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Advances in Separation Science/Techniques: Separation, Extraction, Detection and Removal Approach...
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Advances in Separation Science/Techniques: Separation, Extraction, Detection and Removal Approach by Using Various Techniques

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Analytical Chemistry".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 4534

Special Issue Editor

Prof. Dr. Imran Ali

E-Mail Website
Guest Editor
Department of Chemistry, Jamia Millia Islamia (Central University), Jamia Nagar, New Delhi 110025, India
Interests: analytical, environmental and organic chemistry; pharmaceutical and xenobiotic analyses using chromatography and capillary electrophoresis; sample preparation; miniaturization in separation science; simple and chiral separations; chiral pollutants; water treatment using new-generation nano-adsorbents; water splitting using nano-materials; surfactant and colloidal chemistry

Special Issue Information

Dear Colleagues,

Separation science (analytical chemistry) is one of the most important aspects of human development. It is used in many areas of research, including medicines, pharmaceuticals, the environment and other industrial applications, and no branch of science can function optimally without it.

Modern analysis techniques of the last decade aim to fulfill the demand for green techniques in a wide range of applications and to enable inexpensive, effective, reproducible and eco-friendly analyses.

In this Special Issue, researchers are invited to contribute original research articles on separation, extraction, detection and removal approaches using various techniques. This issue aims to cover chromatography, capillary electrophoresis and other electrochemical techniques, as well as sample preparation methods. Water treatment requires strong and inexpensive separation/removal methods; therefore, this issue also aims to covers all water treatment, desalination and water recycling technologies.

Potential topics include, but are not limited to:

  • Simple and chiral separation using chromatography and capillary electrophoresis.
  • Analysis and detection using various electrochemical methods
  • Sample preparation methods in biological and environmental fluids.
  • Water treatment using adsorption, membranes, biodegradation, photodegradation and other electrochemical methods.
  • The development of advanced nanomaterials in sample preparation and water treatment.
  • Hyphenation of sample and separation methods.

Prof. Dr. Imran Ali
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. Molecules 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 2700 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

  • chromatography
  • capillary electrophoresis
  • electrochemical methods
  • sample preparation
  • hyphenation
  • pharmaceuticals
  • xenobiotics
  • metal ions
  • biological and environmental fluids
  • sample preparation
  • water treatment
  • adsorption
  • membranes
  • biodegradation
  • photodegradation
  • advanced nanomaterials

Published Papers (3 papers)

