Natural and engineered clays and clay minerals for the removal of poly- and perfluoroalkyl substances from water: State-of-the-art and future perspectives

Mukhopadhyay, Raj; Sarkar, Binoy; Palansooriya, Kumuduni Niroshika; Dar, Jaffer Yousuf; Bolan, Nanthi; Parikh, Sanjai J.; Sonne, Christian; Ok, Yong Sik

doi:10.1016/j.cis.2021.102537

Cited by 77 publications

(20 citation statements)

References 146 publications

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“…To date, there are only a limited number of batch adsorption experimental studies on PFAS in clays. − For instance, Xiao et al reported that the adsorption of perfluorooctane sulfonic acid (PFOS) is much higher than that for perfluorooctanoic acid (PFOA) in kaolinite clay mineral. More importantly, recent studies have demonstrated that the adsorption of PFAS molecules with sulfonate and carboxylate functional groups is ten times higher in kaolinite than that in smectite mineral, montmorillonite. , In addition, Zhang et al reported that PFAS adsorption is strongly influenced by metal cations in clay minerals.…”

Section: Introductionmentioning

confidence: 99%

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

Loganathan

Wilson

2022

Environ. Sci. Technol.

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The ubiquitous presence of poly-and perfluoroalkyl substances (PFAS) in different natural settings poses a serious threat to environmental and human health. Soils and sediments represent one of the important exposure pathways of PFAS for humans and animals. With increasing bioaccumulation and mobility, it is extremely important to understand the interactions of PFAS molecules with the dominant constituents of soils such as clay minerals. This study reports for the first time the fundamental molecular-level insights into the adsorption, interfacial structure, and dynamics of short-and long-chain PFAS molecules at the water-saturated mesopores of kaolinite clay using classical molecular dynamics (MD) simulations. At environmental conditions, all the PFAS molecules are exclusively adsorbed near the hydroxyl surface of the kaolinite, irrespective of the terminal functional groups and metal cations. The interfacial adsorption structures and coordination environments of PFAS are strongly dependent on the nature of the functional groups and their hydrophobic chain length. The formation of large, aggregated clusters of long-chain PFAS at the hydroxyl surface of kaolinite is responsible for their restricted dynamics in comparison to short-chain PFAS molecules. Such comprehensive knowledge of PFAS at the clay mineral interface is critical to developing novel site-specific degradation and mitigation strategies.

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Section: Introductionmentioning

confidence: 99%

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

Loganathan

Wilson

2022

Environ. Sci. Technol.

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“…Other methods that could be explored include incineration of the spent adsorbent at high temperatures. 67 …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the regeneration of the spent adsorbent could be achieved by combining adsorption and photocatalytic processes before disposal in landfills. Other methods that could be explored include incineration of the spent adsorbent at high temperatures …”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

et al. 2022

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This study describes for the first time the synthesis, characterization, and application of a MnFe 2 O 3 /GO core–shell nanocomposite as an adsorbent for the removal of levofloxacin (Lev) from real water samples. The formation of the proposed nanocomposite was confirmed using various characterization techniques. The structural techniques revealed a 20 nm average particle size of the MnFe 2 O 3 /GO core–shell nanocomposite, with a surface area of 70.7 m 2 g –1 , as shown by the BET results. The most influential parameters (adsorbent dosage, stirring rate, and Lev pH) that affected the adsorption process were optimized using the response surface methodology (RSM) based on a central composite design. The optimum conditions were 0.007 g, 2, and 7 for adsorbent dosage, stirring rate, and Lev pH, respectively. The adsorption behavior of Lev on the MnFe 2 O 3 /GO core–shell nanocomposite was examined using isotherm models, kinetics, and thermodynamics. The kinetic models demonstrated that the adsorption process was controlled by both intraparticle and outer diffusion. Furthermore, the results obtained revealed that the adsorption of Lev on MnFe 2 O 3 /GO was dominated by electrostatic interactions. Moreover, Dubinin-Radushkevich and Temkin isotherms confirmed that the sorption mechanism was dominated by electrostatic interactions, while Langmuir and Sips models confirmed a monolayer adsorption process. The maximum adsorption capacity of Lev onto the MnFe 2 O 3 /GO adsorbent was found to be 129.9 mg g –1 . Furthermore, the thermodynamic data revealed that the adsorption system was spontaneous and exothermic. The synthesized MnFe 2 O 3 /GO core–shell nanocomposite showed significant recyclability and regenerability properties up to five adsorption–desorption cycles. As a proof of concept, the performance of the prepared adsorbent was evaluated for laboratory-scale purification of spiked real water samples. The prepared adsorbent significantly reduced the concentration of Lev in the real water samples and the removal efficiency ranged from 86 to 97%.

