Enhanced photocatalytic degradation of methyl orange by gamma Bi2O3 and its kinetics

Iyyapushpam, S.; Nishanthi, S.T.; Padiyan, D. Pathinettam

doi:10.1016/j.jallcom.2014.02.142

Cited by 43 publications

(35 citation statements)

References 13 publications

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“…Iyyapushpam et al [14] reported similar results, unfortunately no pH values were reported in their study. Later, Iyyapushpam et al [15] reported the presence of γ-Bi2O3 using NH4OH at pH 9.6 Figure 3. White product synthesized after heating the precipitate for 24 hours at 110 °C (a) using NH4OH, and (b) using NaOH respectively.…”

Section: Resultsmentioning

confidence: 95%

“…The change in color indicated the formation of Bi2O3. As bismuth oxynitrate was used as a bismuth precursor as compared to previous reports that used bismuth nitrate [14][15][16][17][18][19], the reaction chemistry (with NH4OH) is presented as follows:…”

Section: Resultsmentioning

confidence: 99%

“…The deposition method determines whether the catalyst is uniformly distributed on the support or accumulation of the oxide takes place on the areas of the support [10,11,12]. Therefore, various methods have been reported for synthesis Bi2O3 that include hydrothermal [13], direct precipitation [14][15][16][17][18][19], microwave [6,20], solution combustion [21,22], and sol gel [1]. Of all these methods, described for the synthesis of Bi2O3 particles, the precipitation method is one of the least complex and energy efficient.…”

Section: Introductionmentioning

confidence: 99%

“…Of all these methods, described for the synthesis of Bi2O3 particles, the precipitation method is one of the least complex and energy efficient. Some of the most common substances used as the precipitating agents are hydroxide [14][15][16] and ammonia/ammonium salts [14,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…NH4OH and NaOH) have an effect structural and photocatalytic properties of Bi2O3. Additionally we used bismuth oxy nitrate as a source of bismuth as compared to the commonly used bismuth nitrate [14][15][16][17][18][19]. The results suggested that the Bi2O3 synthesized using NH4OH formed α-Bi2O3, whereas the one synthesized using NaOH formed a mixture of α-Bi2O3 and γ-Bi2O3.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Astuti

Arnelli

Pardoyo

et al. 2017

Bull. Chem. React. Eng. Catal.

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Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental contaminants. In this research Bi2O3 has been synthesized by precipitation method using two different bases (NH4OH and NaOH). The samples thus obtained were then analyzed using FTIR, XRD, and SEM for surface functionalization, crystal structures and morphological differences, respectively. The Bi2O3 precipitated using NH4OH showed a flower like structure made up of individual plates having α-Bi2O3 crystal structure. The precipitate obtained using NaOH showed a honeycomb like flower structure with a mixture of both α-Bi2O3 and γ-Bi2O3 crystal structure. Degradation of methyl orange (MO) was used as a model system to test the photocatalytic activity of the bismuth oxide. The Bi2O3 synthesized using NH4OH showed superior photocatalytic degradation of methyl orange than the one synthesized using NaOH.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Astuti

Arnelli

Pardoyo

et al. 2017

Bull. Chem. React. Eng. Catal.

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Constructing the Pd/PdO/β‐Bi₂O₃ microspheres with enhanced photocatalytic activity for Bisphenol A degradation and NO removal

Rao

Zhu

Wang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Photocatalysis is one of the effective ways to solve the problem of water and gas pollution. An excellent photocatalyst should have the following advantages: efficient photocatalytic activity for gas and water pollutants, recyclable and stable characteristics, non-toxic and low-cost. Constructing heterojunctions and introducing oxygen vacancies (OVs) are two effective measures to achieve these targets. RESULTS: It is found that the 1.0% Pd/PdO/ -Bi 2 O 3 exhibits the best photocatalytic activity with an efficiency of 97.4% for Bisphenol A (BPA) degradation and 47.6% for nitric oxide (NO) removal within 30 min. The 1.0% Pd/PdO/ -Bi 2 O 3 composite shows 23.3% efficiency in the photodegradation of BPA under 595 nm monochromatic light irradiation, while -Bi 2 O 3 tends to be invalid. Moreover, the OVs promote the removal of NO without irradiation. CONCLUSION: In this work, a novel ternary Pd/PdO/ -Bi 2 O 3 material as high-performance photocatalyst for the BPA degradation and NO removal was synthesized. The presence of OVs promotes the activation of the oxygen molecule, thereby facilitating the photocatalytic process. The p-n junction of PdO/ -Bi 2 O 3 and the Schottky barrier of Pd/ -Bi2 O 3 significantly limit the recombination of photoinduced electron-hole pairs in the composite. Furthermore, an artifact in the electron spin resonance (ESR) spectrum obtained by spin trapping with 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as adducts confirms that both hydroxyl radical (•OH) and superoxide radical (•O 2 − ) species are involved in the photocatalytic process. The present work offers a new perspective for developing the composite photocatalysts with high efficiency through loading of metal nanoparticles and creating an heterojunction.

