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Nanomaterials
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Fabrication of Heterostructure Nanomaterials for Catalysis
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Fabrication of Heterostructure Nanomaterials for Catalysis

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

Deadline for manuscript submissions: closed (10 February 2022) | Viewed by 18474

Special Issue Editor

Dr. Jerry J. Wu

E-Mail Website
Guest Editor
Department of Environmental Engineering and Science, Feng Chia University, Taichung, Taiwan
Interests: functional nanomaterials; sensing materials; energy materials; photocatalysis; renewable energy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Heterostructure nanomaterials have been explored as potential catalysts in many heterogeneous catalysis applications, such as photo/electrochemical water splitting, carbon dioxide conversion, pollutant remediation, hydrodesulfurization of petroleum, organic molecule transformations, etc. Herein, we invite authors to contribute original research articles or comprehensive review articles covering the most recent progress and new developments in the synthesis and utilization of heterostructure nanomaterials for highly efficient and novel processes associated with catalytic applications in energy, the environment, and sustainability. This Special Issue aims to cover a broad range of subjects from heterostructure nanomaterials synthesis to the design and technologies with nanomaterial integration. The article type includes full papers, communications, and reviews. Potential topics include but are not limited to:

  • Heterostructure nanomaterials development, synthesis, and fabrication for catalytic reactions;
  • Design and preparation of novel nanotextured/nanostructured surfaces for improved energy storage and conversion efficiencies;
  • Low-dimensional nanomaterials or nanocomposites for catalysis applications;
  • Green techniques for heterostructure nanomaterials processing;
  • Nanomaterial-based technologies for environmental and sustainable catalysis issues;
  • Other studies of nanoscience and nanotechnology associated with catalysis and sustainability.

Prof. Jerry J. Wu
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

  • heterostructure nanomaterials
  • catalytic energy
  • environmental catalysis
  • sustainability
  • photocatalysis

Published Papers (6 papers)

