Special Issue "Photocatalytic Nanomaterials"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 15 November 2019

Special Issue Editor

Guest Editor
Prof. Dr. Takuya Tsuzuki

Australian National University, College of Engineering and Computer Science, Canberra, Australia
Website | E-Mail
Phone: +61-261-259-296
Interests: nanomaterials; catalysts & photocatalysts; mechanochemistry; sustainable development; technology commercialisation

Special Issue Information

Dear Colleagues,

Photocatalysis enables the direct conversion of solar energy into chemical energy. As such, photocatalysis has been recognised as an effective tool for many sustainability-related applications. For example, photocatalytic reactions can help remove organic and inorganic pollutants from water and air. Photocatalysis is also the key technology in artificial photosynthesis to generate clean fuels in a green manner. Many strategies have been developed to improve photocatalytic efficiency in recent years, including the utilisation of new combinations of anions and cations, doping, facet engineering, and carbon-based materials. Much new knowledge has been acquired about the structure–performance relationship in photocatalysts. However, the development of effective photocatalysts and their applications remain challenging today.

This Special Issue of Nanomaterials will cover the recent advancements in photocatalytic nanomaterials, including the development of new and improved photocatalysts, advanced applications, and in-depth understanding of reaction mechanisms. This Special Issue will provide a platform for the exchange of new ideas and the latest results in the investigation of photocatalytic nanomaterials and their applications, in order to further advance this research field.

Prof. Dr. Takuya Tsuzuki
Guest Editor

Manuscript Submission Information

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Keywords

  • Photocatalysts
  • nanomaterial synthesis
  • solar energy conversion
  • solar fuel production
  • pollutant removal
  • energy
  • environment
  • self-cleaning coating
  • photocatalytic reactors

Published Papers (6 papers)

