Solar photocatalytic degradation of methylene blue using doped TiO2 nanoparticles

Bhosale, R.R.; Pujari, S. R.; Muley, G.G.; Patil, Sagar H.; Patil, K.R.; Shaikh, Marium; Gambhire, A.B.

doi:10.1016/j.solener.2014.02.043

Cited by 54 publications

(21 citation statements)

References 26 publications

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“…10 Nitrogen in N-doped TiO 2 leads to formation of Ti 3+ species, which can trap photogenerated electrons in the conduction band and prevent recombination of electron-hole pairs. 68 Therefore, formation of Ti 3+ species enhances photocatalytic activity, which is evident from XPS spectra (see Figure 10B). Crystallite size also has a pronounced effect: the enhanced photocatalytic activity of N-doped TiO 2 can be attributed to its smaller crystal size (seen with Rietveld refinement), which accelerates surface charge transfer, decreasing the likelihood of recombination of photoinduced electron-hole pairs.…”

Section: Investigation Of Photocatalytic Efficiencymentioning

confidence: 87%

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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This article reports the synthesis and characterization of pure and N-, B-, and Ag-doped TiO 2 and the ability of these oxides to photodegrade methylene blue (MB) under sunlight or UV-ABC radiation. The compounds were synthesized using the sol-gel method and characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Photocatalytic efficiency was significantly increased by N-doping, resulting in 98% MB decomposition under UV-ABC irradiation for 180 min. Ag-and B-doped TiO 2 lowered MB degradation rates to 52 and 73%, respectively, compared with pure TiO 2 . The same behavior was observed with exposure to UV-Vis, with 88, 65, 60, and 42% MB removal with N-doped, pure, B-doped, and Ag-doped TiO 2 , respectively. Under visible light alone, N-doped TiO 2 exhibited higher photocatalytic efficiency than commercial P25-type TiO 2 . Photocatalysis with N-doped TiO 2 proved to be a promising alternative for MB degradation, given the potential of employing solar energy, thus minimizing operating costs.

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Section: Investigation Of Photocatalytic Efficiencymentioning

confidence: 87%

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Bezerra¹,

Cavalcante²,

Garcia³

et al. 2017

J. Braz. Chem. Soc.

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“…On the other hand, the electron in the conduction band reacts with dissolved oxygen species to generate superoxide anion radicals, which are again highly reactive for oxidizing organic compounds (Akpan and Hameed, 2009). Till now, many kinds of semiconductors have been studied as photocatalysts such as TiO 2 , ZnO, ZnS, WO 3 , and CdS (Rehman et al, 2009;Sharma et al, 2012;Bhosale et al, 2014;Chandran et al, 2014). TiO 2 is the most widely used effective photocatalyst for its high efficiency, non-toxic nature, low cost and photochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

2016

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“…For a typical procedure, using sample 10-500 as an example, 6.24 g (18.3 mmol) of titanium n-butoxide [Ti(O-Bu) 4 ; M w = 340.32 g/mol; Sigma-Aldrich, 97%) was added to 14.4 g of absolute ethanol (Koptec, 200 proof) in a 70 mL glass bottle, and the solution was acidified with 2.49 g (27.5 mmol of HNO 3 ) of concentrated nitric acid (EMD, 15.7 M). In a separate bottle, 0.48 g (2.0 mol) of ZrCl 4 (233.04 g/mol; Alfa-Aesar, 99.5+%) was hydrolyzed by 3.20 g of deionized water (Caution!…”

Section: Methodsmentioning

confidence: 99%

Unusual Changes in Electronic Band-Edge Energies of the Nanostructured Transparent n-Type Semiconductor Zr-Doped Anatase TiO₂ (Ti_1–xZr_xO₂; x < 0.3)

2016

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By the establishment of highly controllable synthetic routes, electronic band-edge energies of the n-type transparent semiconductor Zr-doped anatase TiO2 have been studied holistically for the first time up to 30 atom % Zr, employing powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen gas sorption measurements, UV/vis spectroscopies, and Mott-Schottky measurements. The materials were produced through a sol-gel synthetic procedure that ensures good compositional homogeneity of the materials, while introducing nanoporosity in the structure, by achieving a mild calcination condition. Vegard's law was discovered among the homogeneous samples, and correlations were established between the chemical compositions and optical and electronic properties of the materials. Up to 20% Zr doping, the optical energy gap increases to 3.29 eV (vs 3.19 eV for TiO2), and the absolute conduction band-edge energy increases to -3.90 eV (vs -4.14 eV). The energy changes of the conduction band edge are more drastic than what is expected from the average electronegativities of the compounds, which may be due to the unnatural coordination environment around Zr in the anatase phase.

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Solar photocatalytic degradation of methylene blue using doped TiO2 nanoparticles

Cited by 54 publications

References 26 publications

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

Unusual Changes in Electronic Band-Edge Energies of the Nanostructured Transparent n-Type Semiconductor Zr-Doped Anatase TiO₂ (Ti_1–xZr_xO₂; x < 0.3)

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Solar photocatalytic degradation of methylene blue using doped TiO2 nanoparticles

Cited by 54 publications

References 26 publications

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Synthesis, Characterization, and Photocatalytic Activity of Pure and N-, B-, or Ag- Doped TiO2

Fast and quick degradation properties of doped and capped ZnO nanoparticles under UV–Visible light radiations

Unusual Changes in Electronic Band-Edge Energies of the Nanostructured Transparent n-Type Semiconductor Zr-Doped Anatase TiO2 (Ti1–xZrxO2; x < 0.3)

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Unusual Changes in Electronic Band-Edge Energies of the Nanostructured Transparent n-Type Semiconductor Zr-Doped Anatase TiO₂ (Ti_1–xZr_xO₂; x < 0.3)