Journal ArticleDOI
Heterogeneous photocatalytic reactions comparing tio2 and pt/tio2
Ulrich Siemon,Detlef W. Bahnemann,Juan J. Testa,Diana Rodrı́guez,Marta I. Litter,Natalia Bruno +5 more
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TLDR
In this article, the effect of platinum on titania was analyzed on the basis of proposed mechanisms, and the initial photonic efficiencies and conversion degrees have been calculated from kinetic profiles.Abstract:
Two commercial samples, namely Degussa P-25 and Sachtleben Hombikat UV 100, and platinized modifications of these samples have been tested comparatively as photocatalysts for EDTA oxidation and for Cr(VI) reduction in the absence and in the presence of EDTA. Platinized photocatalysts were prepared by photoimpregnation of H 2 PtCl 6 on TiO 2 by prolonged irradiation in the presence of methanol. Only slight differences in efficiency were found between both pure commercial forms, except for the Cr(VI) reduction in the presence of EDTA, where Hombikat UV 100 samples were more active. Platinized Hombikat UV 100 was found to be less active for Cr(VI) reduction in water. The concentration of dissolved molecular oxygen was crucial for EDTA oxidation and had no influence on Cr(VI) reduction. From kinetic profiles, initial photonic efficiencies ( ζ ) and conversion degrees have been calculated. Platinization did not improve Cr(VI) reduction but increased the initial photonic efficiency for EDTA oxidation. However, after prolonged irradiation, the conversion of EDTA was lower employing platinized samples instead of pure samples. The effect of platinum on titania was analyzed on the basis of proposed mechanisms.read more
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Journal ArticleDOI
Photoinduced reactivity of titanium dioxide
TL;DR: In this paper, photo-induced superhydrophilicity was used on the surface of a wide-band gap semiconductor like titanium dioxide (TiO 2 ) for photocatalytic activity towards environmentally hazardous compounds.
Journal ArticleDOI
Advanced Nanoarchitectures for Solar Photocatalytic Applications
TL;DR: UV-Visible ار راد ن .د TiO2 ( تیفرظ راون مان هب نورتکلا یاراد لماش VB و ) رگید اب لاقتنا VB (CO2) .
Journal ArticleDOI
Photoelectrocatalytic materials for environmental applications
TL;DR: In this paper, the authors summarized recent research on and development of semiconductor-based photocatalyst materials that are applicable to environmental remediation and/or chemical synthesis purposes, including the incorporation of noble metal nanoclusters onto the surface of semiconducted particles.
Journal ArticleDOI
Photocatalytic degradation of various dyes by combustion synthesized nano anatase TiO2
TL;DR: In this paper, the 8-10 nm pure anatase phase titania with $156 m^2/g$ BET surface area was prepared by solution combustion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Xray photoelectron spectroscopy (XPS), and BET surface areas.
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Heterogeneous Photocatalytic Reduction of Chromium(VI) over TiO2 Particles in the Presence of Oxalate: Involvement of Cr(V) Species
TL;DR: In this paper, the photonic efficiencies for Cr(VI) reduction are nearly the same under aerobic and anaerobic conditions, but show a significant increase at the lowest pH.
References
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Environmental Applications of Semiconductor Photocatalysis
TL;DR: The slow pace of hazardous waste remediation at military installations around the world is causing a serious delay in conversion of many of these facilities to civilian uses as discussed by the authors, which is a serious problem.
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Photocatalysis on TiO2 Surfaces - Principles, Mechanisms, and Selected Results
TL;DR: In this article, the authors focus on interfacial processes and summarize some of the operating principles of heterogeneous photocatalysis systems, including the electron transfer and energy transfer processes in photocatalytic reactions.
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Photochemical processes for water treatment
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A New Sensitive Chemical Actinometer. II. Potassium Ferrioxalate as a Standard Chemical Actinometer
C. G. Hatchard,C. A. Parker +1 more
TL;DR: In this paper, a detailed study has been made of the photolysis of the acidified solutions previously recommended for chemical actinometry, and accurate values of quantum efficiency have been determined at twelve wavelengths between 254 and 578 m$\mu $, and the effect of temperature, light intensity and of photolyte composition have been investigated.
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Heterogeneous photocatalysis: Transition metal ions in photocatalytic systems
TL;DR: In this paper, the presence of transition metal ions in photocatalytic reactions is reviewed according to two main approaches: (a) the influence of metal ions on the rate of photocatalysis and (b) the transformation of the ions to less toxic species or their deposition on the semiconductor catalyst surface for recovery of expensive and useful metals.