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Catalysts
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Advances in Quantum Dots Catalysts
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Advances in Quantum Dots Catalysts

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

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 2715

Special Issue Editors

Prof. Dr. Bathula Babu

E-Mail Website
Guest Editor
School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Korea
Interests: quantum dots; photocatalysis; plasmonic; core@shell; water splitting; supercapacitors
Special Issues, Collections and Topics in MDPI journals
Dr. G. Thirumala Rao

E-Mail Website
Guest Editor
Department of Basic Sciences & Humanities, GMR Institute of Technology, Rajam 532 127, Andhra Pradesh, India
Interests: quantum dots; photocatalysis; plasmonic; core@shell; water splitting

Special Issue Information

Dear Colleagues,

Quantum dots (QDs) have emerged as promising materials for use in heterogeneous catalysis due to their unique electronic and optical properties. In recent years, there has been growing interest in the development of QD-based catalysts for various applications such as photocatalysis, water splitting, CO2 reduction, and NOx reduction. This Special Issue of Catalysts aims to highlight recent advances in the field of QD catalysts and their applications in these areas. In particular, it will focus on the synthesis and characterization of QD catalysts. This includes the development of new QD materials, such as core shell and alloyed QDs, and the investigation of their properties using advanced techniques such as X-ray diffraction, transmission electron microscopy, and spectroscopy. In addition, it will discuss the application of QD catalysts in photocatalytic reactions for water splitting and CO2 reduction. These reactions have gained significant attention due to their potential to produce clean and renewable energy sources. Contributions to this section may cover topics such as the design and optimization of QD-based photocatalysts, the development of new strategies to improve their catalytic performance, and the exploration of novel QD architectures for these applications. Furthermore, this section will cover the use of QD catalysts for the reduction of NOx emissions in automotive and industrial processes. This section will include discussions on the challenges of developing QD-based catalysts for NOx reduction, the investigation of the reaction mechanism, and the optimization of the catalytic performance. Overall, this Special Issue aims to provide a comprehensive overview of recent advancements in the field of QD catalysts, and their applications in photocatalysis, water splitting, CO2 reduction, and NOx reduction. Contributions from researchers in the fields of electrochemistry, physics, chemistry, and materials science are welcome and encouraged.

Prof. Dr. Bathula Babu
Dr. G. Thirumala Rao
Guest Editors

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

  • quantum dots
  • catalysts
  • photocatalysis
  • water splitting
  • CO2 reduction
  • NOx reduction

Published Papers (2 papers)

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Research

16 pages, 7260 KiB  
Article
Direct Hydrothermally Synthesized Novel Z-Scheme Dy3+ Doped ZnO/SnS Nanocomposite for Rapid Photocatalytic Degradation of Organic Contaminants
by Tejaswi Tanaji Salunkhe, Govinda Dharmana, Thirumala Rao Gurugubelli, Babu Bathula and Kisoo Yoo
Catalysts 2023, 13(9), 1292; https://doi.org/10.3390/catal13091292 - 12 Sep 2023
Cited by 1 | Viewed by 1528
Abstract
Different concentrations (1, 3 and 5 wt%) of dysprosium (Dy3+)-doped ZnO/SnS (ZSD) nanophotocatalysts using the one-step facile hydrothermal method at 230 ℃ are presented. Their structure, morphological appearance, inclusion of constituent elements, bandgap engineering and luminescent nature are confirmed by the [...] Read more.
Different concentrations (1, 3 and 5 wt%) of dysprosium (Dy3+)-doped ZnO/SnS (ZSD) nanophotocatalysts using the one-step facile hydrothermal method at 230 ℃ are presented. Their structure, morphological appearance, inclusion of constituent elements, bandgap engineering and luminescent nature are confirmed by the XRD, TEM, XPS, UV-DRS and PL techniques. The photocatalytic activity (PCA) of the prepared nano photocatalysts is studied in the presence of a model pollutant MB under solar light illumination. The degradation kinetics and charge separation mechanism of the ZSD photocatalysts are also presented. Our XRD analysis showed the mixed-phase occurrence of ZnO (hexagonal) and SnS (orthorhombic) from their JCPDS numbers with no additional traces of a doping element, which in turn indicates the purity, substantial crystal structure and high dispersion of the samples. TEM micrographs revealed the appearance of a flake structure and more agglomeration when increasing the dopant concentration. The XPS spectra confirmed the Zn2+, Sn2+, S2−, O2− and Dy3+ oxidation states of the constituent elements along with carbon and nitrogen peaks. The Tauc plots showed a decreasing trend in the optical bandgap, i.e., a redshift due to the loading of Dy3+ ions into Sn2+ ions. The lower recombination rate of photoinduced e−-h+ pairs is noted when increasing the Dy3+ ion content; i.e., the luminescent intensity is suppressed when increasing the concentration of Dy3+ ions. The obtained degradation efficiency of the MB dye using the ZSD3 nano photocatalyst is around 98% for a duration of 120 min under solar light irradiation. The prepared ZSD photocatalyst follows pseudo first-order kinetics, and the evidence for attaining a robust Z-scheme PCA is presented in the form of the charge separation mechanism. Full article
(This article belongs to the Special Issue Advances in Quantum Dots Catalysts)
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13 pages, 6258 KiB  
Article
Z-Scheme Photocatalytic Degradation of Potassium Butyl Xanthate by a 2D/2D Heterojunction of Bi2WO6 Using MoS2 as a Co-Catalyst
by Mohan Rao Tamtam, Ravindranadh Koutavarapu, Gyu Sang Choi and Jaesool Shim
Catalysts 2023, 13(9), 1238; https://doi.org/10.3390/catal13091238 - 25 Aug 2023
Cited by 1 | Viewed by 861
Abstract
Xanthate pollution during mineral processing is currently a major global challenge. Solar energy-induced photocatalysis is an effective and sustainable solution to this problem. The synthesis of specially designed photocatalysts is a critical step in this field of research. Even though a large number [...] Read more.
Xanthate pollution during mineral processing is currently a major global challenge. Solar energy-induced photocatalysis is an effective and sustainable solution to this problem. The synthesis of specially designed photocatalysts is a critical step in this field of research. Even though a large number of structures have been developed in this regard, they are limited by low visible-light absorption and the fast recombination of photoinduced electron–hole pairs. To address these barriers, a novel nano-hybrid was developed with Bi2WO6 nanoflakes using MoS2 nanosheets as the co-catalyst. The as-prepared hybrid was critically examined to confirm its successful formation and determine its inherent exclusive characteristics. Finally, the photocatalytic ability for xanthate removal from wastewater was measured. The bandgap energy of Bi2WO6 and MoS2 was 2.85 eV and 1.87 eV, respectively, while that of the synthesized heterostructure was 2.54 eV. The photocatalytic ability of this novel structure is 6.65 and 9.65 times that of Bi2WO6 and MoS2, respectively. Full article
(This article belongs to the Special Issue Advances in Quantum Dots Catalysts)
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