Facile fabrication of heterostructured bismuth titanate nanocomposites: The effects of composition and band gap structure on the photocatalytic activity performance

Du, Yong; Hao, Qiang; Chen, Daimei; Chen, Tong; Hao, Simeng; Yang, Jinjin; Ding, Hao; Yao, Wenqing; Song, Jianhua

doi:10.1016/j.cattod.2016.12.048

Cited by 28 publications

(11 citation statements)

References 45 publications

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“…Meanwhile, a deviation exists in the literature regarding the specific surface area of the bismuth titanate pyrochlore (5.75−16.38 m 2 /g), which is caused by different annealing parameters, as well as additional processing steps (hydrothermal treatment) during coprecipitation synthesis. 32,33,38,43 Electronic Properties and Optical Absorption Spectra. The well-optimized crystal structures of BTO models were utilized for further analysis of the electronic structure and optical properties.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Our results are in line with the S BET = 13.1 m 2 /g for Bi 2 Ti 2 O 7 pyrochlore previously reported by Benčina et al due to identical synthesis methods. Meanwhile, a deviation exists in the literature regarding the specific surface area of the bismuth titanate pyrochlore (5.75–16.38 m 2 /g), which is caused by different annealing parameters, as well as additional processing steps (hydrothermal treatment) during coprecipitation synthesis. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…Bi 2 Ti 2 O 7 is a wide-band-gap semiconductor and can independently absorb visible light. Its conduction band (CB) and valence band (VB) have suitable energy levels to create efficient type heterojunction photocatalysts between Bi 2 Ti 2 O 7 and the other semiconductors (e.g., TiO 2 , Bi 4 Ti 3 O 12 , BiOCl, Bi 2 O 3 ). ,,,,− Moreover, Bi 2 Ti 2 O 7 prepared with different morphologies (nanospheres, nanorods, nanoflower-like, etc.) possesses an improvement in photoactivity. ,, One of the well-known problems of Bi 2 Ti 2 O 7 is its low thermal stability, although it is possible to obtain a pure bismuth titanate pyrochlore by soft synthetic methods (e.g., coprecipitation, hydrothermal synthesis) or to stabilize the pyrochlore phase by doping with suitable elements.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

et al. 2020

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The photocatalytic properties of Bi2–x Ti2O7–1.5x (x = 0, 0.5) pyrochlores are examined via ab initio calculations and experiments. A coprecipitation method is applied for the synthesis of nanopowder pyrochlores. The pyrochlore phase formation starts at 500 °C (Bi2Ti2O7) and 550 °C (Bi1.5Ti2O6.25). Nanopowders are found to be a metastable character of pyrochlore phases. The presence of bismuth and oxygen vacancies enhances the thermal stability of the Bi1.5Ti2O6.25 phase in comparison with the Bi2Ti2O7 phase. The estimated crystallite size is 30–40 nm with noticeable agglomerates of about 100–300 nm according to scanning electron microscopy (SEM) and with the formation of particles (510–580 nm) in the aqueous medium. The isoelectric points of the nanopowders seem to be shifted to the strongly acidic region, resulting in the formation of negative surface particle charges of −33 mV (Bi2Ti2O7) and −27 mV (Bi1.5Ti2O6.25) at pH 5.88 in distilled water. The specific surface area is 11.5 m2/g (Bi2Ti2O7) and 12.00 m2/g (Bi1.5Ti2O6.25). The use of the generalized gradient approximation (GGA) with the Perdew–Burke–Ernzerhof (PBE) functional allows achieving an excellent agreement between theoretical and experimental structural parameters. The screened Coulomb hybrid HSE03 functional is the most appropriate for describing the optoelectronic properties. Bismuth titanate pyrochlores are wide-gap semiconductors with strong abilities to be active photocatalysts under visible irradiation. The optical E g values for direct/indirect transition according to the experiment, 3.19/2.94 eV (x = 0) and 3.24/3.03 eV (x = 0.5), and the DFT/HSE03 calculations, 2.92/2.87 (x = 0) and 3.42/– eV (x = 0.5), are in the visible light region and are close. The calculated low effective masses of the charge carriers and suitable band edge positions confirm the ability of the pyrochlores to act as photocatalysts. The photocatalytic activity has been evaluated through the decomposition of rhodamine B under visible irradiation. Bi2Ti2O7 shows the highest activity in comparison with Bi1.5Ti2O6.25, which is in good agreement with theoretically predicted and experimentally revealed characteristics.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

et al. 2020

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“…Until then, various photocatalysts have been explored by researchers in the fields of materials, catalysis, energy, and chemistry, hence enabling this technology to be developed rapidly. At present, the photocatalytic technology has been demonstrated in a variety of applications for photocatalytic contaminant degradation in both liquid and air phases, − water decomposition, , CO 2 fixation, − and disinfection. , …”

