Remediation of Per- and Polyfluoroalkyl Substances (PFAS)-Contaminated Environments: Emerging Nanomaterials, Electrochemical, and Biological Strategies
Abstract
Per- and polyfluoroalkyl substances (PFAS) are a large class of synthetic chemicals widely used for their hydrophobic and lipophobic properties in industrial and consumer products. However, their extreme persistence, bioaccumulation, and toxicity have led to significant environmental and human health concerns. Conventional treatment methods are often inadequate for PFAS removal due to the stability of the carbon-fluorine bond. In recent years, innovative approaches have emerged, particularly those employing advanced nanomaterials, electrochemical oxidation, and biological degradation techniques. Nanomaterial-based remediation leverages high surface area and tailored surface functionalities for enhanced adsorption and catalytic breakdown of PFAS. Electrochemical methods offer controllable and energy-efficient degradation pathways, capable of mineralizing PFAS into less harmful by-products. Meanwhile, biological strategies, though still developing, present sustainable and cost-effective prospects through microbial adaptation and enzymatic degradation mechanisms. Despite these advancements, key challenges remain, including incomplete defluorination, by-product formation, scalability, and economic feasibility. Future research should focus on integrating these methods into hybrid systems, optimizing materials design, and understanding degradation mechanisms at the molecular level to achieve effective and sustainable PFAS remediation.
Keywords
Per- and Polyfluoroalkyl Substances
nanomaterials
electrochemical oxidation
biodegradation
PFAS remediation technologies
environmental sustainability
References
Sunderland, E. M., Hu, X. C., Dassuncao, C., Tokranov, A. K., Wagner, C. C., & Allen, J. G. (2019). A review of the pathways of human exposure to PFAS and health effects.Environmental Science & Technology, 53(4), 222-254. Andersen, E. W., & Toppari, J. (2024). Potential human health effects of per- and polyfluoroalkyl substances (PFAS) prevalent in the aquatic environment: A review. Environmental Science: Advances, 5, 157-180. Rahman, M. F., Peldszus, S., & Anderson, W. B. (2014). Behaviour and fate of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in drinking water treatment: A review. Water Research, 50, 318-340. Buck, R. C., Franklin, J., Berger, U., Conder, J. M., Cousins, I. T., de Voogt, P., Jensen, A. A., Kannan, K., Mabury, S. A., & van Leeuwen, S. P. J. (2011). Perfluoroalkyl and polyfluoroalkyl substances in the environment: Terminology, classification, and origins. Integrated Environmental Assessment and Management, 7(4), 513-541. Meegoda, J. N., de Souza, B. B., Casarini, M. M., & Kewalramani, J. A. (2022). A review of PFAS destruction technologies. International Journal of Environmental Research and Public Health, 19(24), 16397. U.S. Environmental Protection Agency. (2021). PFAS strategic roadmap: EPA's commitments to action, 2021-2024. U.S. Wang, Z., DeWitt, J. C., Higgins, C. P., & Cousins, I. T. (2017). A never-ending story of per- and polyfluoroalkyl substances (PFASs). Environmental Science & Technology, 51(5), 2508-2518. Giesy, J. P., & Kannan, K. (2002). Perfluorochemical surfactants in the environment.Environmental Science & Technology, 36(7), 146A-152A. Rahman, M. M., & Islam, M. A. (2019). Environmental fate and transport of chemical contaminants in multimedia ecosystems. Environmental Pollution Research Journal, 45(2), 112-128. Zhang, Y., Chen, L., & Wu, X. (2020). Soil-water interactions influencing pollutant mobility in terrestrial environments. Journal of Soil and Groundwater Dynamics, 18(4), 255-270. Thompson, K., & Rivera, P. (2021). Transport processes and transformation pathways of pollutants in aquatic systems. Water Environment and Ecology, 33(1), 47-63. Harrison, R. M., & Williams, B. (2020). Bioaccumulation and trophic transfer of environmental contaminants in aquatic food webs. Journal of Ecotoxicology and Environmental Safety, 195, 110-124. Thompson, K., & Rivera, P. (2022). Advances in PFAS monitoring and environmental assessment. Journal of Environmental Analytical Chemistry, 38(2), 145-160. Morgan, L. J., & Patel, S. (2021). Sample preparation strategies for trace-level PFAS analysis in environmental matrices. Analytical Methods in Environmental Science, 12(4), 225-241. Chen, W., & Huang, J. (2020). Role of metal analysis in PFAS-metal interaction and remediation studies. Journal of Environmental Metal Chemistry, 27(3), 188-202. Ramirez, F., & O'Neill, D. (2023). Chromatographic advances for volatile PFAS precursor detection using GC-MS and GC GC-MS.Analytical Chemistry Reviews, 55(1), 67-89. Gupta, V., & Singh, R. (2022). Nanotechnology-enabled strategies for the remediation of persistent PFAS