Special Issue "Nanostructures for Photocatalysis"

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A:Physics".

Deadline for manuscript submissions: closed (20 April 2019)

Special Issue Editor

Guest Editor
Professor Paolo Ciambelli

Emeritus professor of University of Salerno and CEO of Narrando Srl, via Giovanni Paolo II, 132, 84084 Fisciano, Italy
Website 1 | Website 2 | E-Mail
Phone: +39-089964151/+39-3207979006
Interests: heterogeneous catalysis; nano materials; nanotechnology: photocatalysis

Special Issue Information

Dear Colleagues,

This Special Issue,  “Nanostructures for Photocatalysis”, aims at contributing to assess the state-of-the-art of breakthroughs in novel photocatalytic materials, brought about from the continuing progress of advanced nanoscience and nanotechnology in recent years. Specifically, nanostructured-controlled photocatalysts are the subject of this issue. Therefore, with respect to usual semiconductor materials, mostly titania-based, new materials, such as metal oxides, metal organic framework, metal complexes, and porous materials add to the list of candidates for photocatalytic applications, profiting from potential high performance related to their specific nanostructures.

All aspects involved in the development of novel photocatalysts, from synthesis to characterization, to reactions applications, will be considered, but specific attention will be given to new opportunities given by the extraordinary progress in nanoscience and nanotechnology, applied to catalyst formulation, the role of advanced spectroscopic diagnostic applied to catalyst nano structure characterization, and the available kinetic approaches to give evidence to the role of nanostructure in affecting the reaction mechanisms.

Moreover, major attention will be devoted to the performance of nanostructured photocatalysts under visible light irradiation.

Finally,with respect to application of nano structured photocatalysts, this Special Issue will give space, not only to the more usual field of air and water depolluting, but also to appealing area, such as selective organic synthesis and water and carbon dioxide conversion for energy purposes.

Professor Paolo Ciambelli
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Photocatalysis
  • Nanostructured catalysts
  • Semiconductor and beyond semiconductor photocatalysts
  • Advanced synthesis of nano catalysts
  • Advanced characterization techniques for nano catalysts
  • Nanostructured photocatalysts for energy and environment application
  • Nanostructure driven photocatalytic reactions

Published Papers (4 papers)

View options order results:
result details:
Displaying articles 1-4
Export citation of selected articles as:

Research

Jump to: Review

Open AccessFeature PaperArticle
Enhanced Photocatalytic Performance and Mechanism of [email protected]3 Composites with Au Nanoparticles Assembled on CaTiO3 Nanocuboids
Micromachines 2019, 10(4), 254; https://doi.org/10.3390/mi10040254
Received: 23 March 2019 / Revised: 5 April 2019 / Accepted: 15 April 2019 / Published: 17 April 2019
Cited by 2 | PDF Full-text (22489 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Using P25 as the titanium source and based on a hydrothermal route, we have synthesized CaTiO3 nanocuboids (NCs) with the width of 0.3–0.5 μm and length of 0.8–1.1 μm, and systematically investigated their growth process. Au nanoparticles (NPs) of 3–7 nm in [...] Read more.
Using P25 as the titanium source and based on a hydrothermal route, we have synthesized CaTiO3 nanocuboids (NCs) with the width of 0.3–0.5 μm and length of 0.8–1.1 μm, and systematically investigated their growth process. Au nanoparticles (NPs) of 3–7 nm in size were assembled on the surface of CaTiO3 NCs via a photocatalytic reduction method to achieve excellent [email protected]3 composite photocatalysts. Various techniques were used to characterize the as-prepared samples, including X-ray powder diffraction (XRD), scanning/transmission electron microscopy (SEM/TEM), diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Rhodamine B (RhB) in aqueous solution was chosen as the model pollutant to assess the photocatalytic performance of the samples separately under simulated-sunlight, ultraviolet (UV) and visible-light irradiation. Under irradiation of all kinds of light sources, the [email protected]3 composites, particularly the 4.3%[email protected]3 composite, exhibit greatly enhanced photocatalytic performance when compared with bare CaTiO3 NCs. The main roles of Au NPs in the enhanced photocatalytic mechanism of the [email protected]3 composites manifest in the following aspects: (1) Au NPs act as excellent electron sinks to capture the photoexcited electrons in CaTiO3, thus leading to an efficient separation of photoexcited electron/hole pairs in CaTiO3; (2) the electromagnetic field caused by localized surface plasmon resonance (LSPR) of Au NPs could facilitate the generation and separation of electron/hole pairs in CaTiO3; and (3) the LSPR-induced electrons in Au NPs could take part in the photocatalytic reactions. Full article
(This article belongs to the Special Issue Nanostructures for Photocatalysis)
Figures

