent, hydrophobic, photoactive coatings were developed on glass substrates. > The glass substrates, coated with TL1 annealed at 400 deg. C, produced a contact angle of 74 deg. > The TL1 material at 800 deg. C has shown the highest UV photoactivity (k{sub app}=24x10{sup -3} min{sup -1}). > Photoactivity and moderate contact angle show that this is an efficient self-cleaning precursor.},
doi = {10.1016/j.jssc.2011.05.020},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 184,
place = {United States},
year = {2011},
month = {7}
}