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Separations
Special Issues
Development of Materials for Separation and Analysis Applications
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Development of Materials for Separation and Analysis Applications

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Materials in Separation Science".

Deadline for manuscript submissions: 15 May 2025 | Viewed by 2252

Special Issue Editor

Dr. Israel S. Ibarra

E-Mail Website
Guest Editor
Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Hidalgo, Mexico
Interests: analytical chemistry; material chemistry; separation science; removal chemical; emergent and persistent contaminants; chemometrics

Special Issue Information

Dear Colleagues,

The Special Issue “Development of Materials for Separation and Analysis Applications” includes original research papers and critical reviews that conceptualize the development of new materials through the modification of natural and synthetic materials, synthesis methods, or functionalization processes in separation science.

Materials with a high selectivity degree are applied in the development of techniques for extraction, separation, preconcentration, and removal. These techniques include systems such as solid-phase extraction (SPE), dispersive solid-phase extraction (DSPE), magnetic solid-phase extraction (MSPE), solid-phase microextraction (SPME), and others. In addition, their integration into detection methods such as Chromatography, Electrophoresis, Spectrophotometry, Electrochemistry, etc., allows the development of precise and selective analytical systems.

The structural characterization of each material should be described based on its physicochemical properties and the methods used, such as SEM, EDS, SEM-EDX, TEM, BET, XDR, TGA, FTIR, etc. Research on each material should focus on analyzing contaminants of environmental and public health interest, including aromatic compounds, polycyclic compounds, volatile environmental organic compounds, food additives, pharmaceuticals, pesticides, and metal ions, among others. 

Dr. Israel S. Ibarra
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. 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 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

  • material chemistry
  • separation science
  • polymers
  • analytical techniques
  • sample treatment
  • food and environmental samples

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

Published Papers (3 papers)

