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Synthesis and Characterization of Nanocomposites and Functional Coatings for Water...
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Synthesis and Characterization of Nanocomposites and Functional Coatings for Water Purification

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 4759

Special Issue Editor

Dr. Simona Filice

E-Mail Website
Guest Editor
CNR IMM-Istituto per la Microelettronica e i Microsistemi, Sede di Catania, Strada VIII n. 5, Zona Industriale, 95121 Catania, Italy
Interests: nanomaterials; polymeric nanocomposites; for water purification; adsorption; photocatalysis; filtration; hydrogen production by water splitting; sensors for environment and biological applications; carbon quantum dots

Special Issue Information

Dear Colleagues,

Currently, the prevention of environmental pollution caused by inorganic and organic toxic chemical compounds has recently focused the attention of the scientific community. The most investigated remediation techniques involve filtration, adsorption, and photocatalytic degradation using materials that are low cost and reusable after appropriate regeneration (such as graphene oxide, clay minerals, TiO2, Bi2O3, and iron compounds). Regardless of this, the use of nanomaterials directly dispersed in water has some practical limitations, such as the production of sludge as secondary pollution and the failure to recover and reuse the catalyst. To overcome these problems, the incorporation of nanomaterials into a polymeric matrix is a successful strategy: in this way, catalyst performances are increased by a larger surface area and composites can be easily removed at the end of the process, regenerated, and reused. Furthermore, polymeric functional nanocomposites can also be used as active coating of commercial materials to increase their performances and reduce costs.

This Special Issue will serve as a forum for papers on the following topics:

  • The use of nanomaterials (i.e., carbon nanomaterials, metallic or semiconductor nanoparticles, clays) and polymeric nanocomposites for adsorption, filtration, or photocatalytic degradation of water pollutants;
  • Synthesis and functionalization methodologies of nanostructures and polymeric nanocomposites;
  • Methodologies for the preparation of active coating; structural and physicochemical characterization of materials;
  • Applications in filtering, adsorption, and photocatalytic processes for water purification;
  • Investigation of antimicrobial and antibiofouling coating properties.

Manuscripts can be submitted in the following formats: full research papers, communications, and reviews.

Dr. Simona Filice
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.

Keywords

  • antimicrobial and antibiofouling coating
  • active coating
  • synthesis and characterization of nanomaterials and polymeric nanocomposites
  • surface functionalization
  • photocatalytic, filtering, and adsorption properties
  • water purification

