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Catalysts
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Nanostructures for Photochemical Transformation Applications
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Nanostructures for Photochemical Transformation Applications

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Photocatalysis".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 9941

Special Issue Editor

Dr. Hemraj M Yadav

E-Mail Website
Guest Editor
Department of Energy and Materials Engineering, ​Dongguk University, Seoul, Republic of Korea
Interests: nanomaterials; photocatalysis; sensors; DSSC; supercapacitors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Photocatalysis is a greener approach to transform abundantly available free photonic energy into valuable chemical energy. Nanotechnology offers the facility to researchers to tune the properties of materials by controlling their size and structures. Nanostructures such as nanoparticles, nanotube, nanofibers, thin films, nanoflakes, nanocorals, etc., with their high surface-to-volume ratio, have been highly explored as photocatalysts and effectively utilized in a wide range of applications from air and water purifications to water splitting, surface disinfection, and photochemical transformations.

This Special Issue on “Nanostructures for Photocatalytic Transformation Applications” covers the synthesis, characterization, and photochemical transformations of various photoactive nanostructures and their composites. We invite authors to contribute their original research articles as well as review articles for photochemical transformations and environmental remediation applications.

Dr. Hemraj M Yadav
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 submissions that pass pre-check are 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. Catalysts 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 2700 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

  • Nanomaterials
  • Self-cleaning
  • Photocatalytic antibacterial activity
  • Advanced oxidation process
  • Heterogeneous catalysis
  • Environmental remediation
  • Photochemical transformations
  • Photocatalyst for biomedical applications
  • Photocatalyst for industrial applications

Published Papers (3 papers)

