Preparation, characterization, and photocatalytic activity of Bi2O3–Al2O3 nanocomposite

Hakimi, Mohammad; Morvaridi, Malihe; Hosseini, Hasan Ali; Alimard, Paransa

doi:10.1016/j.poly.2019.06.029

Cited by 18 publications

(18 citation statements)

References 38 publications

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“…2a) and TEM image (Fig. 2b) [34,35]. Figure 2d shows that PNIPAM/Bi 2 O 3 turns to a uniform rodlike structure after modification and microwave continuously.…”

Section: Catalyst Characterizationmentioning

confidence: 90%

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Zhu

Song

et al. 2020

J Mater Sci

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Poly(N-isopropylacrylamide) (PNIPAM) is an organic environment-sensitive material, which can be combined with photocatalysts to control the photocatalytic process. Herein, rodlike environment-sensitive Bi 2 O 3 (PNIPAM/Bi 2 O 3 ) was prepared by a novel one-step continuous microwave method. This new method is efficient and convenient. The as-prepared PNIPAM/Bi 2 O 3 was very sensitive to temperature and pH, and the degradation rate in the environment of 25°C and pH = 9 was 3.87 times than that in the environment of 45°C and pH = 5. While Bi 2 O 3 is under the above various environmental conditions, its degradation rate did not change obviously. More interestingly, the introduction of PNIPAM and one-step continuous microwave method was beneficial to the transformation of Bi 2 O 3 from no specific shape to rodlike morphology without changing its crystal structure. This work not only developed a new one-step continuous microwave synthesis method, but also opened up new ideas for the controllability requirements of materials in special environment.

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“…2a) and TEM image (Fig. 2b) [34,35]. Figure 2d shows that PNIPAM/Bi 2 O 3 turns to a uniform rodlike structure after modification and microwave continuously.…”

Section: Catalyst Characterizationmentioning

confidence: 90%

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Zhu

Song

et al. 2020

J Mater Sci

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“…Due to the massive surface area of γ and α-Al 2 O 3 for most photocatalytic reactions, they are considered as the strongest absorber [23]. There are various metal oxides are incorporated together with Al 2 O 3 such as V 2 O 5 , Fe 2 O 3 , Ga 2 O 3 , Bi 2 O 3 , etc., to enhance the photocatalytic performance for removing disparate hazardous dyes [24][25][26]. The mechanism during electrochemical degradation of neutral red using PbO 2 /α-Al 2 O 3 composite was studied by Yao et al [27].…”

Section: Introductionmentioning

confidence: 99%

Controlling the Structural Properties and Optical Bandgap of PbO–Al2O3 Nanocomposites for Enhanced Photodegradation of Methylene Blue

et al. 2022

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In the present work, PbO-x wt% Al2O3 nanocomposites (where x = 0, 10, 20, 30, 40, 50, 60, 70, and 100 wt%) were prepared by a microwave irradiation method. Their structural parameters, morphology, and chemical bonds, were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR). It was noticed that the produced phases have an orthorhombic crystal structure and the smaller average crystallite sizes were formed when the ratio of Al2O3 is 40 wt%. The FTIR analysis reveals the formation of various bonds between Al or Pb and O. The TEM analysis reveals that the PbO-x%Al2O3 composites (x = 20, 40, and 60), composed of dense particles, and their size are smaller compared to the pure Al2O3 sample. The optical bandgap obeys the direct allowed transition and decreases from 4.83 eV to 4.35 eV as the PbO ratio in the composites increases from 0 to 100%. The intensity of the photoluminescence emission, at the same wavelength, increases as the PbO ratio increases from 0% to 60% implying that increasing the PbO content increases the capacity of free carriers within the trap centers. The prepared composites are used as a catalyst to remove the methylene blue (MB) from the wasted water under UV-visible or visible light irradiations. The photocatalytic degradation of MB was investigated by applying various kinetic models. It was found that the PbO-30% Al2O3, and PbO-40% Al2O3 composites are the best ones amongst other compositions. Furthermore, the pseudo-second-order model is the best model for describing the deterioration mechanism among the models studied. The formed composites could be suitable for the degradation of organic dyes for water purification as well as applications that required a higher optical bandgap.

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“…In this context, graphene must be mentioned as the most famous 2D material with its outstanding properties such as high charge carrier mobility [1, 3] and thermal conductivity [4] . While these properties suggest graphene as high‐end material for electronics and other applications, for example, in biotechnology, [5] insufficient options to tune its band gap [6–8] and to control structural defects [9, 10] are limiting industrial applications. Inspired by the success of graphene, an enormous interest in the research of further 2D materials has been triggered.…”

Section: Introductionmentioning

confidence: 99%

Freestanding Nanolayers of a Wide‐Gap Topological Insulator through Liquid‐Phase Exfoliation

Anh

Potapov

Wolf

et al. 2020

Chemistry A European J

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The layered salt Bi14Rh3I9 is a weak three‐dimensional (3D) topological insulator (TI), that is, a stack of two‐dimensional (2D) TIs. It has a wide non‐trivial band gap of 210 meV, which is generated by strong spin‐orbit coupling, and possesses protected electronic edge‐states. In the structure, charged layers of (Bi4Rh)3I]2+ honeycombs and Bi2I8]2− chains alternate. The non‐trivial topology of Bi14Rh3I9 is an inherent property of the 2D intermetallic fragment. Here, the exfoliation of Bi14Rh3I9 was performed using two different chemical approaches: (a) through a reaction with n‐butyllithium and poly(vinylpyrrolidone), (b) through a reaction with betaine in dimethylformamide at 55 °C. The former yielded few‐layer sheets of the new compound Bi12Rh3I, while the latter led to crystalline sheets of Bi14Rh3I9 with a thickness down to 5 nm and edge‐lengths up to several ten microns. X‐ray diffraction and electron microscopy proved that the structure of Bi14Rh3I9 remained intact. Thus, it was assumed that the particles are still TIs. Dispersions of these flakes now allow for next steps towards the envisioned applications in nanoelectronics, such as the study of quantum coherence in deposited films, the combination with superconducting particles or films for the generation of Majorana fermions, or studies on their behavior under the influence of magnetic or electric fields or in contact with various materials occurring in devices. The method presented generally allows to exfoliate layers with high specific charges and thus the use of layered starting materials beyond van der Waals crystals.

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Preparation, characterization, and photocatalytic activity of Bi2O3–Al2O3 nanocomposite

Cited by 18 publications

References 38 publications

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Continuous microwave synthesis of Bi2O3 rods coated with a temperature-sensitive polymer

Controlling the Structural Properties and Optical Bandgap of PbO–Al2O3 Nanocomposites for Enhanced Photodegradation of Methylene Blue

Freestanding Nanolayers of a Wide‐Gap Topological Insulator through Liquid‐Phase Exfoliation

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