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Mesoporous Silica and Their Applications
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Mesoporous Silica and Their Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 11181

Special Issue Editors

Dr. Enrica Gianotti

E-Mail Website
Guest Editor
Department of Sustainable Development and Ecological Transition, University of Eastern Piedmont, Vercelli, Italy
Interests: heterogeneous catalysis; organic–inorganic interfaces; synthesis of nanomaterials; in situ physicochemical characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Ivana Miletto

E-Mail Website
Guest Editor
Dipartimento di Scienze del Farmaco, Università del Piemonte Orientale, Largo Donegani, 2, 28100 Novara, Italy
Interests: fluorescence; material science; physical chemistry; NIR dyes; photodynamic therapy; hybrid materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ordered and non-ordered mesoporous silicas have been considered fascinating materials for many technological applications due to their porous structure and morphological features. The possibility of a controlled chemical modification with functional moieties (organic molecules, enzymes, organometallic compounds, metallic nanoparticles, etc.) has opened new routes to facing the challenges of the new millennium. Research towards green synthetic methodologies to produce functional mesoporous silicas is highly desirable to match contemporary economic and environmental sustainability issues.

This Special Issue of Materials is aimed at providing an overview on the many aspects of mesoporous silicas, including smart design, advanced and green synthetic approaches, physicochemical characterization, computational modeling, and structure–properties correlations, in different type of applications: Heterogeneous catalysis and biocatalysis, nanomedicine, bioremediation, etc.

We invite you to submit a full paper, communication or review article to support this Special Issue, "Mesoporous Silicas and their Applications".

Dr. Ivana Miletto
Prof. Enrica Gianotti
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. Materials 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 2600 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

  • green synthetic methodologies
  • smart functionalization
  • green catalysis application
  • nanomedicine application
  • bioremediation application
  • functional mesoporous silica
  • organic–inorganic interfaces
  • molecular scale characterization
  • computational modeling

Published Papers (5 papers)

