scholarly journals Correlation of fluorescence and photocatalytic activity of Co-doped TiO2

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.

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

2012 ◽  
Vol 12 (1) ◽  
pp. 34 ◽  
Author(s):  
Nhat Minh Doan ◽  
Carl Renan Estrellan ◽  
Anton Purnomo ◽  
Susan Gallardo ◽  
Chris Salim ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Phase ◽  
Sol Gel ◽  
Chemical Properties ◽  
Band Gap Energy ◽  
Blue Dye ◽  
Nano Tio2 ◽  
Co Doping ◽  
Reaction Rate Constants ◽  
Physical And Chemical

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.

scholarly journals PHOTOCATALYTIC AND ANTIBACTERIAL ACTIVITIES OF TiO2 AND SILVER AND ZINC DOPED TiO2 NANOPARTICLES

2020 ◽  
Vol 4 (12) ◽  
pp. 92-97
Author(s):  
Chelaramani K. ◽  
Varshney R. ◽  
Bhardwaj A.
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Antibacterial Activities ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method ◽  
Photocatalytic Activities ◽  
Physical And Chemical ◽  
Co Doped

The TiO2 and Ag and Zn doped TiO2 nanoparticles were synthesized by sol-gel method.The sol-gel method is one of the versatile method to prepare doped and co-doped nanoparticles. sol gel method has emerged as simpler and better option than physical and chemical procedures as it is fast, clean and eco-friendly alternative that does not involve any costly instruments .Synthesis of doped and co-doped nanoparticles having good photocatalytic activity have great potential for the degradation of dye. We have tried to develop new effective antimicrobial reagents with good photocatalytic activities which are not resistant to disease causing microbes.

scholarly journals Green Synthesis of N/Zr Co-Doped TiO2 for Photocatalytic Degradation of p-Nitrophenol in Wastewater

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 235
Author(s):  
Hayette Benkhennouche-Bouchene ◽  
Julien G. Mahy ◽  
Cédric Wolfs ◽  
Bénédicte Vertruyen ◽  
Dirk Poelman ◽  
...  
Keyword(s):  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Visible Region ◽  
Chemical Properties ◽  
Pure Tio2 ◽  
Molar Ratio ◽  
Xps Spectra ◽  
Doped Tio2 ◽  
Co Doped

TiO2 prepared by a green aqueous sol–gel peptization process is co-doped with nitrogen and zirconium to improve and extend its photoactivity to the visible region. Two nitrogen precursors are used: urea and triethylamine; zirconium (IV) tert-butoxide is added as a source of zirconia. The N/Ti molar ratio is fixed regardless of the chosen nitrogen precursor while the quantity of zirconia is set to 0.7, 1.4, 2, or 2.8 mol%. The performance and physico-chemical properties of these materials are compared with the commercial Evonik P25 photocatalyst. For all doped and co-doped samples, TiO2 nanoparticles of 4 to 8 nm of size are formed of anatase-brookite phases, with a specific surface area between 125 and 280 m2 g−1 vs. 50 m2 g−1 for the commercial P25 photocatalyst. X-ray photoelectron (XPS) measurements show that nitrogen is incorporated into the TiO2 materials through Ti-O-N bonds allowing light absorption in the visible region. The XPS spectra of the Zr-(co)doped powders show the presence of TiO2-ZrO2 mixed oxide materials. Under visible light, the best co-doped sample gives a degradation of p-nitrophenol (PNP) equal to 70% instead of 25% with pure TiO2 and 10% with P25 under the same conditions. Similarly, the photocatalytic activity improved under UV/visible reaching 95% with the best sample compared to 50% with pure TiO2. This study suggests that N/Zr co-doped TiO2 nanoparticles can be produced in a safe and energy-efficient way while being markedly more active than state-of-the-art photocatalytic materials under visible light.

scholarly journals Recent Development of Photocatalysts Containing Carbon Species: A Review

Catalysts ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 20 ◽  
Author(s):  
Zheng-Jun Shi ◽  
Ming-Guo Ma ◽  
Jie-Fang Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Carbon Nitride ◽  
Coupling Effect ◽  
Sol Gel ◽  
Future Perspective ◽  
Nano Composites ◽  
Doped Tio2 ◽  
Carbon Species ◽  
Co Doped ◽  
Carbon Based

Undoubtedly, carbon-based (nano)composites can be promising photocatalysts with improved photocatalytic activity due to the coupling effect from the incorporation of carbon species. In this mini-review, we focus on the recent development of photocatalysts based on carbon-based (nano)composites. TiO2 is well-known as a typical photocatalyst. Special attention is paid to the various types of carbon–TiO2 composites such as C-doped TiO2, N–C-doped TiO2, metal–C-doped TiO2, and other co-doped C/TiO2 composites. Various synthetic strategies including the solvothermal/hydrothermal method, sol–gel method, and template-directed method are reviewed for the preparation of carbon-based TiO2 composites. C/graphitic carbon nitride (g-C3N4) composites and ternary C-doped composites are also summarized and ascribed to the unique electronic structure of g-C3N4 and the synergistic effect of the ternary interfaces, respectively. In the end, we put forward the future perspective of the photocatalysts containing carbon species based on our knowledge.

