Adsorption of Emerging Water Pollutants by Advanced Materials
A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".
Deadline for manuscript submissions: 10 March 2025 | Viewed by 105
Special Issue Editor
Interests: adsorption technology; synthesis of nano-composites derived from agro-wastes for the removal of emerging contaminants; environmental and analytical method development to monitor chemicals of emerging concern
Special Issue Information
Dear Colleagues,
Over the years, many novel adsorbents derived from agricultural materials, highly porous and nano-structural materials have been developed and applied to remove toxic pollutants from a wide range of environmental matrices. The ease of synthesis/preparation of these novel adsorbents makes them economically viable and cost effective. Undoubtedly, the applications of these novel materials in a wide range of environmental remediation will play a pivotal role towards achieving the Sustainable Development Goals of Good health and Well-being and Clean Water and Sanitation.
Prof. Dr. Jonathan O. Okonkwo
Guest Editor
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Keywords
- novel materials
- adsorption
- removal
- toxic pollutants
- environmental matrices
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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: Enhanced Adsorption of Selected Per and Polyfluorinated Alkyl Substances by Phosphoric Acid Treated Maize Tassel
Authors: Okechukwu Jonathan Jonathan Okonkwo; Patricia Omo-Okoro; Pavlina Karakova; Lisa Melymuck; Opeyemi Amos Oyewo
Affiliation: Tshwane University of Technology
Abstract: Abstract: As regulatory limits for per- and polyfluoroalkyl substances (PFAS) become increasingly stringent, innovative and cost-effective water treatment technologies are urgently needed for efficient PFAS removal. The present study delves into 1) effect of adsorbent dosage (MT & CAMT) and kinetics of 10 PFAS chemicals, 2) pattern of PFOS and PFOA removal using MT and CAMT as a result of i) effect of stirring speed and temperature, ii) effect of concentration on the adsorption of PFOS and PFOA onto MT, CAMT and GAC, iii) pseudo order, iv) adsorption isotherms and v) adsorption modelling and adsorption capacities of MT and CAMT compared to other agro-based adsorbents. This approach gives a clear understanding of patterns and trends in the adsorption of PFAS chemicals from aqueous medium using unmodified and H3PO4 modified maize tassel termed MT and CAMT respectively. MT recorded higher percentage removal for long chain PFAS than for short chain PFAS; whereas, CAMT removed both short and long chain PFAS efficiently with higher percentage removal range. Results show that electrostatic forces of attraction and hydrophobic interaction may have influenced the adsorption mechanisms of PFOS and PFOA using MT and CAMT. Furthermore, perfluorocarbon chain length, functional group, molecular weight and solubility of PFAS may have also jointly influenced the adsorption process of PFAS. Freundlich model was more favourable than the Langmuir model. The recorded low ΔG0 and ΔH0 values suggest more of physical adsorption in the adsorption of PFOS and PFOA using both MT and CAMT, although the rate of adsorption kinetics of PFOS and PFOA indicated physicochemical adsorption process.
Title: Application of magnetic aquatic plant biochar for efficient removal of antimony from water: Adsorption properties and mechanism
Authors: Luyi Nan; Yuting Zhang; Min Liu; Liangyuan Zhao; Yuxuan Zhu; Xun Zhang
Affiliation: Changjiang River Scientific Research Institute
Abstract: Antimony (Sb) has been widely used in manufacturing industries, however, due to its toxicity, it had caused serious pollution problems in water. In order to efficiently control Sb pollution, the present study provided an efficient Sb adsorption material-the biochar and magnetic biochar prepared based on aquatic plants, and the adsorption properties and mechanism were studied. The results showed that arundo donax magnetic biochar (LMBC) had the highest antimony adsorption capacity with 97% removal rate, and its adsorption equilibrium time was 24 hours, the adsorption kinetic was more in line with quasi second-order kinetic model, the adsorption isotherm was fitted with Langmuir and Freundlich model, indicating that the adsorption process involved both physical adsorption and chemical adsorption. The analysis of BET, SEM, EDS, FTIR, XRD, XPS and VSM characterization showed that LMBC had large specific surface area and adsorption sites, which can adsorb Sb through redox reaction by Fe2+ and Fe3+. The study suggested that LMBC was promising for the absorption and removal of Sb in water.
