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Separations
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Nanomaterials in Green Analytical Chemistry
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Special Issue "Nanomaterials in Green Analytical Chemistry"

A special issue of Separations (ISSN 2297-8739).

Deadline for manuscript submissions: 30 September 2021.

Special Issue Editors

Prof. Dr. George Zachariadis
E-Mail Website
SciProfiles
Guest Editor
Department of Chemistry, Aristotle University, Thessaloniki 54124, Greece
Interests: hyphenated techniques and mass spectrometry; atomic spectrometry techniques; speciation analysis; sample pretreatment techniques; chemometrics
Special Issues and Collections in MDPI journals
Dr. Rosa Peñalver
E-Mail Website
SciProfiles
Guest Editor
Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, E-30100 Murcia, Spain
Interests: microplastics; pollutants; recycling; environment; food; chromatography; mass spectrometry; thermal analysis

Special Issue Information

Dear Colleagues,

Sample preparation and pretreatment procedures increasingly demand the use of powerful and, if possible, universal materials for extraction, microextraction, purification, fractionation, and other separations procedures. In biological, food, environmental, and many other types of samples, the sample preparation step, besides being crucial for the overall performance of the analysis, remains critical, also because of the production of several wastes. Therefore, the employment of environmentally friendly and low-quantity materials has become popular in numerous analytical methods aiming to target analytes, including metals, biomolecules, metabolites, and organic pollutants. Nanomaterials can further assist the development of green analytical chemistry in this sense.

For this Special Issue, we invite submissions of original research articles or reviews reporting on the current advances in analytical method development and applications of nanomaterials of all types, including graphene, carbon nanotubes, ceramic, metallic materials, metal organic frameworks, magnetic nanostructures, and other nanocomposites, in sample preparation and in all kinds of separation techniques.

Prof. Dr. George Zachariadis
Dr. Rosa Peñalver
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 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. Separations 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 1800 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

  • green analytical methods
  • nanomaterials
  • nanotubes
  • graphene
  • metal organic frameworks
  • sample treatment
  • microextraction
  • preconcentration
  • magnetic
  • dispersive
  • solid phase

Published Papers (4 papers)