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Epitaxial Growth of 2D Ultrathin Metastable γ‐Bi₂O₃ Flakes for High Performance Ultraviolet Photodetection

Wang

et al. 2021

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Although UV photodetectors based on a few kinds of 2D wide bandgap semiconductors have been investigated, their low detection capability still hinders the practical application. [18][19] For example, wide bandgap h-BN has been developed for UV detection, but exhibits a poor performance with responsivity of 0.1 mA W −1 and detectivity of 2.4 × 10 8 Jones. [19] Therefore, it is urgent to develop 2D materials with suitable bandgap, excellent light-matter interaction and high stability for high-performance UV detection.Bi 2 O 3 is a semiconductor with many intriguing properties, such as wide bandgap, excellent light sensitivity, environmental stability, nontoxic and elemental abundance, exhibiting great potential for UV detection. [16][17][18][19][20] There are four main crystal phases for Bi 2 O 3 , including monoclinic (α), [20][21] tetragonal (β), [22] body-centered cubic (γ), [23] and face cubic (δ). [24] Among them, γ-Bi 2 O 3 is a metastable semiconductor at high temperature and has been proved to exhibit excellent performance in the fields such as photocatalysis and photoelectrochemistry. [25][26] More importantly, γ-Bi 2 O 3 possesses a relatively wide bandgap of 2.9 eV and high absorption in the UV region compared with other three phases, [23,[27][28] and thus enabling it great potential for UV detection. Currently, mostly reported γ-Bi 2 O 3 structures are synthesized via liquid-based methods which inevitably introduce various organic impurities, and meanwhile, the size is usually limited to several nanometers, hindering their large-scale application in photoelectronic devices. [23,25,27] With regards to other methods, for instance, annealing of α-Bi 2 O 3 film or thermal oxidization of Bi nanoparticles, could also obtain γ-Bi 2 O 3 structure in nanoscale. [29][30] However, the obtained samples are usually polycrystalline, of which the grain boundaries will affect its intrinsic photoelectrical performance. To the best of our knowledge, it is still challenging to obtain ultrathin 2D γ-Bi 2 O 3 flakes with high quality to meet the requirements of ideal photoelectronic devices.Chemical vapor deposition (CVD) method has been widely used for the growth of ultrathin 2D flakes with high quality and accurately controlled morphology and size of the materials. However, it is still difficult to synthesize 2D γ-Bi 2 O 3 flakes through conventional CVD methods owing to the intrinsic isotropic chemical bonds in the nonlayered γ-Bi 2 O 3 crystal structure. Besides, the mixed phase and metastable nature of γ-Bi 2 O 3 Ultraviolet detection is of great significance due to its wide applications in the missile tracking, flame detecting, pollution monitoring, and so on. The nonlayered semiconductor γ-Bi 2 O 3 is a promising candidate toward highperformance UV detection due to the wide bandgap, excellent light sensitivity, environmental stability, nontoxic and elemental abundance properties. However, controllable preparation of ultrathin 2D γ-Bi 2 O 3 flakes remains a challenge, owing to its nonlayered structure, metastable natu...

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Enhanced photocatalytic degradation of methyl orange by gamma Bi2O3 and its kinetics

Cited by 43 publications

References 13 publications

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Constructing the Pd/PdO/β‐Bi₂O₃ microspheres with enhanced photocatalytic activity for Bisphenol A degradation and NO removal

Epitaxial Growth of 2D Ultrathin Metastable γ‐Bi₂O₃ Flakes for High Performance Ultraviolet Photodetection

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Enhanced photocatalytic degradation of methyl orange by gamma Bi2O3 and its kinetics

Cited by 43 publications

References 13 publications

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Constructing the Pd/PdO/β‐Bi2O3 microspheres with enhanced photocatalytic activity for Bisphenol A degradation and NO removal

Epitaxial Growth of 2D Ultrathin Metastable γ‐Bi2O3 Flakes for High Performance Ultraviolet Photodetection

Contact Info

Product

Resources

About

Constructing the Pd/PdO/β‐Bi₂O₃ microspheres with enhanced photocatalytic activity for Bisphenol A degradation and NO removal

Epitaxial Growth of 2D Ultrathin Metastable γ‐Bi₂O₃ Flakes for High Performance Ultraviolet Photodetection