Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Bakbolat, Baglan; Daulbayev, Chingis; Sultanov, Fail; Beissenov, Renat; Umirzakov, Arman; Mereke, A.L.; Bekbaev, A. K.; Chuprakov, I.

doi:10.3390/nano10091790

Cited by 127 publications

(40 citation statements)

References 97 publications

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“…Note that upon practical applications of anatase as a photocatalyst, this doping is used to reduce the bandgap from E g ≈ 3.2 eV (pure crystalline anatase) toward E g < 3 eV for doped systems. This effect is important to prepare the photocatalysts working under visible light since E g = 3.2 eV corresponds to the ultraviolet band [38][39][40]. The PM7/PBC/IDES values of the bandgap for undoped and doped anatase (Figure 7) are in agreement with the experimental values as well as the IDES for graphite and C 60 .…”

Section: Resultssupporting

confidence: 66%

Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Gun'ko

2021

Int J of Quantum Chemistry

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A set of the characteristics calculated using any quantum chemical method can be attributed to local electronic structure, which may change for each atom in complex systems. Related average values can give poor characteristics because different atom fractions with different surroundings may have different electronic characteristics poorly corresponding to the average values. The aim of this work is to show that the distribution functions of atomic charges, as well as chemical shifts and molecular orbital energies, can be considered as a set of simple tools for easy analysis of complex systems within the scope of nonlocal characteristics describing whole systems.The approach efficiency and analysis adequacy depend on appropriateness of molecular and cluster models used. The systems with dozens or hundreds of molecules and solid nanoparticles of almost real sizes (>40 units, >2 nm) or calculated with periodic boundary conditions and expanded cells give more adequate nonlocal characteristics than much smaller systems with several molecules and small clusters (<10 units, <1 nm) can give.

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Section: Resultssupporting

confidence: 66%

Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Gun'ko

2021

Int J of Quantum Chemistry

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“…1. Raw material preparation in a quartz furnace (200-500 °C, 2 h, argon); In the SEM images (11) it can be seen that after the carbonization process, thinner and smoother fibers are formed in all samples, this is because all volatile substances evaporate under the influence of temperature. The property of preservation of fibrous structures in all samples is also noted, which is explained by the influence of the formation of mesophase centers in the fiber structure.…”

Section: Obtaining Carbon Fibers By the Methods Of Electrospinningmentioning

confidence: 99%

“…The output of water purification devices is launched. TiO 2 and its derivatives are widely used in the production of photocatalysts, which may be utilized in hydrogen evolution and dye degradation areas [6][7][8][9][10][11]. Perovskite wide-gap semiconductors, mainly presented by SrTiO 3 and its doped modifications with a cubic structure are of great interest due to their strong catalytic activity, high chemical stability and long lifetime of electron-hole pairs [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Recent Achievements and Future Challenges in Nanoscience and Nanotechnology

Mansurov¹

2020

Eurasian Chem. Tech. J.

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The article presents the investigation results of the formation and synthesis of nanosized materials which were obtained at the Institute of Combustion Problems, many works have been brought to practical use. Investigations of low-temperature soot formation become the basis of nanomaterial synthesis methods, developed at the Institute for Combustion Problems since 1985. Flame can be considered as a chemical reactor to produce target products. The main feature of the processes based on technological combustion is that the target product is formed as a result of the combustion reaction, occurring spontaneously at high temperatures with a high speed without consuming external energy, i.e. due to its own heat. With the development of nanotechnology, new challenges have emerged in the synthesis of nanomaterials under combustion synthesis conditions. Below is a list of works on nanomaterials synthesis carried out at the Institute: complete scheme of soot formation; energy intensive nanocarbon materials; development and study of perovskite photocatalysts for hydrogen evolution; obtaining carbon fibers by the method of electrospinning; obtaining of biologically soluble membranes based on polymeric nanofibres and hydroxyapatite of calcium; synthesis of nanocarbon sorbents for purification of water from heavy metal ions.

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“…These facts have aroused great interest in investigating wastewater treatment techniques that remove or degrade PPCPs, including filtration [10,11], adsorption [12,13], coagulation/flocculation [14], biological processes [15,16], and degradation by various advanced oxidation processes (AOPs) such as photo-Fenton [17,18], ozonation [19,20], ultrasound treatment [21], electrochemical oxidation [22,23], ultraviolet (UV)/H 2 O 2 [24,25], etc. Among the AOPs, degradation using ultraviolet-visible (UV-Vis) irradiation and nanomaterials as photocatalytic agents must be highlighted due to the promising results obtained up to now [26][27][28][29][30][31]. Advantages of this method include application at low temperatures and ambient pressures, low environmental impact, easy mineralization of contaminants, and low operating costs [32].…”

Section: Introductionmentioning

confidence: 99%

Nanomaterial Synthesis in Ionic Liquids and Their Use on the Photocatalytic Degradation of Emerging Pollutants

et al. 2021

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The unique properties of ionic liquids make them suitable candidates to prepare nanoscale materials. A simple method that uses exclusively a corresponding bulk material and an ionic liquid—in this case, [P6,6,6,14]Cl—was used to prepare AgCl nanoparticles and AgCl@Fe3O4 or TiO2@Fe3O4 magnetic nanocomposites. The prepared nanomaterials were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible spectroscopy, and X-ray photoelectron spectroscopy. The photodegradation of atenolol as a model pharmaceutical pollutant in wastewater was investigated under ultraviolet–visible light irradiation using the different synthesized nanocatalysts. In the presence of 0.75 g·L−1 AgCl nanoparticles, a practically complete degradation of 10 ppm of atenolol was obtained after 30 min, following pseudo-first-order reaction kinetics. The effect of different variables (concentrations, pH, oxidant agents, etc.) was analyzed. The recyclability of the nanocatalyst was tested and found to be successful. A degradation mechanism was also proposed. In order to improve the recovery stage of the nanocatalyst, the use of magnetic nanocomposites is proposed. Under the same experimental conditions, a slightly lower and slower degradation was achieved with an easier separation. The main conclusions of the paper are the suitability of the use of ionic liquids to prepare different nanocatalysts and the effectiveness of these at degrading an emerging pollutant in wastewater treatment.

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Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Cited by 127 publications

References 97 publications

Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Recent Achievements and Future Challenges in Nanoscience and Nanotechnology

Nanomaterial Synthesis in Ionic Liquids and Their Use on the Photocatalytic Degradation of Emerging Pollutants

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