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Research

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Article
Automated Solid Phase Extraction of Cd(II), Co(II), Cu(II) and Pb(II) Coupled with Flame Atomic Absorption Spectrometry Utilizing a New Sol-Gel Functionalized Silica Sorbent
by
Natalia Manousi
,
Abuzar Kabir
,
Kenneth G. Furton
,
George A. Zachariadis
and
Aristidis Anthemidis
Separations 2021, 8(7), 100; https://doi.org/10.3390/separations8070100 - 08 Jul 2021
Cited by 1 | Viewed by 570
Abstract
In this study a simple and sensitive on-line sorbent extraction platform coupled with flame atomic absorption spectrometry for trace metals determination was developed. The system utilized for the first time a novel sol-gel thiocyanatopropyl functionalized silica as adsorbent for metal’s separation and preconcentration. [...] Read more.
In this study a simple and sensitive on-line sorbent extraction platform coupled with flame atomic absorption spectrometry for trace metals determination was developed. The system utilized for the first time a novel sol-gel thiocyanatopropyl functionalized silica as adsorbent for metal’s separation and preconcentration. The main factors affecting the performance of the on-line system were investigated and optimized. The effect of potential interfering species that occur naturally in environmental and biological samples, as well as some toxic elements, was evaluated. Under optimum conditions the enhancement factors ranged between 73 and 152 for the target analytes. The LODs of the proposed methods were 0.15 μg L−1 for Cd(II), 0.5 μg L−1 for Co(II), 0.5 μg L−1 for Cu(II) and 1.9 μg L−1 for Pb(II) for 120 s preconcentration time. The relative standard deviation values for all elements were less than 3.8%, indicating good method precision. Moreover, the sol-gel thiocyanatopropyl functionalized silica-packed microcolumns exhibited limited flow resistance and excellent packing reproducibility. Finally, the proposed method was utilized for the analysis of environmental and biological samples. Full article
(This article belongs to the Special Issue Nanomaterials in Green Analytical Chemistry)
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Article
Monitoring of Remaining Thiophenic Compounds in Liquid Fuel Desulphurization Studies Using a Fast HPLC-UV Method
by
Vasiliki Kapsali
,
Konstantinos Triantafyllidis
,
Eleni Deliyanni
and
Victoria Samanidou
Separations 2021, 8(4), 48; https://doi.org/10.3390/separations8040048 - 11 Apr 2021
Viewed by 688
Abstract
Thiophenic compounds constitute a class of sulfur compounds derived by thiophene, containing at least one thiophenic ring. Their presence in fuels (crude oil, etc.) is important and can reach 3% m/m. The combustion of fuels leads to the formation of sulfur oxides a [...] Read more.
Thiophenic compounds constitute a class of sulfur compounds derived by thiophene, containing at least one thiophenic ring. Their presence in fuels (crude oil, etc.) is important and can reach 3% m/m. The combustion of fuels leads to the formation of sulfur oxides a severe source of environmental pollution issues, such as acid rain with adverse effects both to humans and to the environment. To reduce such problems, the EU and other regulatory agencies worldwide set increasingly stringent regulations for sulfur content in fuels resulting in the necessity for intense desulphurization processes. However, most of these processes are inefficient in the total removal of sulfur compounds. Therefore, thiophenic compounds such as benzothiophenes and dibenzothiophenes are still present in heavier fractions of petroleum, therefore, their determination is of great importance. Until now, all HPLC methods applied in similar studies use gradient elution programs that may last more than 25 min with no validation results provided. To fill this gap, the aim of the present study was to develop and validate a simple and fast HPLC-UV method in order to be used as a useful monitoring tool in the evaluation studies of novel desulfurization technologies by means of simultaneous determination of dibenzothiophene (DBT) and 4,6-dimethyl-dibenzothiophene and dibenzothiophene sulfone in the desulfurization effluents. Full article
(This article belongs to the Special Issue Nanomaterials in Green Analytical Chemistry)
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Article
Statistical Models of the Distribution of Chemical Elements in Precambrian Rocks of the Siberian Craton
by
Alexander Kravchenko
,
Boris Gerasimov
,
Evgeniy Loskutov
,
Alexander Okrugin
,
Larisa Galenchikova
and
Vasily Beryozkin
Separations 2021, 8(3), 23; https://doi.org/10.3390/separations8030023 - 25 Feb 2021
Viewed by 521
Abstract
Natural chemical systems are an excellent object for studying the properties of various elements. The most diverse and informative geological complexes are crystalline rocks of the Precambrian. These rocks are exposed near the northern and southern margins of the Siberian craton. The chemical [...] Read more.
Natural chemical systems are an excellent object for studying the properties of various elements. The most diverse and informative geological complexes are crystalline rocks of the Precambrian. These rocks are exposed near the northern and southern margins of the Siberian craton. The chemical composition of rocks, the contents of impurity elements, and metals were studied by us using chemical and spectral analysis methods. Microprobe studies were performed. Using regression and multivariate statistical methods of analysis, the regularities of the distribution of chemical elements were found. It is shown that the distribution of precious metals and carbon dioxide in rocks is attributed to their chemical properties and comparable with close in-chemical properties’ rock-forming elements. It is found that the factor analysis reflects the uniform regularities of the distribution of elements in different regions and rocks. These regularities are similar on macro and micro levels. Comparison of the distribution patterns with the results of geochemical and petrological studies of other authors shows the leading role of the redox potential and acidity of the environment in the formation of rocks and minerals. The role of mathematical statistics for solving problems of chemical petrology and chemical systems analysis is underlined. Full article
(This article belongs to the Special Issue Nanomaterials in Green Analytical Chemistry)
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Review

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Review
Metal-Organic Frameworks in Bioanalysis: Extraction of Small Organic Molecules
by
Natalia Manousi
,
Orfeas-Evangelos Plastiras
,
Natasa P. Kalogiouri
,
Constantinos K. Zacharis
and
George A. Zachariadis
Separations 2021, 8(5), 60; https://doi.org/10.3390/separations8050060 - 04 May 2021
Cited by 1 | Viewed by 682
Abstract
The quantitative determination of xenobiotic compounds, as well as biotics in biological matrices, is generally described with the term bioanalysis. Due to the complexity of biofluids, in combination with the low concentration of the small molecules, their determination in biological matrices is a [...] Read more.
The quantitative determination of xenobiotic compounds, as well as biotics in biological matrices, is generally described with the term bioanalysis. Due to the complexity of biofluids, in combination with the low concentration of the small molecules, their determination in biological matrices is a challenging procedure. Apart from the conventional solid-phase extraction, liquid-liquid extraction, protein precipitation, and direct injection approaches, nowadays, a plethora of microextraction and miniaturized extraction techniques have been reported. Furthermore, the development and evaluation of novel extraction adsorbents for sample preparation has become a popular research field. Metal-organic frameworks (MOFs) are novel materials composed of metal ions or clusters in coordination with organic linkers. Unequivocally, MOFs are gaining more and more attention in analytical chemistry due to their superior properties, including high surface area and tunability of pore size and functionality. This review discusses the utilization of MOFs in the sample preparation of biological samples for the green extraction of small organic molecules. Their common preparation and characterization strategies are discussed, while emphasis is given to their applications for green sample preparation. Full article
(This article belongs to the Special Issue Nanomaterials in Green Analytical Chemistry)
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