E-Mail Alert

Add your e-mail address to receive forthcoming issues of this journal:

Journal Browser

Journal Browser

Special Issue "Advances in Porous Materials"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 31 August 2019

Special Issue Editor

Guest Editor
Prof. Takei Takahiro

Center for Crystal Science and Technology, University of Yamanashi, Kofu, Japan
Website | E-Mail
Interests: environmental materials; catalyst; adsorbent; electrochemical capacitor

Special Issue Information

Dear Colleagues,

Porous materials distribute widely and act as very important roles in each field. Especially, porous materials have various characteristics depending on pore size, surface property of the pore wall, pore array and local structure of the pore wall, and can be used as adsorbents, separators, thermal insulators, acoustic absorbents, photonics, their electric properties, and so on. Accordingly, papers on porous materials are dispersed in many fields, and, unfortunately, many common hints for synthesis and the characteristics of porous materials are scattered.  Therefore, this Special Issue invites the submission of works related to porous materials and their applications in many fields. To prepare appropriate porous materials for each purpose, the Special Issue may be very useful for the readers. For the authors, the issue will be a good opportunity for publication after peer review by expert researchers of porous materials. Review articles by experts in the field will also be welcome.

Prof. Takei Takahiro
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 papers will be 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. Molecules 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 1800 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

  • microporous and mesoporous materials
  • separator
  • adsorbent
  • molecular sieve
  • zeolite
  • thermal insulator

Published Papers (6 papers)

View options order results:
result details:
Displaying articles 1-6
Export citation of selected articles as:

Research

Open AccessArticle
Combined Minimum-Run Resolution IV and Central Composite Design for Optimized Removal of the Tetracycline Drug Over Metal–Organic Framework-Templated Porous Carbon
Molecules 2019, 24(10), 1887; https://doi.org/10.3390/molecules24101887
Received: 4 March 2019 / Revised: 25 April 2019 / Accepted: 7 May 2019 / Published: 16 May 2019
PDF Full-text (4391 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In this study, a minimum-run resolution IV and central composite design have been developed to optimize tetracycline removal efficiency over mesoporous carbon derived from the metal-organic framework MIL-53 (Fe) as a self-sacrificial template. Firstly, minimum-run resolution IV, powered by the Design–Expert program, was [...] Read more.
In this study, a minimum-run resolution IV and central composite design have been developed to optimize tetracycline removal efficiency over mesoporous carbon derived from the metal-organic framework MIL-53 (Fe) as a self-sacrificial template. Firstly, minimum-run resolution IV, powered by the Design–Expert program, was used as an efficient and reliable screening study for investigating a set of seven factors, these were: tetracycline concentration (A: 5–15 mg/g), dose of mesoporous carbons (MPC) (B: 0.05–0.15 g/L), initial pH level (C: 2–10), contact time (D: 1–3 h), temperature (E: 20–40 °C), shaking speed (F: 150–250 rpm), and Na+ ionic strength (G: 10–90 mM) at both low (−1) and high (+1) levels, for investigation of the data ranges. The 20-trial model was analyzed and assessed by Analysis of Variance (ANOVA) data, and diagnostic plots (e.g., the Pareto chart, and half-normal and normal probability plots). Based on minimum-run resolution IV, three factors, including tetracycline concentration (A), dose of MPC (B), and initial pH (C), were selected to carry out the optimization study using a central composite design. The proposed quadratic model was found to be statistically significant at the 95% confidence level due to a low P-value (<0.05), high R2 (0.9078), and the AP ratio (11.4), along with an abundance of diagnostic plots (3D response surfaces, Cook’s distance, Box-Cox, DFFITS, Leverage versus run, residuals versus runs, and actual versus predicted). Under response surface methodology-optimized conditions (e.g., tetracycline concentration of 1.9 mg/g, MPC dose of 0.15 g/L, and pH level of 3.9), the highest tetracycline removal efficiency via confirmation tests reached up to 98.0%–99.7%. Also, kinetic intraparticle diffusion and isotherm models were systematically studied to interpret how tetracycline molecules were absorbed on an MPC structure. In particular, the adsorption mechanisms including “electrostatic attraction” and “π–π interaction” were proposed. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Graphical abstract

