Enhancement of the photo catalytic performance of TiO2 catalysts via transition metal modification

Wu, Chun Guey; Chao, Chia Cheng; Kuo, Fang Ting

doi:10.1016/j.cattod.2004.04.055

Cited by 96 publications

(46 citation statements)

References 22 publications

(26 reference statements)

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“…1, 2 Among the different transparent materials, TiO2 is one of the most studied partially because of its interesting properties and promising applications in photocatalysis, solar cells, batteries or gas sensors. [3][4][5][6][7][8][9][10][11][12][13][14] Moreover, from the synthesis point of view, TiO2 results especially relevant because of the different synthetic methods that can be employed to obtain this material. For instance, TiO2 UV photodetectors fabricated by sol-gel, potentiostatic anodization or radio-frequency magnetron sputtering have been recently demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres

et al. 2016

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In this work we study the optoelectronic properties of individual TiO2 fibres produced through coupled sol-gel and electrospinning, by depositing them onto pre-patterned Ti/Au electrodes on SiO2/Si substrates. Transport measurements in the dark give a conductivity above 2·10 -5 S, which increases up to 8·10 -5 S in vacuum. Photocurrent measurements under UV-irradiation show high sensitivity (responsivity of 90 A·W -1 for 375 nm wavelength) and a response time to illumination of ~ 5 s, which is superior to state-of-the-art TiO2-based UV photodetectors. Both responsivity and response speed are higher in air than in vacuum, due to oxygen adsorbed on the TiO2 surface which traps photoexcited free electrons in the conduction band, thus reducing the recombination processes. The photodetectors are sensitive to light polarization, with an anisotropy ratio of 12%. These results highlight the interesting combination of large surface area and low 1D transport resistance in electrospun TiO2 fibres. The simplicity of the sol-gel/electrospinning synthesis method, combined with a fast response and high responsivity makes them attractive candidates for UV-photodetection in ambient conditions. We anticipate their high (photo) conductance is also relevant for photocatalysis and dye-sensitized solar cells.

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Section: Introductionmentioning

confidence: 99%

Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres

et al. 2016

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“…Besides metal dopants, transition metals dopants such as palladium (Pd), chromium (Cr), and silver (Ag) have been investigated by Wu et al [48] to enhance the photocatalytic performance of nano-doped-TiO 2 . Among the transition metals dopants tested, Pd ion had the strongest interaction with nano-TiO 2 and improved its morphology most effectively.…”

Section: Effect Of Metal Dopingmentioning

confidence: 99%

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Tan

Wong

Mohamed

2011

ISRN Materials Science

111

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This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO 2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO 2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO 2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO 2 , initial reactant concentration, dosage of doped TiO 2 , and dopant doping concentration.

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“…These include dye sensitization, semiconductor coupling, impurity doping, use of coordination metal complexes and metal deposition. 4,[10][11][12][13][14] Composites such as TiO2/carbon have also been reported. 15 Physical modification of TiO2 with small amounts of transition metal cations such as vanadium and chromium extends the absorption up to 550 nm and makes it active under UV as well as sunlight.…”

Section: Introductionmentioning

confidence: 99%

MnO2 AND MnO2/TiO2 MEDIATED, PERSULPHATE ENHANCED PHOTOCATALYSIS FOR THE REMOVAL OF INDIGO CARMINE DYE POLLUTANT FROM WATER

Lekshmi¹,

Yesodharan²,

Yesodharan³

2017

ECB

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Heterogeneous photocatalysis using UV/VIS light or natural solar radiation as the energy source is one of the most efficient advanced oxidation processes (AOP) for the removal of chemical and bacterial pollutants from water. One of the least investigated oxides in this context, i.e. MnO2 and its combination MnO2/TiO2 are examined as potential photocatalysts for the removal of Indigo carmine (IC) dye pollutant from the water. The catalysts are characterized by XRD, FTIR, SEM, TEM, adsorption and surface area measurements. While MnO2 is very efficient for the decolorization of the dye, it is not effective enough for mineralization. MnO2 /TiO2 as the photocatalyst at the optimized ratio of 9:1 combines the advantages of both the oxides, i.e., rapid decolorization and efficient mineralization. Persulphate (S2O8 2-) enhances the degradation while H2O2 inhibits the same. The degradation is dependent on pH with higher degradation under extremely acidic conditions. The influence of dissolved salts/anions in the water on the degradation varies from 'moderate inhibition' to 'no effect' or even 'enhancement' depending on the chemistry of the anion and reaction conditions. Effect of various parameters such as reaction time, substrate concentration, catalyst dosage, the presence of O2, recycling of the catalyst, etc. on the efficiency of degradation is investigated. The results are critically analyzed, and a tentative mechanism is proposed.

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Enhancement of the photo catalytic performance of TiO2 catalysts via transition metal modification

Cited by 96 publications

References 22 publications

Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres

Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

MnO2 AND MnO2/TiO2 MEDIATED, PERSULPHATE ENHANCED PHOTOCATALYSIS FOR THE REMOVAL OF INDIGO CARMINE DYE POLLUTANT FROM WATER

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Enhancement of the photo catalytic performance of TiO2 catalysts via transition metal modification

Cited by 96 publications

References 22 publications

Highly responsive UV-photodetectors based on single electrospun TiO2 nanofibres

Highly responsive UV-photodetectors based on single electrospun TiO2 nanofibres

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

MnO2 AND MnO2/TiO2 MEDIATED, PERSULPHATE ENHANCED PHOTOCATALYSIS FOR THE REMOVAL OF INDIGO CARMINE DYE POLLUTANT FROM WATER

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Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres

Highly responsive UV-photodetectors based on single electrospun TiO₂ nanofibres