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Research

14 pages, 2303 KiB  
Article
The Development and Evaluation of Biosorbent Composite Spheres for the Adsorption and Quantification of Copper
by Irma Pérez-Silva, María Elena Páez-Hernández, Francisco Javier Martínez-Flores, Jesús Andrés Tavizón-Pozos and Giaan Arturo Álvarez Romero
Separations 2024, 11(11), 307; https://doi.org/10.3390/separations11110307 - 26 Oct 2024
Viewed by 466
Abstract
Separation techniques are employed to treat and preconcentrate samples. Preconcentration commonly employs adsorption due to the wide range of sorbents available. The biosorbent composite has emerged as a highly effective alternative, primarily due to its selectivity for active sites and its impressive adsorption [...] Read more.
Separation techniques are employed to treat and preconcentrate samples. Preconcentration commonly employs adsorption due to the wide range of sorbents available. The biosorbent composite has emerged as a highly effective alternative, primarily due to its selectivity for active sites and its impressive adsorption capability. This study aimed to assess and create a spherical biosorbent composite using cellulose acetate and avocado seed. The purpose of this work was to use a biosorbent composite for copper adsorption by flame atomic absorption spectrometry. The copper adsorption follows the Langmuir isotherm, which indicates that it occurs in a monolayer and is homogeneous. Additionally, the adsorption nature is favorable according to the RL factor. The highest capacity for copper adsorption is 0.121 mg g−1. The report describes the methodology and validation process for quantifying copper. The findings demonstrate that the composite biosorbent enables accurate preconcentration and quantification of copper found in decongestants. Full article
(This article belongs to the Special Issue Development of Materials for Separation and Analysis Applications)
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14 pages, 3400 KiB  
Article
Design of Selective Nanoparticles of Layered Double Hydroxide (Mg/Al-LDH) for the Analysis of Anti-Inflammatory Non-Steroidal Agents in Environmental Samples, Coupled with Solid-Phase Extraction and Capillary Electrophoresis
by David Aurelio-Soria, Xochitl H. Canales, Isai Vázquez-Garrido, Gabriela Islas, Giaan A. Álvarez-Romero and Israel S. Ibarra
Separations 2024, 11(9), 259; https://doi.org/10.3390/separations11090259 - 1 Sep 2024
Viewed by 665
Abstract
A simple, fast, and low-cost pre-concentration methodology based on the application of solid-phase extraction coupled to layered double hydroxides (LDHs) and capillary electrophoresis was developed for the determination of naproxen (NPX), diclofenac (DFC), and ibuprofen (IBP) in environmental sample waters. A systematic study [...] Read more.
A simple, fast, and low-cost pre-concentration methodology based on the application of solid-phase extraction coupled to layered double hydroxides (LDHs) and capillary electrophoresis was developed for the determination of naproxen (NPX), diclofenac (DFC), and ibuprofen (IBP) in environmental sample waters. A systematic study of the LDH composition was designed, including the effects of interlayer anions (NO3−, Cl−, CO32−, BenO−, and SDS−) and the effect of molar ratio (Mg:Al). The optimal composition of MgAl/Cl−-LDH (Mg:Al; 1.5:1.0) was coupled to an SPE system: pH (neutral pH), LDH amount (15 mg), and extraction capacity ranged from 79.71 to 83.11% for the three anti-inflammatory non-steroidal agents analyzed. A recovery rate of up to 80.87% was obtained when 0.01 M chloride acid in methanol was used as the eluent and 50 mL of sample was used. Under optimal conditions, the linear range of the calibration curve ranges from 18.02 to 200 μg L−1, with limits of detection ranging from 6.03 to 18.02 μg L−1 for the three NSAIDs. The precision of the methodology was evaluated in terms of inter- and intra-day repeatability, with %RSD < 10% in all cases. The proposed method was applied to analyze environmental water samples (bottle, tap, cistern, well, and river water samples). The developed method is a robust technique capable of combining with other analytical methods to quantitatively determine anti-inflammatory non-steroidal agents. Full article
(This article belongs to the Special Issue Development of Materials for Separation and Analysis Applications)
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14 pages, 5092 KiB  
Article
Development of a Voltammetric Methodology Based on a Methacrylic Molecularly Imprinted Polymer-Modified Carbon-Paste Electrode for the Determination of Aflatoxin B1
by Fabiola Hernández-García, Jesús Antonio Cruz-Navarro, Jesús García-Serrano, Miriam Franco-Guzmán, Gabriela Islas and Giaan A. Alvarez-Romero
Separations 2024, 11(8), 246; https://doi.org/10.3390/separations11080246 - 12 Aug 2024
Viewed by 750
Abstract
Aflatoxin B1 (AFB1) is one of the most dangerous mycotoxins found in food, necessitating the development of precise and reliable methodologies for its detection. In this study, a novel electrochemical sensor based on a molecularly imprinted polymer (MIP) integrated with a [...] Read more.
Aflatoxin B1 (AFB1) is one of the most dangerous mycotoxins found in food, necessitating the development of precise and reliable methodologies for its detection. In this study, a novel electrochemical sensor based on a molecularly imprinted polymer (MIP) integrated with a carbon-paste electrode was developed for the voltammetric determination of AFB1. The innovative aspect of this work lies in the use of methacrylic acid (MAA) as the functional monomer, which enhances the sensor’s selectivity and binding affinity. The developed electrochemical sensor exhibited a linear response range from 20.8 to 80 ng/L, with a limit of detection (LOD) of 2.31 ng/L and a sensitivity of 19.83 µA (ng/L)−1 cm−2. The sensor demonstrated outstanding analytical performance, with reproducibility and repeatability yielding relative standard deviations (RSDs) of 3.24% and 1.41%, respectively. To validate the sensor’s practical applicability, its performance was tested in real samples of corn and wheat using the standard addition method. Samples were prepared following official Mexican standard methods. Detected AFB1 concentrations were 0.0147 μg/L and 0.0138 μg/L for corn and wheat, respectively. A statistical comparison using the Student’s t-test confirmed no significant matrix effects, underscoring the high selectivity and accuracy of the MIP-modified sensor. This work introduces a highly selective, sensitive, and reproducible methodology for AFB1 detection, which could significantly advance food safety monitoring. Full article
(This article belongs to the Special Issue Development of Materials for Separation and Analysis Applications)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Study of Cu(II), Ni(II), and Pb(II) removal from industrial wastewater, by adsorption with a natural clinoptilolite-mordenite type zeolite
Authors: Angel A. Alvarado Nuño1, José Luis Contreras1*, Hugo Solis C1., Beatriz Zeifert2, José Salmones3, Ricardo López M1, Leticia Nuño L.1, Saul Angel Cuevas1
Affiliation: 1. Chemical Industry Process Area, Energy Department CBI, Universidad Autonoma Metropolitana, Azcapotzalco. Mexico, City, México 2. Department of Metallurgy, ESIQIE-Instituto Politécnico Nacional, México 3. Graduate Section, ESIQIE- Instituto Politécnico Nacional, México
Abstract: The adsorption capacity of a natural zeolite composed mainly of clinoptilolite-mordenite was studied for the removal of Cu(II), Ni(II), and Pb(II) cations contained in a typical industrial wastewater. Adsorption isotherms of the three metals were performed separately and together, as well as with the resulting pairs of the three metals. For the adsorption of the individual metals, an adsorption of 272 mg of Pb(II)/gzeolite, 13.7 mg of Ni(II)/ gzeolite and 21.4 mg of Cu(II)/ gzeolite was found. For the case of the three combined metals, the adsorption experiments were carried out by varying the amount of zeolite and a maximum of 44.2 mg of Pb(II)/ gzeolite, 8.2 mg of Cu(II)/gzeolite, and 1.04 mg of Ni(II)/ gzeolite were found. Regarding the adsorption equilibrium, in all cases, practically the total adsorption of the metals under study was carried out in the first 20 minutes of contact time. The characterization of the zeolites was made by, XRD, N2 physisorption, (BET area), and SEM-EDS. No significant differences were found in the adsorption efficiency of the metal cations when ion exchange was carried out on the zeolite under study. The results obtained were used to calculate the adsorption constant of the Langmuir equation for each metal separately. For Cu(II), the constant was 0.725 L/mg, for Ni(II) it was 0.423 L/mg, and for Pb(II) it was 0.756 L/mg. It was observed that the order of adsorption in the affinity of the metallic cation to the active site in the studied zeolite was Pb > Cu > Ni. This effect was much more marked in the case of the metallic cations alone than in competition with the others.

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