Figure 1

Open AccessArticle
Growth Process and CQDs-modified Bi4Ti3O12 Square Plates with Enhanced Photocatalytic Performance
Micromachines 2019, 10(1), 66; https://doi.org/10.3390/mi10010066
Received: 27 December 2018 / Revised: 9 January 2019 / Accepted: 16 January 2019 / Published: 18 January 2019
Cited by 13 | PDF Full-text (7708 KB) | HTML Full-text | XML Full-text
Abstract
Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4 [...] Read more.
Bi4Ti3O12 square plates were synthesized via a hydrothermal route, and their growth process was systematically investigated. Carbon quantum dots (CQDs) were prepared using glucose as the carbon source, which were then assembled on the surface of Bi4Ti3O12 square plates via a hydrothermal route with the aim of enhancing the photocatalytic performance. XRD (X-ray powder diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), UV-vis DRS (diffuse reflectance spectroscopy), XPS (X-ray photoelectron spectroscopy), FTIR (Fourier transform infrared spectroscopy), PL (photoluminescence) spectroscopy, EIS (electrochemical impedance spectroscopy) and photocurrent spectroscopy were used to systematically characterize the as-prepared samples. It is demonstrated that the decoration of CQDs on Bi4Ti3O12 plates leads to an increased visible light absorption, slightly increased bandgap, increased photocurrent density, decreased charge-transfer resistance, and decreased PL intensity. Simulated sunlight and visible light were separately used as a light source to evaluate the photocatalytic activity of the samples toward the degradation of RhB in aqueous solution. Under both simulated sunlight and visible light irradiation, [email protected]4Ti3O12 composites with an appropriate amount of CQDs exhibit obviously enhanced photocatalytic performance. However, the decoration of excessive CQDs gives rise to a decrease in the photocatalytic activity. The enhanced photocatalytic activity of CQDs-modified Bi4Ti3O12 can be attributed to the following reasons: (1) The electron transfer between Bi4Ti3O12 and CQDs promotes an efficient separation of photogenerated electron/hole pairs in Bi4Ti3O12; (2) the up-conversion photoluminescence emitted from CQDs could induce the generation of additional electron/hole pairs in Bi4Ti3O12; and (3) the photoexcited electrons in CQDs could participate in the photocatalytic reactions. Full article
(This article belongs to the Special Issue Nanostructures for Photocatalysis)
Figures

Figure 1

Open AccessArticle
Construction of Z-Scheme g-C3N4/CNT/Bi2Fe4O9 Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation
Micromachines 2018, 9(12), 613; https://doi.org/10.3390/mi9120613
Received: 23 October 2018 / Revised: 10 November 2018 / Accepted: 20 November 2018 / Published: 22 November 2018
Cited by 19 | PDF Full-text (9455 KB) | HTML Full-text | XML Full-text
Abstract
In this work, ternary all-solid-state Z-scheme g-C3N4/carbon nanotubes/Bi2Fe4O9 (g-C3N4/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in [...] Read more.
In this work, ternary all-solid-state Z-scheme g-C3N4/carbon nanotubes/Bi2Fe4O9 (g-C3N4/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C3N4/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C3N4/BFO composites. The effect of the CNT content on the photocatalytic performance of the ternary composites was investigated. The photocatalytic mechanism of g-C3N4/CNT/BFO was proposed according to the photoelectrochemical measurement, photoluminescence, active species trapping experiment and energy-band potential analysis. The results reveal that the introduction of CNT as an excellent solid electron mediator into the ternary composites can effectively accelerate the electron migration between BFO and g-C3N4. This charge transfer process results in highly-efficient separation of photogenerated charges, thus leading to greatly enhanced photocatalytic activity of g-C3N4/CNT/BFO composites. Furthermore, the g-C3N4/CNT/BFO composites also exhibit highly-efficient photo-Fenton-like catalysis property. Full article
(This article belongs to the Special Issue Nanostructures for Photocatalysis)
Figures

Figure 1

Review

Jump to: Research

Open AccessReview
TiO2 Based Nanostructures for Photocatalytic CO2 Conversion to Valuable Chemicals
Micromachines 2019, 10(5), 326; https://doi.org/10.3390/mi10050326
Received: 20 April 2019 / Revised: 1 May 2019 / Accepted: 8 May 2019 / Published: 15 May 2019
PDF Full-text (4775 KB) | HTML Full-text | XML Full-text
Abstract
Photocatalytic conversion of CO2 to useful products is an alluring approach for acquiring the two-fold benefits of normalizing excess atmospheric CO2 levels and the production of solar chemicals/fuels. Therefore, photocatalytic materials are continuously being developed with enhanced performance in accordance with [...] Read more.
Photocatalytic conversion of CO2 to useful products is an alluring approach for acquiring the two-fold benefits of normalizing excess atmospheric CO2 levels and the production of solar chemicals/fuels. Therefore, photocatalytic materials are continuously being developed with enhanced performance in accordance with their respective domains. In recent years, nanostructured photocatalysts such as one dimensional (1-D), two dimensional (2-D) and three dimensional (3-D)/hierarchical have been a subject of great importance because of their explicit advantages over 0-D photocatalysts, including high surface areas, effective charge separation, directional charge transport, and light trapping/scattering effects. Furthermore, the strategy of doping (metals and non-metals), as well as coupling with a secondary material (noble metals, another semiconductor material, graphene, etc.), of nanostructured photocatalysts has resulted in an amplified photocatalytic performance. In the present review article, various titanium dioxide (TiO2)-based nanostructured photocatalysts are briefly overviewed with respect to their application in photocatalytic CO2 conversion to value-added chemicals. This review primarily focuses on the latest developments in TiO2-based nanostructures, specifically 1-D (TiO2 nanotubes, nanorods, nanowires, nanobelts etc.) and 2-D (TiO2 nanosheets, nanolayers), and the reaction conditions and analysis of key parameters and their role in the up-grading and augmentation of photocatalytic performance. Moreover, TiO2-based 3-D and/or hierarchical nanostructures for CO2 conversions are also briefly scrutinized, as they exhibit excellent performance based on the special nanostructure framework, and can be an exemplary photocatalyst architecture demonstrating an admirable performance in the near future. Full article
(This article belongs to the Special Issue Nanostructures for Photocatalysis)
Figures

Graphical abstract

Micromachines EISSN 2072-666X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top