scholarly journals Enhanced photocatalytic bacterial inactivation of atomic-layer deposited anatase-TiO2 thin films on rutile-TiO2 nanotubes

2020 ◽  
Vol 19 (3) ◽  
pp. 399-405
Author(s):  
Joel Molina-Reyes ◽  
Alejandra Romero-Morán ◽  
José L. Sánchez-Salas
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Tio2 Nanotubes ◽  
Considerable Increase ◽  
Atomic Layer ◽  
Surface Modifications ◽  
Anatase Tio2 ◽  
Bacterial Inactivation ◽  
Tio2 Thin Films ◽  
Experimental Conditions

Experimental conditions to fabricate rutile-TiO2 nanotubes coated with a conformal anatase-TiO2 thin layer using ALD were reported. A considerable increase in the photocatalytic activity associated with these surface modifications was also observed.

Photoluminescence and photocatalytic activity of spin coated Ag+ doped anatase TiO2 thin films

2020 ◽  
Vol 108 ◽  
pp. 110401 ◽  
Author(s):  
D. Komaraiah ◽  
E. Radha ◽  
J. Sivakumar ◽  
M.V. Ramana Reddy ◽  
R. Sayanna
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Tio2 Thin Films

Grain size effect on photocatalytic activity of TiO2 thin films grown by atomic layer deposition

2020 ◽  
Vol 709 ◽  
pp. 138215
Author(s):  
Ivana Jelovica Badovinac ◽  
Robert Peter ◽  
Aleš Omerzu ◽  
Krešimir Salamon ◽  
Iva Šarić ◽  
...  
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Size Effect ◽  
Atomic Layer ◽  
Grain Size Effect ◽  
Tio2 Thin Films ◽  
Layer Deposition

scholarly journals Quantitative relation between photocatalytic activity and degree of 〈001〉 orientation for anatase TiO2 thin films

2015 ◽  
Vol 3 (33) ◽  
pp. 17369-17375 ◽  
Author(s):  
Bozhidar I. Stefanov ◽  
Gunnar A. Niklasson ◽  
Claes G. Granqvist ◽  
Lars Österlund
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Magnetron Sputtering ◽  
Quantitative Relationship ◽  
Anatase Tio2 ◽  
Quantitative Relation ◽  
Nanocrystalline Films ◽  
Dc Magnetron Sputtering ◽  
Crystal Surfaces ◽  
Tio2 Thin Films

We demonstrate a quantitative relationship between exposed (001) crystal surfaces and photocatalytic activity of nanocrystalline films prepared by DC magnetron sputtering that follow a square dependence.

Photocatalytic degradation of methylene blue from aqueous solutions using nanopillars-TiO2 thin films: Batch reactor studies

2018 ◽  
Vol 18 (3) ◽  
pp. 81-91 ◽  
Author(s):  
C. Lalhriatpuia
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

Nanopillars-TiO2 thin films was obtained on a borosilicate glass substrate with (S1) and without (S2) polyethylene glycol as template. The photocatalytic behaviour of S1 and S2 thin films was assessed inthe degradation of methylene blue (MB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the SEM, XRD, FTIR and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data confirmed that the TiO2 particles are in its anatase mineral phase. The SEM and AFM images indicated the catalyst is composed with nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of MB was well studied at wide range of physico-chemical parameters. The effect of solution pH (pH 4.0 to 10.0) and MB initial concentration (1.0 to 10.0 mg/L) was extensively studied and the effect of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of MB was demonstrated. The maximum percent removal of MB was observed at pH 8.0 beyond which it started decreasing and a low initial concentration of the pollutant highly favoured the photocatalytic degradation using thin films and the presence of several interfering ions diminished the photocatalytic activity of thin films to some extent. The overall photocatalytic activity was in the order: S2 > S1 > UV. The photocatalytic degradation of MB was followed the pseudo-first-order rate kinetics. The mineralization of MB was studied with total organic carbon measurement using the TOC (total organic carbon) analysis.

STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

2019 ◽  
Vol 7 (1) ◽  
pp. 28
Author(s):  
KOMARAIAH DURGAM ◽  
RADHA EPPA ◽  
REDDY M. V. RAMANA ◽  
KUMAR J. SIVA ◽  
R. SAYANNA ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
Spin Coating ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Nanocrystalline Tio2

Use of Nanopillars-TiO2 Thin Films in the Photocatalytic Degradation of Bromophenol Blue from Aqueous Solution

2018 ◽  
Vol 6 (1) ◽  
pp. 22-30
Author(s):  
C. Lalhriatpuia ◽  
◽  
Thanhming liana ◽  
K. Vanlaldinpuia
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Bromophenol Blue ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

The photocatalytic activity of Nanopillars-TiO2 thin films was assessed in the degradation of Bromophenol blue (BPB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data showed anatase phase of TiO2 particles with average particle size of 25.4 and 21.9 nm, for S1 and S2 catalysts respectively. The SEM and AFM images indicated the catalyst composed with Nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The average height of the pillars was found to be 180 and 40 nm respectively for the S1 and S2 catalyst. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of BPB using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well as the practical applicability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), BPB initial concentration (1.0 to 20.0 mg/L) and presence of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of BPB. The maximum percent removal of BPB was observed at pH 6.0 and a low initial concentration of the pollutant highly favours the photocatalytic degradation using thin films. The presence of several interfering ions suppressed the photocatalytic activity of thin films to some extent. The time dependence photocatalytic degradation of BPB was demonstrated with the pseudo-first-order rate kinetics. Study was further extended with total organic carbon measurement using the TOC (Total Organic Carbon) analysis. This demonstrated an apparent mineralization of BPB from aqueous solutions.

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