Characterization and Photocatalytic Activity of Nano-TiO2 Doped with Iron and Niobium for Turquoise Blue Dye Removal

The nano-TiO2 photocatalysts doped with Iron and Niobium for dye wastewater treatment were prepared by temperature-controlled sol-gel method. The effects of these dopants on the physical and chemical properties of TiO2 were compared with the commercially available Degussa TiO2 P25. Among these characteristics are crystalline size, the presence of absolute anatase phase, band gap energy and specific surface area. The characterization data were correlated to photocatalytic activities using Turquoise blue dye (TBD) as model pollutant. Single doping (with Nb) and co-doping (Fe and Nb) catalyst reached complete decolorization within 2.5 hours and 3 hours. In addition, their kinetic reaction rate constants of apparent first-order model are 0.0258 min-1 and 0.0225 min-1, respectively. The presence of Nb as traps is considered to play a crucial key in enhancing the photocatalytic activity.

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Correlation of fluorescence and photocatalytic activity of Co-doped TiO2

Malaysian Journal of Fundamental and Applied Sciences ◽

10.11113/mjfas.v11n3.382 ◽

2015 ◽

Vol 11 (3) ◽

Author(s):

Koh Pei Wen ◽

Leny Yuliati ◽

Lee Siew Ling

Keyword(s):

Photocatalytic Activity ◽

Sol Gel ◽

Chemical Properties ◽

Rutile Phase ◽

Band Gap Energy ◽

Electron Hole ◽

Doped Tio2 ◽

Physical And Chemical ◽

Hole Recombination ◽

Co Doped

Co-doped TiO2 (0.5-4 mol%) photocatalysts were synthesized via sol-gel method and their physical and chemical properties were investigated. Addition of Co oxide dopant induced anatase to rutile phase transition and reduced the band gap energy of TiO2. The fluorescence result indicated that the electron-hole recombination rate was reduced with the presence of Co oxide dopant. The best photocatalyst obtained was 3Co-TiO2 which enhanced the photocatalytic activity of TiO2 by 12 folds to 26.6%. The importance of fluorescence properties of Co-doped TiO2 towards its photodegradation of Congo Red was presented.

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Photocatalytic Properties of Nitrogen-Sulfur Co-Doped TiO2 Films Coated on Glass Fiber

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.781-784.2237 ◽

2013 ◽

Vol 781-784 ◽

pp. 2237-2240 ◽

Cited By ~ 1

Author(s):

Benjamas Noophum ◽

Lek Sikong ◽

Kalayanee Kooptanond

Keyword(s):

Photocatalytic Activity ◽

Glass Fibers ◽

Sol Gel ◽

Dip Coating ◽

Band Gap Energy ◽

Fluorescent Light ◽

Co Doping ◽

Light Region ◽

Microstructure Morphology ◽

Co Doped

The photocatalytic N-S co-doped TiO2films coated on glass fibers were successfully prepared by sol-gel, dip-coating and calcination methods. The effect of doping concentration on crystalline size, microstructure, morphology, optical property and photocatalytic activity was investigated. The films were characterized by XRD, SEM, EDS, UV-vis DRS and FT-IR. The photocatalytic activity was evaluated by the degradation of methylene blue (MB). N-S co-doping has an effect on light adsorption wavelength shifted to visible light region which can lower the band gap energy of N-S co-doped due to the replacement of O atom in TiO2by N and S atoms to form Ti-O-N and Ti-O-S structures. Thiourea, a source of nitrogen and sulfur could increase viscosity of sol used for coating on glass fibers, resulting in larger particles size and more surface roughness of the doped films.TiO2films with 5 mol% N-S co-doped showed an excellent photocatalytic performance under fluorescent light irradiation.