Section: Introductionmentioning

confidence: 99%

Engineered Graphitic Carbon Nitride-Based Photocatalysts for Visible-Light-Driven Water Splitting: A Review

et al. 2021

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Graphitic carbon nitride (g-C 3 N 4 ), a polymeric semiconductor, has become a rising star for photocatalytic energy conversion because of its facile accessibility, metal-free nature, low cost, and environmentally benign properties. This work reviews the latest progress of g-C 3 N 4 -based materials in visible-light-driven water splitting to hydrogen. It begins with a brief history of g-C 3 N 4 , followed by various engineering strategies of g-C 3 N 4 , such as elemental doping, copolymerization, crystalline tailoring, surface engineering, and single-atom modification, for elevated photocatalytic water decomposition. In addition, the synthesis of g-C 3 N 4 in different dimensions (0D, 1D, 2D, and 3D) and configurations of a series of g-C 3 N 4based heterojunctions (type II, Z-scheme, S-scheme, g-C 3 N 4 /metal, and g-C 3 N 4 /carbon heterojunctions) were also discussed for their improvement in photocatalytic hydrogen production. Lastly, the challenges and opportunities of g-C 3 N 4 -based nanomaterials are provided. It is anticipated that this review will promote the further development of the emerging g-C 3 N 4 -based materials for more efficiency in photocatalytic water splitting to hydrogen.

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“…Energy Material Advances 460 nm. Compared with bulk CN, the PL intensity of the other samples decreased significantly, which mean the recombination of photoinduced charge carriers was obstructed, and it is helpful for the enhanced photocatalytic activity [49]. Experimental studies on NO 3 reduction have shown that Ru modified g-C 3 N 4 plays an essential role in improving NH 3 production compared with pure g-C 3 N 4 .…”

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A Green Synthesis of Ru Modified g-C ₃ N ₄ Nanosheets for Enhanced Photocatalytic Ammonia Synthesis

et al. 2021

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Nitrate is a crucial environmental pollutant, and its risk on ecosystem keeps increasing. Photocatalytic conversion of nitrate to ammonia can simultaneously achieve the commercialization of environmental hazards and recovery of valuable ammonia, which is green and sustainable for the planet. However, due to the thermodynamic and kinetic energy barriers, photocatalytic nitrate reduction usually involves a higher selectivity of the formation of nitrogen that largely limits the ammonia synthesis activity. In this work, we reported a green and facile synthesis of novel metallic ruthenium particle modified graphitic carbon nitride photocatalysts. Compare with bulk graphitic carbon nitride, the optimal sample had 2.93-fold photocatalytic nitrate reduction to ammonia activity (2.627 mg/h/gcat), and the NH3 selectivity increased from 50.77% to 77.9%. According to the experimental and calculated results, the enhanced photocatalytic performance is attributed to the stronger light absorption, nitrate adsorption, and lower energy barrier for the generation of ammonia. This work may provide a facile way to prepare metal modified photocatalysts to achieve highly efficient nitrate reduction to ammonia.

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Facile fabrication of heterostructured bismuth titanate nanocomposites: The effects of composition and band gap structure on the photocatalytic activity performance

Cited by 28 publications

References 45 publications

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Engineered Graphitic Carbon Nitride-Based Photocatalysts for Visible-Light-Driven Water Splitting: A Review

A Green Synthesis of Ru Modified g-C ₃ N ₄ Nanosheets for Enhanced Photocatalytic Ammonia Synthesis

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Facile fabrication of heterostructured bismuth titanate nanocomposites: The effects of composition and band gap structure on the photocatalytic activity performance

Cited by 28 publications

References 45 publications

Photocatalytic Properties of Bi2–xTi2O7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi2–xTi2O7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Engineered Graphitic Carbon Nitride-Based Photocatalysts for Visible-Light-Driven Water Splitting: A Review

A Green Synthesis of Ru Modified g-C 3 N 4 Nanosheets for Enhanced Photocatalytic Ammonia Synthesis

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Product

Resources

About

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

Photocatalytic Properties of Bi_2–xTi₂O_7–1.5x (x = 0, 0.5) Pyrochlores: Hybrid DFT Calculations and Experimental Study

A Green Synthesis of Ru Modified g-C ₃ N ₄ Nanosheets for Enhanced Photocatalytic Ammonia Synthesis