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Nanomaterials
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Nanomaterials for Photodegradation of Pollutants
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Nanomaterials for Photodegradation of Pollutants

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 4776

Special Issue Editor

Dr. Miguel Angel Gracia-Pinilla

E-Mail Website
Guest Editor
Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, Av. Universidad s/n, Cd. Universitaria, San Nicolás de los Garza, Nuevo León 66455, Mexico
Interests: photocatalysts; engineering of nanomaterials; nanocomposites; HRTEM

Special Issue Information

Dear Colleagues,

In recent decades, the indiscriminate use of chemical substances and the inadequate waste management of these substances have generated an unprecedented accumulation of pollutants; at present, different types of pollutants (solids, liquids, and gases) accumulate in the air, soil, and water.

Nanoscale materials present new properties and an endless number of potential applications that allow the removal of pollutants through various processes such as absorption, degradation, and oxidation.

This Special Issue will focus on photodegradation processes of pollutants using natural or artificial light sources, which allow a certain versatility and potential applications in such processes.

We wish to focus this Special Issue on the engineering of nanomaterials applied to the photodegradation of pollutants (traditional and emerging); therefore, it will focus on the correlation and optimization of sizes, geometries, chemical compositions, dispersions of nanomaterials, and their responses to the photodegradation of pollutants.

The goal of this Special Issue is to provide a new perspective by collecting potential articles that connect a new research proposal to the photodegradation of pollutants by the use of nanomaterials. Manuscripts may explore the most promising advances in nanotechnology and nanoscience, with a focus on the use of solar UV light in the photodegradation of traditional and new pollutants. Moreover, this Special Issue accepts manuscripts exploring new routes of synthesis and nanomaterials that involve high-efficiency photodegradation and the use of removable energy sources in synthesis and photodegradation processes.

We look forward to receiving your contributions.

Dr. Miguel Angel Gracia-Pinilla
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

  • nanophotocatalysts
  • engineering of nanomaterials
  • photodegradation
  • nanocomposites
  • pollutants
  • photocatalytic

Published Papers (3 papers)

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Research

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20 pages, 6520 KiB  
Article
Eco-Friendly Reduction of Graphene Oxide by Aqueous Extracts for Photocatalysis Applications
by Luz H. Verástegui-Domínguez, Nora Elizondo-Villarreal, Dora Irma Martínez-Delgado and Miguel Ángel Gracia-Pinilla
Nanomaterials 2022, 12(21), 3882; https://doi.org/10.3390/nano12213882 - 3 Nov 2022
Cited by 6 | Viewed by 1572
Abstract
In the present work, reduced graphene oxide was obtained by green synthesis, using extracts of Larrea tridentata (gobernadora) and Capsicum Chinense (habanero). Graphene oxide was synthesized by the modified Hummers’ method and subsequently reduced using natural extracts to obtain a stable and environmentally [...] Read more.
In the present work, reduced graphene oxide was obtained by green synthesis, using extracts of Larrea tridentata (gobernadora) and Capsicum Chinense (habanero). Graphene oxide was synthesized by the modified Hummers’ method and subsequently reduced using natural extracts to obtain a stable and environmentally friendly graphene precursor. Consequently, the gobernadora aqueous extract was found to have a better reducing power than the habanero aqueous extract. This opportunity for green synthesis allows the application of RGO in photocatalysis for the degradation of the methylene blue dye. Degradation efficiencies of 60% and 90% were obtained with these materials. Full article
(This article belongs to the Special Issue Nanomaterials for Photodegradation of Pollutants)
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15 pages, 3324 KiB  
Article
Effective Removal of Methylene Blue by Surface Alteration of TiO2 with Ficus Carica Leaf Extract under Visible Light
by Muhammad Ali Bhatti, Sadaf Jamal Gilani, Aqeel Ahmed Shah, Iftikhar Ahmed Channa, Khalida Faryal Almani, Ali Dad Chandio, Imran Ali Halepoto, Aneela Tahira, May Nasser Bin Jumah and Zafar Hussain Ibupoto
Nanomaterials 2022, 12(16), 2766; https://doi.org/10.3390/nano12162766 - 12 Aug 2022
Cited by 13 | Viewed by 1965
Abstract
The present study describes the use of a leaf extract from Ficus carica as a source of natural antioxidants for the surface alteration of bulk titanium dioxide (TiO2) in two steps. First, the hydro-thermal treatment of the bulk TiO2 material [...] Read more.
The present study describes the use of a leaf extract from Ficus carica as a source of natural antioxidants for the surface alteration of bulk titanium dioxide (TiO2) in two steps. First, the hydro-thermal treatment of the bulk TiO2 material was carried out and followed by thermal annealing at 300 °C for 3 h in air. The role of the leaf extract of Ficus carica on the performance of the bulk TiO2 material for the removal of methylene blue (MB) was also studied. Various analytical techniques such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to explore the crystalline structure, morphology, and composition. The bulk TiO2 material after the leaf-extract treatment exhibited mixed anatase and rutile phases, a flower-like morphology, and Ti, O, and C were its main elements. The average crystallite size was also calculated, and the obtained values for the bulk TiO2 material, 18.11 nm, and the treated bulk TiO2 material with various amounts, 5, 10, and 15 mL, of leaf extract were 16.4, 13.16, and 10.29 nm respectively. Moreover, Fourier-transform infrared spectroscopy validated the typical metal–oxygen bonds and strengthened the XRD results. The bulk TiO2 material chemically treated with Ficus carica has shown outstanding activity towards the degradation of MB under sunlight. The 15 mL of Ficus carica extract significantly enhanced the photocatalytic activity of the bulk TiO2 material towards the degradation of MB. The dye degradation efficiency was found to be 98.8%, which was experimentally proven by the Fourier Transform Infrared spectroscopoyy (FTIR) analysis. The obtained performance of the bulk TiO2 material with Ficus carica revealed excellent surface modifying properties for poorly-performing photocatalysts towards the degradation of synthetic dyes when used in their pristine form. The presented approach suggests that Ficus carica could be of great interest for tuning the surface properties of materials, either in the form of nano-size or bulk-phase in a particular application. Full article
(This article belongs to the Special Issue Nanomaterials for Photodegradation of Pollutants)
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Review

