Special Issue "Sustainable Remediation Processes Based on Zeolites"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Green Processes".

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editor

Dr. Claudia Belviso
Website
Guest Editor
CNR-IMAA, Italy
Interests: zeolite synthesis from wastes and natural sources; processes for the remediation of polluted soils and water; X-ray diffraction methodologies for mineralogical analysis; clay minerals

Special Issue Information

Dear Colleagues,

Zeolites are crystalline hydrated aluminosilicates characterised by a three-dimensional network of tetrahedral (Si,Al)O4 units that form a system of interconnected pores, which makes these minerals very useful in many applications. Natural and synthetic zeolites can be used for mine water remediation and the treatment of acid mine drainage as well as the removal of ammonium from contaminated solutions and heavy metals from polluted water. Several remediation technologies based on zeolites have also been developed in order to clean up contaminated soils. Some techniques lean towards heavy metal immobilization through the addition of these reactive minerals that alter solid-phase partitioning of the metal contaminant, thus reducing their bioavailability.

This Special Issue on “Sustainable Remediation Processes Based on Zeolites” invites research or review papers focused on the development or application of natural and synthetic zeolites for soil and water remediation. It aims to collect manuscripts describing up-to-date advances in remediation processes based on these very useful minerals as well as to show recent experimental works within this area.

Dr. Claudia Belviso
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. Processes 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 1500 CHF (Swiss Francs). Please note that for papers submitted after 31 December 2020 an APC of 2000 CHF applies. 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

  • natural and synthetic zeolite
  • environmental risk assessment
  • water and soil remediation
  • organic and inorganic pollution

Published Papers (3 papers)

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Research

Open AccessArticle
Studies on the Potential of Nonmodified and Metal Oxide-Modified Coal Fly Ash Zeolites For Adsorption of Heavy Metals and Catalytic Degradation of Organics for Waste Water Recovery
Processes 2020, 8(7), 778; https://doi.org/10.3390/pr8070778 - 03 Jul 2020
Abstract
A nanocrystalline zeolite of Na-X type (CFAZ) was synthesized by ultrasonic-assisted double stage fusion-hydrothermal alkaline conversion of lignite coal fly ash. Modified CFAZ with magnetic nanoparticles (MNP-CFAZ) was obtained by adding presynthesized magnetic nanoparticles between the synthesis stages. CFAZs loaded by particles of [...] Read more.
A nanocrystalline zeolite of Na-X type (CFAZ) was synthesized by ultrasonic-assisted double stage fusion-hydrothermal alkaline conversion of lignite coal fly ash. Modified CFAZ with magnetic nanoparticles (MNP-CFAZ) was obtained by adding presynthesized magnetic nanoparticles between the synthesis stages. CFAZs loaded by particles of copper (Cu-CFAZ) and cobalt (Co-CFAZ) oxides were prepared by postsynthesis modification of the parent CFAZ, applying a wet impregnation technique. The parent and modified CFAZs were examined for their phase composition by X-ray diffraction, morphology by scanning electron microscopy, and surface characteristics by N2 physisorption. Comparative studies have been carried out on the adsorption capacity of the starting CFAZ and its derivatives with respect to Cd2+- and Pb2+-ions from aqueous solutions. Adsorption isotherms of Cd2+-ions on the studied samples were plotted and described by the adsorption equations of Langmuir, Freundlich, Langmuir–Freundlich, and Temkin. The best correlation between the experimental and model isotherms for the parent and modified CFAZ was found with the Langmuir linear model, assuming a monolayer adsorption mechanism. Parent and modified CFAZs were also studied as catalysts for heterogeneous thermal Fenton oxidation of methylene blue. At 90 °C, the higher catalytic activity exhibits the nonmodified sample, but with the decrease in temperature to 60 °C, the modified samples are more effective catalysts. Full article
(This article belongs to the Special Issue Sustainable Remediation Processes Based on Zeolites)
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Open AccessArticle
A Fractal-Based Correlation for Time-Dependent Surface Diffusivity in Porous Adsorbents
Processes 2020, 8(6), 689; https://doi.org/10.3390/pr8060689 - 12 Jun 2020
Abstract
Fluid–solid adsorption processes are mostly governed by the adsorbate transport in the solid phase and surface diffusion is often the limiting step of the overall process in microporous materials such as zeolites. This work starts from a concise review of concepts and models [...] Read more.
Fluid–solid adsorption processes are mostly governed by the adsorbate transport in the solid phase and surface diffusion is often the limiting step of the overall process in microporous materials such as zeolites. This work starts from a concise review of concepts and models for surface transport and variable surface diffusivity. It emerges that the phenomenon of hindered surface diffusion for monolayer adsorption, which is common in zeolites, and models able to fit a non-monotonic trend of surface diffusivity against adsorbate solid phase concentration, have received limited attention. This work contributes to the literature of hindered diffusion by formulating a time-dependent equation for surface diffusivity based on fractal dynamics concepts. The proposed equation takes into account the contributions of both fractal-like diffusion (a time-decreasing term) and hopping diffusion (a time-increasing term). The equation is discussed and numerically analyzed to testify its ability to reproduce the possible different patterns of surface diffusivity vs. time. Full article
(This article belongs to the Special Issue Sustainable Remediation Processes Based on Zeolites)
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Open AccessFeature PaperArticle
Catalytic Oxidation of Methylene Blue by Use of Natural Zeolite-Based Silver and Magnetite Nanocomposites
Processes 2020, 8(4), 471; https://doi.org/10.3390/pr8040471 - 16 Apr 2020
Cited by 1
Abstract
This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, [...] Read more.
This work reports the synthesis of natural zeolite-based silver and magnetite nanocomposites and their application for the catalytic oxidation of methylene blue in water. The zeolite was impregnated with 5.5 wt.% Fe in the form of magnetite nanoparticles with size of 32 nm, and with 6.4 wt.% Ag in the form of silver oxide and metallic silver nanoparticles with sizes of 42 and 20 nm, respectively. The results showed that physical adsorption contributed to the removal of methylene blue by 25–36% and that Fe3O4@NZU is superior to Ag2[email protected] and Ag0@NZU, leading to 55% removal without oxidant and 97% in the presence of H2O2. However, there is no evidence of significant mineralization of methylene blue. The application of reaction rate models showed that the reaction order changes from zero to first and second order depending on the H2O2 concentration. Full article
(This article belongs to the Special Issue Sustainable Remediation Processes Based on Zeolites)
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