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

13 pages, 11060 KiB  
Article
Facile Fabrication of High-Performance Superhydrophobic Reusable Oil-Absorbing Sponges
by Rabiga Kudaibergenova, Yerzhigit Sugurbekov, Gulzat Demeuova and Gulnar Sugurbekova
Coatings 2023, 13(10), 1777; https://doi.org/10.3390/coatings13101777 - 16 Oct 2023
Cited by 4 | Viewed by 1600
Abstract
Wastewater treatment from oil, oil products and organic mixtures is a very relevant topic that can be successfully utilized to solve problems of severe environmental pollution, such as oil spills, industrial oily wastewater discharges and water treatment in the water treatment process. In [...] Read more.
Wastewater treatment from oil, oil products and organic mixtures is a very relevant topic that can be successfully utilized to solve problems of severe environmental pollution, such as oil spills, industrial oily wastewater discharges and water treatment in the water treatment process. In this work, we have developed new superhydrophobic magnetic polyurethane (PU) sponges, functionalized with reduced graphene oxide (RGO), MgFe2O4 nanoparticles, and silicone oil AS 100 (SO), as a selective and reusable sorbent for the purification and separation of wastewater from oil and organic solvents. The surface morphology and wettability of the sponge surface were characterized by scanning electron microscopy (SEM) and a contact angle analysis system, respectively. The results showed that the obtained PU sponge PU/RGO/MgFe2O4/SO had excellent mechanical and water-repellent properties, good reusability (lasted more than 20 cycles), as well as fast (immersion time 20 s) and excellent absorption capacity (16.61–44.86 g/g), and additional good magnetic properties, which made it easy to separate the sponge from the water with a magnet. The presence of RGO in the composition of the nanomaterial improves the separating and cleaning properties of the materials and also leads to an increase in the absorption capacity of oil and various organic solvents. The synthesized PU sponge has great potential for practical applications due to its facile fabrication and excellent oil–water separation properties. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Nanocomposites and Functional Coatings for Water Purification)
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15 pages, 2692 KiB  
Article
Sulfonated Pentablock Copolymer with Graphene Oxide for Co2+ Ions Removal: Efficiency, Interaction Mechanisms and Secondary Reaction Products
by Simona Filice, Viviana Scuderi, Massimo Zimbone, Sebania Libertino, Luana La Piana, Roberta Agata Farina and Silvia Scalese
Coatings 2023, 13(10), 1715; https://doi.org/10.3390/coatings13101715 - 29 Sep 2023
Cited by 2 | Viewed by 1109
Abstract
In this work, sulfonated pentablock copolymer (s-PBC) and s-PBC mixed with graphene oxide (s-PBC_GO) layers were deposited on polypropylene (PP) fibrous filters and tested as active coatings for the removal of cobalt ions from water using adsorption and filtration processes. Some of the [...] Read more.
In this work, sulfonated pentablock copolymer (s-PBC) and s-PBC mixed with graphene oxide (s-PBC_GO) layers were deposited on polypropylene (PP) fibrous filters and tested as active coatings for the removal of cobalt ions from water using adsorption and filtration processes. Some of the coated filters were treated by UV light irradiation to modify their hydrophilic properties. The filters were characterized, before and after the processes, by energy-dispersive X-ray (EDX) analysis and Fourier transform infrared spectroscopy (FT-IR). The Qt (mg/g) values, defined as the weight ratio between the removed ions and the coating layer, were evaluated. In the case of adsorption processes, the best results for the removal of Co2+ ions were achieved by the s-PBC_GO coating, with a Qt of 37 mg/g compared to 21 mg/g obtained by the s-PBC. This was ascribed to the presence of GO, which contains more favorable sites able to adsorb positive ions from the solution. Vice versa, for filtration processes, the s-PBC coated filters show similar or slightly better results than the s-PBC_GO coated ones. Such differences can be ascribed to the shorter contact time between the solution and the coating layer in the case of filtration, with respect to adsorption processes, thus reducing the chance for the ions to be adsorbed on the GO layers before passing through the filter. A collateral effect, observed in this study and enhanced in the case of UV-treated coatings, is the release of radical oxysulfur species. The mechanisms involved in this effect are discussed and identified as a consequence of the interaction between the coating layers and metal ions. In order to identify the mechanism of oxysulfur radicals formation and considering a water sample closer to real water, the Co2+ ions adsorption experiments were conducted in the presence of a competitive organic contaminant (i.e., methyl orange, MO). Full article
(This article belongs to the Special Issue Synthesis and Characterization of Nanocomposites and Functional Coatings for Water Purification)
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12 pages, 8406 KiB  
Article
A New Coated Proppant for Packing Fractures in Oil Reservoirs
by Haidong Wang, Haodong Kang, Jiaxin Liu, Fei Wang, Chunyao Wang, Fengyuan Yang and Yunfeng Zhang
Coatings 2023, 13(7), 1238; https://doi.org/10.3390/coatings13071238 - 11 Jul 2023
Cited by 3 | Viewed by 1472
Abstract
The method of packing conventional proppant into fractures is used to maintain high liquid permeability. In this study, by coating a hydrophobic material on the surface of a proppant, the layer packed with this coated proppant was endowed with water-plugging and oil-permeability capacities. [...] Read more.
The method of packing conventional proppant into fractures is used to maintain high liquid permeability. In this study, by coating a hydrophobic material on the surface of a proppant, the layer packed with this coated proppant was endowed with water-plugging and oil-permeability capacities. Moreover, several research experiments were carried out to verify the proposed method: a water plugging capacity (WPC) test of the coated proppant layer, compression and temperature resistance tests of the coated proppant (temperature range from 90 to 210 °C; pressure range from 5.9 to 91.4 MPa), and a 3D test of the oil recovery enhancement. The results show that the proppant coating has good compression resistance, and the proppant begins to break at 27.3 MPa. The upper limit of the temperature resistance of the coating is 170 °C. The WPC of the layer packed with coated proppant was still reliable during fracture, which was enhanced by at least 20% compared with that of the layer packed with a conventional proppant. The fracture packed with the coated proppant had superior working performance compared with that packed with a conventional proppant. It can reduce the flow capacity of the water phase breaking into the dominant flow passage so as to delay the rise in the water production of the oil well and prolong the duration of oil production. In this way, oil recovery could be increased by about 7.7%. In conclusion, the technology proposed in this paper has particular water-plugging and oil-permeating characteristics, with remarkable technical advantages, thus providing a new idea for the development of water control in fracture reservoirs. Full article
(This article belongs to the Special Issue Synthesis and Characterization of Nanocomposites and Functional Coatings for Water Purification)
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