Journal ArticleDOI
A Visible Light-Driven Titanium Dioxide Photocatalyst Codoped with Lanthanum and Iodine: An Application in the Degradation of Oxalic Acid
TLDR
In this article, a series of photocatalysts was synthesized by codoping TiO2 with lanthanum and iodine (La−I−TiO2), and the structure and properties of the catalysts were studied by X-ray diffraction (XRD), the Brunauer−Emmett−Teller (BET) method, transmission electron microscopy (TEM), Xray photoelectron spectroscopy (XPS), and UV−vis diffuse reflectance spectra.Abstract:
A series of photocatalysts was synthesized by codoping TiO2 with lanthanum and iodine (La−I−TiO2). The structure and properties of the catalysts were studied by X-ray diffraction (XRD), the Brunauer−Emmett−Teller (BET) method, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV−vis diffuse reflectance spectra. The prepared anatase-phase La−I−TiO2 (molar ratio 20:20:100) calcined at 400 °C had a BET surface area of 92.9 m2 g−1, and the crystallite size calculated from XRD data was ∼3.57 nm, and it had a remarkable absorption in the visible light range of 400−550 nm. The catalytic efficiency was tested by monitoring the photocatalytic degradation of oxalic acid under visible light irradiation. An optimum molar ratio of 20:100 La/TiO2 was determined for the most efficient inhibition of the recombination of electron−hole pairs and the photocatalytic activity of La−I−TiO2 calcined at 400 °C was significantly higher than that calcined at 500 or 600 °C in aqueous oxalic acid so...read more
Citations
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Journal ArticleDOI
Semiconductor-based Photocatalytic Hydrogen Generation
TL;DR: Approaches to Modifying the Electronic Band Structure for Visible-Light Harvesting and its Applications d0 Metal Oxide Photocatalysts 6518 4.4.1.
Journal ArticleDOI
Review on Modified TiO2 Photocatalysis under UV/Visible Light: Selected Results and Related Mechanisms on Interfacial Charge Carrier Transfer Dynamics
S. Girish Kumar,L. Gomathi Devi +1 more
TL;DR: This review encompasses several advancements made in these aspects of titania, and also some of the new physical insights related to the charge transfer events like charge carrier generation, trapping, detrapping, and their transfer to surface are discussed for each strategy of the modified titania to support the conclusions derived.
Journal ArticleDOI
Advanced Oxidation Processes for Wastewater Treatment: Formation of Hydroxyl Radical and Application
Jianlong Wang,Le Jin Xu +1 more
TL;DR: In this paper, the authors summarize the formation reactions of the hydroxyl radical (·OH) and the mechanisms of pollutants degradation in six types of advanced oxidation processes, including radiation, photolysis and photocatalysis, sonolysis, electrochemical oxidation technologies, Fenton based reactions, and ozone-based processes.
Journal ArticleDOI
A review on non metal ion doped titania for the photocatalytic degradation of organic pollutants under UV/solar light: Role of photogenerated charge carrier dynamics in enhancing the activity
L. Gomathi Devi,R. Kavitha +1 more
TL;DR: In this article, the photocatalytic activity of non metal doped titania for a wide variety of pollutants degradation under UV/visible light, with special emphasis on nitrogen doped TiO 2.
Journal ArticleDOI
Mechanism Investigation of Visible Light-Induced Degradation in a Heterogeneous TiO2/Eosin Y/Rhodamine B System
TL;DR: The results showed that the photodegradation of RhB is enhanced significantly when EO is introduced into the P-25/RhB system, and it can be deduced that dissolved O(2) plays a crucial role in dye photodegrading and the O(*-) anion is possibly the major active oxygen species.
References
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Journal ArticleDOI
Electrochemical Photolysis of Water at a Semiconductor Electrode
Akira Fujishima,Kenichi Honda +1 more
TL;DR: Water photolysis is investigated by exploiting the fact that water is transparent to visible light and cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm.
Journal ArticleDOI
Daylight photocatalysis by carbon-modified titanium dioxide
Journal ArticleDOI
Band gap narrowing of titanium dioxide by sulfur doping
TL;DR: In this paper, the authors used ab initio band calculations to find that mixing of the S 3p states with the valence band can contribute to the band gap narrowing, based on the theoretical analyses.
Bandgap narrowing of titanium dioxide by sulfur doping
Abstract: Titanium dioxide (TiO2) doped with sulfur (S) was synthesized by oxidation annealing of titanium disulfide (TiS2). According to the x-ray diffraction patterns, TiS2 turned into anatase TiO2 when annealed at 600 °C. The residual S atoms occupied O-atom sites in TiO2 to form Ti–S bonds. The S doping caused the absorption edge of TiO2 to be shifted into the lower-energy region. Based on the theoretical analyses using ab initio band calculations, mixing of the S 3p states with the valence band was found to contribute to the band gap narrowing.
Journal ArticleDOI
Efficient Degradation of Toxic Organic Pollutants with Ni2O3/TiO2-xBx under Visible Irradiation
TL;DR: The study demonstrates that the modification of TiO2 both to extend its spectral response to the visible region and to improve its catalytic efficiency can be achieved by doping with boron, a nonmetal, and Ni2O3, a metal oxide.
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