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Coatings
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Membrane Processes for Water Purification
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Membrane Processes for Water Purification

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (5 August 2021) | Viewed by 14362

Special Issue Editor

Prof. Dr. Stefan Ioan Voicu

E-Mail Website
Guest Editor
1. Advanced Polymer Materials Group, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Bucharest, Romania
2. Department of Analytical Chemistry and Environmental Engineering, Faculty of Chemistry and Materials Science, University Politehnica of Bucharest, 011061 Bucharest, Romania
Interests: synthesis and characterisation of polymeric membranes; biomedical applications of polymeric membranes; functionalization and derivatization of carbon-based nanospecies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Membrane materials and processes represent a continuous expanding domain due to large applications in water purification, biomedical or industrial field. This Special Issue of Coatings is focused on collecting and disseminating original scientific or technical research articles and review papers related to synthesis and characterization of polymeric membrane materials for water purification. The topics include, but are not limited to:

  • Synthesis and characterization of composite membrane materials;
  • Synthesis and characterization of functionalized membrane materials;
  • Membrane materials for water purification by any membrane process;
  • Membrane technology for water purification;
  • Removal of specific organic or inorganic impurities by membrane filtration.

Prof. Dr. Stefan Ioan Voicu
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. Coatings 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 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.

Published Papers (4 papers)

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Research

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15 pages, 5389 KiB  
Article
Synthesis and Characterization of Cellulose Acetate Membranes with Self-Indicating Properties by Changing the Membrane Surface Color for Separation of Gd(III)
by Oana Steluta Serbanescu, Andreea Madalina Pandele, Florin Miculescu and Stefan Ioan Voicu
Coatings 2020, 10(5), 468; https://doi.org/10.3390/coatings10050468 - 10 May 2020
Cited by 33 | Viewed by 4169
Abstract
This study presents a new, revolutionary, and easy method for evaluating the separation process through a membrane that is based on changing the color of the membrane surface during the separation process. For this purpose, a cellulose acetate membrane surface was modified in [...] Read more.
This study presents a new, revolutionary, and easy method for evaluating the separation process through a membrane that is based on changing the color of the membrane surface during the separation process. For this purpose, a cellulose acetate membrane surface was modified in several steps: initially with amino propyl triethoxysilane, followed by glutaraldehyde reaction and calmagite immobilization. Calmagite was chosen for its dual role as a molecule that will complex and retain Gd(III) and also as an indicator for Gd(III). At the contact with the membrane surface, calmagite will actively complex and retain Gd(III), and it will change the color of the membrane surface during the complexation process, showing that the separation occurred. The synthesized materials were characterized by Fourier transform infrared spectroscopy (FT-IR), thermal analysis (TGA-DTA), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy, demonstrating the synthesis of membrane material with self-indicating properties. In addition, in the separation of the Gd(III) process, in which a solution of gadolinium nitrate was used as a source and as a moderator in nuclear reactors, the membrane changed its color from blue to pink. The membrane performances were tested by Induced Coupled Plasma–Mass Spectrometry (ICP-MS) analyses showing a separation process efficiency of 86% relative to the initial feed solution. Full article
(This article belongs to the Special Issue Membrane Processes for Water Purification)
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8 pages, 1258 KiB  
Article
Influence of Water Concentration on Its Mobility in Matrimid®
by Andrey V. Petrov, Michael A. Smirnov, Maria P. Sokolova and Alexander M. Toikka
Coatings 2019, 9(8), 466; https://doi.org/10.3390/coatings9080466 - 25 Jul 2019
Cited by 4 | Viewed by 2520
Abstract
Mobility of water in polyheteroarylene (Matrimid®) was simulated at 300 K and different concentrations of water (0.5 wt.%–3 wt.%). Parameters of anomalous diffusion were calculated from molecular dynamics simulations on the base of mean square displacements of water molecules. It was [...] Read more.
Mobility of water in polyheteroarylene (Matrimid®) was simulated at 300 K and different concentrations of water (0.5 wt.%–3 wt.%). Parameters of anomalous diffusion were calculated from molecular dynamics simulations on the base of mean square displacements of water molecules. It was found that mobility of water has nonmonotonic dependence on its concentration. Lower diffusion rates at concentrations below than 1 wt.% can be attributed to the sorption of water onto the polar groups of polymer (sorption sites). Decreasing of diffusion rate with increasing of water concentration is due to the formation of clusters of water molecules, which hampers the penetration of water between polymer chains. Full article
(This article belongs to the Special Issue Membrane Processes for Water Purification)
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11 pages, 3419 KiB  
Article
Removal of Dyes and Cd2+ in Water by Kaolin/Calcium Alginate Filtration Membrane
by Yujie Zhao, Xiaowei Liu, Meng Qi, Tian Bai, Kongyin Zhao and Xinxin Zhang
Coatings 2019, 9(4), 218; https://doi.org/10.3390/coatings9040218 - 28 Mar 2019
Cited by 25 | Viewed by 3210
Abstract
Kaolin/calcium alginate (kaolin/CaAlg) free-standing membranes were prepared by adding different amounts of Kaolin into the sodium alginate (NaAlg) casting solution and crosslinked by Ca2+ using urea as porogen agent. The morphology of the kaolin/CaAlg filtration membrane was characterized by scanning electron microscope [...] Read more.
Kaolin/calcium alginate (kaolin/CaAlg) free-standing membranes were prepared by adding different amounts of Kaolin into the sodium alginate (NaAlg) casting solution and crosslinked by Ca2+ using urea as porogen agent. The morphology of the kaolin/CaAlg filtration membrane was characterized by scanning electron microscope (SEM). Then the kaolin/CaAlg membrane was used for the removal of dyes and Cd2+. The kaolin significantly improved the mechanical behavior and flux of the kaolin/CaAlg membrane. The flux reached 17.53 L/m2·h at 0.1 MPa and when the content of Kaolin in NaAlg was 70 wt.%. The filtration of BSA solution and oil-water emulsion indicated that the kaolin/CaAlg composite filtration membrane exhibited good anti-fouling properties. The rejection of Brilliant Blue G250, Congo red, and methylene blue by the kaolin/CaAlg filtration membrane was 100%, 95.22%, and 62.86%, respectively. The removal rate of Cd2+ reached 99.69%, with a flux of 17.06 L/m2·h at 0.1 MPa. Full article
(This article belongs to the Special Issue Membrane Processes for Water Purification)
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Review

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27 pages, 6446 KiB  
Review
Polysulfone Composite Membranes with Carbonaceous Structure. Synthesis and Applications
by Andreea Madalina Pandele, Oana Steluta Serbanescu and Stefan Ioan Voicu
Coatings 2020, 10(7), 609; https://doi.org/10.3390/coatings10070609 - 28 Jun 2020
Cited by 18 | Viewed by 3637
Abstract
The present review deals with the latest progress in the field of polysulfone composite membranes with carbon nanotubes, carbon fiber and graphene from both perspectives-synthesis and applications. These two fillers, extensively used in the last few years due to their remarkable properties, induce [...] Read more.
The present review deals with the latest progress in the field of polysulfone composite membranes with carbon nanotubes, carbon fiber and graphene from both perspectives-synthesis and applications. These two fillers, extensively used in the last few years due to their remarkable properties, induce a high value character to the composite materials. On the other hand, polysulfone is one the most used polymers for preparing polymeric membranes due to its high versatility in a wide range of solvents and also to the properties of this remarkable polymer. All types of synthesis method were presented and also a large number of applications from industrial to biomedical were presented and discussed. Full article
(This article belongs to the Special Issue Membrane Processes for Water Purification)
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