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Separations publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue policies and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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Extraction and Characterization of Bioactive Compounds from Plant and Natural Sources

edited by

José Manuel Romero-Márquez

and

Alfonso Varela-López

submission deadline 30 Jun 2025 | 4 articles | Viewed by 4556

Keywords: extraction; characterization; bioactive compounds; natural sources; nutraceutical; plant materia

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Recent Advances in Rare Earth Separation and Extraction

edited by

Junlian Wang

and Na Sui

submission deadline 30 Jun 2025 | 1 articles | Viewed by 1338

Keywords: rare earths; solvent extraction; separation technology; extraction chromatography; recovery; low concentration enrichment; adsorption; calculations

(This special issue belongs to the Section Separation Engineering)

Analysis and Bioanalysis of Pharmaceuticals: Sample Preparation and Chromatography

edited by

Anne Marie Ciobanu

Daniela Baconi

George Traian Alexandru Burcea-Dragomiroiu

and

Carmen Lidia Chitescu

submission deadline 10 Jul 2025 | 6 articles | Viewed by 15685 | Submission Open

Keywords: chromatography; drug analysis; sample preparation; method validation; biological matrices; extraction; liquid chromatography; gas chromatography; pharmaceuticals; sample preparation; high-performance thin-layer chromatography

(This special issue belongs to the Section Chromatographic Separations)

Chromatography/Mass Spectrometry for the Determination of Food Authenticity and Food Analysis

edited by

Andreas Breidbach

submission deadline 10 Jul 2025 | 3 articles | Viewed by 6919 | Submission Open

Keywords: liquid chromatography; gas chromatography; mass spectrometry; adulteration; food fraud; multi variate analysis; authentication; high resolution MS

(This special issue belongs to the Section Analysis of Food and Beverages)

Photocatalytic Degradation of Organic Pollutant in Wastewater

edited by Ming Li

submission deadline 10 Jul 2025 | 1 articles | Viewed by 612 | Submission Open

Keywords: photocatalysis; functional materials; organic pollutants; wastewater; degradation

(This special issue belongs to the Section Environmental Separations)

Optimization of Advanced Separation Technologies for the Analysis of Emerging Contaminants

edited by

Barbara Benedetti

and

Caterina Durante

submission deadline 10 Jul 2025 | Viewed by 260 | Submission Open

Keywords: emerging contaminants; water; food contamination; design of experiments; multivariate analysis; gas chromatography; liquid chromatography; low- and high-resolution mass spectrometry; sample preparation

Advanced Oxidation Processes (AOPs) for Pollutant Removals in Wastewaters

edited by

Xiaolong Hao

submission deadline 10 Jul 2025 | Viewed by 109 | Submission Open

Keywords: advanced oxidation processes; chemical oxidation and reduction processes; electrochemical oxidation processes; catalytic oxidation technologies; photocatalytic redox processes

(This special issue belongs to the Section Environmental Separations)

Advances in Novel Beneficiation Technology of Critical Minerals

edited by Jue Kou

submission deadline 20 Jul 2025 | 1 articles | Viewed by 659 | Submission Open

Keywords: critical minerals; ore beneficiation; sensor-based ore sorting; flotation; gravity separation; magnetic separation; leaching

(This special issue belongs to the Section Environmental Separations)

Membrane Separation Technology for Water Treatment

edited by Jiajian Xing and Haiguang Zhang

submission deadline 20 Jul 2025 | Viewed by 155 | Submission Open

Keywords: ultrafiltration; emerging contaminant removal; surface modification; interfacial properties; advanced water treatment; electric field membrane

(This special issue belongs to the Section Environmental Separations)

Green Extraction Techniques for Bioactive Products from Natural Sources

edited by Katja Zocher, Nadia Boussetta and Christian Gusbeth

submission deadline 20 Jul 2025 | Viewed by 138 | Submission Open

Keywords: extraction; disruption; cell wall; solvent-free; sustainability; bioeconomy; natural products; metabolites; physical methods; microorganisms