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Synthesis and Characterization of SnO2/N-Doped TiO2 Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.488-489.22 ◽

2012 ◽

Vol 488-489 ◽

pp. 22-26

Author(s):

Lek Sikong ◽

H. Panritdam ◽

Juntima Chungsiriporn ◽

S. Te-Chato

Keyword(s):

Photocatalytic Activity ◽

Crystallite Size ◽

Anatase Phase ◽

Sol Gel ◽

Band Gap Energy ◽

High Photocatalytic Activity ◽

Gap Energy ◽

Xrd Patterns ◽

Tin Tetrachloride

SnO2/N – doped TiO2photocatalysts were prepared by the modified sol-gel method. Tin tetrachloride pentahydrate, urea and polyethylene glycol were used as precursors and calcined at a temperature of 500 °C for 2 h for making powders. Different interstitial amount of nitrogen additives were in range of 0 to 40 mol%N. The XRD patterns show the TiO2nanocomposites are anatase phase. It was also apparent that doped nitrogen has an effect on crystallite size and band gap energy on absorbed light wavelength leading of enhancement of photocatalytic activity of TiO2composite nanoparticles. The result showed 20 mol%N of TiO2nanocomposites exhibited high photocatalytic activity, redshift in adsorption edge and a small crystallite size.

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Photocatalytic activity of Al/Ni-doped TiO2 films synthesized by sol-gel method: Effect of sunlight photocatalysis on the catalysts properties

10.21203/rs.3.rs-211595/v1 ◽

2021 ◽

Author(s):

Elhachmi Guettaf Temam ◽

Faiçal Djani ◽

Saad Rahmane ◽

Hachemi Ben Temam ◽

Brahim Gasmi

Keyword(s):

Thin Films ◽

Photocatalytic Activity ◽

Dye Degradation ◽

Anatase Phase ◽

High Surface ◽

Sol Gel ◽

Dip Coating ◽

Blue Dye ◽

Tio2 Films ◽

Doped Tio2

Abstract Photocatalytic activity of semiconductors is affected by the nature of metal dopant. To study the effect of non-transition and transition metal on the physical and optical properties of TiO2 based photocatalysts; Al and Ni-doped TiO2 thin films respectively were prepared via a sol-gel dip-coating method. The effect of the photocatalysis process on the properties of TiO2 based thin films was investigated. The photocatalytic activity was calculated from methylene blue dye degradation under sunlight irradiation. XRD results show that un-doped TiO2 films were grown with anatase phase, whereas, the Ni and Ni/Al-doped TiO2 films show Ti4O7 single phase. The presence of Al preferred the rutile phase. No phases related to NiO or Al2O3 were detected. Ni-TiO2 photocatalyst shows high photocatalytic activity (~ 93%) thanks to the high content of O and Ti, wide bandgap (3.35 eV), low crystal size (6.87 nm), high film thickness (288 nm), and high surface roughness (44.5 nm). After photocatalysis, all the films show a decrease in O content and thickness, whereas the indirect bandgap values were increased which suggesting the reuse with low photocatalytic activity.

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Cu Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity and High Temperature Anatase Stability

10.26434/chemrxiv.7159733.v1 ◽

2018 ◽

Cited By ~ 2

Author(s):

Snehamol Mathew ◽

Priyanka Ganguly ◽

Stephen Rhatigan ◽

Vignesh Kumaravel ◽

Ciara Byrne ◽

...

Keyword(s):

Visible Light ◽

Visible Light Irradiation ◽

Density Functional ◽

Anatase Phase ◽

Sol Gel ◽

Chemical Properties ◽

Light Irradiation ◽

Health Concern ◽

Bacterial Inactivation ◽

X Ray

Indoor surface contamination by microbes is a major public health concern. A damp environment is one potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proved as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu) doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500 °C – 700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterised through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV-visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV-DRS results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasises the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9%) was attained in 30 mins of visible light irradiation by Cu-TiO2.

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Characterization of sol-gel silica glass and its composites through study of physical and chemical properties of entrapped molecules

10.31274/rtd-180813-12127 ◽

2001 ◽

Author(s):

Jovica Dimitrije Badjić

Keyword(s):

Silica Glass ◽

Sol Gel ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Physical And Chemical ◽

And Chemical Properties

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The Influence Of NO/O2 On The NOx Storage Properties Over A Pt-Ba-Ce/γ-Al2O3 Catalyst

Open Chemistry ◽

10.1515/chem-2019-0153 ◽

2019 ◽

Vol 17 (1) ◽

pp. 1459-1465

Author(s):

