Adsorption Methods for Environmental Purification

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: 10 February 2026 | Viewed by 1064

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Laboratory of Spectroscopy, Molecular Modelling, Materials, Nanomaterials, Water and Environment, Environmental Materials Team, Department of Chemistry, Faculty of Sciences, Mohammed V University in Rabat, Av. Ibn Battouta, Rabat B.P. 1014, Morocco
Interests: chemistry; environment; material science
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Guest Editor
Laboratory of Spectroscopy, Molecular Modelling, Materials, Nanomaterials, Water and Environment, Environmental Materials Team, ENSAM, Mohammed V University in Rabat, Avenue des Forces Armées Royales, Rabat B.P. 6207, Morocco
Interests: chemistry; environnement; material science

Special Issue Information

Dear Colleagues,

Environmental pollution, driven by industrialization, urbanization, and unsustainable resource management, poses a critical challenge to global ecosystems and human health. The pursuit of efficient, cost-effective, and sustainable solutions for purifying contaminated air, water, and soil has therefore become a focal point in environmental science and engineering. Among these solutions, adsorption has emerged as one of the most versatile and effective methods for removing a wide range of pollutants, including heavy metals, dyes, organic compounds, and emerging contaminants such as pharmaceuticals and personal care products.

This Special Issue of Separations is dedicated to exploring recent advances in adsorption technologies for environmental purification. It aims to gather cutting-edge research on the development and optimization of adsorbent materials, including natural, synthetic, and nanostructured materials, as well as innovative adsorption processes and systems.

Key objectives of this Special Issue include the following:

  • Investigating novel adsorbents with enhanced capacity, selectivity, and regeneration properties;
  • Exploring the application of adsorption for the removal of a wide range of contaminants from air, water, and soil;
  • Advancing the understanding of adsorption mechanisms and kinetics;
  • Highlighting the role of adsorption in integrated water and waste management systems;
  • Promoting sustainability through the development of eco-friendly and low-cost adsorbents, such as agricultural waste-based materials or bioadsorbents.

We welcome original research articles, reviews, and case studies that address these topics, contributing to both the fundamental understanding and practical applications of adsorption in environmental purification.

This Special Issue aims to serve as a platform for scientists, engineers, and industry professionals to exchange knowledge and foster collaboration, ultimately advancing the field of adsorption and its applications for a cleaner and more sustainable environment.

Prof. Dr. Souad El Hajjaji
Prof. Dr. Najoua Labjar
Guest Editors

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Keywords

  • adsorption
  • pollutant removal
  • eco-friendly materials
  • nanostructured materials
  • adsorption mechanisms
  • kinetics

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Published Papers (1 paper)

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Research

26 pages, 3508 KB  
Article
Optimization of Organic Micropollutant Adsorption onto Granular Activated Carbon Using Response Surface Methodology
by Nora Samghouli, Najoua Labjar, Meryem Bensemlali, Hamid Nasrellah and Souad El Hajjaji
Separations 2025, 12(9), 254; https://doi.org/10.3390/separations12090254 - 21 Sep 2025
Abstract
Water pollution from pharmaceutical and textile industries urgently requires effective treatment solutions due to environmental and health risks. Effective treatment methods are desperately needed for water pollution from the textile and pharmaceutical industries because of the dangers to the environment and human health. [...] Read more.
Water pollution from pharmaceutical and textile industries urgently requires effective treatment solutions due to environmental and health risks. Effective treatment methods are desperately needed for water pollution from the textile and pharmaceutical industries because of the dangers to the environment and human health. To treat these micropollutants, the optimized granular activated carbon (OGAC) produced from olive fruit stones was utilized as an adsorbent in this study. The central composite design (CCD) of response surface methodology (RSM) was statistically used to optimize the operating factors for rhodamine B (RhB) and thiamphenicol (THI) removal efficiency on the optimized granular activated carbon. This study evaluated the influence of factors such as the solution’s pH, initial RhB and THI concentration, and OGAC dose, along with their interactions to model outcomes and determined optimal adsorption conditions on OGAC. The adsorption kinetic data will be analyzed using the intra-particle diffusion, pseudo-second-order, and pseudo-first-order models. Equilibrium data will be analyzed using the Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherms. The adsorption thermodynamics of the various systems under investigation will also be examined. Finally, a study on OGAC regeneration has been conducted. Results showed that THI and RhB removal is primarily influenced by pH, initial pollutant concentration, and dose. RSM indicated the optimal adsorption parameters for THI and RhB on OGAC as pH = 5.7, an initial concentration of C0 = 2.5 mg/L, and a dose of 6 g/L. The kinetic study revealed that THI and RhB retention on OGAC generally follows a pseudo-second-order kinetic model, indicating chemisorption as the primary mechanism controlling adsorption. The adsorption isotherm data analysis showed that chemisorption has a significant role in the THI and RhB adsorption process on OGAC. Furthermore, thermodynamic parameters suggest that THI adsorption on OGAC is exothermic, while RhB adsorption is endothermic. Activated carbon regeneration tests demonstrated its cost-effectiveness, and activated carbon was successfully regenerated over three cycles, achieving efficiencies of 62.39% for RhB and 59.6% for THI. These results demonstrate that the studied OGAC is an effective adsorbent for THI and RhB removal. Full article
(This article belongs to the Special Issue Adsorption Methods for Environmental Purification)
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