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Catalysts
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Hybrid Catalysis
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Hybrid Catalysis

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (31 August 2018) | Viewed by 25142

Special Issue Editor

Prof. Dr. Kang Hyun Park

E-Mail Website
Guest Editor
Department of Chemistry, Pusan National University, Busan 46241, Korea
Interests: synthesis of new nanocatalysts & applications for organic reactions; fabrications & applications of nanomaterials; organometallic chemistry of f-and d-block transition metal complexes; new organometallic catalysts for efficient organic synthesis; transition-metal promoted organic synthesis and homogeneous catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Hybrid catalysis is offer cost effective and is highly competitive catalysis. Among the various hybrid catalyst materials, metal NPs, in particular, are gaining increasing attention. Integrating multiple functionalities into a single nanoparticle (NP) is an important strategy to design hybrid materials for advanced applications.

Recently, there has been a growing interest in the synthesis of heterodimeric metal−metal oxide NPs comprising nonprecious metal oxides owing to their unique magnetic, optical, and catalytic properties. The material properties of these NPs change at the heterojunction between a metal and metal oxide, resulting in surface reconstruction around the junction and electron transfer across the interface. Therefore, it is crucial to understand the interfacial interactions at the nanoscale level for designing advanced composite nanomaterials. The fabrication of hierarchical micro-/nanoarchitectures with controlled morphology, orientation and dimensionality, is a significant challenge for nanoscience.

Currently, three-dimensional (3D) hierarchical architectures, which are ordered assemblies using nanoparticles, nanorods and nanoplates as building blocks, have received much attention because of their potential applications in adsorption, catalysis, sensors, etc. Although such architectures, including inorganic and organic nanostructures, have already been extensively studied, it is crucial to develop simple and reliable synthetic methods utilizing designed chemical components. All experimental and theoretical works falling into the scope of this Special Issue, including original research papers, short communications, review articles, and perspective articles, are invited for submission.

Prof. Kang Hyun Park
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. 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

  • Hybrid
  • Catalyst
  • Nanocomposites
  • Multicomponent
  • Tandem Reaction
  • Metal

Published Papers (5 papers)