Open AccessArticle
Ethylene Adsorption Using Cobalt Oxide-Loaded Polymer-Derived Nanoporous Carbon and Its Application to Extend Shelf Life of Fruit
Molecules 2019, 24(8), 1507; https://doi.org/10.3390/molecules24081507
Received: 20 February 2019 / Revised: 9 April 2019 / Accepted: 15 April 2019 / Published: 17 April 2019
PDF Full-text (2173 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Suppressing the amount of ethylene during storage has been of interest as a method to enhance shelf life of fruit. In this work, ethylene removal by adsorption using cobalt oxide-impregnated nanoporous carbon has been studied. Nanoporous carbon with a high surface area up [...] Read more.
Suppressing the amount of ethylene during storage has been of interest as a method to enhance shelf life of fruit. In this work, ethylene removal by adsorption using cobalt oxide-impregnated nanoporous carbon has been studied. Nanoporous carbon with a high surface area up to 2400 m2 g−1 was prepared by carbonization process biomass and synthetic polymer at 850 °C. Dispersion of cobalt oxide on porous carbon surface was carried out by an incipient wetness procedure followed by calcination process at 200 °C. Ethylene adsorption test was performed using a volumetric method in an ultrahigh vacuum rig constructed by Swagelok VCR® fittings. The results showed that the cobalt oxide/carbon system had significant ethylene adsorption capacity. Ethylene uptake increases with the increasing cobalt oxide loading on the carbon. The highest ethylene capacity of 16 mol kg−1 adsorbent was obtained by using 30 wt.% (weight percentage) of cobalt oxide dispersed in polymer-derived carbon. In closed storage, the ratio of 15 g adsorbent/kg fruit may extend the storage life up to 12 d, higher than that without adsorbent (3 d). Therefore, the results demonstrate the great potential use of cobalt oxide-impregnated nanoporous carbon as an adsorbent for ethylene removal during storage of fruit. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Graphical abstract

Open AccessArticle
Peel and Penetration Resistance of Porous Polyethylene Terephthalate Material Produced by CO2-Assisted Polymer Compression
Molecules 2019, 24(7), 1384; https://doi.org/10.3390/molecules24071384
Received: 23 February 2019 / Revised: 4 April 2019 / Accepted: 8 April 2019 / Published: 9 April 2019
Cited by 1 | PDF Full-text (10734 KB) | HTML Full-text | XML Full-text
Abstract
CO2-assisted polymer compression (CAPC) involves adhering fiber sheets without impurities at room temperature and producing porous materials suitable for use in medical and skin-contactable products. The mechanical strength of the resultant porous material has not yet been reported. The penetration resistance [...] Read more.
CO2-assisted polymer compression (CAPC) involves adhering fiber sheets without impurities at room temperature and producing porous materials suitable for use in medical and skin-contactable products. The mechanical strength of the resultant porous material has not yet been reported. The penetration resistance of the CAPC material, which is a laminated material comprising fibrous polymer sheets, was measured, and this increased gradually with the density. Additionally, a T-type peel test was performed on the CAPC material, and the peel resistance increased rapidly with the density. The peel resistance enhancement is effectively explained by the cross-sectional analysis model. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Graphical abstract

Open AccessCommunication
Ginger Straw Waste-Derived Porous Carbons as Effective Adsorbents toward Methylene Blue
Molecules 2019, 24(3), 469; https://doi.org/10.3390/molecules24030469
Received: 6 January 2019 / Revised: 20 January 2019 / Accepted: 24 January 2019 / Published: 28 January 2019
PDF Full-text (3069 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In this work, ginger straw waste-derived porous carbons, with high adsorption capacity, high adsorption rate, and good reusability for removing the toxic dye of methylene blue from wastewater, were prepared by a facile method under oxygen-limiting conditions. This study opens a new approach [...] Read more.
In this work, ginger straw waste-derived porous carbons, with high adsorption capacity, high adsorption rate, and good reusability for removing the toxic dye of methylene blue from wastewater, were prepared by a facile method under oxygen-limiting conditions. This study opens a new approach for the utilization of ginger straw waste, and the porous materials can be employed as great potential adsorbents for treating dye wastewater. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Figure 1

Open AccessArticle
Dual Functional S-Doped g-C3N4 Pinhole Porous Nanosheets for Selective Fluorescence Sensing of Ag+ and Visible-Light Photocatalysis of Dyes
Molecules 2019, 24(3), 450; https://doi.org/10.3390/molecules24030450
Received: 13 December 2018 / Revised: 25 January 2019 / Accepted: 27 January 2019 / Published: 27 January 2019
Cited by 1 | PDF Full-text (4246 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
This study explores the facile, template-free synthesis of S-doped g-C3N4 pinhole nanosheets (SCNPNS) with porous structure for fluorescence sensing of Ag+ ions and visible-light photocatalysis of dyes. As-synthesized SCNPNS samples were characterized by various analytical tools such as XRD, [...] Read more.
This study explores the facile, template-free synthesis of S-doped g-C3N4 pinhole nanosheets (SCNPNS) with porous structure for fluorescence sensing of Ag+ ions and visible-light photocatalysis of dyes. As-synthesized SCNPNS samples were characterized by various analytical tools such as XRD, FT-IR, TEM, BET, XPS, and UV–vis spectroscopy. At optimal conditions, the detection linear range for Ag+ was found to be from 0 to 1000 nM, showing the limit of detection (LOD) of 57 nM. The SCNPNS exhibited highly sensitive and selective detection of Ag+ due to a significant fluorescence quenching via photo-induced electron transfer through Ag+–SCNPNS complex. Moreover, the SCNPNS exhibited 90% degradation for cationic methylene blue (MB) dye within 180 min under visible light. The enhanced photocatalytic activity of the SCNPNS was attributed to its negative zeta potential for electrostatic interaction with cationic dyes, and the pinhole porous structure can provide more active sites which can induce faster transport of the charge carrier over the surface. Our SCNPNS is proposed as an environmental safety tool due to several advantages, such as low cost, facile preparation, selective recognition of Ag+ ions, and efficient photocatalytic degradation of cationic dyes under visible light. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Graphical abstract

Open AccessArticle
Mechanisms of Methylparaben Adsorption onto Activated Carbons: Removal Tests Supported by a Calorimetric Study of the Adsorbent–Adsorbate Interactions
Molecules 2019, 24(3), 413; https://doi.org/10.3390/molecules24030413
Received: 19 November 2018 / Revised: 12 January 2019 / Accepted: 20 January 2019 / Published: 23 January 2019
PDF Full-text (2171 KB) | HTML Full-text | XML Full-text
Abstract
In this study, the mechanisms of methylparaben adsorption onto activated carbon (AC) are elucidated starting from equilibrium and thermodynamic data. Adsorption tests are carried out on three ACs with different surface chemistry, in different pH and ionic strength aqueous solutions. Experimental results show [...] Read more.
In this study, the mechanisms of methylparaben adsorption onto activated carbon (AC) are elucidated starting from equilibrium and thermodynamic data. Adsorption tests are carried out on three ACs with different surface chemistry, in different pH and ionic strength aqueous solutions. Experimental results show that the methylparaben adsorption capacity is slightly affected by pH changes, while it is significantly reduced in the presence of high ionic strength. In particular, methylparaben adsorption is directly dependent on the micropore volume of the ACs and the π- stacking interactions, the latter representing the main interaction mechanism of methylparaben adsorption from liquid phase. The equilibrium adsorption data are complemented with novel calorimetric data that allow calculation of the enthalpy change associated with the interactions between solvent-adsorbent, adsorbent-adsorbate and the contribution of the ester functional group (in the methylparaben structure) to the adsorbate–adsorbent interactions, in different pH and ionic strength conditions. It was determined that the interaction enthalpy of methylparaben-AC in water increases (absolute value) slightly with the basicity of the activated carbons, due to the formation of interactions with π- electrons and basic functional groups of ACs. The contribution of the ester group to the adsorbate-adsorbent interactions occurs only in the presence of phenol groups on AC by the formation of Brønsted–Lowry acid–base interactions. Full article
(This article belongs to the Special Issue Advances in Porous Materials)
Figures

Figure 1

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Author: N. Kadam, Md. Moniruzzaman, Sang-Wha Lee*

Title:  Dual functional S-doped g-C3N4 pinhole porous nanosheets for selective fluorescence sensing of Ag+ and enhanced photocatalytic degradation of cationic dyes

Abstract: This study explores the one-pot template free synthesis of S-doped g-C3N4 pinhole nanosheets (SCNPNS) for fluorescence sensing of Ag+ ions and enhanced photocatalytic degradation of cationic dyes under visible light. As-synthesized SCNPNS were subsequently characterized by various analytical tools such as XRD, FT-IR, TEM, XPS, and UV-vis spectroscopy. At optimal conditions, the detection linear range for Ag+ was found to be from 0 to 1000 nM, with a detection limit (LOD) of 57 nM. The sensing system of SCNPNS is highly sensitive and selective detection of Ag+ due to its fluorescence quenching via photoinduced electron transfer through Ag+ combined SCNPNS. Moreover, the SCNPNS exhibited 90% degradation for cationic methylene blue (MB) dye within 180 min but only 14% degradation for anionic methyl orange (MO) dye under visible light irradiation. The enhanced photocatalytic activity of the SCNPNS was attributed to its negative zeta potential for electrostatic attraction with cationic dye and the pinhole porous structure that results in a faster transfer of the charge carrier on the surface. After all, our SCNPNS is endorsed as an environmental safety tool due to several advantages, such as low cost, easy preparation, selective recognition of Ag+ ions, and efficient photocatalytic degradation of cationic dyes under visible light.

Keywords: S-doped g-C3N4; Pinhole porous nanosheet; Ag+ ions; fluorescence sensing; Visible light; Photocatalytic degradation; Cationic dyes

Authors: WILFRIED SCHRANZ and VIKTOR SOPRUNYUK
Affiliation:Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria
Title:WATER IN NANO-POROUS CONFINEMENT: GLASS-TO-LIQUID TRANSITION OR FREEZING OF MOLECULAR REORIENTATION DYNAMICS?
Abstract: First mechanical relaxation measurements (f = 400 Hz) of water confined in micro-porous silica have been performed more than 40 years ago. The authors reported a so called “capillary transition” of water in the core of the pores and a second one at lower temperature, which they called the “adsorbate transition” related to water near the surface of the pores. The “capillary transition” was identified with freezing of water in the centre of the pores, but even 40 years later, the origin of the “adsorbate transition” is not yet clear. One group of authors relates it to the glass-to-liquid transition of a thin film (few layers) of supercooled water in the pores, and another one to a freezing of proton reorientations at lattice defects. In the present work we show data from extensive DMA measurements (f = 0.1 Hz – 70 Hz) of water confined in nanoporous silica (d = 2.5, 5 and 10 nm), which are in favour of the glass-to-liquid scenario.

Authors: T. Wejrzanowski1, K. Cwieka1, J. Skibinski1, S. Haj Ibrahim1, A. Lysik1, J. Milewski2
Affiliation: 1Warsaw University of Technology, Faculty of Materials Science and Engineering Woloska 141, 02507 Warsaw, Poland
2Warsaw University of Technology, Institute of Heat Engineering, Nowowiejska 21/25, 00665 Warsaw, Poland
Title: Microstructure of open-porous materials for high temperature catalysis
Abstract: Open-porous materials combine both structural and functional properties in various applications. This can be especially seen in materials for catalysis, where mechanical strength, transport of reagents and surface reactivity are optimized by the design of microstructure and chemical composition.
Present studies are dedicated to high temperature fuel cells, namely Molten Carbonate Fuel Cells (MCFC) and Solid Oxide Fuel Cells (SOFC), which operate at temperature above 600°C.  Due to such conditions they exhibit high tolerance to the fuel type and impurities, but in particular, low cost catalytic materials (Noble metal free) can be applied.
The comprehensive design of high temperature fuel cell materials encompasses the optimization of both: chemical composition and microstructure. Since the chemical composition influences corrosion resistance and catalytic activity of the surface, the microstructure is crucial when the transport and interaction/exchange of gas molecules, electrons and ions are considered.
Within these studies a deeper insight into the understanding of the influence of porosity, pore size distribution, specific surface area and other microstructure parameters on the performance of fuel cells is achieved at by the complementary application of advanced experimental techniques and numerical simulations.

Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top