Enhancement of the intrinsic photocatalytic activity of TiO2 in the degradation of 1,3,5-triazine herbicides by doping with N,F

Samsudin, Emy Marlina; Hamid, Sharifah Bee Abd; Juan, Joon Ching; Basirun, Wan Jefrey; Centi, Gabriele

doi:10.1016/j.cej.2015.05.125

Cited by 58 publications

(15 citation statements)

References 73 publications

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“…Such localized states are generated above the lower limit of the valence band (type p doping) or below the upper limit of the conduction band (type n doping) and are responsible for the absorption of less energetic light. This allows the activation of TiO 2 under visible light [9][10][11][12][13][14][15][16][17][18][19][20] . Figure 4 shows the UV-VIS spectra for the films, which reveal that modifications with the doping agents significantly affected the visible light absorption of the TiO 2 -NF and TiO 2 -TNF samples.…”

Section: Characterization Of the Photocatalyst Filmsmentioning

confidence: 99%

“…In this context, doping with non-metallic elements such as N, F, C, S and B [9][10][11][12][13][14][15][16][17][18][19][20] has become an attractive alternative because this type of modification results in materials with a low recombination rate, great chemical stability and good response to visible light, relative to metallic doping 3,21 . Recently, it has been suggested that the use of codoped systems such as N and F 13,15,19,20 , N and B 14 , and N and V 16 allow to compensate for the excess charge from substitutional doping with N. Additionally, these codoped materials are effectively used in the charge separation of photogenerated electrons and holes, improving photoelectrocatalytic activity [13][14][15][16]19,20 .…”

Section: Introductionmentioning

confidence: 99%

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N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

et al. 2017

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N-F codoped TiO 2 films were immobilized on stainless steel sheets through a combined approach involving a dip-coating technique and a hydrothermal treatment, followed by calcination at 400°C in the presence of air. Photocatalyst characterization was conducted using XRD, Raman and UV-VIS spectroscopy as well as SEM. The films were tested in a three-electrode cell for the photoelectrocatalytic degradation of CN-containing compounds. The results showed that the increase in the degradation rate of CN-containing compounds is both influenced by a synergistic effect of the doping agents and strongly dependent on the concentration of CN-containing compounds in the solution. Nitrogen contributed to the enhanced photoactivity under visible light due to the generation of localized states within the band gap of TiO 2 , whereas the presence of fluoride improved the superficial properties of the film, which resulted in higher amounts of CN-containing compounds that were degraded by direct charge transfer through the photogenerated holes.

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Section: Characterization Of the Photocatalyst Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

et al. 2017

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“…Recently, Samsudin et al used (N, F) codoping to improve the intrinsic properties of the TiO 2 catalyst and found that the (N, F) codoping not only introduced activity in the visible light region but also improved the performances of intrinsic TiO 2 itself. The high activity could be attributed to the presence of N and F, which resulted in the change in the morphology and increasing presence of {001} facets [262]. Subsequently, a great number of experiments and theoretical calculations were carried out to further discuss (N, F) codoping in TiO 2 crystals [263][264][265][266][267].…”

Section: N-nonmetal Codopingmentioning

confidence: 99%

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Huang¹,

Yan²,

Zhao³

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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As a kind of highly effective, low-cost, and stable photocatalysts, TiO 2 has received substantial public and scientific attention. However, it can only be activated under ultraviolet light irradiation due to its wide bandgap, high recombination, and weak separation efficiency of carriers. Doping is an effective method to extend the light absorption to the visible light region. In this chapter, we will address the importance of doping, different doping modes, preparation method, and photocatalytic mechanism in TiO 2 photocatalysts. Thereafter, we will concentrate on Ti 3+ self-doping, nonmetal doping, metal doping, and codoping. Examples of progress can be given for each one of these four doping modes. The influencing factors of preparation method and doping modes on photocatalytic performance (spectrum response, carrier transport, interfacial electron transfer reaction, surface active sites, etc.) are summed up. The main objective is to study the photocatalytic processes, to elucidate the mechanistic models for a better understanding the photocatalytic reactions, and to find a method of enhancing photocatalytic activities.

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“…In this regard, a lot of effort was made to design and tailor physical, chemical and optical properties of TiO 2 to extend its absorption to the visible range. Various strategies, such as surface photosensitization [1], doping with heteroatoms [2], charge transfer (CT)…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Studies on the Visible Light Activity of TiO2 Modified with Halide-Based Ionic Liquids

et al. 2020

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Formation of a surface complex between organic molecules and TiO2 is one of the possible strategies for the development of visible light-induced TiO2 photoactivity. Herein, three ionic liquids (ILs) with the same cation and different anions (1-butylpirydynium chloride/bromide/iodide) have been applied for the surface modification of TiO2 and to understand the role of anions in visible light-induced activity of ILs-TiO2 systems. Photocatalytic screening tests (the measurements of phenol photodegradation reaction rate) revealed that anion type affected visible light activity (λ > 420 nm) of TiO2 obtained by the ILs-assisted solvothermal method. Density functional theory (DFT) calculations demonstrated that interactions between halogen anions and oxygen vacancies (OV) on the surface of the TiO2 particles could be responsible for the specific wavelength-induced excitation and finally for the observed photoactivity of titania under visible light. Finally, our theoretical calculations have been proven by experiments using monochromatic light (the apparent quantum efficiency was measured) and the properties of obtained samples were characterized using scanning electron microscopy (SEM), X-ray powder diffraction analysis (XRD), UV-Vis spectroscopy and X-ray photoelectron spectroscopy (XPS).

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Enhancement of the intrinsic photocatalytic activity of TiO2 in the degradation of 1,3,5-triazine herbicides by doping with N,F

Cited by 58 publications

References 73 publications

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

N and F Codoped TiO2 Thin Films on Stainless Steel for Photoelectrocatalytic Removal of Cyanide Ions in Aqueous Solutions

Influences of Doping on Photocatalytic Properties of TiO2 Photocatalyst

Theoretical and Experimental Studies on the Visible Light Activity of TiO2 Modified with Halide-Based Ionic Liquids

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