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Research

Open AccessArticle
Visible-Light-Driven Photocatalytic Activity of Magnetic BiOBr/SrFe12O19 Nanosheets
Nanomaterials 2019, 9(5), 735; https://doi.org/10.3390/nano9050735
Received: 27 April 2019 / Revised: 5 May 2019 / Accepted: 6 May 2019 / Published: 13 May 2019
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Abstract
Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using [...] Read more.
Magnetic BiOBr/SrFe12O19 nanosheets were successfully synthesized using the hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and UV-visible diffused reflectance spectra (UV-DRS), and the magnetic properties were tested using a vibration sample magnetometer (VSM). The as-produced composite with an irregular flaky-shaped aggregate possesses a good anti-demagnetization ability (Hc = 861.04 G) and a high photocatalytic efficiency. Under visible light (λ > 420 nm) and UV light-emitting diode (LED) irradiation, the photodegradation rates of Rhodamine B (RhB) using BiOBr/SrFe12O19 (5 wt %) (BOB/SFO-5) after 30 min of reaction were 97% and 98%, respectively, which were higher than that using BiOBr (87%). The degradation rate of RhB using the recovered BiOBr/5 wt % SrFe12O19 (marked as BOB/SFO-5) was still more than 85% in the fifth cycle, indicating the high stability of the composite catalyst. Meanwhile, after five cycles, the magnetic properties were still as stable as before. The radical-capture experiments proved that superoxide radicals and holes were main active species in the photocatalytic degradation of RhB. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Open AccessArticle
One-Pot Synthesis of BiCuSO Nanosheets under Ambient Atmosphere as Broadband Spectrum Photocatalyst
Nanomaterials 2019, 9(4), 540; https://doi.org/10.3390/nano9040540
Received: 20 February 2019 / Revised: 29 March 2019 / Accepted: 29 March 2019 / Published: 3 April 2019
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Abstract
Cuprous based chalcogenides have attracted intensive research interest due to the potential applications in solar energy conversion. However, typical fabrications of these compounds are often carried out under severe conditions, such as inert gas protection, high vacuum, and/or extreme high temperature. Here we [...] Read more.
Cuprous based chalcogenides have attracted intensive research interest due to the potential applications in solar energy conversion. However, typical fabrications of these compounds are often carried out under severe conditions, such as inert gas protection, high vacuum, and/or extreme high temperature. Here we reported a one-pot process for cuprous based chalcogenides synthesis in aqueous solution. A strategy for BiCuSO nanosheets fabrication without toxic chemicals or rigorous reagents at pretty low temperatures under an ambient atmosphere was established, with the practicality of morphology controlling and the compatibility of multifarious precursors. Platelike BiCuSO with a thickness range from several to hundreds nanometers are fabricated by adjusting the alkali concentration, reaction time, and temperature. The positive effect of alkali hydroxide concentration is proposed cautiously based on the experimental results. The photocatalytic activities of BiCuSO nanosheet under UV, visible, and near-infrared irradiation were also investigated. BiCuSO obtained at room temperature with a thickness of 4.5 nm showed the most impressive efficiency to decompose organic contaminants. Our research presented a new way for cuprous sulfides fabrication, and might open up a new vista for large-scale synthesis of cuprous based materials as promising broadband spectrum light-absorbing materials. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Open AccessArticle
Challenges in Determining the Location of Dopants, to Study the Influence of Metal Doping on the Photocatalytic Activities of ZnO Nanopowders
Nanomaterials 2019, 9(3), 481; https://doi.org/10.3390/nano9030481
Received: 6 March 2019 / Revised: 19 March 2019 / Accepted: 20 March 2019 / Published: 25 March 2019
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Abstract
Impurity doping is one of the common approaches to enhance the photoactivity of semiconductor nanomaterials by increasing photon-capture efficiency in the visible light range. However, many studies on the doping effects have produced inconclusive and conflicting results. There are some misleading assumptions and [...] Read more.
Impurity doping is one of the common approaches to enhance the photoactivity of semiconductor nanomaterials by increasing photon-capture efficiency in the visible light range. However, many studies on the doping effects have produced inconclusive and conflicting results. There are some misleading assumptions and errors that are frequently made in the data interpretation, which can lead to inconsistent results about the doping effects on photocatalysis. One of them is the determination of the location of dopants. Even using advanced analytical techniques, it is still challenging to distinguish between bulk modification and surface modification. The paper provides a case study of transition-metal-doped ZnO nanoparticles, whereby demonstrating common pitfalls in the interpretation of the results of widely-used analytical methods in detail, and discussing the importance of using a combination of many characterization techniques to correctly determine the location of added impurities, for elucidating the influence of metal doping on the photocatalytic activities of semiconductor nanoparticles. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Open AccessArticle
One-Step Low Temperature Hydrothermal Synthesis of Flexible TiO2/[email protected]2 Core-Shell Heterostructured Fibers for Visible-Light-Driven Photocatalysis and Self-Cleaning
Nanomaterials 2019, 9(3), 431; https://doi.org/10.3390/nano9030431
Received: 18 February 2019 / Revised: 5 March 2019 / Accepted: 8 March 2019 / Published: 14 March 2019