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Research

14 pages, 4295 KiB  
Article
Kinetics and Optimization of Metal Leaching from Heat-Resistant Nickel Alloy Solid Wastes
by Imran Ali, Anastasya Gaydukova, Tatiana Kon’kova, Zeid Abdullah ALOthman and Mika Sillanpää
Molecules 2023, 28(14), 5545; https://doi.org/10.3390/molecules28145545 - 20 Jul 2023
Cited by 1 | Viewed by 794
Abstract
Recycling waste from the production and consumption of heat-resistant alloys to return them to production is an urgent task due to the high cost of the components contained in these alloys. The kinetics and conditions of the acid leaching process of the grinding [...] Read more.
Recycling waste from the production and consumption of heat-resistant alloys to return them to production is an urgent task due to the high cost of the components contained in these alloys. The kinetics and conditions of the acid leaching process of the grinding waste of a heat-resistant nickel alloy are studied depending on the composition of the acid solution (H2SO4, HCl, HNO3, and their mixtures) at room temperature to boiling point temperature and various acid concentrations (1.5 to 3.0 mol/L), ratios of waste to solution (1:10 to 3:10), fraction sizes (0.04–1 mm), and contact duration (1 to 120 h). The linearization of experimental data by the Gray–Weddington, Gistling–Brownstein, and Kazeev–Erofeev equations showed that the rate of the leaching process was influenced by both the chemical reactions between sulfuric acid and metals included in the grinding waste and the diffusion of reagents through the film of reaction products and undissolved impurities. Optimal conditions for acid dissolution of the grinding waste have been established to obtain the maximum degree of extraction of the main component of the alloy, nickel. The processing of powder particles with a size of less than 0.1 mm should be carried out in a solution of sulfuric acid with a concentration of 3.0 mol/L at a temperature of 100 °C for 6 h with a ratio of solid to liquid phases of 1:10. The reported results are very important for industry personnel to recover metals and for environmentalists to treat the alloy waste. Full article
(This article belongs to the Special Issue Advances in Separation Science/Techniques: Separation, Extraction, Detection and Removal Approach by Using Various Techniques)
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18 pages, 2550 KiB  
Article
Efficient Removal of Hexavalent Chromium (Cr(VI)) from Wastewater Using Amide-Modified Biochar
by Ashraf Ali, Sarah Alharthi, Nora Hamad Al-Shaalan, Alia Naz and Hua-Jun Shawn Fan
Molecules 2023, 28(13), 5146; https://doi.org/10.3390/molecules28135146 - 30 Jun 2023
Cited by 4 | Viewed by 1895
Abstract
The utilization of biochar, derived from agricultural waste, has garnered attention as a valuable material for enhancing soil properties and serving as a substitute adsorbent for the elimination of hazardous heavy metals and organic contaminants from wastewater. In the present investigation, amide-modified biochar [...] Read more.
The utilization of biochar, derived from agricultural waste, has garnered attention as a valuable material for enhancing soil properties and serving as a substitute adsorbent for the elimination of hazardous heavy metals and organic contaminants from wastewater. In the present investigation, amide-modified biochar was synthesized via low-temperature pyrolysis of rice husk and was harnessed for the removal of Cr(VI) from wastewater. The resultant biochar was treated with 1-[3-(trimethoxysilyl) propyl] urea to incorporate an amide group. The amide-modified biochar was characterized by employing Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and X-ray diffraction (XRD) techniques. During batch experiments, the effect of various parameters, such as adsorbent dosage, metal concentration, time duration, and pH, on Cr(VI) removal was investigated. The optimal conditions for achieving maximum adsorption of Cr(VI) were observed at a pH 2, an adsorbent time of 60 min, an adsorbent dosage of 2 g/L, and a metal concentration of 100 mg/L. The percent removal efficiency of 97% was recorded for the removal of Cr(VI) under optimal conditions using amide-modified biochar. Freundlich, Langmuir, and Temkin isotherm models were utilized to calculate the adsorption data and determine the optimal fitting model. It was found that the adsorption data fitted well with the Langmuir isotherm model. A kinetics study revealed that the Cr(VI) adsorption onto ABC followed a pseudo-second-order kinetic model. The findings of this study indicate that amide-functionalized biochar has the potential to serve as an economically viable substitute adsorbent for the efficient removal of Cr(VI) from wastewater. Full article
(This article belongs to the Special Issue Advances in Separation Science/Techniques: Separation, Extraction, Detection and Removal Approach by Using Various Techniques)
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8 pages, 1155 KiB  
Communication
A Benzothiadiazole-Based Self-Assembled Cage for Cadmium Detection
by Zong-Cheng Wang, Ying-Zi Tan, Hui Yu, Wen-Hu Bao, Lin-Li Tang and Fei Zeng
Molecules 2023, 28(4), 1841; https://doi.org/10.3390/molecules28041841 - 15 Feb 2023
Cited by 3 | Viewed by 1415
Abstract
A turn-on fluorescent probe, cage 1, was efficiently self-assembled by condensing 4,4′-(benzothiadiazole-4,7-diyl)dibenzaldehyde and TREN in chloroform. The formation of cage 1 was characterized and confirmed by NMR spectroscopy, mass spectrometry, and theoretical calculations. The yield of cage 1 could be controlled by [...] Read more.
A turn-on fluorescent probe, cage 1, was efficiently self-assembled by condensing 4,4′-(benzothiadiazole-4,7-diyl)dibenzaldehyde and TREN in chloroform. The formation of cage 1 was characterized and confirmed by NMR spectroscopy, mass spectrometry, and theoretical calculations. The yield of cage 1 could be controlled by tuning the reaction conditions, such as the precursor concentration. Interestingly, the addition of 10 equiv of Cd2+ relative to cage 1 could increase the fluorescence almost seven-fold. 1H NMR and fluorescence experiments indicating fluorescence enhancement may be caused by the decomposition of cage 1. Such a high selectivity toward Cd2+ implies that the cage could potentially be employed in cadmium detection. Full article
(This article belongs to the Special Issue Advances in Separation Science/Techniques: Separation, Extraction, Detection and Removal Approach by Using Various Techniques)
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