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Nanomaterials
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Environmental Remediation by Photocatalytic Functional Nanomaterials
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Environmental Remediation by Photocatalytic Functional Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Environmental Nanoscience and Nanotechnology".

Deadline for manuscript submissions: closed (25 October 2022) | Viewed by 7727

Special Issue Editor

Dr. Joon Ching Juan

E-Mail Website
Guest Editor
Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia
Interests: synthesis of nanostructured materials such as photocatalyst to be used for removal of organic pollutants and production of methanol via CO2 photoreduction

Special Issue Information

Dear Colleagues,

The “Environmental Remediation by Photocatalytic Functional Nanomaterials” Special Issue aims to collect articles regarding the synthesis of new nanomaterial as photocatalysts for the removal of hazardous organic pollutants in the environment, such as volatile organic compounds, dyes, antibiotics, persistent organic pollutants, emerging pollutants, etc. There are numerous attempts to produce and functionalize unique nanostructured material to activate the photocatalyst under visible light.  The preparation strategies of the functional photocatalyst, by adding metal, non-metal, carbon based, polymers, and others, are important to improve the photocatalytic activity under visible light. Therefore, this Special Issue aims to collect research on novel nanostructured photocatalysts with high performance for environment remediation. The other research pertaining to the computational modelling and development of new photoreactors will also be considered for publication. This work will be beneficial for the readers to understand the advancement in preparing various functional photocatalyst nanomaterials in environmental science.

Prof. Dr. Joon Ching Juan
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. Nanomaterials is an international peer-reviewed open access semimonthly 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 2900 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

  • Volatile organic compounds remediation
  • Organic pollutants remediation
  • Photoreactors
  • Functional photocatalysts
  • Fenton-like processes in heterogeneous
  • Photocatalysis coupled with electrochemical processes
  • Simulation and computational studies of photocatalyst

Published Papers (4 papers)

