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Nanomaterials
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Nano Geochemistry: Risk Assessment and Green Environmental Applications
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Nano Geochemistry: Risk Assessment and Green Environmental Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Environmental Nanoscience and Nanotechnology".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 6071

Special Issue Editors

Prof. Dr. Thorsten Schäfer

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Guest Editor
Friedrich Schiller University Jena, Institute of Geosciences, Applied Geology, 07749 Jena, Germany
Interests: geochemistry; environmental science; colloid and interface science; hydrogeology; radiochemistry
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Woojin Lee

E-Mail Website
Guest Editor
Civil and Environmental Engineering, Nazarbayev University, Nur-Sultan 010000, Kazakhstan
Interests: environmental catalysis; nanomaterials for environmental and energy applications; carbon utilization and sequestration; sustainable water and wastewater treatments
Special Issues, Collections and Topics in MDPI journals
Dr. Gopala Krishna Darbha

E-Mail Website
Guest Editor
Indian Institute of Science Education and Research Kolkata, Mohanpur, India
Interests: applied environmental chemistry; colloid and interface science; hydrogeochemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The geophysical and chemical dynamics at the solid–water interface ultimately control the transport properties of geomaterials via dissolution/precipitation reactions and are of paramount importance for the fate of organic and inorganic contaminants in such systems. Understanding the mechanistic process used on the nanoscale is a prerequisite for the reliable prediction of the long-term behavior of chemical compounds in the natural and anthropogenic-influenced environment. We encourage papers on research in the interdisciplinary field of earth and material science with the additional aspect of biogeochemical processes. Nucleation and nanoparticle formation are the key aspects of the strategic formation of metal ores, biogeochemical cycling, and industrial processes, such as early cement hydration and advanced remediation strategies. Contributions on theoretical approaches, including molecular dynamic simulations and geochemical/surface complexation modeling, are also encouraged.

Prof. Dr. Thorsten Schäfer
Prof. Dr. Woojin Lee
Dr. Gopala Krishna Darbha
Guest Editors

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. Nanomaterials 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 2900 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

  • nanoparticles
  • environmental nanocatalysts
  • colloids
  • microbes
  • engineered NP
  • redox zones
  • remediation
  • environmental nanomaterials
  • risk assessment

Published Papers (4 papers)

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Editorial

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4 pages, 192 KiB  
Editorial
Nano Geochemistry
by Thorsten Schäfer, Woojin Lee and Gopala Krishna Darbha
Nanomaterials 2022, 12(7), 1039; https://doi.org/10.3390/nano12071039 - 22 Mar 2022
Viewed by 1441
Abstract
It is our great pleasure to briefly introduce our motivation to collect scientific contributions for this Special Issue, entitled “Nano Geochemistry” [...] Full article
(This article belongs to the Special Issue Nano Geochemistry: Risk Assessment and Green Environmental Applications)