Xuedong Feng ◽

Jing Yi ◽

Peng Luo

Keyword(s):

Sol Gel ◽

Chemical Properties ◽

No Oxidation ◽

Test Results ◽

X Ray Diffraction ◽

Storage Performance ◽

Transmission Electron ◽

Temperature Programmed ◽

Physical And Chemical ◽

Al2o3 Catalyst

AbstractWith the purpose of studying the influence of NO/O2 on the NOx storage activity, a Pt-Ba-Ce/γ-Al2O3 catalyst was synthesized by an acid-aided sol-gel method. The physical and chemical properties of the catalyst were characterized by X-ray diffraction (XRD) and Transmission Electron Microscope (TEM) methods. The results showed that the composition of the catalyst was well-crystallized and the crystalline size of CeO2 (111) was about 5.7 nm. The mechanism of NO and NO2 storage and NOx temperature programmed desorption (NO-TPD) experiments were investigated to evaluate the NOx storage capacity of the catalyst. Pt-Ba-Ce/γ-Al2O3 catalyst presented the supreme NOx storage performance at 350℃, and the maximum value reached to 668.8 μmol / gcat. Compared with O2-free condition, NO oxidation to NO2 by O2 had a beneficial effect on the storage performance of NOx. NO-TPD test results showed that the NOx species stored on the catalyst surface still kept relatively stable even below 350℃.

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Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.891 ◽

2011 ◽

Vol 197-198 ◽

pp. 891-894 ◽

Cited By ~ 1

Author(s):

Cheng Zhi Jiang ◽

Xu Dong Lu

Keyword(s):

Photocatalytic Activity ◽

Synergistic Effect ◽

Sol Gel ◽

Blue Shift ◽

Nano Particles ◽

Absorption Profile ◽

Co Doping ◽

The Matrix ◽

Co Doped ◽

The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

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Preparation and Photocatalytic Activity of Mixed Phase Anatase/rutile TiO2 Nanoparticles for Phenol Degradation

Jurnal Teknologi ◽

10.11113/jt.v70.3437 ◽

2014 ◽

Vol 70 (2) ◽

Author(s):

Mohamad Azuwa Mohamed ◽

Wan Norharyati Wan Salleh ◽

Juhana Jaafar ◽

Norhaniza Yusof

Keyword(s):

Photocatalytic Activity ◽

Tio2 Nanoparticles ◽

High Performance ◽

Sol Gel ◽

Phenol Degradation ◽

Chemical Properties ◽

Mixed Phase ◽

Rutile Tio2 ◽

Physico Chemical ◽

Degussa P25

The evolution of desirable physico-chemical properties in high performance photocatalyst materials involves steps that must be carefully designed, controlled, and optimized. This study investigated the role of key parameter in the preparation and photocatalytic activity analysis of the mixed phase of anatase/rutile TiO2 nanoparticles, prepared via sol-gel method containing titanium-n-butoxide Ti(OBu)4 as a precursor material, nitric acid as catalyst, and isopropanol as solvent. The prepared TiO2 nanoparticles were characterized by means of XRD, SEM, and BET analyses, and UV-Vis-NIR spectroscopy. The results indicated that the calcination temperature play an important role in the physico-chemical properties and photocatalytic activity of the resulting TiO2 nanoparticles. Different calcination temperatures would result in different composition of anatase and rutile. The photocatalytic activity of the prepared mixed phase of anatase/rutile TiO2 nanoparticles was measured by photodegradation of 50 ppm phenol in an aqueous solution. The commercial anatase from Sigma-Aldrich and Degussa P25 were used for comparison purpose. The mixed phase of anatase/rutile TiO2 nanoparticles (consists of 38.3% anatase and 61.7% rutile) that was prepared at 400°C exhibited the highest photocatalytic activity of 84.88% degradation of phenol. The result was comparable with photocatalytic activity demonstrated by Degussa P25 by 1.54% difference in phenol degradation. The results also suggested that the mixed phase of anatase/rutile TiO2 nanoparticles is a promising candidate for the phenol degradation process. The high performance of photocatalyst materials may be obtained by adopting a judicious combination of anatase/rutile and optimized calcination conditions.

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