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Research

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13 pages, 2698 KiB  
Article
Influence of Cocatalysts (Ni, Co, and Cu) and Synthesis Method on the Photocatalytic Activity of Exfoliated Graphitic Carbon Nitride for Hydrogen Production
by Adeem Ghaffar Rana, Michael Schwarze, Minoo Tasbihi, Xavier Sala, Jordi García-Antón and Mirjana Minceva
Nanomaterials 2022, 12(22), 4006; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12224006 - 14 Nov 2022
Cited by 5 | Viewed by 1895
Abstract
Exfoliated graphitic carbon nitride (ex-g-CN) was synthesized and loaded with non-noble metals (Ni, Cu, and Co). The synthesized catalysts were tested for hydrogen production using a 300-W Xe lamp equipped with a 395 nm cutoff filter. A noncommercial double-walled quartz-glass reactor irradiated from [...] Read more.
Exfoliated graphitic carbon nitride (ex-g-CN) was synthesized and loaded with non-noble metals (Ni, Cu, and Co). The synthesized catalysts were tested for hydrogen production using a 300-W Xe lamp equipped with a 395 nm cutoff filter. A noncommercial double-walled quartz-glass reactor irradiated from the side was used with a 1 g/L catalyst in 20 mL of a 10 vol% triethanolamine aqueous solution. For preliminary screening, the metal-loaded ex-g-CN was synthesized using the incipient wetness impregnation method. The highest hydrogen production was observed on the Ni-loaded ex-g-CN, which was selected to assess the impact of the synthesis method on hydrogen production. Ni-loaded ex-g-CN was synthesized using different synthesis methods: incipient wetness impregnation, colloidal deposition, and precipitation deposition. The catalysts were characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption using the Brunauer–Emmett–Teller method, and transmission electron microscopy. The Ni-loaded ex-g-CN synthesized using the colloidal method performed best with a hydrogen production rate of 43.6 µmol h−1 g−1. By contrast, the catalysts synthesized using the impregnation and precipitation methods were less active, with 28.2 and 10.1 µmol h−1 g−1, respectively. The hydrogen production performance of the suspended catalyst (440 µmol m−2 g−1) showed to be superior to that of the corresponding immobilized catalyst (236 µmol m−2 g−1). Full article
(This article belongs to the Special Issue Environmental Remediation by Photocatalytic Functional Nanomaterials)
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14 pages, 6286 KiB  
Article
Optical and Photocatalytic Properties of Br-Doped BiOCl Nanosheets with Rich Oxygen Vacancies and Dominating {001} Facets
by Qian Zhang, Wuyang Nie, Tian Hou, Hao Shen, Qiang Li, Chongshang Guan, Libing Duan and Xiaoru Zhao
Nanomaterials 2022, 12(14), 2423; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12142423 - 15 Jul 2022
Cited by 6 | Viewed by 1397
Abstract
Crystal facet engineering and nonmetal doping are regarded as effective strategies for improving the separation of charge carriers and photocatalytic activity of semiconductor photocatalysts. In this paper, we developed a facial method for fabricating oxygen-deficient Br-doped BiOCl nanosheets with dominating {001} facets through [...] Read more.
Crystal facet engineering and nonmetal doping are regarded as effective strategies for improving the separation of charge carriers and photocatalytic activity of semiconductor photocatalysts. In this paper, we developed a facial method for fabricating oxygen-deficient Br-doped BiOCl nanosheets with dominating {001} facets through a traditional hydrothermal reaction and explored the impact of the Br doping and specific facets on carrier separation and photocatalytic performance. The morphologies, structures, and optical and photocatalytic properties of the obtained products were characterized systematically. The BiOCl samples prepared by the hydrothermal reaction exhibited square-like shapes with dominating {001} facets. Photodeposition results indicated that photoinduced electrons preferred to transfer to {001} facets because of the strong internal static electric fields in BiOCl nanosheets with dominating {001} facets. Br doping not only contributed to the formation of impurity energy levels that could promote light absorption but introduced a large number of surface oxygen vacancies (VO) in BiOCl photocatalysts, which was beneficial for photocatalytic performance. Moreover, the photocatalytic activities of these products under visible light were tested by degradation of rhodamine B (RhB). Because of the synergistic effect of the dominating {001} facets, Br doping, and rich VO, oxygen-deficient Br-doped BiOCl nanosheets exhibited improved carrier separation, visible light absorption, and photocatalytic efficiency. Full article
(This article belongs to the Special Issue Environmental Remediation by Photocatalytic Functional Nanomaterials)
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14 pages, 34942 KiB  
Article
Highly Mesoporous g-C3N4 with Uniform Pore Size Distribution via the Template-Free Method to Enhanced Solar-Driven Tetracycline Degradation
by Bao Lee Phoon, Chin Wei Lai, Guan-Ting Pan, Thomas C.-K. Yang and Joon Ching Juan
Nanomaterials 2021, 11(8), 2041; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11082041 - 11 Aug 2021
Cited by 23 | Viewed by 3163
Abstract
A highly mesoporous graphitic carbon nitride g-C3N4 (GCN) has been produced by a template-free method and effectively photodegrade tetracycline (TC) antibiotic under solar light irradiation. The mesoporous GCN (GCN-500) greatly improves the photoactivity (0.0247 min−1) by 2.13 times, [...] Read more.
A highly mesoporous graphitic carbon nitride g-C3N4 (GCN) has been produced by a template-free method and effectively photodegrade tetracycline (TC) antibiotic under solar light irradiation. The mesoporous GCN (GCN-500) greatly improves the photoactivity (0.0247 min−1) by 2.13 times, as compared to that of bulk GCN (0.0116 min−1). The efficiently strengthened photoactivity is ascribed to the high porosity (117.05 m2/g), and improves the optical absorption under visible light (Eg = 2.65 eV) and good charge carrier separation efficiency. The synthesized mesoporous GCN shows a uniform pore size (~3 nm) distribution. GCN-500 shows large pore volume (0.210 cm3/g) compared to GCN-B (0.083 cm3/g). Besides, the GCN-500 also exhibits good recyclability and photostability for TC photodegradation. In conclusion, GCN-500 is a recyclable photocatalyst for the removal of TC under visible light irradiation. Full article
(This article belongs to the Special Issue Environmental Remediation by Photocatalytic Functional Nanomaterials)
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Review

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28 pages, 6842 KiB  
Review
On the Versatile Role of Electrospun Polymer Nanofibers as Photocatalytic Hybrid Materials Applied to Contaminated Water Remediation: A Brief Review
by Alexander Cordoba, Cesar Saldias, Marcela Urzúa, Marco Montalti, Moreno Guernelli, Maria Letizia Focarete and Angel Leiva
Nanomaterials 2022, 12(5), 756; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12050756 - 24 Feb 2022
Cited by 13 | Viewed by 2360
Abstract
A wide variety of materials, strategies, and methods have been proposed to face the challenge of wastewater pollution. The most innovative and promising approaches include the hybrid materials made of polymeric nanofibers and photocatalytic nanoparticles. Electrospun nanofibers with unique properties, such as nanosized [...] Read more.
A wide variety of materials, strategies, and methods have been proposed to face the challenge of wastewater pollution. The most innovative and promising approaches include the hybrid materials made of polymeric nanofibers and photocatalytic nanoparticles. Electrospun nanofibers with unique properties, such as nanosized diameter, large specific surface area, and high aspect ratio, represent promising materials to support and stabilize photocatalytic nanosized semiconductors. Additionally, the role performed by polymer nanofibers can be extended even further since they can act as an active medium for the in situ synthesis of photocatalytic metal nanoparticles or contribute to pollutant adsorption, facilitating their approach to the photocatalytic sites and their subsequent photodegradation. In this paper, we review the state of the art of electrospun polymer/semiconductor hybrid nanofibers possessing photocatalytic activity and used for the remediation of polluted water by light-driven processes (i.e., based on photocatalytic activity). The crucial role of polymer nanofibers and their versatility in these types of procedures are emphasized. Full article
(This article belongs to the Special Issue Environmental Remediation by Photocatalytic Functional Nanomaterials)
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