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38 pages, 8356 KiB  
Review
BiVO4 As a Sustainable and Emerging Photocatalyst: Synthesis Methodologies, Engineering Properties, and Its Volatile Organic Compounds Degradation Efficiency
by Ganesh S. Kamble, Thillai Sivakumar Natarajan, Santosh S. Patil, Molly Thomas, Rajvardhan K. Chougale, Prashant D. Sanadi, Umesh S. Siddharth and Yong-Chein Ling
Nanomaterials 2023, 13(9), 1528; https://doi.org/10.3390/nano13091528 - 1 May 2023
Cited by 13 | Viewed by 3880
Abstract
Bismuth vanadate (BiVO4) is one of the best bismuth-based semiconducting materials because of its narrow band gap energy, good visible light absorption, unique physical and chemical characteristics, and non-toxic nature. In addition, BiVO4 with different morphologies has been synthesized and [...] Read more.
Bismuth vanadate (BiVO4) is one of the best bismuth-based semiconducting materials because of its narrow band gap energy, good visible light absorption, unique physical and chemical characteristics, and non-toxic nature. In addition, BiVO4 with different morphologies has been synthesized and exhibited excellent visible light photocatalytic efficiency in the degradation of various organic pollutants, including volatile organic compounds (VOCs). Nevertheless, the commercial scale utilization of BiVO4 is significantly limited because of the poor separation (faster recombination rate) and transport ability of photogenerated electron–hole pairs. So, engineering/modifications of BiVO4 materials are performed to enhance their structural, electronic, and morphological properties. Thus, this review article aims to provide a critical overview of advanced oxidation processes (AOPs), various semiconducting nanomaterials, BiVO4 synthesis methodologies, engineering of BiVO4 properties through making binary and ternary nanocomposites, and coupling with metals/non-metals and metal nanoparticles and the development of Z-scheme type nanocomposites, etc., and their visible light photocatalytic efficiency in VOCs degradation. In addition, future challenges and the way forward for improving the commercial-scale application of BiVO4-based semiconducting nanomaterials are also discussed. Thus, we hope that this review is a valuable resource for designing BiVO4-based nanocomposites with superior visible-light-driven photocatalytic efficiency in VOCs degradation. Full article
(This article belongs to the Special Issue Nanomaterials for Photodegradation of Pollutants)
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