TiO 2 nanoparticles and TiO 2 @graphene quantum dots nancomposites as effective visible/solar light photocatalysts

Shafaee, Masoomeh; Goharshadi, Elaheh Kafshdare; Mashreghi, Mansour; Sadeghinia, Mohammad

doi:10.1016/j.jphotochem.2018.02.019

Cited by 77 publications

(40 citation statements)

References 33 publications

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“…The band gap energy, E g , of a semiconductor is calculated by fitting the optical transition at the absorption edge using the Tauc/David–Mott formula:

true (α h υ)^{n} = normalB (h υ - E_{normalg})

…”

Section: Resultsmentioning

confidence: 99%

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Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

2020

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An azo dye, Reactive Black 5 (RB5), was degraded by three photocatalysts of g‐C3N4, Ag(2 %)/g‐C3N4, and Ag(5 %)/g‐C3N4 with the specific surface areas of 34.41, 28.70, and 35.58 m2 g−1 and the band gaps of 2.52, 1.56, and 1.71 eV under sunlight illumination, respectively. The results showed 40 mg/L of g‐C3N4 could degrade completely 10 ppm RB5 at pH 3.4 within 10 min under sunlight irradiation with the first‐order rate constant of 0.312 min−1. Under the same conditions, the complete degradation time of RB5 reduced to 5 and 7 min when the plasmonic nanocomposites of Ag (2 %)/g‐C3N4 and Ag (5 %)/g‐C3N4 were used as photocatalysts, respectively. Ag content had an important influence on the photocatalytic activity of g‐C3N4 against RB5 so that Ag (2 %)/g‐C3N4 possessed the best photocatalytic efficiency with the rate constant of 0.795 min−1. In fact, Ag nanoparticles through the surface plasmon resonance effects and by accepting the photogenerated electrons could improve the visible‐light absorption and increase charge separation of g‐C3N4. The results showed superoxide radical is the main oxidant in the photodegradation of RB5.

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“…The band gap energy, E g , of a semiconductor is calculated by fitting the optical transition at the absorption edge using the Tauc/David–Mott formula:

true (α h υ)^{n} = normalB (h υ - E_{normalg})

…”

Section: Resultsmentioning

confidence: 99%

“…Their removal is very hard because they are stable against light, heat, and oxidants. One of the most appealing dye removal techniques is the use of a heterogeneous photocatalysts such as TiO 2 , ZnO, ZnS, and WO 3 . Unfortunately, most of photocatalysts are active under ultraviolet light because of their large band gaps.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

2020

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“…The nanostructured titanium (IV) oxide has high chemical and thermal stability, and with special doping by impurity levels in an electronic structure, it is uniquely capable of the creating new functional materials on itself, especially for (photo)catalysis, sensors, adsorption, and photovoltaics. The highly dispersed doped TiO 2 for the creation of a photocatalyst that would work efficiently in the visible spectrum, as well as the components of devices for the efficient conversion of solar energy into electricity (solar cells), is of particular interest [104][105][106][107][108][109].…”

Section: Properties Of Metal Oxides In the Different States Ofmentioning

confidence: 99%

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

Dontsova

Nahirniak

Астрелін

2019

Journal of Nanomaterials

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The features of the properties and creation of nanocomposite metal oxide materials, especially TiO2, ZnO, SnO2, ZrO2, and Fe3O4, and their applications for ecology are considered in the article. It is shown that nanomaterials based on them are very promising for use in the ecological direction, especially as sorbents, photocatalysts, and sensitive layers of gas sensors. The crystallochemical characteristics, surface structure, and surface phenomena that occur when they enter the water and air environment are given for these metal oxides, and it is shown that they play a significant role in obtaining the sorption and catalytic characteristics of these nanomaterials. Particular attention is paid to the dispersion and morphology of metal oxide particles by which their physical and chemical properties can be controlled. Synthesis methods of metal oxide nanomaterials and ways for creating of nanocomposites based on them are characterized, and it is noted that there are many methods for obtaining individual nanoparticles of metal oxides with certain properties. The main task is the correct selection and testing of parameters. The prospects for the production of metal oxide nanocomposites and their application for environmental applications are noted, which will lead to a fundamentally new class of materials and new environmental technologies with their participation.

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“…Metal sulfides have a relatively negative valence band (VB) edge and a narrower band gap derived from sulfide ions than metal oxides. Therefore, photocatalytic activity can be exhibited even with long wavelength light [10][11][12]. The addition of foreign elements, which is one of the ways to change these factors, greatly affects the characteristics of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cu and Ga Doped ZnIn2S4 under Visible Light on the High Generation of H2 Production

et al. 2019

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A Cu+ and Ga3+ co-doped ZnIn2S4 photocatalyst (Zn(1−2x)(CuGa)xIn2S4) with controlled band gap was prepared via a simple one-step solvothermal method. Zn(1−2x)(CuGa)xIn2S4 acted as an efficient photocatalyst for H2 evolution under visible light irradiation (λ > 420 nm; 4500 µW/cm2). The effects of the (Cu and Ga)/Zn molar ratios of Zn(1−2x)(CuGa)xIn2S4 on the crystal structure (hexagonal structure), morphology (microsphere-like flower), optical property (light harvesting activity and charge hole separation ability), and photocatalytic activity have been investigated in detail. The maximum H2 evolution rate (1650 µmol·h−1·g−1) was achieved over Zn0.84(CuGa)0.13In2S4, showing a 3.3 times higher rate than that of untreated ZnIn2S4. The bandgap energy of Zn(1−2x)(CuGa)xIn2S4 decreased from 2.67 to 1.90 eV as the amount of doping Cu+ and Ga3+ increased.

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TiO 2 nanoparticles and TiO 2 @graphene quantum dots nancomposites as effective visible/solar light photocatalysts

Cited by 77 publications

References 33 publications

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

The Effect of Cu and Ga Doped ZnIn2S4 under Visible Light on the High Generation of H2 Production

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TiO 2 nanoparticles and TiO 2 @graphene quantum dots nancomposites as effective visible/solar light photocatalysts

Cited by 77 publications

References 33 publications

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C3N4 Nanocomposites

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C3N4 Nanocomposites

Metaloxide Nanomaterials and Nanocomposites of Ecological Purpose

The Effect of Cu and Ga Doped ZnIn2S4 under Visible Light on the High Generation of H2 Production

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Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites

Highly Efficient Solar‐Catalytic Degradation of Reactive Black 5 Dye Using Mesoporous Plasmonic Ag/g‐C₃N₄ Nanocomposites