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Research Progress of Gas–Solid Fluidized Dry Separation

edited by Chenyang Zhou

submission deadline 30 Jul 2025 | 3 articles | Viewed by 2793 | Submission Open

Keywords: gas-solid fluidized bed; bubble behavior; gas– solid fluidization simulation; dry coal separation; two-phase theory; bed density stability

(This special issue belongs to the Section Separation Engineering)

Novel Solvents and Methods for Extraction of Chemicals

edited by Silvia Fraterrigo Garofalo and Giuseppe Pipitone

submission deadline 31 Jul 2025 | 3 articles | Viewed by 4438 | Submission Open

Keywords: sustainable extraction; chemical separation; innovative solvents; environmental sustainability; advanced extraction methods

(This special issue belongs to the Section Separation Engineering)

Sample Preparation and Chromatographic Analysis of Environmental Samples

edited by Rosangela Elliani and

Antonio Tagarelli

submission deadline 31 Jul 2025 | 2 articles | Viewed by 883 | Submission Open

Keywords: assessment of several organic compounds; chromatography analysis; analytical parameters; multivariate optimization; sample extraction; enviromentally friendly analytical methods

(This special issue belongs to the Section Chromatographic Separations)

Novel Methods for the Analysis of Active and Toxic Components in Food

edited by

Lorena González-Gómez

and

Sonia Morante Zarcero

submission deadline 10 Aug 2025 | 1 articles | Viewed by 2237 | Submission Open

Keywords: food analysis; toxic compounds; bioactive compounds; micro-extractive methods; chromatography; food safety and quality; mass spectrometry; sample preparation; validated analytical methods; green methodologies

(This special issue belongs to the Section Analysis of Food and Beverages)

Adsorption/Degradation Methods for Water and Wastewater Treatment

edited by Milica Petrović,

Miloš Kostić

Slobodan Najdanović

Nena Velinov

and

Miljana Radović Vučić

submission deadline 10 Aug 2025 | 4 articles | Viewed by 2160 | Submission Open

Keywords: wastewater treatment; adsorption; electrodegradation; photodegradation; plasma degradation; (bio)sorbents; photocatalysts; plasma catalysts; pollutant removal

(This special issue belongs to the Section Purification Technology)

Design and Preparation of Environmental Functional Materials for Pollutant Removal

edited by Yujun Zhou and Jianfei Li

submission deadline 10 Aug 2025 | 1 articles | Viewed by 1875 | Submission Open

Keywords: wastewater treatment; membrane separation; electrochemical technology; adsorption; resource recovery; electrodes and reactor design; wastewater treatment

(This special issue belongs to the Section Materials in Separation Science)

Separation and Speciation of Emerging Pollutants in Soil and Groundwater

edited by

Enzhu Hu

submission deadline 10 Aug 2025 | 1 articles | Viewed by 700 | Submission Open

Keywords: emerging pollutants; soil and groundwater contamination; separation technology; environmental speciation; nano-pesticides; micro-/nano-plastics; per- and polyfluoroalkyl substances (PFASs); pharmaceuticals and personal care products (PPCPs); hydrometallurgical organic reagents; organophosphorus flame retardants (OPFRs)

(This special issue belongs to the Section Environmental Separations)

Absorption, Adsorption Technologies and Materials of Industrial Exhaust

edited by Zhi Qian and Le Sang

submission deadline 10 Aug 2025 | Viewed by 140 | Submission Open

Keywords: adsorption; material; process intensification; industrial exhaust; multiple pollutants; optimization; interdisciplinary; synergy; cutting-edge

(This special issue belongs to the Section Environmental Separations)

Application of Functional Materials in Gaseous Pollutant Removal

edited by Jingcai Chang

submission deadline 10 Aug 2025 | Viewed by 70 | Submission Open

Keywords: gaseous pollutant removal; atmospheric environmental governance; innovations in functional materials; low-energy technologies; monitoring and control of gaseous pollutants; membrane separation; feasibility analysis of practical applications of functional materials

