Structural and photocatalytic properties of iron- and europium-doped TiO2 nanoparticles obtained under hydrothermal conditions

Diamandescu, L.; Vasiliu, F.; Tărăbăşanu-Mihăilă, D.; Féder, M.; Vlaicu, A. M.; Teodorescu, Cristian M.; Macovei, D.; Enculescu, Ionuţ; Pârvulescu, Viorica; Vasile, Eugeniu

doi:10.1016/j.matchemphys.2008.05.023

Cited by 96 publications

(48 citation statements)

References 28 publications

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“…In 2004, Sonawane et al [15] reported Fe-doped TiO 2 films that could photodegrade up to 95% of methyl orange in a solution after exposure to sunlight for 3-4 h. In 2005, Sreethawong et al [16] synthesized nanocrystalline mesoporous TiO 2 using sol-gel techniques combined with surfactant-assisted templating and evaluated its photocatalytic activity of the evolution of hydrogen from an aqueous methanol solution. In 2008, Diamandescu et al [17] reported a hydrothermal synthesis of iron and europium codoped TiO 2 materials under mild conditions. The photocatalytic activity for the degradation of phenol was improved under both visible and UV light by codoping.…”

Section: Historical Backgroundmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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Climate change and the consumption of non-renewable resources are considered as the greatest problems facing humankind. Because of this, photocatalysis research has been rapidly expanding. TiO 2 nanoparticles have been extensively investigated for photocatalytic applications including the decomposition of organic compounds and production of H 2 as a fuel using solar energy. This article reviews the structure and electronic properties of TiO 2 , compares TiO 2 with other common semiconductors used for photocatalytic applications and clarifies the advantages of using TiO 2 nanoparticles. TiO 2 is considered close to an ideal semiconductor for photocatalysis but possesses certain limitations such as poor absorption of visible radiation and rapid recombination of photogenerated electron/hole pairs. In this review article, various methods used to enhance the photocatalytic characteristics of TiO 2 including dye sensitization, doping, coupling and capping are discussed. Environmental and energy applications of TiO 2 , including photocatalytic treatment of wastewater, pesticide degradation and water splitting to produce hydrogen have been summarized. Historical backgroundThe growth of industry worldwide has tremendously increased the generation and accumulation of waste byproducts. In general, the production of useful products has been focused on and the generation of waste byproducts has been largely ignored. This has caused severe environmental problems that have become a major concern. Researchers all over the world have been working on various approaches to address this issue. Photoinduced processes have been studied and various applications have been developed. One important technique for removing industrial waste is the use of light energy (electromagnetic radiation) and particles sensitive to this energy to mineralize waste which aids in its removal from solution. Titanium dioxide (TiO 2 ) is considered very close to an ideal semiconductor for photocatalysis because of its high stability, low cost and safety toward both humans and the environment.*Corresponding author (email: shipra.mital@gmail.com)In 1964, Kato et al.[1] published their work on the photocatalytic oxidation of tetralin (1,2,3,4-tetrahydronaphthalene) by a TiO 2 suspension, which was followed by McLintock et al. [2] investigating the photocatalytic oxidation of ethylene and propylene in the presence of oxygen adsorbed on TiO 2 . However, the most important discovery that extensively promoted the field of photocatalysis was the "Honda-Fujishima Effect" first described by Fujishima and Honda in 1972 [3]. This well-known chemical phenomenon involves electrolysis of water, which is related to photocatalysis. Photoirradiation of a TiO 2 (rutile) single crystal electrode immersed in an aqueous electrolyte solution induced the evolution of oxygen from the TiO 2 electrode and the evolution of hydrogen from a platinum counterelectrode when an anodic bias was applied to the TiO 2 working electrode. In 1977, Frank and Bard [4] examined the reduction of ...

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Section: Historical Backgroundmentioning

confidence: 99%

A review of TiO2 nanoparticles

2011

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“…Eu 3+ doping in TiO 2 has been carried out by several researchers in order to achieve an improved luminescence of Eu 3+ by energy transfer from TiO 2 to Eu 3+ . Luminescence from nanoparticles and thin films of Eu 3+ doped TiO 2 showed the enhanced emission for samples heated below 400 • C, whereas for samples heated at higher than 400 • C, luminescence was found to decrease or even completely disappear at 900 • C [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Different groups have suggested diverse explanations for this behavior.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence studies on Eu doped TiO2 nanoparticles

Ningthoujam

Sudarsan

Vatsa

et al. 2009

Journal of Alloys and Compounds

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“…As photocatalysis is a surface phenomenon, it is often studied by XPS. Chemical states of doping atoms, such as metals (Fe and Eu) (278) or nitrogen (32,33) . The chemical states of doping atoms are derived, which is a useful parameter to be related with structural modifications, optical absorption, and photocatalytic efficiency.…”

Section: Photocatalysismentioning

confidence: 99%

X‐Ray Photoelectron Spectroscopy in Analysis of SurfacesUpdate based on the original article by Steffen Oswald,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Oswald

2013

Encyclopedia of Analytical Chemistry

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X‐ray photoelectron spectroscopy (XPS) is an analytical technique that uses photoelectrons excited by X‐ray radiation (usually Mg Kα or Al Kα) for the characterization of surfaces to a depth of 2–5 nm. Elemental identification and information on chemical bonding are derived from the measured electron energy and energy shifts, respectively. The use of ultrahigh vacuum (UHV) during analysis requires special sample handling. Depth profiling is possible using ion sputtering. In contrast to the most popular surface analytical technique, Auger electron spectroscopy (AES), nonconducting material can be investigated, weak material damage occurs, and the chemical shifts are easier to interpret. However, the lateral resolution of the complementary AES technique (typically down to 20 nm) is much better than for XPS (50 µm for standard equipment, down to lower than 3 µm for dedicated instruments). The detection limit (of about 0.1 at%) is not as low as for mass spectroscopic techniques, but the quantification from XPS peak area measurements is more reliable, even disclaiming standard sample measurements. This article briefly discusses the principles of the technique, sample requirements, and the typical measuring strategy. Possible information sources (elements, chemical bonding, depth and lateral distributions) are described and their quantification principles are summarized. The main part deals with typical applications relating to several material classes (metals, semiconductors, insulators, and polymers) to give an impression of the capabilities of the method over a wide range of research and technological problems. A comparison with further complementary analytical techniques is given as a summary. Technological developments in electronics, nanotechnology, polymers, biotechnology, and medicine are all concerned with surface‐related phenomena, suggesting sustained interest in XPS in the foreseeable future.

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Structural and photocatalytic properties of iron- and europium-doped TiO2 nanoparticles obtained under hydrothermal conditions

Cited by 96 publications

References 28 publications

A review of TiO2 nanoparticles

A review of TiO2 nanoparticles

Photoluminescence studies on Eu doped TiO2 nanoparticles

X‐Ray Photoelectron Spectroscopy in Analysis of SurfacesUpdate based on the original article by Steffen Oswald,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

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