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Research

12 pages, 7569 KiB  
Article
SnO2 Composite Films for Enhanced Photocatalytic Activities
by Ke Han, Xue-Lei Peng, Fang Li and Ming-Ming Yao
Catalysts 2018, 8(10), 453; https://doi.org/10.3390/catal8100453 - 14 Oct 2018
Cited by 21 | Viewed by 4197
Abstract
As a new type of promising semiconductor photocatalyst, SnO2 cannot be widely applied due to its low utilization efficiency to visible light and swift recombination of photogenerated electrons and holes. These drawbacks were effectively overcome by preparing the B/Ag/F tridoped SnO2 [...] Read more.
As a new type of promising semiconductor photocatalyst, SnO2 cannot be widely applied due to its low utilization efficiency to visible light and swift recombination of photogenerated electrons and holes. These drawbacks were effectively overcome by preparing the B/Ag/F tridoped SnO2-ZnO composite films using the simple sol–gel method. The degradation of the methyl green and formaldehyde solutions was used to value the photocatalytic activity of the samples. Photoluminescence (PL) spectra and the UV–Vis absorption spectroscopy results of the samples illustrated that the B/Ag/F tridoped SnO2-ZnO composite film not only improved the lifetime of the charge carriers, but also enhanced their visible light absorption. The X-ray diffraction (XRD) results showed that the crystalline SnO2 was in the structure of rutile. As exhibited in the BET surface area results, the specific surface area of pure SnO2 was 19.9 m2g−1, while that of the B/Ag/F tridoped SnO2-ZnO was 85.3 m2g−1. Compared to pure SnO2, SnO2-ZnO, or the mono- or di-doped SnO2-ZnO films, the B/Ag/F tridoped SnO2-ZnO composite film had the highest photocatalytic activity. Full article
(This article belongs to the Special Issue Hybrid Catalysis)
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17 pages, 7892 KiB  
Article
A Facile Synthesis of Visible-Light Driven Rod-on-Rod like α-FeOOH/α-AgVO3 Nanocomposite as Greatly Enhanced Photocatalyst for Degradation of Rhodamine B
by Meng Sun, Raja Arumugam Senthil, Junqing Pan, Sedahmed Osman and Abrar Khan
Catalysts 2018, 8(9), 392; https://doi.org/10.3390/catal8090392 - 12 Sep 2018
Cited by 45 | Viewed by 4937
Abstract
In this work, we have synthesized the rod-on-rod–like α-FeOOH/α-AgVO3 nanocomposite photocatalysts with the different amounts of solvothermally synthesized α-FeOOH nanorods via a simple co-precipitation method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, UV−Visible diffuse reflectance spectroscopy, [...] Read more.
In this work, we have synthesized the rod-on-rod–like α-FeOOH/α-AgVO3 nanocomposite photocatalysts with the different amounts of solvothermally synthesized α-FeOOH nanorods via a simple co-precipitation method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, UV−Visible diffuse reflectance spectroscopy, scanning electron microscopy (SEM), element mapping, high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS) analysis. The observed SEM images show that both α-AgVO3 and α-FeOOH exhibits the rod-shaped morphology with nano size. Furthermore, the photocatalytic activities of the obtained photocatalysts were evaluated towards the degradation of Rhodamine B (RhB) under visible-light irradiation. It is demonstrated that the 3 mg α-FeOOH added to the α-FeOOH/α-AgVO3 nanocomposite exhibited an enhanced photocatalytic performance as compared with the pure α-AgVO3 and α-FeOOH. This significant improvement can be attributed to the increased photo-excited electron-hole pair separation efficiency, large portion of visible-light absorption ability and the reduced recombination of the electron-hole pair. The recycling test revealed that the optimized nanocomposite exhibited good photostability and reusability properties. In addition, the believable photodegradation mechanism of RhB using α-FeOOH/α-AgVO3 nanocomposite is proposed. Hence, the developed α-FeOOH/α-AgVO3 nanocomposite is a promising material for the degradation of organic pollutants in an aqueous environment. Full article
(This article belongs to the Special Issue Hybrid Catalysis)
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20 pages, 4993 KiB  
Article
Step-by-Step Growth of HKUST-1 on Functionalized TiO2 Surface: An Efficient Material for CO2 Capture and Solar Photoreduction
by Barbara Di Credico, Matteo Redaelli, Marianna Bellardita, Massimo Calamante, Cinzia Cepek, Elkid Cobani, Massimiliano D’Arienzo, Claudio Evangelisti, Marcello Marelli, Massimo Moret, Leonardo Palmisano and Roberto Scotti
Catalysts 2018, 8(9), 353; https://doi.org/10.3390/catal8090353 - 27 Aug 2018
Cited by 52 | Viewed by 6609
Abstract
The present study reports on a simple preparation strategy of a hybrid catalyst, TiO2/HKUST-1, containing TiO2 anatase nanoparticles (NPs) with tailored morphology and photocatalytic activity coupled with a porous metal-organic framework (MOF), namely HKUST-1, as an advanced material for the [...] Read more.