Adsorption Process in Chemical Engineering

edited by Adrian Bonilla-Petriciolet,

Didilia Ileana Mendoza-Castillo

and Hilda Elizabeth Reynel-Ávila

submission deadline 20 Aug 2025 | 2 articles | Viewed by 5710 | Submission Open

Keywords: adsorbents; depollution; energy storage; environmental remediation; intensification; modeling; adsorption engineering; process systems engineering; sustainable separation; value-added products

Green Extraction Techniques of Bioactive Compounds from Natural Sources

edited by

Liliana Mihalcea

and

Mona Elena Popa

submission deadline 20 Aug 2025 | 2 articles | Viewed by 4637 | Submission Open

Keywords: natural sources; bioactive compounds; supercritical extraction; subcritical water extraction; chromatography; spectrometry; ultrasound-assisted extraction; microwave-assisted extraction; pressurized liquid extraction; enzyme-assisted extraction; bioeconomy

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Design and Preparation of Sustainable Separation Membrane for Efficient Water Purification

edited by

Shuping Wu

and

Rui Zhao

submission deadline 20 Aug 2025 | 2 articles | Viewed by 2861 | Submission Open

Keywords: membrane separation; water purification; sustainable materials; membrane fabrication; membrane characterization; desalination; wastewater treatment; bio-based membranes; carbon-based membranes; membrane fouling

(This special issue belongs to the Section Environmental Separations)

Advances in Photocatalysis for Environmental Pollutant Removal

edited by

Feigao Xu

submission deadline 20 Aug 2025 | 1 articles | Viewed by 631 | Submission Open

Keywords: photocatalysts; semiconductors; microstructure regulation; environmental pollutants; degradation; Fenton

(This special issue belongs to the Section Environmental Separations)

Removal of Emerging Pollutants from the Environmental Matrices

edited by

Waldemar Studziński

submission deadline 20 Aug 2025 | Viewed by 150 | Submission Open

Keywords: emerging pollutants (EPs); transformation products; wastewater treatment; micropollutants; toxicity; environmental protection; removal; sorption; separation

(This special issue belongs to the Section Environmental Separations)

Application of Advanced Materials and Technologies in the Separation and Adsorption

edited by Hao Wu

submission deadline 10 Sep 2025 | 9 articles | Viewed by 8819 | Submission Open

Keywords: advanced material; technology; separation; adsorption; pollutant treatment; efficient; low energy consumption; resource utilization

(This special issue belongs to the Section Materials in Separation Science)

Sustainable Biological Removal and Separation Processes in Wastewater Treatment

edited by

Xin Zhou

Shouqing Ni

and Guoqiang Liu

submission deadline 10 Sep 2025 | Viewed by 176 | Submission Open

Keywords: wastewater treatment and reclamation; biological nutrient removal; separation and purification; emerging pollutant removal; carbon footprint mitigation; resource recovery

(This special issue belongs to the Section Environmental Separations)

Perspectives on Water Treatment and Desalination

edited by Jiapeng Liu

submission deadline 10 Sep 2025 | Viewed by 97 | Submission Open

Keywords: water treatment; desalination; separation science; chemical engineering; environmental science; energy consumption; innovative electrode material

(This special issue belongs to the Section Environmental Separations)

New Approaches to Phosphorus Pollutant Control and Phosphorus Recovery

edited by Xuejiao Tang

submission deadline 10 Sep 2025 | Viewed by 92 | Submission Open

Keywords: phosphorus resource recovery; purification; crystallization separation; catalytic decomposition; high value-added

(This special issue belongs to the Section Environmental Separations)

Green Separation and Purification Technology

edited by

Shun Yao

submission deadline 20 Sep 2025 | 5 articles | Viewed by 6550 | Submission Open

(This special issue belongs to the Section Separation Engineering)

Recent Developments in Chemical Analysis of Bioactive Constituents of Plants and Plant Extracts

edited by

Constantinos Tsiafoulis

submission deadline 20 Sep 2025 | Viewed by 136 | Submission Open

Keywords: plant extract; bioactive constituents; food chemistry; method development; magnetic resonance spectroscopy; mass spectrometry; natural products