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Research

17 pages, 4890 KiB  
Article
Synthesis of Ni- and N-Doped Titania Nanotube Arrays for Photocatalytic Hydrogen Production from Glycerol–Water Solutions
by Tiur Elysabeth, Dwi Annisa Agriyfani, Muhammad Ibadurrohman, Muhammad Nurdin and Slamet
Catalysts 2020, 10(11), 1234; https://doi.org/10.3390/catal10111234 - 25 Oct 2020
Cited by 13 | Viewed by 2133
Abstract
Synthesis of Ni- and N-doped Titania Nanotube Arrays (Ni-N-TiNTAs) was conducted to produce photocatalysts for hydrogen production from a glycerol–water mixture. Ni-N-TiNTAs were synthesized in two steps, namely anodization and chemical reduction. Ti foil was anodized at 50 V for two h in [...] Read more.
Synthesis of Ni- and N-doped Titania Nanotube Arrays (Ni-N-TiNTAs) was conducted to produce photocatalysts for hydrogen production from a glycerol–water mixture. Ni-N-TiNTAs were synthesized in two steps, namely anodization and chemical reduction. Ti foil was anodized at 50 V for two h in an electrolyte solution containing 0.2% urea as a source of N atoms. Ni doping (at various content of 5%, 10%, 15%, and 20% wt) was performed by one-hour chemical reduction with sodium borohydride as a reducing agent. The photocatalyst was annealed at different temperatures, i.e., 500 °C, 550 °C, and 600 °C under 60 mL/min N2 gas for two h. On the basis of X-ray Diffraction (XRD) patterns, Ni-N-TiNTAs are mostly of anatase crystallite phase when annealed at 500 °C and 550 °C, while that of rutile was observable when calcination was done at 600 °C. The morphology of the photocatalysts was scrutinized by means of Field Emission Scanning Electron Microscopy (FESEM) imaging, which reveals nanotubular structures, with elemental composition measured by Energy Dispersive X-ray (EDX). The bandgap of the photocatalysts was analyzed using Ultraviolet Diffuse Reflectance Spectroscopy (UV DRS), which showed a lower value for the case of Ni-N-TiNTAs as compared to those of TiNTAs and N-TiNTAs. Photocatalytic tests showed that the highest amount of hydrogen produced (ca. 30973 μmol/m2) was obtained in the case of Ni-N-TiNTAs with a Ni content of 10wt%. Full article
(This article belongs to the Special Issue Nanostructures for Photochemical Transformation Applications)
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14 pages, 5538 KiB  
Article
(002) Oriented Bi2O2CO3 Nanosheets with Enhanced Photocatalytic Performance for Toluene Removal in Air
by Junping Ding, Huanchun Wang, Yidong Luo, Yushuai Xu, Jinsheng Liu and Yuanhua Lin
Catalysts 2020, 10(4), 389; https://doi.org/10.3390/catal10040389 - 2 Apr 2020
Cited by 16 | Viewed by 2521
Abstract
Layer-structured Bi2O2CO3 is a novel photocatalyst for eliminating environmental pollutants. In this work, Bi2O2CO3 nanosheets were synthesized by hydrothermal methods, followed by annealing in nitrogen. (002) oriented Bi2O2CO3 [...] Read more.
Layer-structured Bi2O2CO3 is a novel photocatalyst for eliminating environmental pollutants. In this work, Bi2O2CO3 nanosheets were synthesized by hydrothermal methods, followed by annealing in nitrogen. (002) oriented Bi2O2CO3 nanosheets were obtained and characterized by XRD, SEM, XPS, BET and UV-Vis diffuse reflectance spectra. Photocatalytic properties were investigated by toluene removal in air, with the assistant of Bi2O2CO3 nanosheets under artificial irradiation. Our results show that Bi2O2CO3 annealed in nitrogen exhibited high full-light-driven photocatalytic activity for toluene photocatalytic decomposition, which may be ascribed to facet orientation evolution during the annealing process and enhanced efficient charge separation. The sample annealed at 150 °C for 8 h (BOC-150-8 h) showed high stability and the highest toluene removal rate, which was up to 99%. The final degradation products were detected by gas chromatography–mass spectrometer (GC-MS) and CO2 was verified to be the primary product. Photocatalytic mineralization of toluene in air over Bi2O2CO3 was proposed. This work may provide a foundation for application of annealed Bi2O2CO3 in indoor air purification. Full article
(This article belongs to the Special Issue Nanostructures for Photochemical Transformation Applications)
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14 pages, 5623 KiB  
Article
Congo Red Dye Degradation by Graphene Nanoplatelets/Doped Bismuth Ferrite Nanoparticle Hybrid Catalysts under Dark and Light Conditions
by Sabeen Fatima, S. Irfan Ali, Muhammad Z. Iqbal and Syed Rizwan
Catalysts 2020, 10(4), 367; https://doi.org/10.3390/catal10040367 - 30 Mar 2020
Cited by 37 | Viewed by 4215
Abstract
The continuously growing need for clean water has increased research looking for new and efficient ways to treat wastewater. Due to its magnetic properties, Bismuth ferrite, a photo-catalyst, has introduced a novel field of photo-catalysis where the photo-catalytic material could easily be separated [...] Read more.
The continuously growing need for clean water has increased research looking for new and efficient ways to treat wastewater. Due to its magnetic properties, Bismuth ferrite, a photo-catalyst, has introduced a novel field of photo-catalysis where the photo-catalytic material could easily be separated from the aqueous solution after wastewater treatment. Herein, a new type of photo-catalysts, composed of Gadolinium (Gd) and Tin (Sn), co-doped Bismuth Ferrite deposited over graphene nanoplatelet surface have been synthesized using a two-step method. In first step, Gd (fixed concentration 10%) and Sn (5%, 15%, 20% and 25%) were doped inside bismuth ferrite (BFO) host using sol-gel method (namely the BGFSO nanoparticles, abbreviated for Gd and Sn doped BFO). In the second step, BGFSO nanoparticles were introduced onto GNPs using co-precipitation method (namely the BGFSO/GNP nanohybrids). The x-ray photoelectron spectroscopy confirmed the chemical bonding between co-doped BFO and GNP sheets via oxy and hydroxyl groups. The photocatalytic activities of the nanohybrids under both, visible light and dark conditions have been increased, and the maximum degradation activity (74%) of organic dye Congo-red (CR) is obtained for 25% Sn-doped BGFSO/GNP nanohybrid. The photocatalytic activity may be attributed to enhanced adsorption capability, electron storage properties of graphene and the presence of oxygen-rich species inside nanohybrids. Based on the current overgrowing population and need for clean water, these materials present versatile potential as catalysts for wastewater treatment. Full article
(This article belongs to the Special Issue Nanostructures for Photochemical Transformation Applications)
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