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Nanomaterials
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Low-Dimensional Carbon-Based Nanomaterials for Photoelectrochemical Environmental and Energy Applications
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Low-Dimensional Carbon-Based Nanomaterials for Photoelectrochemical Environmental and Energy Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6594

Special Issue Editor

Prof. Dr. Ruey-An Doong

E-Mail Website
Guest Editor
Center for Energy and Environmental Research and Institute of Analytical and Environmental Sciences, National Tsing Hua University, 101, Section 2, Kuang Fu Road, Hsinchu 300, Taiwan
Interests: heterogeneous photoelectrocatalysis; environmental nanomaterials; water-energy nexus; low-dimensional carbon nanomaterials; porous nanomaterials; nanosensing devices; energy storage nanomaterials.
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Over the past several decades, the development of advanced nanomaterials for environmental, biomedical, and energy applications has become increasingly important. Carbon nanomaterials are some of the most often developed nanomaterials because of their good electric conductivity, high stability, and ease of functionalization, and they have been widely used as electrode materials, catalyst supports, and adsorbents.

Low-dimensional carbon nanomaterials such as 0-D carbon dots (CD), 1-D carbon nanotubes (CNTs) and electrospun fibers, 2-D graphenes, graphitic carbon nitride (g-C3N4), and MXene have recently been regarded as an emerging class of nanomaterials. Since carbon-based nanomaterials with low dimension have unique properties including high specific surface area, excellent electron transfer rate, and superior photoelectrochemical properties, these low-dimensional carbon nanomaterials can be used for novel photoelectrochemical applications like water splitting, energy storage (supercapacitors and batteries), advanced oxidation processes (AOPs), and nanosensing.

This Special Issue of Nanomaterials will focus on the most recent advances in the synthesis, advanced characterization, and application of low-dimensional carbon-based nanomaterials including nanocomposites and hybrids for energy storage and biomedicine.

Prof. Dr. Ruey-An Doong
Guest Editor

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Keywords

  • low-dimensional carbon nanomaterials
  • 0-D carbon dots/graphene quantum dots
  • 1-D electro spun nanofibers
  • 2-D graphene/graphitic carbon nitride/MXene
  • water splitting
  • water and wastewater purification
  • supercapacitors and batteries
  • nanosensing and nanozymes

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Published Papers (3 papers)