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Mapping Drug Fate and Activity: Chromatographic Strategies in Drug Research

edited by

Gonçalo J. Justino

and Pedro F. Pinheiro

submission deadline 20 Sep 2025 | Viewed by 130 | Submission Open

Keywords: drug metabolism; pharmacokinetics; chromatographic techniques; bioanalysis; analytical method development; drug toxicity

(This special issue belongs to the Section Bioanalysis/Clinical Analysis)

Advanced Treatment Technologies for Emerging Contaminant Control and Resource Utilization

edited by

Rui Qin

and

Ying Zhang

submission deadline 20 Sep 2025 | Viewed by 123 | Submission Open

Keywords: emerging contaminants; advanced oxidation processes; membrane filtration; adsorption; biological treatment; resource recovery

(This special issue belongs to the Section Environmental Separations)

Photoelectrocatalytic Organic Pollutant Degradation and Water Splitting

edited by Xingming Ning

submission deadline 30 Sep 2025 | Viewed by 46 | Submission Open

Keywords: interface charge transfer; organic pollutant degradation; photoelectrocatalytic; photogenerated charge carrier; charge separation; water splitting

(This special issue belongs to the Section Environmental Separations)

Research on New Technology and Equipment of Multiphase Flow Separation

edited by Chencan Du and Yubin Wang

submission deadline 10 Oct 2025 | 4 articles | Viewed by 5252 | Submission Open

Keywords: multiphase flow; separation technology; equipment design; process intensification; fluid dynamics; computational modeling; mass transfer; sustainable processes; environmental impact

(This special issue belongs to the Section Separation Engineering)

Determination and Quantification of Pharmaceuticals Using Chromatography Methods

edited by

Karol Wróblewski

and

Małgorzata Szultka-Młyńska

submission deadline 10 Oct 2025 | 1 articles | Viewed by 634 | Submission Open

Keywords: chromatography; method validation; drug analysis; pharmaceutical analysis; analytical method development; pharmaceutical formulations; mass spectrometry

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Green Extraction of Natural Products for Application in Pharmaceuticals, Foods, Cosmetics and Agriculture

edited by

Luicita Lagunez-Rivera

, Esther Ramirez Moreno and

Othmane Merah

submission deadline 10 Oct 2025 | 1 articles | Viewed by 591 | Submission Open

Keywords: plant species sources; orchids; primary metabolites; secondary metabolites; essential oils; fragrances; antioxidant activity; pharmaceutical application; nutraceutical application; molecular nutrition; intestinal bioaccessibility; agricultural uses

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Membrane Separation Process for Water Treatment

edited by Fang Li

submission deadline 10 Oct 2025 | 1 articles | Viewed by 535 | Submission Open

Keywords: advanced separation techniques; resource recovery; environmental conservation; water treatment; membrane separation process

(This special issue belongs to the Section Materials in Separation Science)

Electrochemical Separation and Recovery Technology in Wastewater Treatment

edited by

Ran Mao

submission deadline 10 Oct 2025 | Viewed by 122 | Submission Open

Keywords: electrochemical wastewater treatment; resource recovery; electrooxidation; electroreduction; heavy metal complexes; nitrate; phosphorus; electro-Fenton

(This special issue belongs to the Section Environmental Separations)

Innovative Sustainable Methods for Food Component Extraction

edited by

Nada Grahovac

, Zorica Stojanovic and Ana Đurović

submission deadline 10 Oct 2025 | Viewed by 74 | Submission Open

Keywords: sustainable separation; food extraction; environmental responsibility; resource minimization; innovative techniques; bioactive compounds; functional foods

(This special issue belongs to the Section Analysis of Food and Beverages)

Advances in Separation and Leaching for Metal Recovery

edited by Yun Li and

Hui Xu

submission deadline 15 Oct 2025 | Viewed by 46 | Submission Open

Keywords: metal recovery; separation; leaching; efficiency; selectivity; sustainable recovery

(This special issue belongs to the Section Separation Engineering)