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Research

20 pages, 4683 KiB  
Article
Z-Scheme Heterojunction of 3-Dimensional Hierarchical Bi3O4Cl/Bi5O7I for a Significant Enhancement in the Photocatalytic Degradation of Organic Pollutants (RhB and BPA)
by Syed Taj Ud Din, Hankyu Lee and Woochul Yang
Nanomaterials 2022, 12(5), 767; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12050767 - 24 Feb 2022
Cited by 9 | Viewed by 2298
Abstract
In this study, we report the synthesis of a 3-dimensional (3D) hierarchical Bi3O4Cl/Bi5O7I (BOC/BOI) heterostructure for the photocatalytic degradation of Rhodamine-B (RhB) dye and colorless Bisphenol-A (BPA) pollutant under visible light. The heterostructure was prepared [...] Read more.
In this study, we report the synthesis of a 3-dimensional (3D) hierarchical Bi3O4Cl/Bi5O7I (BOC/BOI) heterostructure for the photocatalytic degradation of Rhodamine-B (RhB) dye and colorless Bisphenol-A (BPA) pollutant under visible light. The heterostructure was prepared using in situ solvothermal and calcination methods. BOC/BOI exhibits a 3D hierarchical structure constructed with thin nano-platelets. The photocatalytic performance of the BOC/BOI photocatalyst demonstrated that the degradation efficiencies of RhB and BPA were 97% and 92% after light illumination within 90 and 30 min, respectively. In comparison, bare BOC and BOI efficiencies were only 20% and 10% for RhB dye, respectively, and 2.3% and 37% for BPA aqueous pollutants, respectively. Moreover, radical trapping measurements indicated that •O2− and •OH radicals played prominent roles in RhB and BPA degradation into mineralization. Analysis of band structures and photochemical redox reactions of BOC/BOI revealed a Z-scheme charge transfer between BOC and BOI by an internal electric field formed at the interface. Therefore, the highly improved photocatalytic performance of the BOC/BOI heterostructure is attributed to the synergetic effects of large surface area, high visible-light absorption, and the enhanced separation and transport of photo-excited electron–hole pairs induced by the hierarchical and Z-scheme heterojunction of the BOC/BOI. Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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15 pages, 43619 KiB  
Article
Photocatalytic Hydrogen Evolution from Water Splitting Using Core-Shell Structured Cu/ZnS/COF Composites
by Wenmin Wang, Bing Li, Hsin-Ju Yang, Yuzhi Liu, Lakshmanan Gurusamy, Lakshmanan Karuppasamy and Jerry J. Wu
Nanomaterials 2021, 11(12), 3380; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11123380 - 13 Dec 2021
Cited by 12 | Viewed by 3219
Abstract
Hydrogen is considered to be a very efficient and clean fuel since it is a renewable and non-polluting gas with a high energy density; thus, it has drawn much attention as an alternative fuel, in order to alleviate the issue of global warming [...] Read more.
Hydrogen is considered to be a very efficient and clean fuel since it is a renewable and non-polluting gas with a high energy density; thus, it has drawn much attention as an alternative fuel, in order to alleviate the issue of global warming caused by the excess use of fossil fuels. In this work, a novel Cu/ZnS/COF composite photocatalyst with a core–shell structure was synthesized for photocatalytic hydrogen production via water splitting. The Cu/ZnS/COF microspheres formed by Cu/ZnS crystal aggregation were covered by a microporous thin-film COF with a porous network structure, where COF was also modified by the dual-effective redox sites of C=O and N=N. The photocatalytic hydrogen production results showed that the hydrogen production rate reached 278.4 µmol g−1 h−1, which may be attributed to its special structure, which has a large number of active sites, a more negative conduction band than the reduction of H+ to H2, and the ability to inhibit the recombination of electron–hole pairs. Finally, a possible mechanism was proposed to effectively explain the improved photocatalytic performance of the photocatalytic system. The present work provides a new concept, in order to construct a highly efficient hydrogen production catalyst and broaden the applications of ZnS-based materials. Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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15 pages, 3091 KiB  
Article
Visible-Light Active Sulfur-Doped Titania Nanoparticles Immobilized on a Silica Matrix: Synthesis, Characterization and Photocatalytic Degradation of Pollutants
by Theodora Kalampaliki, Sofia P. Makri, Evanthia Papadaki, Alexios Grigoropoulos, Alexandros Zoikis Karathanasis and Ioanna Deligkiozi
Nanomaterials 2021, 11(10), 2543; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11102543 - 28 Sep 2021
Cited by 5 | Viewed by 2805
Abstract
The photocatalytic oxidation (PCO) of pollutants using TiO2-based materials can significantly improve indoor air quality (IAQ), which in turn, has a significant impact on human health and life expectancy. TiO2-based nanoparticles (NPs) are widely used as part of building [...] Read more.
The photocatalytic oxidation (PCO) of pollutants using TiO2-based materials can significantly improve indoor air quality (IAQ), which in turn, has a significant impact on human health and life expectancy. TiO2-based nanoparticles (NPs) are widely used as part of building materials to function as photocatalysts in PCO. In this work, a series of sulfur-doped TiO2 NPs immobilized on a silica matrix were synthesized by combining a sol-gel process with ball milling. The samples were structurally characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Fourier-transform infrared spectroscopy (FT-IR) and N2 adsorption-desorption isotherms. Furthermore, the morphological characteristics were determined by dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic activity of the as prepared S-doped TiO2/SiO2 NPs in the degradation of liquid and air pollutants under visible-light irradiation was investigated. Our results show that sulfur is an effective dopant for activating TiO2/SiO2 photocatalysts under visible-light irradiation. Silica constitutes a “safe-by-design” approach and inhibits the aggregation of NPs during synthesis. The most efficient photocatalyst afforded 79% removal of methyl orange (5 h), 26% removal of acetaldehyde (1 h) and 12% oxidation of NO (1 h). Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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11 pages, 703 KiB  
