Effects of photocatalytic activity of metal and non-metal doped Tio2 for Hydrogen production enhancement - A Review

AbstractA set of transition metal doped nanosized TiO2 particles with anatase structure were synthesized by the pulverization method and their ability to photocatalytically degrade the dye Alizarin Red S was investigated. Characterization of the Zr-, Co- and Mo-doped photocatalysts was conducted with the aid of XRD, SEM, EDX, TEM, BET and spectral analysis. X-ray diffraction patterns did not reflect the appearance of any peaks due to dopants, however dopants were observed in SEM-EDX analysis. Particle sizes were in the range of 25 nm as per TEM and XRD analysis. Upon doping, a prominent decrease in surface area was observed. The percentage composition of each of the dopants was confirmed by EDX analysis. Doped samples depicted many mid-bands in the Kubelka Munk plots due to d-d transition of dopants. Experiments were conducted to compare the photocatalytic activity under identical UV and solar light exposure. Zr-doped TiO2 at the molecular scale exhibited better photocatalytic activity in degradation of Alizarin, with a lower band-gap energy that can respond to visible light. However, Co- and Mo-doped TiO2 appeared to suppress the photoactivity. A rise in the number of mid-bands causing effective separation or recombination of charge carriers strongly influences the rate of the degradation process.

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Characterization and Photocatalytic Properties of Transition Metal Doped TiO2 and Nanocomposite TiO2 Powders Synthesized by Mechanical Alloying

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.119.195 ◽

2007 ◽

Vol 119 ◽

pp. 195-198

Author(s):

Dong Hyun Kim ◽

Ha Sung Park ◽

Jae Han Jho ◽

Wheung Whoe Kim ◽

Sun Jae Kim ◽

...

Keyword(s):

Heat Treatment ◽

Photocatalytic Activity ◽

Transition Metal ◽

Mechanical Alloying ◽

Rutile Phase ◽

Alloyed Powder ◽

Doped Tio2 ◽

Average Grain Size ◽

Xrd Patterns ◽

Metal Doped

Transition metal doped TiO2 (Ni, Fe, Cu) and nanocomposite TiO2 powders with rutile phase were synthesized by mechanical alloying and heat treatment, and were characterized by XRD, TEM, UV-DRS, and PL (Photoluminescence). Photocatalytic activity was also investigated with the degradation rate of 4-chlorophenol and measured by total organic carbon analyzer. TEMEDP and XRD patterns showed that the transition metal doped powders (only alloyed powder) were in the form of rutile phase with the particle size of 20-30 nm. The average grain size of transition metal doped powders was in the range of less than 10 nm. However, after heat treatment, the alloyed powder formed composite of the titanate and rutile phase. The UV-DRS and PL investigation showed that Ni doped 8 wt% nanocomposite TiO2 had the higher wavelength range (600-660 nm) (2.0-1.9 eV) than that of the commercial P-25 powder(380-400 nm) by Degussa Co. indicating that the Ni 8 wt% doped nanocomposite TiO2 shifted the absorption into the visible light region and thus, enhanced the photocatalytic activity. Further, these results agreed well with TOC investigation. Formation of titanate in transition metal doped TiO2 due to heat treatment was found to control the grain growth of nano-sized TiO2 and to enhance its thermal stability at high temperature.

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High photocatalytic activity of carbon doped TiO2 prepared by fast combustion of organic capping ligands

RSC Advances ◽

10.1039/c5ra19058d ◽

2015 ◽

Vol 5 (113) ◽

pp. 93635-93643 ◽

Cited By ~ 26

Author(s):

Yijun Yang ◽

Dawei Ni ◽

Ye Yao ◽

Yeteng Zhong ◽

Ying Ma ◽

...

Keyword(s):

Photocatalytic Activity ◽

Hydrogen Production ◽

High Photocatalytic Activity ◽

Doped Tio2 ◽

Carbon Doped ◽

Conventional Methods ◽

Organic Capping ◽

Capping Ligands

Carbon doped TiO2 prepared by fast combustion of oleylamine ligands exhibit much higher photocatalytic activity for hydrogen production than those prepared by conventional methods.

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Highly porous N-doped TiO2 hollow fibers with internal three-dimensional interconnected nanotubes for photocatalytic hydrogen production

RSC Advances ◽

10.1039/c5ra16492c ◽

2015 ◽

Vol 5 (107) ◽

pp. 88367-88374 ◽

Cited By ~ 24

Author(s):

Kuang-I Liu ◽

Chung-Yi Su ◽

Tsong-Pyng Perng

Keyword(s):

Photocatalytic Activity ◽

Hydrogen Production ◽

Lower Energy ◽

Energy Gap ◽

Light Harvesting ◽

Three Dimensional ◽

Hollow Fibers ◽

Photocatalytic Hydrogen Production ◽

Doped Tio2 ◽

Highly Porous

N-doped TiO2 hollow fibers with internal interconnected nanotubes possess a lower energy gap, greater light harvesting, and higher photocatalytic activity.

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