Solid Waste Recycling and Strategic Metal Extraction

edited by

Lihui Gao

Daoguang Teng

Shulei Li

and Chunlin He

submission deadline 20 Oct 2025 | 1 articles | Viewed by 566 | Submission Open

Keywords: solid waste; biomass; adsorption material; wastewater treatment; strategic metal resources

(This special issue belongs to the Section Separation Engineering)

Separation Techniques for the Enrichment and Extraction of Rare Earth Elements

edited by Hongpeng Fan

submission deadline 20 Oct 2025 | Viewed by 89 | Submission Open

Keywords: rare earth elements (REEs); separation techniques; environmentally friendly processes; sustainability innovative approaches

(This special issue belongs to the Section Separation Engineering)

Application of Advanced Oxidation Processes (AOPs) in Wastewater Treatment

edited by Hongwei Sun

submission deadline 20 Oct 2025 | Viewed by 83 | Submission Open

Keywords: advanced oxidation processes; wastewater; catalysts; emerging pollutants; recalcitrant pollutants; cost evaluation; durability

(This special issue belongs to the Section Environmental Separations)

Isolation and Identification of Biologically Active Natural Compounds

edited by

Iulia Varzaru

and

Arabela Elena Untea

submission deadline 10 Nov 2025 | 5 articles | Viewed by 8185 | Submission Open

Keywords: plants; by-products; bioactive compounds; isolation methods; chromatography; antioxidant activity; antimicrobial activity; bioavailable compounds; nutraceuticals

(This special issue belongs to the Section Analysis of Natural Products and Pharmaceuticals)

Chemical and Contaminant Residue Analysis via Chromatography

edited by

Evangelia Tzanetou

and

Konstantinos M. Kasiotis

submission deadline 10 Nov 2025 | 3 articles | Viewed by 4657 | Submission Open

Keywords: liquid chromatography; gas chromatography; contaminants; residues; volatile organic compounds; mass spectrometry; food; environment; biological fluids; regulatory compliance; risk assessment

(This special issue belongs to the Section Chromatographic Separations)

Separation Techniques on a Miniaturized Scale

edited by

Fernando Lanças

and Deyber Arley Vargas Medina

submission deadline 10 Nov 2025 | 3 articles | Viewed by 3824 | Submission Open

Keywords: miniaturized sample preparation; sorbent-based microextraction; solvent-based microextraction; miniaturized instrumentation; green analytical chemistry; liquid chromatography; gas chromatography; open tubular liquid chromatography; capillary electrophoresis; microfluidic devices

(This special issue belongs to the Section Chromatographic Separations)

Innovative Separation Techniques for Adsorption and Control of Soil and Water Contaminants

edited by Niloofar Karimian

submission deadline 10 Nov 2025 | Viewed by 176 | Submission Open

Keywords: adsorption; soil and water remediation; contaminants; heavy metals; PFAS; biochar; nanomaterials; hybrid technologies; synchrotron spectroscopy; sustainable materials; separation techniques; environmentally friendly processes; sustainability innovative approaches

(This special issue belongs to the Section Purification Technology)

Eco-Friendly Innovations for Water Purification: Advanced Oxidation and Sustainable Cleanup Solutions

edited by

Szabolcs Bognár

Predrag Putnik

and

Daniela Šojić Merkulov

submission deadline 10 Nov 2025 | Viewed by 91 | Submission Open

Keywords: environmental pollution; water contamination; sustainable water treatment; advanced oxidation processes; electrochemical advanced oxidation processes; organic pollutant removal; green nanotechnology; bioinspired materials

(This special issue belongs to the Section Environmental Separations)

Advanced Separation Technology for Sludge Wastewater Treatment and Resource Utilization

edited by Bingdi Cao

submission deadline 10 Nov 2025 | Viewed by 83 | Submission Open

Keywords: sludge; solid– liquid separation; dewatering agent; extracellular polymeric substances (EPSs); electro-dewatering; coagulants

(This special issue belongs to the Section Purification Technology)

State of the Art and Challenges in the Analysis of Volatile Organic Compounds

edited by Jérôme Vial and