Article
Adsorption of Carbon Dioxide on Mono-Layer Thick Oxidized Samarium Films on Ni(100)
by Steinar Raaen
Nanomaterials 2021, 11(8), 2064; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11082064 - 14 Aug 2021
Cited by 3 | Viewed by 1793
Abstract
Studies of adsorption of CO2 on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide on pure and oxidized thin samarium layers near mono-layer thickness on [...] Read more.
Studies of adsorption of CO2 on nanoscopic surfaces are relevant for technological applications in heterogeneous catalysis as well as for sorption of this important greenhouse gas. Presently, adsorption of carbon dioxide on pure and oxidized thin samarium layers near mono-layer thickness on Ni(100) has been investigated by photoelectron spectroscopy and temperature programmed desorption. It is observed that very little CO2 adsorb on the metallic sample for exposures in the vacuum regime at room temperature. For the oxidized sample, a large enhancement in CO2 adsorption is observed in the desorption measurements. Indications of carbonate formation on the surface were found by C 1s and O 1s XPS. After annealing of the oxidized samples to 900 K very little CO2 was found to adsorb. Differences in desorption spectra before and after annealing of the oxidized samples are correlated with changes in XPS intensities, and with changes in sample work function which determines the energy difference between molecular orbitals and substrate Fermi level, and thus the probability of charge transfer between adsorbed molecule and substrate. Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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13 pages, 9416 KiB  
Article
Sonochemical Synthesis of Copper-doped BiVO4/g-C3N4 Nanocomposite Materials for Photocatalytic Degradation of Bisphenol A under Simulated Sunlight Irradiation
by Gang-Juan Lee, Xin-Yu Lee, Cong Lyu, Na Liu, Sambandam Andandan and Jerry J. Wu
Nanomaterials 2020, 10(3), 498; https://0-doi-org.brum.beds.ac.uk/10.3390/nano10030498 - 10 Mar 2020
Cited by 23 | Viewed by 4000
Abstract
Copper-doped bismuth vanadate/graphitic carbon nitride (BiVO4/g-C3N4) nanocomposite materials were successfully fabricated using a sonochemical approach. Cu-doped BiVO4/g-C3N4 nanocomposite photocatalysts could improve electron/hole (e−/h+) pair separation, stability, and light-harvesting [...] Read more.
Copper-doped bismuth vanadate/graphitic carbon nitride (BiVO4/g-C3N4) nanocomposite materials were successfully fabricated using a sonochemical approach. Cu-doped BiVO4/g-C3N4 nanocomposite photocatalysts could improve electron/hole (e−/h+) pair separation, stability, and light-harvesting efficiency compared to pristine BiVO4 or g-C3N4, resulting in the enhancement of photocatalytic activity. The optimal parameters, such as pH value at 10, photocatalyst dosage of 0.4 g L−1, and 10 mol% Cu-doped BiVO4/g-C3N4 photocatalyst, were determined to degrade initial concentration of 20 ppm Bisphenol A, which could be completely removed after 90 min. Furthermore, the excessive doping of copper (> 10 mol%) could not synthesize the pure monoclinic scheelite phase, which substantially resulted in the reduction of the photocatalytic activity. Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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12 pages, 3860 KiB  
Article
In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline
by Yuanyuan Li, Xiaofang Tian, Yaoqiong Wang, Qimei Yang, Yue Diao, Bin Zhang and Dingfeng Yang
Nanomaterials 2020, 10(1), 53; https://0-doi-org.brum.beds.ac.uk/10.3390/nano10010053 - 24 Dec 2019
Cited by 13 | Viewed by 3435
Abstract
Using solar energy to remove antibiotics from aqueous environments via photocatalysis is highly desirable. In this work, a novel type-II heterojunction photocatalyst, MgSn(OH)6/SnO2, was successfully prepared via a facile one-pot in situ hydrothermal method at 220 °C for 24 h. [...] Read more.
Using solar energy to remove antibiotics from aqueous environments via photocatalysis is highly desirable. In this work, a novel type-II heterojunction photocatalyst, MgSn(OH)6/SnO2, was successfully prepared via a facile one-pot in situ hydrothermal method at 220 °C for 24 h. The obtained heterojunctions were characterized via powder X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic performance was evaluated for photodegradation of tetracycline solution under ultraviolet irradiation. The initial concentration of tetracycline solution was set to be 20 mg/L. The prepared heterojunctions exhibited superior photocatalytic activity compared with the parent MgSn(OH)6 and SnO2 compounds. Among them, the obtained MgSn(OH)6/SnO2 heterojunction with MgCl2·6H2O:SnCl4·5H2O = 4:5.2 (mmol) displayed the highest photocatalytic performance and the photodegradation efficiency conversion of 91% could be reached after 60 min under ultraviolet irradiation. The prepared heterojunction maintained its performance after four successive cycles of use. Active species trapping experiments demonstrated that holes were the dominant active species. Hydroxyl radicals and superoxide ions had minor effects on the photocatalytic oxidation of tetracycline. Photoelectrochemical measurements were used to investigate the photocatalytic mechanism. The enhancement of photocatalytic activity could be assigned to the formation of a type-II junction photocatalytic system, which was beneficial for efficient transfer and separation of photogenerated electrons and holes. This research provides an in situ growth strategy for the design of highly efficient photocatalysts for environmental restoration. Full article
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
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