Synthesis and characterization of B-doped TiO2 and their performance for the degradation of metoprolol

Cavalcante, Rodrigo Pereira; Dantas, Renato F.; Bayarri, B.; González, Óscar Clavería; Giménez, José Carlos Moreno; Esplugas, Santiago; Machulek, Amílcar

doi:10.1016/j.cattod.2014.09.030

Cited by 72 publications

(46 citation statements)

References 58 publications

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“…Pure TiO 2 and B-, Ag-, and N-modified TiO 2 nanoparticles were synthesized from titanium(IV) isopropoxide using the sol-gel method, adapted from Cavalcante et al 12 A 19.10 mL volume of titanium(IV) isopropoxide was mixed with 16.10 mL of glacial acetic acid (molar ratio 1:4) under constant stirring until a metal acetate complex was formed. The acid acted as a chelant agent, controlling the hydrolysis process.…”

Section: Synthesis Of Catalystsmentioning

confidence: 99%

“…10,11 Heterogeneous photocatalysis using TiO 2 has received considerable attention as an AOP for photodegradation of organic pollutants in water. [12][13][14][15] Despite being a promising technology, photocatalysis with TiO 2 has disadvantages, including low degradation kinetics and a high probability of electron-hole recombination. Removal of catalysts at the end of the process is a major requirement in photocatalysis, albeit one difficult to meet, as it involves a solid-liquid separation step that adds to the overall capital and running costs in WWTPs.…”

Section: Introductionmentioning

confidence: 99%

“…Cavalcante et al 12 demonstrated a substantial improvement in TiO 2 photocatalytic efficiency by B-doping. Factors responsible for the improved performance included large surface area, mesoporous structure, anatase-rutile crystalline structure, formation of Ti III , introduction of boron as a B-O-Ti species, uniformity in particle surface size, and decreased crystal and particle sizes.…”

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confidence: 99%

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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: Synthesis Of Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…Boron-doped mp-TiO 2 (B-mp-TiO 2 ) was prepared by a sol-gel process using boric acid as a boron source [57]. Different concentrations of boron ranging from 0.25 to 9.0 (wt %) were used in the precursor solution to obtain B-mp-TiO 2 with different loadings.…”

Section: Boron Dopingmentioning

confidence: 99%

“…In addition to band gap reduction and visible light absorption, adding non-metal elements into TiO 2 may have effects on the microstructure of the material, depending on the route of introduction. In one example, boron-doped TiO 2 particles were found to have reduced size, resulting in higher surface area and suppressed phase transformation, and improved photogenerated charge separation, which significantly contributes to the photocatalytic performance of titania [57]. To further improve the visible light driven photocatalytic activity of TiO2, binary and ternary codoping of two non-metal elements such as N-B and N-C has been studied [21,[46][47][48][49][50][51][52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

et al. 2017

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Mesoporous titania (mp-TiO 2 ) has drawn tremendous attention for a diverse set of applications due to its high surface area, interfacial structure, and tunable combination of pore size, pore orientation, wall thickness, and pore connectivity. Its pore structure facilitates rapid diffusion of reactants and charge carriers to the photocatalytically active interface of TiO 2 . However, because the large band gap of TiO 2 limits its ability to utilize visible light, non-metal doping has been extensively studied to tune the energy levels of TiO 2 . While first-principles calculations support the efficacy of this approach, it is challenging to efficiently introduce active non-metal dopants into the lattice of TiO 2 . This review surveys recent advances in the preparation of mp-TiO 2 and their doping with non-metal atoms. Different doping strategies and dopant sources are discussed. Further, co-doping with combinations of non-metal dopants are discussed as strategies to reduce the band gap, improve photogenerated charge separation, and enhance visible light absorption. The improvements resulting from each doping strategy are discussed in light of potential changes in mesoporous architecture, dopant composition and chemical state, extent of band gap reduction, and improvement in photocatalytic activities. Finally, potential applications of non-metal-doped mp-TiO 2 are explored in water splitting, CO 2 reduction, and environmental remediation with visible light.

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Design and constructing of mutually independent crystal facet exposed TiO₂homojunction and improving synergistic effects for photoelectrochemical hydrogen generation and pollutant degradation

Liu

Song

et al. 2018

Int J Energy Res

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Summary Constructing homojunctions of same semiconductors is an effective way to promote charge separation and thus to improve the photoelectrochemical (PEC) and photocatalytic H2 generation performance, and specifically, crystal‐facet exposed homojunction is considered as a very promising structure. Herein, a mutually independent crystal facet exposed TiO2 homojunction was fabricated through a two‐step hydrothermal method with the consideration of morphology and built‐in compacted bonding interaction for PEC water splitting. The as‐prepared homojunction photocatalyst is composed of a similarly dendritic structure where the trunk is TiO2 nanobelts (NBs) array with exposed (101) facets, and the branch portion is ultrathin TiO2 nanosheets (NSs) with exposed (100) facets sequentially located on the side surface of TiO2 NBs. The one‐dimension (1‐D) TiO2 NBs provide a fast electron transfer pathway and are beneficial to the radial transmission of photo‐generated carriers. And the ultrathin TiO2 NSs with a larger surface area can increase direct contact area with electrolyte, light‐harvesting capability and then accelerate the water splitting process. Moreover, due to built‐in compacted bonding interaction between two building blocks with mutually independent exposed facets and matched band structure, this unique homojunction structure can effectively accelerate the transmission of electrons and decrease the recombination rate of the photo‐generated carriers at the interface of two building blocks, thereby increasing the separation efficiency of photo‐generated carriers and simultaneously enhancing the density of photo‐generated electrons and holes, which can be verified through the photocurrent responses and photoluminescence spectra of the as‐prepared samples. As a result, the as‐prepared TiO2 homojunction can not only increase adsorption and profoundly boost photocatalytic performance for decomposition of organic contaminants (rhodamine B), but also possess a higher PEC and photocatalytic H2 generation performance compared with TiO2 NBs. This work offers a new idea to design and fabricate highly efficient TiO2 photocathode for hydrogen generation and degradation of organic pollutants.

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Synthesis and characterization of B-doped TiO2 and their performance for the degradation of metoprolol

Cited by 72 publications

References 58 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

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

Design and constructing of mutually independent crystal facet exposed TiO₂homojunction and improving synergistic effects for photoelectrochemical hydrogen generation and pollutant degradation

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Synthesis and characterization of B-doped TiO2 and their performance for the degradation of metoprolol

Cited by 72 publications

References 58 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

Synthesis and Catalytic Applications of Non-Metal Doped Mesoporous Titania

Design and constructing of mutually independent crystal facet exposed TiO2homojunction and improving synergistic effects for photoelectrochemical hydrogen generation and pollutant degradation

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Design and constructing of mutually independent crystal facet exposed TiO₂homojunction and improving synergistic effects for photoelectrochemical hydrogen generation and pollutant degradation