Research

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10 pages, 23224 KiB  
Article
Biofilm Degradation by Seashell-Derived Calcium Hydroxide and Hydrogen Peroxide
by Yuuki Hata, Yuta Bouda, Sumiyo Hiruma, Hiromi Miyazaki and Shingo Nakamura
Nanomaterials 2022, 12(20), 3681; https://doi.org/10.3390/nano12203681 - 20 Oct 2022
Cited by 4 | Viewed by 1630
Abstract
Microbial cells and self-produced extracellular polymeric substances assembled to form biofilms that are difficult to remove from surfaces, causing problems in various fields. Seashell-derived calcium hydroxide, a sustainable inorganic material, has shown high bactericidal activity even for biofilms due to its alkalinity. However, [...] Read more.
Microbial cells and self-produced extracellular polymeric substances assembled to form biofilms that are difficult to remove from surfaces, causing problems in various fields. Seashell-derived calcium hydroxide, a sustainable inorganic material, has shown high bactericidal activity even for biofilms due to its alkalinity. However, its biofilm removal efficacy is relatively low. Herein, we report a biofilm degradation strategy that includes two environmentally friendly reagents: seashell-derived calcium hydroxide and hydrogen peroxide. A biofilm model of Escherichia coli was prepared in vitro, treated with calcium hydroxide–hydrogen peroxide solutions, and semi-quantified by the crystal violet stain method. The treatment significantly improved biofilm removal efficacy compared with treatments by calcium hydroxide alone and hydrogen peroxide alone. The mechanism was elucidated from calcium hydroxide–hydrogen peroxide solutions, which suggested that perhydroxyl anion and hydroxyl radical generated from hydrogen peroxide, as well as the alkalinity of calcium hydroxide, enhanced biofilm degradation. This study showed that concurrent use of other reagents, such as hydrogen peroxide, is a promising strategy for improving the biofilm degradation activity of seashell-derived calcium hydroxide and will contribute to developing efficient biofilm removal methods. Full article
(This article belongs to the Special Issue Nano Geochemistry: Risk Assessment and Green Environmental Applications)
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15 pages, 3721 KiB  
Article
L-Tryptophan Aqueous Systems at Low Concentrations: Interconnection between Self-Organization, Fluorescent and Physicochemical Properties, and Action on Hydrobionts
by Irina S. Ryzhkina, Lyaisan I. Murtazina, Larisa A. Kostina, Diana A. Sharapova, Irina S. Dokuchaeva, Svetlana Yu. Sergeeva, Kristina A. Meleshenko and Andrew M. Petrov
Nanomaterials 2022, 12(11), 1792; https://doi.org/10.3390/nano12111792 - 24 May 2022
Cited by 5 | Viewed by 1349
Abstract
As shown by fluorescence monitoring of dissolved organic matter, amino acid L-Trp can be present in natural water. The consequences of the presence of L-Trp at low concentrations in surface water systems are not yet established for hydrobionts. Studying the physicochemical [...] Read more.
As shown by fluorescence monitoring of dissolved organic matter, amino acid L-Trp can be present in natural water. The consequences of the presence of L-Trp at low concentrations in surface water systems are not yet established for hydrobionts. Studying the physicochemical patterns, as well as their relationships to the bioeffects of L-Trp solutions in the low concentration range, can provide new and important information regarding the unknown effects of L-Trp. The self-organization, physicochemical properties, fluorescence, UV absorption, and action of L-Trp solutions on Paramecium caudatum infusoria, Chlorella vulgaris algae were studied in the calculated concentrations range of 1 × 10−20–1 × 10−2 mol/L. The relationship between these phenomena was established using the certified procedures for monitoring the toxicity of natural water and wastewater. It was shown for the first time that aqueous solutions of L-Trp are dispersed systems in which the dispersed phase (nanoassociates) undergoes a rearrangement with dilution, accompanied by coherent changes in the nanoassociates’ parameters and the properties of systems. The non-monotonic concentration dependence of fluorescence intensity (λex at 225 nm, λem at 340 nm) is in good agreement with the data on the nanoassociates’ parameters, as well as with both the physicochemical properties of the systems and their bioassay results. Full article
(This article belongs to the Special Issue Nano Geochemistry: Risk Assessment and Green Environmental Applications)
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Other

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8 pages, 265 KiB  
Perspective
The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts
by Nurbek Nurlan, Ainash Akmanova and Woojin Lee
Nanomaterials 2022, 12(7), 1212; https://doi.org/10.3390/nano12071212 - 04 Apr 2022
Cited by 2 | Viewed by 1443
Abstract
The formation of bromate (BrO3−)in groundwater treatment is still a severe environmental problem. Catalytic hydrogenation by nanoscale heterogeneous catalysts with gaseous H2 or solid-state H2 has emerged as a promising approach, which relies on reducing BrO3− [...] Read more.
The formation of bromate (BrO3−)in groundwater treatment is still a severe environmental problem. Catalytic hydrogenation by nanoscale heterogeneous catalysts with gaseous H2 or solid-state H2 has emerged as a promising approach, which relies on reducing BrO3− to innocuous Br− via the process of direct electron transfer or reduction with atomic hydrogen. Several nanocatalysts have demonstrated high efficiency with a 100% effective BrO3− reduction with greater than 95% of Br− generation in the batch and continuous reactors. However, this technology has not been widely adopted in water treatment systems. Indeed, this research article summarizes the advantages and disadvantages of these technologies by highlighting the factors of nanomaterials reduction efficiency, long-term durability, and stability, as well as addressing the essential challenges limiting the implementation of the use of H2 for BrO3− reduction. In this work, we provide an economic evaluation of catalytic BrO3− removal, safe hydrogen supply, storage, and transportation. Full article
(This article belongs to the Special Issue Nano Geochemistry: Risk Assessment and Green Environmental Applications)
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