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Carbon-Based Adsorbents for PFAS Remediation - Carbon Nanotubes?

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Carbon nanotube

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Carbon-based adsorbents, such as carbon nanotubes, have shown promising potential for PFAS remediation. Studies have highlighted the exceptional adsorption properties of carbon nanotubes due to their high surface area, porosity, and various adsorption sites . Functionalization of carbon nanotubes can enhance their adsorptive properties, making them selective towards specific pollutants like PFAS . Carbon nanotubes interact with PFAS through mechanisms like physical adsorption, electrostatic interactions, and chemical bonding . Additionally, novel nanocomposites like nNiFe-activated carbon have demonstrated significant PFAS reduction and fluoride generation, showing promise for PFAS transformation in both batch and flow conditions . These findings suggest that carbon-based adsorbents, including carbon nanotubes and nanocomposites, hold great potential for effective PFAS remediation strategies.

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Journal Article•DOI PFOA remediation from aqueous media using CTAB impregnated activated carbon: A closed-loop sustainable study with comprehensive selectivity analysis Mohd Ahmed Naim Shaikh, Paulami Sarkar, Tabish Nawaz - Show less +2 more 01 Aug 2023-Journal of water process engineering	Not addressed in the paper.
Open access•Journal Article•DOI PFAS removal from water by adsorption with alginate-encapsulated plant albumin and rice straw-derived biochar Iarin Medeiros Militao, Felicity A. Roddick, Linhua Fan, Lolita Cueva Zepeda, Rajarathinam Parthasarathy, Rosângela Bergamasco - Show less +5 more 01 Jul 2023-Journal of water process engineering 1 Citations	Not addressed in the paper.
Journal Article•DOI Carbon nanotubes-based adsorbents: Properties, functionalization, interaction mechanisms, and applications in water purification Muhammad Sajid, Muhammad Asif, Nadeem Baig, Muhamed Kabeer, Ihsanullah, Abdul Wahab Mohammad - Show less +5 more 01 Jun 2022-Journal of water process engineering 23 Citations	Carbon nanotubes-based adsorbents are effective for PFAS remediation due to their high surface area, porosity, and diverse interaction mechanisms, making them promising for water purification applications.
Open access•Journal Article•DOI Sorptive removal of short-chain perfluoroalkyl substances (PFAS) during drinking water treatment using activated carbon and anion exchanger Marcel Riegel, Brigitte Haist-Gulde, Frank Sacher - Show less +2 more 15 Feb 2023-Environmental Sciences Europe 3 Citations	Activated carbon, not carbon nanotubes, effectively removes short-chain PFAS like PFBA and PFPeA during drinking water treatment due to lower sorption affinity for short-chain PFAS.

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Activated carbons (ACs), such as granular activated carbon (GAC) and powdered activated carbon (PAC) for PFAS remediation?4 answersGranular activated carbon (GAC) and powdered activated carbon (PAC) are effective for per- and polyfluoroalkyl substances (PFAS) remediation. Studies show that GAC-1 and PAC-1 can remove over 90% of various PFAS compounds. The Polanyi Potential Adsorption Theory predicts GAC's efficacy for treating 428 PFAS chemicals, indicating GAC's potential for PFAS removal. Additionally, biochar-alginate beads with encapsulated rice straw-derived biochar show high removal efficiency for PFOS and PFBS, outperforming other natural material-based adsorbents. Bituminous GACs exhibit higher adsorption capacity for PFAS compared to GACs from coconut shells and lignite coal, with GAC regeneration methods proving effective for PFAS removal. Furthermore, rapid small‐scale column tests highlight the effectiveness of bituminous GACs like F400 and UC1240LD for PFAS removal from groundwaters.

What are the latest techniques in the field of PFAS remediation?5 answersThe latest techniques in PFAS remediation encompass a variety of innovative approaches. Photo-induced methods have emerged as promising for PFAS degradation, with ongoing research to enhance their efficiency and mechanisms. Electrosorption using redox-active metallopolymers shows potential for PFAS removal from water sources, offering high adsorption capacity and electrochemical regeneration capabilities. In groundwater treatment, colloidal activated carbon (CAC) injected at the air-water interface within PFAS source zones has shown effective attenuation of PFAS concentrations over time, highlighting a novel in situ remedial approach. Additionally, comprehensive reviews have outlined various thermal and non-thermal PFAS destruction technologies, including sonochemical degradation, electrical discharge plasma, and thermal desorption processes, emphasizing the importance of understanding removal mechanisms for efficient remediation. These diverse techniques collectively contribute to advancing PFAS remediation strategies.

What are ph effects on PFAS adsorption on activated carbon?4 answersThe pH of the solution has an effect on the adsorption of PFAS on activated carbon. Increasing pH decreases the sorption capacity of PFAS on activated carbon. Acidic conditions increase the adsorption capacity of PFAS due to the surface charge of the activated carbon and the properties of protonation of PFAS. The influence of pH on adsorption capacity is contrary for weak bases and weak acids, allowing for efficient separation by adsorption.

Removing pfas from water?5 answersA variety of methods have been proposed for removing PFAS from water. One approach is the use of activated carbon (AC) and aeration, which has been shown to enhance the removal of PFAS. Another method involves the use of anion exchange resins, which can effectively remove PFAS from water. Additionally, the development of PFAS-removing filters has been celebrated as a new advancement in water utility. Groundwater can also be a significant source of PFAS exposure in drinking water, and efforts are being made to develop standards for PFAS compounds. Furthermore, a water pollution treatment method involving the use of active bacteria and adsorbents has been proposed for removing impurities, including PFAS, from water.

What are the limitations of using activated carbon to remove PFAS from water?3 answersActivated carbon has limitations in removing PFAS from water. Short-chain PFAS, such as PFBA and PFPeA, can only be sufficiently removed with activated carbon over short run times. Additionally, the sorption affinity of short-chain PFAS is significantly lower than that of long-chain PFAS or short-chain PFSA. The use of ion exchange media for PFAS removal also has limitations, as it requires relatively short run times and higher material costs compared to activated carbon. However, ion exchangers can be regenerated and reused, resulting in potential economic advantages. The reactivation process of spent activated carbon has been shown to effectively remove and destroy PFAS compounds. Overall, while activated carbon is widely used for PFAS removal, its effectiveness may vary depending on the specific PFAS compounds and the duration of treatment.

Carbon based adsorbents for fluoride removal?5 answersCarbon-based adsorbents have been extensively studied for the removal of fluoride from water. Various carbon-based materials such as activated carbon, biochar, hydrochar, graphene, carbon dots, carbon nanotubes, and carbon nanocages have been used as adsorbents for fluoride removal. These adsorbents have shown promising performance in the adsorption of fluoride, as well as other inorganic and organic pollutants from water. Different preparation routes have been explored to obtain magnetic adsorbents from carbon-based sources, including the incorporation of a magnetic phase on the solid surface. The adsorption mechanisms and properties of these adsorbents have been extensively studied and analyzed. However, there are still challenges that need to be addressed, such as the physicochemical characterization of these adsorbents, the development of green and low-cost preparation methods, the regeneration and disposal of spent adsorbents, and their application in the multicomponent adsorption of water pollutants. Overall, carbon-based adsorbents offer a promising solution for fluoride removal from water.

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