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“…Several reports suggest a variety of advanced processes for remediation, Ion exchange resins, carbon-based absorption, electrochemical degradation, and nanofiltration has shown a removal efficiency from 90 to 100% than conventional processes. However, more attention has been posed to shortchain PFAs, PFOA, and PFOS, some of these processes can be less efficient for this kind of compound (Lenka et al, 2021;Mukhopadhyay et al, 2021), due to their use as an alternative to long-chain ones, and to their high mobility in the water bodies, therefore short-chain PFAs removal is more challenging. For implementations to conventional treatment systems, nanofiltration and carbon-based absorption could be a more viable option (Gagliano et al, 2020;Dixit et al, 2021).…”

Section: Lab-scale Emerging Treatments For Polyfluoroalkyl and Perflu...mentioning

confidence: 99%

Detection and Tertiary Treatment Technologies of Poly-and Perfluoroalkyl Substances in Wastewater Treatment Plants

Araújo

Rodríguez-Hernández

González-González

et al. 2022

Front. Environ. Sci.

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PFAS are a very diverse group of anthropogenic chemicals used in various consumer and industrial products. The properties that characterize are their low degradability as well as their resistance to water, oil and heat. This results in their high persistence in the environment and bioaccumulation in different organisms, causing many adverse effects on the environment as well as in human health. Some of their effects remain unknown to this day. As there are thousands of registered PFAS, it is difficult to apply traditional technologies for an efficient removal and detection for all. This has made it difficult for wastewater treatment plants to remove or degrade PFAS before discharging the effluents into the environment. Also, monitoring these contaminants depends mostly on chromatography-based methods, which require expensive equipment and consumables, making it difficult to detect PFAS in the environment. The detection of PFAS in the environment, and the development of technologies to be implemented in tertiary treatment of wastewater treatment plants are topics of high concern. This study focuses on analyzing and discussing the mechanisms of occurrence, migration, transformation, and fate of PFAS in the environment, as well the main adverse effects in the environment and human health. The following work reviews the recent advances in the development of PFAS detection technologies (biosensors, electrochemical sensors, microfluidic devices), and removal/degradation methods (electrochemical degradation, enzymatic transformation, advanced oxidation, photocatalytic degradation). Understanding the risks to public health and identifying the routes of production, transportation, exposure to PFAS is extremely important to implement regulations for the detection and removal of PFAS in wastewater and the environment.

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Natural and engineered clays and clay minerals for the removal of poly- and perfluoroalkyl substances from water: State-of-the-art and future perspectives

Cited by 77 publications

References 146 publications

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

Detection and Tertiary Treatment Technologies of Poly-and Perfluoroalkyl Substances in Wastewater Treatment Plants

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Natural and engineered clays and clay minerals for the removal of poly- and perfluoroalkyl substances from water: State-of-the-art and future perspectives

Cited by 77 publications

References 146 publications

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

Adsorption, Structure, and Dynamics of Short- and Long-Chain PFAS Molecules in Kaolinite: Molecular-Level Insights

One-Step Synthesis of a Mn-Doped Fe2O3/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

Detection and Tertiary Treatment Technologies of Poly-and Perfluoroalkyl Substances in Wastewater Treatment Plants

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One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution