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Recent Advances in Polymer and Polymer Composite Membranes

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

Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 2166

Special Issue Editor


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Guest Editor
Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, Bucharest, Romania
Interests: polymers; biopolymers; membranes; wastewater; pollutants; hybrid films; electrochemistry; corrosion; membrane separation processes
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Special Issue Information

Dear Colleagues,

Polymeric membranes that contain natural or synthetic polymers and biopolymers are considered a new and promising approach for water purification applications (e.g., electrodialysis, ultrafiltration, reverse osmosis, microfiltration nanofiltration) due to their advantages, such as high separation efficiency, high selectivity, increased life span, feasibility, the ability to remove or recover metal ions and to remove organic or inorganic colloids, bacteria or other microorganisms, high flux, good mechanical, thermal, and chemical stability, low cost, and minimum maintenance.

The membranes that contain natural polymers or biopolymers such as cellulose and chitin along with their derivatives, starch, alginate, poly (lactic acid), silk and poly (butylene succinate), represent a new potential application in the field of water treatment membranes.

The aim of this Special Issue is to highlight the synthesis, characterization, and applications of polymeric membranes.

Dr. Simona Caprarescu
Guest Editor

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Keywords

  • Polymers
  • Biopolymers
  • Composite membranes
  • Polymer membranes
  • Characterization of membranes
  • Membrane processes

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Published Papers (1 paper)

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Research

18 pages, 9408 KiB  
Article
Nitrogen Functionalization of CVD Grown Three-Dimensional Graphene Foam for Hydrogen Evolution Reactions in Alkaline Media
by Daniela Ion-Ebrașu, Radu Dorin Andrei, Stanică Enache, Simona Căprărescu, Constantin Cătălin Negrilă, Cătălin Jianu, Adrian Enache, Iulian Boerașu, Elena Carcadea, Mihai Varlam, Bogdan Ștefan Vasile and Jianwei Ren
Materials 2021, 14(17), 4952; https://doi.org/10.3390/ma14174952 - 30 Aug 2021
Cited by 17 | Viewed by 2415
Abstract
Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing [...] Read more.
Three-dimensional graphene foam (3D-GrFoam) is a highly porous structure and sustained lattice formed by graphene layers with sp2 and sp3 hybridized carbon. In this work, chemical vapor deposition (CVD)—grown 3D-GrFoam was nitrogen-doped and platinum functionalized using hydrothermal treatment with different reducing agents (i.e., urea, hydrazine, ammonia, and dihydrogen hexachloroplatinate (IV) hydrate, respectively). X-ray photoelectron spectroscopy (XPS) survey showed that the most electrochemically active nitrogen-doped sample (GrFoam3N) contained 1.8 at % of N, and it exhibited a 172 mV dec−1 Tafel plot associated with the Volmer–Heyrovsky hydrogen evolution (HER) mechanism in 0.1 M KOH. By the hydrothermal process, 0.2 at % of platinum was anchored to the graphene foam surface, and the resultant sample of GrFoamPt yielded a value of 80 mV dec−1 Tafel associated with the Volmer–Tafel HER mechanism. Furthermore, Raman and infrared spectroscopy analysis, as well as scanning electron microscopy (SEM) were carried out to understand the structure of the samples. Full article
(This article belongs to the Special Issue Recent Advances in Polymer and Polymer Composite Membranes)
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