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Research

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17 pages, 6500 KiB  
Article
Enhanced Visible-Light-Responsive Photocatalytic Degradation of Ciprofloxacin by the CuxO/Metal-Organic Framework Hybrid Nanocomposite
by Cheng-Kuo Tsai, Ching-Hsuan Huang, Jao-Jia Horng, Hui Lin Ong and Ruey-An Doong
Nanomaterials 2023, 13(2), 282; https://doi.org/10.3390/nano13020282 - 9 Jan 2023
Cited by 10 | Viewed by 2766
Abstract
Ciprofloxacin (CIP) is a commonly used antibiotic, however, once in the environment, it is highly toxic with a poor biodegradability. Given these attributes, an effective strategy for the removal of CIP is urgently needed for the protection of water resources. Herein, a novel [...] Read more.
Ciprofloxacin (CIP) is a commonly used antibiotic, however, once in the environment, it is highly toxic with a poor biodegradability. Given these attributes, an effective strategy for the removal of CIP is urgently needed for the protection of water resources. Herein, a novel copper metal-organic framework (CuxO/MOF) multifunctional material has been produced, in this work, by the calcination of Cu-MOF urea at 300 °C, in the presence of a 5% H2 atmosphere. The morphological, structural, and thermal properties of the prepared CuxO/MOF were determined through various techniques, and its photocatalytic behavior was investigated for the degradation of CIP under visible-light irradiation. The prepared CuxO/MOF bifunctional material is presented as a graphitic carbon-layered structure with a particle size of 9.2 ± 2.1 nm. The existence of CuO-Cu2O-C, which was found on the CuxO/MOF surface, enhanced the adsorption efficiency and increased the photosensitivity of CuxO/MOF, towards the degradation of CIP in aqueous solutions. The tailored CuxO/MOF, not only shows an excellent CIP degradation efficiency of up to 92% with a constant kinetic rate (kobs) of 0.048 min−1 under visible light, but it can also retain the stable photodegradation efficiency of >85%, for at least six cycles. In addition, CuxO/MOF has an excellent adsorption capacity at pH 6.0 of the maximum Langmuir adsorption capacity of 34.5 mg g−1 for CIP. The results obtained in this study demonstrate that CuxO/MOF is a reliable integrated material and serves as an adsorbent and photocatalyst, which can open a new pathway for the preparation of visible-light-responsive photocatalysts, for the removal of antibiotics and other emerging pollutants. Full article
(This article belongs to the Special Issue Low-Dimensional Carbon-Based Nanomaterials for Photoelectrochemical Environmental and Energy Applications)
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15 pages, 4233 KiB  
Article
Erbium-Doped GQD-Embedded Coffee-Ground-Derived Porous Biochar for Highly Efficient Asymmetric Supercapacitor
by Thi Ai Ngoc Bui, Trung Viet Huynh, Hai Linh Tran and Ruey-an Doong
Nanomaterials 2022, 12(11), 1939; https://doi.org/10.3390/nano12111939 - 6 Jun 2022
Cited by 8 | Viewed by 2580
Abstract
A nanocomposite with erbium-doped graphene quantum dots embedded in highly porous coffee-ground-derived biochar (Er-GQD/HPB) was synthesized as a promising electrode material for a highly efficient supercapacitor. The HPB showed high porosity, with a large surface area of 1295 m2 g−1 and [...] Read more.
A nanocomposite with erbium-doped graphene quantum dots embedded in highly porous coffee-ground-derived biochar (Er-GQD/HPB) was synthesized as a promising electrode material for a highly efficient supercapacitor. The HPB showed high porosity, with a large surface area of 1295 m2 g−1 and an average pore size of 2.8 nm. The 2–8-nanometer Er-GQD nanoparticles were uniformly decorated on the HPB, subsequently increasing its specific surface area and thermal stability. Furthermore, the intimate contact between the Er-GQDs and HPB significantly reduced the charge-transfer resistance and diffusion path, leading to the rapid migration of ions/electrons in the mesoporous channels of the HPB. By adding Er-GQDs, the specific capacitance was dramatically increased from 337 F g−1 for the pure HPB to 699 F g−1 for the Er-GQD/HPB at 1 A g−1. The Ragone plot of the Er-GQD/HPB exhibited an ultrahigh energy density of 94.5 Wh kg−1 and a power density of 1.3 kW kg−1 at 1 A g−1. Furthermore, the Er-GQD/HPB electrode displayed excellent cycling stability, and 81% of the initial capacitance remained after 5000 cycles. Our results provide further insights into a promising supercapacitance material that offers the benefits of both fast ion transport from highly porous carbons and electrocatalytic improvement due to the embedment of Er-doped GQDs to enhance energy density relative to conventional materials. Full article
(This article belongs to the Special Issue Low-Dimensional Carbon-Based Nanomaterials for Photoelectrochemical Environmental and Energy Applications)
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Review

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34 pages, 4510 KiB  
Review
Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review
by Is Fatimah, Ganjar Fadillah, Ika Yanti and Ruey-an Doong
Nanomaterials 2022, 12(5), 825; https://doi.org/10.3390/nano12050825 - 1 Mar 2022
Cited by 36 | Viewed by 5127
Abstract
Advanced oxidation processes (AOPs) utilizing heterogeneous catalysts have attracted great attention in the last decade. The use of solid catalysts, including metal and metal oxide nanoparticle support materials, exhibited better performance compared with the use of homogeneous catalysts, which is mainly related to [...] Read more.
Advanced oxidation processes (AOPs) utilizing heterogeneous catalysts have attracted great attention in the last decade. The use of solid catalysts, including metal and metal oxide nanoparticle support materials, exhibited better performance compared with the use of homogeneous catalysts, which is mainly related to their stability in hostile environments and recyclability and reusability. Various solid supports have been reported to enhance the performance of metal and metal oxide catalysts for AOPs; undoubtedly, the utilization of clay as a support is the priority under consideration and has received intensive interest. This review provides up-to-date progress on the synthesis, features, and future perspectives of clay-supported metal and metal oxide for AOPs. The methods and characteristics of metal and metal oxide incorporated into the clay structure are strongly influenced by various factors in the synthesis, including the kind of clay mineral. In addition, the benefits of nanomaterials from a green chemistry perspective are key aspects for their further considerations in various applications. Special emphasis is given to the basic schemes for clay modifications and role of clay supports for the enhanced mechanism of AOPs. The scaling-up issue is suggested for being studied to further applications at industrial scale. Full article
(This article belongs to the Special Issue Low-Dimensional Carbon-Based Nanomaterials for Photoelectrochemical Environmental and Energy Applications)
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