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Abstract
Novel flexible and recyclable core-shell heterostructured fibers based on cauliflower-like MoS2 and TiO2/PVDF fibers have been designed through one-step hydrothermal treatment based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The low hydrothermal temperature avoids the high temperature process and keeps the [...] Read more.
Novel flexible and recyclable core-shell heterostructured fibers based on cauliflower-like MoS2 and TiO2/PVDF fibers have been designed through one-step hydrothermal treatment based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The low hydrothermal temperature avoids the high temperature process and keeps the flexibility of the as-synthesized materials. The formation mechanism of the resultant product is discussed in detail. The composite of MoS2 not only expands the light harvesting window to include visible light, but also increases the separation efficiency of photo-generated electrons and holes. The as-prepared product has proven to possess excellent and stable photocatalytic activity in the degradation of Rhodamine B and levofloxacin hydrochloride under visible light irradiation. In addition, the TiO2/[email protected]2 core-shell heterostructured fibers exhibit self-cleaning property to dye droplets under visible light irradiation. Meanwhile, due to its hydrophobicity, the resultant product can automatically remove dust on its surface under the rolling condition of droplets. Hence, the as-prepared product cannot only degrade the contaminated compounds on the surface of the material, but also reduce the maintenance cost of the material due to its self-cleaning performance. Therefore, the as-prepared product possesses potential applications in degradation of organic pollutants and water treatment, which makes it a prospective material in the field of environmental treatment. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Open AccessArticle
Three-Dimensional Structure of PANI/CdS NRs-SiO2 Hydrogel for Photocatalytic Hydrogen Evolution with High Activity and Stability
Nanomaterials 2019, 9(3), 427; https://doi.org/10.3390/nano9030427
Received: 14 February 2019 / Revised: 3 March 2019 / Accepted: 5 March 2019 / Published: 13 March 2019
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Abstract
Three-dimensional PANI/CdSNRs-SiO2 hydrogel (CdS NRs-PANI-SiO2) was synthesized by loading polyaniline (PANI) onto the semiconductor CdS nanorods (NRs) surface and loading the binary complex on SiO2 gel. The structure, optical properties, and electrochemical properties of the composite were studied in [...] Read more.
Three-dimensional PANI/CdSNRs-SiO2 hydrogel (CdS NRs-PANI-SiO2) was synthesized by loading polyaniline (PANI) onto the semiconductor CdS nanorods (NRs) surface and loading the binary complex on SiO2 gel. The structure, optical properties, and electrochemical properties of the composite were studied in detail. The hydrogen production amount of CdS NRs-PANI (3%)-SiO2 (20%) increased in comparison with CdS NRs and reached 43.25 mmol/g in 3 h under visible light. The three-dimensional structure of SiO2 hydrogel increased the specific surface area of the catalyst, which was conducive to exposing more active sites of the catalyst. In addition, the conductive polymer PANI coated on CdS NRs played the role of conductive charge and effectively inhibited the photo-corrosion of CdS NRs. In addition, the recovery experiment showed that the recovery rate of the composite catalyst reached 90% and hydrogen production efficiency remained unchanged after five cycles, indicating that the composite catalyst had excellent stability. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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Open AccessArticle
Photocatalytic and Photo-Fenton Catalytic Degradation Activities of Z-Scheme Ag2S/BiFeO3 Heterojunction Composites under Visible-Light Irradiation
Nanomaterials 2019, 9(3), 399; https://doi.org/10.3390/nano9030399
Received: 25 January 2019 / Revised: 28 February 2019 / Accepted: 5 March 2019 / Published: 9 March 2019
Cited by 5 | PDF Full-text (28464 KB) | HTML Full-text | XML Full-text
Abstract
Z-scheme Ag2S/BiFeO3 heterojunction composites were successfully prepared through a precipitation method. The morphology and microstructure characterization demonstrate that Ag2S nanoparticles (30–50 nm) are well-decorated on the surfaces of polyhedral BiFeO3 particles (500–800 nm) to form Ag2 [...] Read more.
Z-scheme Ag2S/BiFeO3 heterojunction composites were successfully prepared through a precipitation method. The morphology and microstructure characterization demonstrate that Ag2S nanoparticles (30–50 nm) are well-decorated on the surfaces of polyhedral BiFeO3 particles (500–800 nm) to form Ag2S/BiFeO3 heterojunctions. The photocatalytic and photo-Fenton catalytic activities of the as-derived Ag2S/BiFeO3 heterojunction composites were evaluated by the degradation of methyl orange (MO) under visible-light irradiation. The photocatalytic result indicates that the Ag2S/BiFeO3 composites exhibit much improved photocatalytic activities when compared with bare Ag2S and BiFeO3. The optimum composite sample was observed to be 15% Ag2S/BiFeO3 with an Ag2S mass fraction of 15%. Furthermore, the addition of H2O2 can further enhance the dye degradation efficiency, which is due to the synergistic effects of photo- and Fenton catalysis. The results of photoelectrochemical and photoluminescence measurements suggest a greater separation of the photoexcited electron/hole pairs in the Ag2S/BiFeO3 composites. According to the active species trapping experiments, the photocatalytic and photo-Fenton catalytic mechanisms of the Ag2S/BiFeO3 composites were proposed and discussed. Full article
(This article belongs to the Special Issue Photocatalytic Nanomaterials)
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