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Research

15 pages, 3471 KiB  
Article
Can Mesoporous Silica Speed Up Degradation of Benzodiazepines? Hints from Quantum Mechanical Investigations
by Massimo Delle Piane and Marta Corno
Materials 2022, 15(4), 1357; https://doi.org/10.3390/ma15041357 - 12 Feb 2022
Cited by 2 | Viewed by 1612
Abstract
This work reports for the first time a quantum mechanical study of the interactions of a model benzodiazepine drug, i.e., nitrazepam, with various models of amorphous silica surfaces, differing in structural and interface properties. The interest in these systems is related to the [...] Read more.
This work reports for the first time a quantum mechanical study of the interactions of a model benzodiazepine drug, i.e., nitrazepam, with various models of amorphous silica surfaces, differing in structural and interface properties. The interest in these systems is related to the use of mesoporous silica as carrier in drug delivery. The adopted computational procedure has been chosen to investigate whether silica–drug interactions favor the drug degradation mechanism or not, hindering the beneficial pharmaceutical effect. Computed structural, energetics, and vibrational properties represent a relevant comparison for future experiments. Our simulations demonstrate that adsorption of nitrazepam on amorphous silica is a strongly exothermic process in which a partial proton transfer from the surface to the drug is observed, highlighting a possible catalytic role of silica in the degradation reaction of benzodiazepines. Full article
(This article belongs to the Special Issue Mesoporous Silica and Their Applications)
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18 pages, 4015 KiB  
Article
Sol-Gel Processed Cobalt-Doped Methylated Silica Membranes Calcined under N2 Atmosphere: Microstructure and Hydrogen Perm-Selectivity
by Lunwei Wang, Jing Yang, Ruihua Mu, Yingming Guo and Haiyun Hou
Materials 2021, 14(15), 4188; https://doi.org/10.3390/ma14154188 - 27 Jul 2021
Cited by 6 | Viewed by 1486
Abstract
Methyl-modified, cobalt-doped silica (Co/MSiO2) materials were synthesized by sol-gel technique calcined in N2 atmospheres, and membranes were made thereof by coating method. The effects of Co/Si molar ratio (nCo) on the physical-chemical constructions of Co/MSiO2 materials [...] Read more.
Methyl-modified, cobalt-doped silica (Co/MSiO2) materials were synthesized by sol-gel technique calcined in N2 atmospheres, and membranes were made thereof by coating method. The effects of Co/Si molar ratio (nCo) on the physical-chemical constructions of Co/MSiO2 materials and microstructures of Co/MSiO2 membranes were systematically investigated. The gas permeance performance and hydrothermal stability of Co/MSiO2 membranes were also tested. The results show that the cobalt element in Co/MSiO2 material calcined at 400 °C exists not only as Si–O–Co bond but also as Co3O4 and CoO crystals. The introduction of metallic cobalt and methyl can enlarge the total pore volume and average pore size of the SiO2 membrane. The activation energy (Ea) values of H2, CO2, and N2 for Co/MSiO2 membranes are less than those for MSiO2 membranes. When operating at a pressure difference of 0.2 MPa and 200 °C compared with MSiO2 membrane, the permeances of H2, CO2, and N2 for Co/MSiO2 membrane with nCo = 0.08 increased by 1.17, 0.70, and 0.83 times, respectively, and the perm-selectivities of H2/CO2 and H2/N2 increased by 27.66% and 18.53%, respectively. After being steamed and thermally regenerated, the change of H2 permeance and H2 perm-selectivities for Co/MSiO2 membrane is much smaller than those for MSiO2 membrane. Full article
(This article belongs to the Special Issue Mesoporous Silica and Their Applications)
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17 pages, 2760 KiB  
Article
Effect of Modification of Amorphous Silica with Ammonium Agents on the Physicochemical Properties and Hydrogenation Activity of Ir/SiO2 Catalysts
by Monika Kot, Robert Wojcieszak, Ewa Janiszewska, Mariusz Pietrowski and Michał Zieliński
Materials 2021, 14(4), 968; https://doi.org/10.3390/ma14040968 - 18 Feb 2021
Cited by 9 | Viewed by 2285
Abstract
The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the [...] Read more.
The modification of commercial silica with solutions of NH4F or NH4Cl salts, followed by thermal treatment, enabled generation of the acidic sites in SiO2 and changed its textural properties. The use of ammonium salts solution also caused the generation of additional porosity. Using NH4F solution caused significant decrease in the specific surface area and the increase in the average pore diameter. The number and strength of resulting acid sites depend on the nature of anion in the applied ammonium salt and the concentration of salt solution. It has been found that the sample treated with NH4F presented higher total acidity (TPD–NH3) and the amount as well as the strength of acid sites increased with the concentration of the used modifier. As modified amorphous SiO2 materials used as a support for iridium (1 wt %, Ir(acac)3) nanoparticles permitted to obtain highly active catalysts for toluene hydrogenation under atmospheric pressure. The highest activity (expressed as the apparent rate and TOF) was obtained for iridium catalysts supported on silica modified by NH4F with the highest acidity. The modification of silica with NH4F favors the generation of centers able to adsorb toluene, which results in higher activity of this catalyst. Full article
(This article belongs to the Special Issue Mesoporous Silica and Their Applications)
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16 pages, 3116 KiB  
Article
Toluene Adsorption by Mesoporous Silicas with Different Textural Properties: A Model Study for VOCs Retention and Water Remediation
by Chiara Vittoni, Giorgio Gatti, Ilaria Braschi, Enrico Buscaroli, Giovanni Golemme, Leonardo Marchese and Chiara Bisio
Materials 2020, 13(12), 2690; https://doi.org/10.3390/ma13122690 - 12 Jun 2020
Cited by 4 | Viewed by 1979
Abstract
In this work, different mesoporous silicas were studied as potential sorbents for toluene, selected as a model molecule of aromatic organic fuel-based pollutants. Three siliceous materials with different textural and surface properties (i.e., fumed silica and mesoporous Santa Barbara Amorphous (SBA)-15 and Mobil [...] Read more.
In this work, different mesoporous silicas were studied as potential sorbents for toluene, selected as a model molecule of aromatic organic fuel-based pollutants. Three siliceous materials with different textural and surface properties (i.e., fumed silica and mesoporous Santa Barbara Amorphous (SBA)-15 and Mobil Composition of matter (MCM)-41 materials) were considered and the effect of their physico-chemical properties on the toluene adsorption process was studied. In particular, FT-IR spectroscopy was used to qualitatively study the interactions between the toluene molecule and the surface of silicas, while volumetric adsorption analysis allowed the quantitative determination of the toluene adsorption capacity. The combined use of these techniques revealed that textural properties of the sorbents, primarily porosity, are the driving forces that control the adsorption process. Considering that, under real conditions of usage, the sorbents are soaked in water, their hydrothermal stability was also investigated and toluene adsorption by both the gas and aqueous phase on hydrothermally pre-treated samples was studied. The presence of ordered porosity, together with the different pore size distribution and the amount of silanol groups, strongly affected the adsorption process. In toluene adsorption from water, SBA-15 performed better than MCM-41. Full article
(This article belongs to the Special Issue Mesoporous Silica and Their Applications)
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15 pages, 3882 KiB  
Article
SBA-16 Cage-Like Porous Material Modified with APTES as an Adsorbent for Pb2+ Ions Removal from Aqueous Solution
by Viviana Palos-Barba, Abigail Moreno-Martell, Verónica Hernández-Morales, Carmen L. Peza-Ledesma, Eric M. Rivera-Muñoz, Rufino Nava and Barbara Pawelec
Materials 2020, 13(4), 927; https://doi.org/10.3390/ma13040927 - 19 Feb 2020
Cited by 17 | Viewed by 2689
Abstract
Tridimensional cubic mesoporous silica, SBA-16, functionalized with aminopropyl groups, were employed as adsorbents for Pb2+ ion removal from aqueous solution. The adsorption capacity was investigated for the effect of pH, contact time, temperature, and concentration of 3-aminopropyltriethoxysilane (APTES) employed for adsorbent functionalization. [...] Read more.
Tridimensional cubic mesoporous silica, SBA-16, functionalized with aminopropyl groups, were employed as adsorbents for Pb2+ ion removal from aqueous solution. The adsorption capacity was investigated for the effect of pH, contact time, temperature, and concentration of 3-aminopropyltriethoxysilane (APTES) employed for adsorbent functionalization. The textural properties and morphology of the adsorbents were evaluated by N2 physisorption, small-angle X-ray diffraction (XRD), diffuse reflectance spectroscopy (UV-vis), and transmission electron microscopy (TEM). The functionalization of the SBA-16 was evaluated by elemental analysis (N), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Batch adsorption studies show that the total Pb2+ ions removal was archived on adsorbent having an optimized amount of aminopropyl groups (2N-SBA-16). The maximum of Pb2+ ions removal occurred at optimized adsorption conditions: pH = 5–6, contact time 40 min, and at a low initial lead concentration in solution (200 mg L−1). Under the same adsorption conditions, the amino-functionalized SBA-16 with cubic 3D unit cell structure exhibited higher adsorption capability than its SBA-15 counterpart with uniform mesoporous channels. Full article
(This article belongs to the Special Issue Mesoporous Silica and Their Applications)
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