Effect of Transition Metal Oxide Doping (Cr, Co, V) in the Photocatalytic Activity of TiO2 for Congo Red Degradation under Visible Light

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
P. W. Koh ◽  
L. Yuliati ◽  
S. L. Lee
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Congo Red ◽  
Sol Gel ◽  
Rutile Phase ◽  
Band Gap Energy ◽  
Electron Recombination ◽  
Doped Tio2 ◽  
Light Region ◽  
Electron Scavenger

Comparative study of Cr, Co or V-doped TiO2 was carried out. The photocatalysts were synthesized via sol-gel method. The results indicated that the dopants of Cr, Co, and V induced anatase to rutile phase transition of TiO2 at different dopant amounts of 1, 4, 2 mol%, respectively. Besides that, the existence of dopant extended the absorption wavelength of TiO2 to visible light region, thus making it a visible-driven photocatalyst. The doped transition metal exhibited different oxidation states on the TiO2 surface. The prepared photocatalysts were tested over photodegradation of Congo Red. Amongst all, Cr-doped TiO2 (3 mol%) was the best photocatalyst attributed to the presence of 45% rutile phase, reduced band gap energy of 2.30 eV and formation of Cr6+, which acted as an electron scavenger to delay the hole-electron recombination. 

scholarly journals Synthesis, characterization and photocatalytic activity of mesoporous Na-doped TiO2 nano-powder prepared via a solvent-controlled non-aqueous sol–gel route

RSC Advances ◽  
2017 ◽  
Vol 7 (85) ◽  
pp. 54053-54062 ◽  
Author(s):  
Inderjeet Singh ◽  
Balaji Birajdar
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Surface Area ◽  
Recombination Rate ◽  
Sol Gel ◽  
Electron Hole ◽  
Photo Catalytic Activity ◽  
Nano Powder ◽  
Hole Recombination ◽  
Enhanced Crystallinity

The superior photo-catalytic activity of mesoporous Na doped TiO2 attributed to the combined effect of electron–hole recombination rate, increased surface area and enhanced crystallinity.

Enhanced photocatalytic activity of (La, N) co-doped TiO2 by TiCl4 sol-gel autoigniting synthesis

2007 ◽  
Vol 14 (6) ◽  
pp. 552-557 ◽  
Author(s):  
Zhongqing Liu ◽  
Yanping Zhou ◽  
Zhenghua Li ◽  
Yichao Wang ◽  
Changchun Ge
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Doped Tio2 ◽  
Co Doped

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

2013 ◽  
Vol 781-784 ◽  
pp. 2237-2240 ◽  
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.

Synthesis and Properties of Carbon and Yttrium Co-Doped TiO2 Photocatalyst

2014 ◽  
Vol 809-810 ◽  
pp. 831-836
Author(s):  
Jian Mei Liu ◽  
Xing Hua Zhou ◽  
Zhong Qi Zhu ◽  
Jin Zhang ◽  
Qing Ju Liu
Keyword(s):  
Phase Transition ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Rutile Phase ◽  
Fluorescent Light ◽  
Yttrium Nitrate ◽  
Fluorescent Lamp ◽  
Experimental Conditions ◽  
Light Region ◽  
Co Doped

TiO2photocatalysts doped with different element of C and Y were synthesized by sol-gel process using glucose, yttrium nitrate and tetrabuty ltitanate as precursors. Samples characterized by XRD, XPS, TEM, PL and UV-Vis methods. The photocatalytic activity of samples was investigated by photocatalytic degradation of methylene-blue (MB) under the irradiation of fluorescent lamp. The results indicate that C ion and Y ion are incorporated into the lattice of TiO2, and C doping accelerate phase transition from anatase to rutile phase, but Y doping inhabits the phase transition. It was also found that both C and Y doping can broaden the absorption spectrum to visible light region and inhibit the recombination of the photo-generated electron and hole pairs. The synergy effect of co-doped C and Y ions provides C-Y-TiO2sample better photocatalytic activity than that of the single-doped samples and P25 under fluorescent lamp. The photocatalytic activity of the sample with C, Y co-doped is the best under the irradiation of fluorescent light. It is 94.23% within 3 hours and significantly higher than that of Degussa P25 (44.72%) under the same experimental conditions.

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