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Nanomaterials
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New Trends in Mesoporous Materials for Catalysis and Sensors
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New Trends in Mesoporous Materials for Catalysis and Sensors

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

Deadline for manuscript submissions: closed (30 July 2023) | Viewed by 9966

Special Issue Editors

Prof. Dr. Eun-Bum Cho

E-Mail Website
Guest Editor
Department of Fine Chemistry, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
Interests: mesoporous silica nanoparticles; hollow structure; fluorescent nanoparticles; mesoporous organosilica; mesoporous metal/metal oxide; adsorption; catalysis; drug release
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jeong Gil Seo

E-Mail Website
Guest Editor
Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea
Interests: heterogeneous catalysis; adsorptive separation; biomass conversion

Special Issue Information

Dear Colleagues,

Since the discovery of MCM-41-type ordered mesoporous silica by scientists from Mobil in 1992, considerable progress has been made in the synthesis of mesoporous materials with various structures and components. In particular, mesoporous silica and metal oxides have received a great amount of attention in heterogeneous catalysis and various types of sensors. Pioneers in this field have attempted enhance the performance of various catalytic systems, including those in the oil industry as well as in photocatalysis- and hydrogen-related systems. Although various synthesis methods have been reported, durability—for example, hydrothermal, chemical, and mechanical stability—remains a challenging barrier preventing the industrial application of mesoporous materials.

This Special Issue will present a self-contained set of papers on new synthesis methods and versatile applications of mesoporous materials, providing an exploration of current state-of-the-art research in this cutting-edge field, particularly in the areas of catalysis and sensors. These submissions can take the form of mini-reviews, original research papers, or short communications describing new breakthroughs.

All researchers in the field are invited to submit their manuscripts for publication in this Special Issue.

Prof. Dr. Eun-Bum Cho
Dr. Jeong Gil Seo
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. 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

  • mesoporous silica
  • mesoporous organosilica
  • mesoporous metal oxide
  • mesoporous aerogel
  • catalysis
  • sensor
  • photocatalysis
  • electrocatalysis
  • hydrogen
  • CO2 adsorption

Published Papers (6 papers)

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Research

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15 pages, 2251 KiB  
Article
A Gram Scale Soft-Template Synthesis of Heteroatom Doped Nanoporous Hollow Carbon Spheres for Oxygen Reduction Reaction
by Jisue Kang, Jong Gyeong Kim, Sunghoon Han, Youngin Cho and Chanho Pak
Nanomaterials 2023, 13(18), 2555; https://doi.org/10.3390/nano13182555 - 13 Sep 2023
Cited by 1 | Viewed by 927
Abstract
Heteroatom-doped nanoporous carbon materials with unique hierarchical structures have been shown to be promising supports and catalysts for energy conversion; however, hard-template methods are limited by their inflexibility and time-consuming process. Soft-template methods have been suggested as an alternative, but they are limited [...] Read more.
Heteroatom-doped nanoporous carbon materials with unique hierarchical structures have been shown to be promising supports and catalysts for energy conversion; however, hard-template methods are limited by their inflexibility and time-consuming process. Soft-template methods have been suggested as an alternative, but they are limited by their picky requirements for stable reactions and the few known precursors for small-batch synthesis. In this study, a gram-scale soft-template-based silica-assisted method was investigated for producing nitrogen-doped hollow nanoporous carbon spheres (N-HNCS). Nitrogen doping is accomplished during preparation with enhanced electrocatalytic activity without complicating the methodology. To investigate the effect of the unique structural characteristics of N-HNCS (specific surface area: 1250 m2 g−1; pore volume: 1.2 cm3 g−1), cobalt was introduced as an active center for the oxygen reduction reaction. Finely tuned reaction conditions resulted in well-dispersed cobalt particles with minimal agglomeration. This sheds light on the advancement of new experimental procedures for developing more active and promising non-noble catalysts in large and stable batches. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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13 pages, 3300 KiB  
Article
MOF-Derived Co Nanoparticles Catalyst Assisted by F- and N-Doped Carbon Quantum Dots for Oxygen Reduction
by Yuqi Ma, Ki-Wook Sung and Hyo-Jin Ahn
Nanomaterials 2023, 13(14), 2093; https://doi.org/10.3390/nano13142093 - 18 Jul 2023
Cited by 3 | Viewed by 1411
Abstract
The oxygen reduction reaction is crucial in the cathode of fuel cells and metal–air batteries. Consequently, designing robust and durable ORR catalysts is vital to developing metal–air batteries and fuel cells. Metal–organic frameworks feature an adjustable structure, a periodic porosity, and a large [...] Read more.
The oxygen reduction reaction is crucial in the cathode of fuel cells and metal–air batteries. Consequently, designing robust and durable ORR catalysts is vital to developing metal–air batteries and fuel cells. Metal–organic frameworks feature an adjustable structure, a periodic porosity, and a large specific surface area, endowing their derivative materials with a unique structure. In this study, F and N co-doped on the carbon support surface (Co/FN-C) via the pyrolysis of ZIF-67 as a sacrificial template while using Co/FN-C as the non-noble metal catalysts. The Co/FN-C displays excellent long-term durability and electrochemical catalytic performance in acidic solutions. These performance improvements are achieved because the CQDs alleviate the structural collapse during the pyrolysis of ZIF-67, which increases the active sites in the Co nanoparticles. Moreover, F- and N-doping improves the catalytic activity of the carbon support by providing additional electrons and active sites. Furthermore, F anions are redox-stable ligands that exhibit long-term operational stability. Therefore, the well-dispersed Co NPs on the surface of the Co/FN-C are promising as the non-noble metal catalysts for ORR. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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14 pages, 4075 KiB  
Article
Effect of Calcination Temperatures on Surface Properties of Spinel ZnAl2O4 Prepared via the Polymeric Citrate Complex Method—Catalytic Performance in Glycerolysis of Urea
by Nhiem Pham-Ngoc, Huy Nguyen-Phu and Eun Woo Shin
Nanomaterials 2023, 13(13), 1901; https://doi.org/10.3390/nano13131901 - 21 Jun 2023
Cited by 1 | Viewed by 923
Abstract
In this study, we investigated urea glycerolysis over ZnAl2O4 catalysts that were prepared by using a citrate complex method and the influence of calcination temperatures on the surface properties of the prepared catalysts by varying the calcination temperature from 550 [...] Read more.
In this study, we investigated urea glycerolysis over ZnAl2O4 catalysts that were prepared by using a citrate complex method and the influence of calcination temperatures on the surface properties of the prepared catalysts by varying the calcination temperature from 550 °C to 850 °C. As the reciprocal substitution between Al3+ and Zn2+ cations led to the formation of a disordered bulk ZnAl2O4 phase, different calcination temperatures strongly influenced the surface properties of the ZnAl2O4 catalysts, including oxygen vacancy. The increase in the calcination temperature from 550 °C to 650 °C decreased the inversion parameter of the ZnAl2O4 structure (from 0.365 to 0.222 for AlO4 and 0.409 to 0.358 for ZnO6). The disordered ZnAl2O4 structure led to a decrease in the surface acidity. The ZnAl2O4-550 catalyst had a large specific surface area, along with highly disordered surface sites, which increased surface acidity, resulting in a stronger interaction of the Zn NCO complex on its surface and an improvement in catalytic performance. Fourier transform infrared and thermogravimetric analysis results of the spent catalysts demonstrated the formation of a greater amount of a solid Zn NCO complex over ZnAl2O4-550 than ZnAl2O4-650. Consequently, the ZnAl2O4-550 catalyst outperformed the ZnAl2O4-650 catalyst in terms of glycerol conversion (72%), glycerol carbonate yield (33%), and byproduct formation. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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19 pages, 4232 KiB  
Article
Catalytic Hydrodechlorination of 4-Chlorophenol by Palladium-Based Catalyst Supported on Alumina and Graphene Materials
by Jintae Jeon, Yuri Park and Yuhoon Hwang
Nanomaterials 2023, 13(9), 1564; https://doi.org/10.3390/nano13091564 - 6 May 2023
Cited by 2 | Viewed by 1683
Abstract
Hydrodechlorination (HDC) is a reaction that involves the use of hydrogen to cleave the C−Cl bond in chlorinated organic compounds such as chlorophenols and chlorobenzenes, thus reducing their toxicity. In this study, a palladium (Pd) catalyst, which is widely used for HDC due [...] Read more.
Hydrodechlorination (HDC) is a reaction that involves the use of hydrogen to cleave the C−Cl bond in chlorinated organic compounds such as chlorophenols and chlorobenzenes, thus reducing their toxicity. In this study, a palladium (Pd) catalyst, which is widely used for HDC due to its advantageous physical and chemical properties, was immobilized on alumina (Pd/Al) and graphene-based materials (graphene oxide and reduced graphene oxide; Pd/GO and Pd/rGO, respectively) to induce the HDC of 4-chlorophenol (4-CP). The effects of the catalyst dosage, initial 4-CP concentration, and pH on 4-CP removal were evaluated. We observed that 4-CP was removed very rapidly when the HDC reaction was induced by Pd/GO and Pd/rGO. The granulation of Pd/rGO using sand was also investigated as a way to facilitate the separation of the catalyst from the treated aqueous solution after use, which is to improve practicality and effectiveness of the use of Pd catalysts with graphene-based support materials in an HDC system. The granulated catalyst (Pd/rGOSC) was employed in a column to induce HDC in a continuous flow reaction, leading to the successful removal of most 4-CP after 48 h. The reaction mechanisms were also determined based on the oxidation state of Pd, which was observed using X-ray photoelectron spectroscopy. Based on the results as a whole, the proposed granulated catalyst has the potential to greatly enhance the practical applicability of HDC for water purification. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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Review

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30 pages, 7397 KiB  
Review
Recent Developments on the Catalytic and Biosensing Applications of Porous Nanomaterials
by Nabanita Pal, Debabrata Chakraborty, Eun-Bum Cho and Jeong Gil Seo
Nanomaterials 2023, 13(15), 2184; https://doi.org/10.3390/nano13152184 - 26 Jul 2023
Cited by 5 | Viewed by 1820
Abstract
Nanoscopic materials have demonstrated a versatile role in almost every emerging field of research. Nanomaterials have come to be one of the most important fields of advanced research today due to its controllable particle size in the nanoscale range, capacity to adopt diverse [...] Read more.
Nanoscopic materials have demonstrated a versatile role in almost every emerging field of research. Nanomaterials have come to be one of the most important fields of advanced research today due to its controllable particle size in the nanoscale range, capacity to adopt diverse forms and morphologies, high surface area, and involvement of transition and non-transition metals. With the introduction of porosity, nanomaterials have become a more promising candidate than their bulk counterparts in catalysis, biomedicine, drug delivery, and other areas. This review intends to compile a self-contained set of papers related to new synthesis methods and versatile applications of porous nanomaterials that can give a realistic picture of current state-of-the-art research, especially for catalysis and sensor area. Especially, we cover various surface functionalization strategies by improving accessibility and mass transfer limitation of catalytic applications for wide variety of materials, including organic and inorganic materials (metals/metal oxides) with covalent porous organic (COFs) and inorganic (silica/carbon) frameworks, constituting solid backgrounds on porous materials. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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41 pages, 4532 KiB  
Review
Carbon Capture Using Porous Silica Materials
by Sumedha M. Amaraweera, Chamila A. Gunathilake, Oneesha H. P. Gunawardene, Rohan S. Dassanayake, Eun-Bum Cho and Yanhai Du
Nanomaterials 2023, 13(14), 2050; https://doi.org/10.3390/nano13142050 - 11 Jul 2023
Cited by 4 | Viewed by 2668
Abstract
As the primary greenhouse gas, CO2 emission has noticeably increased over the past decades resulting in global warming and climate change. Surprisingly, anthropogenic activities have increased atmospheric CO2 by 50% in less than 200 years, causing more frequent and severe rainfall, [...] Read more.
As the primary greenhouse gas, CO2 emission has noticeably increased over the past decades resulting in global warming and climate change. Surprisingly, anthropogenic activities have increased atmospheric CO2 by 50% in less than 200 years, causing more frequent and severe rainfall, snowstorms, flash floods, droughts, heat waves, and rising sea levels in recent times. Hence, reducing the excess CO2 in the atmosphere is imperative to keep the global average temperature rise below 2 °C. Among many CO2 mitigation approaches, CO2 capture using porous materials is considered one of the most promising technologies. Porous solid materials such as carbons, silica, zeolites, hollow fibers, and alumina have been widely investigated in CO2 capture technologies. Interestingly, porous silica-based materials have recently emerged as excellent candidates for CO2 capture technologies due to their unique properties, including high surface area, pore volume, easy surface functionalization, excellent thermal, and mechanical stability, and low cost. Therefore, this review comprehensively covers major CO2 capture processes and their pros and cons, selecting a suitable sorbent, use of liquid amines, and highlights the recent progress of various porous silica materials, including amine-functionalized silica, their reaction mechanisms and synthesis processes. Moreover, CO2 adsorption capacities, gas selectivity, reusability, current challenges, and future directions of porous silica materials have also been discussed. Full article
(This article belongs to the Special Issue New Trends in Mesoporous Materials for Catalysis and Sensors)
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