TiO2@g-C3N4 core/shell spheres with uniform mesoporous structures for high performance visible-light photocatalytic application

Xia, Yi; Xu, Lei; Peng, Jinghui; Han, Jiazheng; Guo, Shenghui; Zhang, Libo; Han, Zhaohui; Komarneni, Sridhar

doi:10.1016/j.ceramint.2019.06.118

Cited by 34 publications

(8 citation statements)

References 45 publications

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“…23 Considering that visible light occupies about 43% of sunlight reaching the earth surface, expanding the response of TiO 2 from UV to the visible region by compounding with narrow band gap semiconductors has been studied intensively. 24,25 For example, TiO 2 has been modified with CdS, 26,27 BiOI, 28,29 MoS 2 , 30,31 g-C 3 N 4 , 32,33 Bi 2 O 3 , 34,35 Fe 2 O 3 , 36 etc. Among them, Bi 2 O 3 is a promising material to be made into a composite with TiO 2 because of its low band gap, suitable band structure, and low Fermi level at 1.73 eV (α-Bi 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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The growing world population is closely associated with the increased demand of safe drinking water and sustainable energy production. This drives the focus of the scientific community to work toward water remediation and clean energy generation. The combination of photoelectrooxidation of pollutants at the anode with simultaneous hydrogen gas production at the cathode is a smart strategy to address these problems. Herein, we have designed a bifunctional photoelectrocatalytic system consisting of a self-standing photoanode to degrade the water pollutant molecules with simultaneous production of molecular hydrogen at the cathode. The photoanode was prepared by coating Bi2O3 over the surface of self-standing TiO2 nanorods. Thus, prepared photoelectrodes show high degradation efficiency for rhodamine molecules, where direct oxidation of rhodamine by the holes generated under solar light illumination was detrimental for its activity. During simultaneous pollutant removal and energy production experiments, the anode shows 100% degradation of pollutant molecules while the cathode shows high hydrogen gas production (128 mM cm–2 h–1). The prepared composite showed higher efficiency of visible-light absorbance, high charge generation capability, and low charge transfer resistance at the interface as determined via several characterizations, compared to the bare titania. The catalyst is easy to prepare and robust in activity for several kinds of pollutant molecules tested. Its robust activity, high stability, and durability open up an avenue for the wastewater treatment with simultaneous renewable energy production technologies.

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Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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“…It is also noticeable that RhB degradation efficiency for this composite is about 2.1 times higher than that of pristine ZnO [473]. Apart from g-C3N4-ZnO heterojunction, g-C3N4-TiO2 heterojunction has high capability in the RhB degradation [474][475][476][477]. In these composites, • O2 − played a major role while h + played a minor role [478][479][480].…”

Section: Photodegradation Of Organic Pollutantsmentioning

confidence: 83%

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

2022

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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

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“…Mesoporous TiO 2 /g-C 3 N 4 composite was fabricated by Zhang et al had about 50 times the removal rate of enrofloxacin than pure g-C 3 N 4 , which attribute to the O–Ti–N bond interface heterojunction between TiO 2 and g-C 3 N 4 separated and transferred charge carriers efficiently [ 21 ]. To enhance TiO 2 light response, a uniform mesopore TiO 2 /g-C 3 N 4 composite with core/shell heterojunction structure was prepared by Xia et al, and the uniform mesoporous g-C 3 N 4 nanosheets were used to decorate TiO 2 spheres [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

Zhu

Chen²,

Wang

et al. 2022

Materials

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Different TiO2/g-C3N4 (TCN) composites were synthesized by a simple pyrolysis method with TiO2 xerogel and urea. The structure and physicochemical properties of TCN were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, ultraviolet-visible diffuse reflectance spectrum, X-ray photoelectron spectroscopy, N2-adsorption isotherms and electrochemical impedance spectroscopy. Aniline Aerofloat was chosen as a typical degradation-resistant contaminant to investigate the photodegradation activity of TCN under UV irradiation. The results indicated that TCN had higher light absorption intensity, larger specific surface area and smaller particle size compared to pure TiO2. Furthermore, TCN had great recycling photocatalytic stability for the photodegradation of Aniline Aerofloat. The photocatalytic activity depends on the synergistic reaction between holes (h+) and hydroxyl radicals (·OH). Meanwhile, the direct Z-scheme heterojunction structure of TiO2 and g-C3N4 postpones the recombination of h+ and electrons to enhance UV-light photocatalytic activity.

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TiO2@g-C3N4 core/shell spheres with uniform mesoporous structures for high performance visible-light photocatalytic application

Cited by 34 publications

References 45 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

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TiO2@g-C3N4 core/shell spheres with uniform mesoporous structures for high performance visible-light photocatalytic application

Cited by 34 publications

References 45 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

Facile Synthesis with TiO2 Xerogel and Urea Enhanced Aniline Aerofloat Degradation Performance of Direct Z-Scheme Heterojunction TiO2/g-C3N4 Composite

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Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays