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Separations
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Development of New Adsorbent Materials and Understanding Adsorption Mechanisms
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Development of New Adsorbent Materials and Understanding Adsorption Mechanisms

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

Deadline for manuscript submissions: closed (20 September 2022) | Viewed by 11490

Special Issue Editor

Dr. Yehya Elsayed

E-Mail Website
Guest Editor
Chair-Elect for the ACS Chapter, Department of Biology, Chemistry & Environmental Sciences ((BCE), American University of Sharjah, Sharjah P.O. Box 26666, United Arab Emirates
Interests: chemical characterization and health assessment of Arabian incense and alternative tobacco products such as shisha (waterpipe), e-cigarettes and Medwakh (dokha); development and modifications of activated carbon adsorbents from natural, synthetic and waste materials; air monitoring for GCC airports: sand sampling, characterization and treatment; conversion of waste material into biooil; promoting undergraduate science education and research

Special Issue Information

Dear Colleagues,

Today, we are facing increasing challenges in the field of adsorption due to the growth in the type of pollutants, government regulations to tackle lower concentrations, and application requirements for smaller footprint products. These challenges are accompanied by continuous efforts from the scientific community to develop new adsorbent materials with high efficiency, expanded capacity, and fast kinetics. Moreover, the conversion of solid wastes into innovative composite materials, including adsorbent materials, offers an excellent opportunity for their reuse as well as reduces the demand on raw materials and energy.

This Special Issue of the Separations journal is open to novel articles on the development of new adsorbent materials for various environmental, industrial, and medical applications. The developed materials may cover activated carbons, metallic organic frameworks, carbon organic frameworks, carbonized/activated waste materials, silica gel, and zeolites, among others. Understanding the mechanisms of interaction between adsorbents and adsorbates is critical and would be given high consideration.

We are happy to invite you to submit a manuscript for this Special Issue of Separations. Full research, reviews, and communication articles are all welcomed.

Dr. Yehya Elsayed
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

  • adsorption
  • adsorbate
  • renewable
  • environment
  • waste
  • recyclable
  • mechanisms

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Published Papers (3 papers)

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16 pages, 3417 KiB  
Article
Nanoporosity and Isosteric Enthalpy of Adsorption of CH4, H2, and CO2 on Natural Chabazite and Exchanged
by Miguel Ángel Hernández, Karla Quiroz-Estrada, Gabriela I. Hernandez-Salgado, Roberto Ignacio Portillo, Juana Deisy Santamaría-Juárez, Ma de los Ángeles Velasco, Efraín Rubio and Vitalii Petranovskii
Separations 2022, 9(6), 150; https://doi.org/10.3390/separations9060150 - 10 Jun 2022
Viewed by 2279
Abstract
This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO2, CH4, and H2 on pores in natural chabazite exchanged with aqueous solutions of Na+, Mg2+, and [...] Read more.
This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO2, CH4, and H2 on pores in natural chabazite exchanged with aqueous solutions of Na+, Mg2+, and Ca2+ salts at different concentrations, and with variable time and temperature of treatment. Experimental data of CO2, CH4, and H2 adsorption were treated by the Freundlich and Langmuir equations. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric enthalpy of adsorption. The exchange with Mg2+ and Na+ favors an increase in the adsorption capacity for CO2. while that of Ca2+ and Mg2+ favor adsorption through to H2 and CH4. These cations occupy sites in strategic positions S4 and S4’, which are located in the channels and nanocavities of these zeolites. The presence of Ca2+ and Mg2+ at S4 and S4′ sites causes increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. Depending on the conditions of the exchange treatment, Ca2+ and Mg2+, and Na+ were found to be most favorable, well distributed, and accessible for CO2, CH4, and H2 adsorption. Full article
(This article belongs to the Special Issue Development of New Adsorbent Materials and Understanding Adsorption Mechanisms)
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21 pages, 7599 KiB  
Article
Comparative Study of the Selective Sorption of Organic Dyes on Inorganic Materials—A Cost-Effective Method for Waste Treatment in Educational and Small Research Laboratories
by Anifat Adenike Bankole, Vijo Poulose, Tholkappiyan Ramachandran, Fathalla Hamed and Thies Thiemann
Separations 2022, 9(6), 144; https://doi.org/10.3390/separations9060144 - 7 Jun 2022
Cited by 14 | Viewed by 2582
Abstract
Educational and research laboratories often produce relatively small amounts of highly diverse organic wastes. Treating waste can contribute significantly to the cost of running laboratories. This study introduced a simple and economical waste management system such that readily available used chromatography-grade inorganic materials, [...] Read more.
Educational and research laboratories often produce relatively small amounts of highly diverse organic wastes. Treating waste can contribute significantly to the cost of running laboratories. This study introduced a simple and economical waste management system such that readily available used chromatography-grade inorganic materials, such as silica and alumina (basic and acidic), are utilized to treat remnant dye solutions and solution wastes from educational and small research laboratories. To recycle the adsorbents, they were heated to 600 °C, where the adsorbates were combusted. The results showed that acidic alumina is an effective adsorbent material for azo dyes and anionic dyes/stains, as well as textile dyes, with a 98 to 100% removal efficiency. Furthermore, alumina and silica possess excellent regeneration properties, where the dye removal efficiency of the materials was retained after regeneration at 600 °C. The adsorption properties of the materials were compared with those of aliginite and activated biomass from coffee grounds. Kinetic and thermodynamic studies of the sorption processes on the different materials were carried out. Overall, the inorganic materials used were efficient at removing contaminating remnant organic dyes stemming from educational and small research laboratories. Full article
(This article belongs to the Special Issue Development of New Adsorbent Materials and Understanding Adsorption Mechanisms)
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13 pages, 16581 KiB  
Article
The Adsorption of Corn Stalk Biochar for Pb and Cd: Preparation, Characterization, and Batch Adsorption Study
by Shiwei Yan, Wei Yu, Ting Yang, Qi Li and Jiahua Guo
Separations 2022, 9(2), 22; https://doi.org/10.3390/separations9020022 - 19 Jan 2022
Cited by 45 | Viewed by 5610
Abstract
Biochar adsorption emerges as a convenient and cheap treatment technology to cope with the metal pollution in wastewater. In this study, a biochar made from corn stalks was prepared and its adsorption characteristics for two heavy metals, Pb and Cd, were investigated by [...] Read more.
Biochar adsorption emerges as a convenient and cheap treatment technology to cope with the metal pollution in wastewater. In this study, a biochar made from corn stalks was prepared and its adsorption characteristics for two heavy metals, Pb and Cd, were investigated by materials characterization and batch experiments. Biochar pyrolyzed from waste corn stalks at 400–600 °C, where biochar prepared at 600 °C (BC600) was used to perform following experiments. In materials characterization, the SEM images were initially used to reveal an obvious porous structure feature of corn stalk biochar, followed by XPS and FT-IR analyses unraveling the effects of functional groups in adsorption, especially for phenol and carboxyl groups. These functional groups provided vital adsorption sites. In batch experiment, batch experiments were conducted under different factors such as pH, temperature, and background ionic strength. The increase of pH and temperature can improve the adsorption capacity, whereas the ionic strength showed negative effects. The adsorption processes of both metals can be interpreted by fitting pseudo-first order model, as indicated in kinetic experiments, and the adsorption isotherm can be well described by the Langmuir model. Overall, this study revealed the characteristics of corn stalk biochar and deciphered the potential adsorption mechanisms. Full article
(This article belongs to the Special Issue Development of New Adsorbent Materials and Understanding Adsorption Mechanisms)
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