Phase control synthesis of α, β and α/β Bi2O3 hetero-junction with enhanced and synergistic photocatalytic activity on degradation of toxic dye, Rhodamine-B under natural sunlight

Bera, Kamal Kanti; Majumdar, Rituparna; Chakraborty, Malay; Bhattacharya, Swapan Kumar

doi:10.1016/j.jhazmat.2018.03.029

Cited by 177 publications

(44 citation statements)

References 68 publications

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“…In recent years, bismuth-based semiconductor photocatalysts have been extensively studied because of their excellent capabilities to photocatalytically degrade organic dyes [12][13][14][15][16][17]. Particularly, a great deal of recent interest has been paid to bismuth oxyhalides BiOX (X = I, Cl, Br), which are an important class of bismuth-based semiconductor photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4 reduction method. By varying the NaBH4 concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4 concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4 solution treatment. At low-concentration NaBH4 solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4 solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3 nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4 treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.

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Section: Introductionmentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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“…Based on the above results, it can be reasonably concluded that the outstanding photocatalytic activity of the β/α-Bi 2 O 3 (A) and β/α-Bi 2 O 3 (B) samples mainly derives from the existence of the β/α-Bi 2 O 3 heterophase junction by suppressing the charge recombination and enhancing the charge transfer in photocatalysis (Figure 3d, Figure S2). [43][44][45][46] Besides, the porous structure in the β/α-Bi 2 O 3 (A) and β/α-Bi 2 O 3 (B) samples is beneficial to the photocatalytic reaction by enhancing the reactive areas and thus increasing the reactive sites. Another reason for the enhancement of the photocatalytic activity in the β/α-Bi 2 O 3 (A) and β/α-Bi 2 O 3 (B) samples can be ascribed to their unique hierarchical structure, which enhances the light absorption.…”

Section: Resultsmentioning

confidence: 99%

Self‐templated Constructing of Heterophase Junction into Hierarchical Porous Structure of Semiconductors for Promoting Photogenerated Charge Separation

Zhang

Liang

et al. 2020

ChemCatChem

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It is well‐known that photogenerated charge separation is the key and bottleneck step to determine the solar energy efficiency in photocatalysis. Although strategies for facilitating spatial charge separation of semiconductor‐based photocatalysts like heterojunctions, especially for heterophase junctions have been recognized as useful and adequate approaches, the original morphology‐tailored structures are always challenging to be maintained during the thermal‐induced phase transformation process. Herein, using a facile self‐templated method, we successfully fabricate heterophase junction into the well‐defined hierarchical porous structure of visible‐light‐responsive semiconductor, bismuth oxide (Bi2O3), without destroying the its unique hierarchical porous morphology. Such organic integration of heterophase junction and hierarchical porous structure are demonstrated to enable highly efficient separation of photogenerated electrons and holes, resulting in a remarkable enhancement in photocatalytic activities. Our work showcases a general concept for developing artificial photocatalyst systems via integrating efficient charge separation path into the unique morphology‐tailoring of semiconductors for highly efficient solar energy conversion.

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“…Based on these, they pointed out the mechanism of the charge transfer and the separation on the interface of α-/γ-Bi2O3. Bera et al [147] and Shi et al [59] also successfully synthesized the α/β-Bi2O3 homojunction photocatalyst with the use of novel solvothermal-calcination or one-pot hydrothermal methods. Correspondingly, the material exhibited exceptional and synergistic photocatalytic activity and a fairly stable performance for the removal of 17α-ethinylestradiol and rhodamine B from aqueous solutions.…”

Section: Soft-chemical-route-induced Phase Junctionsmentioning

confidence: 99%

Review on heterophase/homophase junctions for efficient photocatalysis: The case of phase transition construction

Yang

et al. 2019

Chinese Journal of Catalysis

104

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Phase control synthesis of α, β and α/β Bi2O3 hetero-junction with enhanced and synergistic photocatalytic activity on degradation of toxic dye, Rhodamine-B under natural sunlight

Cited by 177 publications

References 68 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Self‐templated Constructing of Heterophase Junction into Hierarchical Porous Structure of Semiconductors for Promoting Photogenerated Charge Separation

Review on heterophase/homophase junctions for efficient photocatalysis: The case of phase transition construction

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