The present study reports on a simple preparation strategy of a hybrid catalyst, TiO2/HKUST-1, containing TiO2 anatase nanoparticles (NPs) with tailored morphology and photocatalytic activity coupled with a porous metal-organic framework (MOF), namely HKUST-1, as an advanced material for the CO2 photocatalytic reduction. In detail, TiO2/HKUST-1 catalyst was prepared via an easy slow-diffusion method combined with a step-by-step self-assembly at room temperature. The growth of crystalline HKUST-1 onto titania surface was achieved by functionalizing TiO2 nanocrystals, with phosphoesanoic acid (PHA), namely TiO2-PHA, which provides an intimate contact between MOF and TiO2. The presence of a crystalline and porous shell of HKUST-1 on the TiO2 surfaces was assessed by a combination of analytical and spectroscopic techniques. TiO2/HKUST-1 nanocomposite showed a significant efficiency in reducing CO2 to CH4 under solar light irradiation, much higher than those of the single components. The role of MOF to improve the photoreduction process under visible light was evidenced and attributed either to the relevant amount of CO2 captured into the HKUST-1 porous architecture or to the hybrid structure of the material, which affords enhanced visible light absorption and allows an effective electron injection from TiO2-PHA to HKUST-1, responsible for the photochemical reduction of CO2. Full article
(This article belongs to the Special Issue Hybrid Catalysis)
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19 pages, 15615 KiB  
Article
Removal of Methylene Blue from Water by BiFeO3/Carbon Fibre Nanocomposite and Its Photocatalytic Regeneration
by Shuang Jiao, Yiming Zhao, Meng Bi, Shuyue Bi, Xiangman Li, Binsong Wang, Chensha Li and Yinmao Dong
Catalysts 2018, 8(7), 267; https://doi.org/10.3390/catal8070267 - 29 Jun 2018
Cited by 11 | Viewed by 4931
Abstract
It is essential to prepare a highly efficient and reproducible adsorbent for purifying industrial dye wastewater. In this work, a novel and efficient BiFeO3/carbon fiber (CCT-BFO) nanocomposite adsorbent was prepared by the template method and through optimizing the preparation process. The [...] Read more.
It is essential to prepare a highly efficient and reproducible adsorbent for purifying industrial dye wastewater. In this work, a novel and efficient BiFeO3/carbon fiber (CCT-BFO) nanocomposite adsorbent was prepared by the template method and through optimizing the preparation process. The morphology, physicochemical properties, and specific surface characteristics of the CCT-BFO were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, Fourier-transform infrared spectrometer (FTIR), and N2 adsorption-desorption isotherm. The CCT-BFO could efficiently remove the Methylene blue (MB) from aqueous solutions, and the adsorption performance is not easily influenced by the environment. The equilibrium adsorption data were fitted to the classical models very well; the maximum capacity of adsorption MB onto the CCT-BFO was higher than many other reported adsorbents and the data of the adsorption kinetics were described by a pseudo-second-order model. Furthermore, the CCT-BFO can be recycled by photocatalytic regeneration. And the constant adsorption capacity was almost retained after recycling five times. Full article
(This article belongs to the Special Issue Hybrid Catalysis)
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12 pages, 2750 KiB  
Article
Intrinsic Catalytic Activity of Gold/Multi-Walled Carbon Nanotubes Composites in Squaric Acid-Iron(II/III) System
by Yanxia Li, Cheng Jiang, Shengheng Lin, Jiajia Lai, Liyun Zheng and Pengjun Xu
Catalysts 2018, 8(5), 187; https://doi.org/10.3390/catal8050187 - 02 May 2018
Cited by 1 | Viewed by 2944
Abstract
In this paper, gold/multi-walled carbon nanotube (Au/MWCNTs) composites were prepared via in situ reductions. The synthesized materials could effectively catalyze the system of square acid (SQA)-iron(II/III) to produce a significant color reaction. By designing the orthogonal test of three-factor and three-level, the three [...] Read more.
In this paper, gold/multi-walled carbon nanotube (Au/MWCNTs) composites were prepared via in situ reductions. The synthesized materials could effectively catalyze the system of square acid (SQA)-iron(II/III) to produce a significant color reaction. By designing the orthogonal test of three-factor and three-level, the three factors of sodium formate solution concentration, ultrasonic time and synthesis reaction time were optimized in the process of Au/MWCNTs preparation. Results showed that the Au/MWCNTs had the best catalytic activity under the conditions of sodium formate solution concentration of 400 mmol/L, ultrasonic for 30 min and reaction for 4 h. In a subsequent comparison with H2O2, it found that the catalytic performance of 1 mg of Au/MWCNTs composite was equivalent to that of H2O2 with the concentration of 0.28 mmol/L. It demonstrated that the prepared Au/MWCNTs composites had good catalytic activity, stable color and low background noise, indicating a good prospect in various fields including that of catalytic reaction, sensing analysis, and nanomaterials labeling. Full article
(This article belongs to the Special Issue Hybrid Catalysis)
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