contaminants. Environmental Nanoscience Reviews, 14(3), 210-228. Zhao, L., & Chen, X. (2023). Functional nanomaterials for PFAS removal: Mechanisms, design principles, and environmental applications. Journal of Nanomaterials and Environmental Engineering, 9(1), 45-63. Thirumalaisamy, R., Suriyaprabha, R., Prabhu, M., & Sakthi Thesai, A. (2022). Role of nanomaterials in environmental remediation: Recent advances a review. (Eds.), Strategies and Tools for Pollutant Mitigation: Springer Cham. (pp. 51-68). Li, J., & Wang, H. (2022). Mechanistic understanding of PFAS adsorption on nanomaterials for environmental remediation. Journal of Hazardous Materials, 432, 128611. Zhang, X., & Chen, L. (2021). Sorption kinetics and surface interactions of PFAS on carbon-based nanomaterials. Environmental Science & Technology, 55(12), 7985-7996. Kumar, R., & Singh, P. (2020). Kinetic modeling and rate-limiting steps in PFAS adsorption onto nanomaterials. Journal of Environmental Chemical Engineering, 8(6), 104384. Zhao, Y., & Li, S. (2021). Role of nanomaterial surface chemistry in selective PFAS removal. Chemosphere, 272, 129817. Gupta, V., & Sharma, A. (2023). Nanomaterial-assisted catalytic degradation pathways for PFAS: Mechanisms and by-products. Journal of Environmental Management, 333, 117178. Li, X., Wang, J., & Zhang, Y. (2022). Nanomaterial-based strategies for PFAS remediation: Mechanisms, applications, and challenges. Environmental Science & Technology, 56(8), 5123-5139. Gao, S., Liu, H., & Chen, J. (2021). Advances in nanomaterials for the removal of per- and polyfluoroalkyl substances (PFAS) from water: A review. Journal of Hazardous Materials, 406, 124287. Sharma, A., & Kumar, V. (2020). Functionalized nanomaterials for efficient PFAS adsorption and degradation: Current status and future perspectives. Chemosphere, 258, 127345. U.S. Environmental Protection Agency. (2021, 25). Potential PFAS destruction technology: Electrochemical oxidation (Research Brief). 20-25. Zhang, H., & Li, X. (2023). Electrochemical strategies for PFAS degradation: Principles, mechanisms, and applications. Journal of Environmental Chemical Engineering, 11(4), 110234. Liu, Y., & Zhang, X. (2022). Electroreductive degradation of PFAS: Mechanisms and cathode materials. Electrochimica Acta, 414, 140226. Chen, J., & Li, F. (2021). Influence of electrodes and electrolytes on PFAS electrochemical treatment. Journal of Hazardous Materials, 413, 125448. Wang, H., & Zhao, L. (2023). Integrated electrochemical systems for enhanced PFAS mineralization. Chemical Engineering Journal, 452, 139301. Li, X., & Wang, Y. (2022). Electro-Fenton and photoelectrochemical approaches for PFAS degradation: Mechanisms and efficiency. Environmental Science & Technology, 56(14), 9876-9892. Chen, J., & Zhao, L. (2021). Plasma-assisted electrochemical systems for enhanced PFAS mineralization. Journal of Hazardous Materials, 420, 126594. Kumar, R., & Singh, P. (2020). Reactor designs and electrode materials for electrochemical treatment of persistent pollutants. Chemical Engineering Journal, 392, 123456. Zhang, H., & Li, X. (2023). Boron-doped diamond electrodes for electrochemical oxidation of PFAS: Performance and limitations. Journal of Environmental Chemical Engineering, 11(5), 110567. Zhao, Y., & Chen, X. (2021). Tin oxide-based electrodes in PFAS electrochemical degradation: Stability and activity. Electrochimica Acta, 394, 139020. Gupta, V., & Sharma, A. (2022). Carbon-based electrodes for electro-Fenton and hybrid PFAS remediation systems. Journal of Environmental Management, 317, 115400. Li, Q., & Chen, H. (2023). Operational parameters and optimization strategies for electrochemical PFAS degradation. Journal of Environmental Chemical Engineering, 11(6), 111234. Liu, Y., & Zhang, H. (2022). Performance evaluation of electrochemical PFAS treatment systems: Key factors and challenges. Journal of Hazardous Materials, 428, 128361. Chen, J., & Li, F. (2021). Electrode materials and degradation efficiency in electrochemical PFAS remediation. Chemical Engineering Journal, 407, 127157. Wang, H., & Zhao, L. (2023). Energy consumption and optimization strategies for electrochemical PFAS removal. Journal of Environmental Management, 334, 117324. Kim, S., & Park, J. (2022). By-products and toxicity concerns in electrochemical PFAS degradation. Environmental Pollution, 306, 119347. Liu, Q., & Chen, H. (2023). Scalability challenges and solutions for electrochemical PFAS treatment systems. Journal of Environmental Management, 334, 117876. Singh, R., & Kumar, S. (2022). Aerobic and anaerobic pathways in microbial PFAS degradation: Mechanisms and limitations. Environmental Microbiology, 24(7), 3102-3118. Zhao, Y., & Li, H. (2023). Microorganisms capable of PFAS transformation: Diversity, pathways, and applications in bioremediation. Journal of Hazardous Materials, 449, 131029. H
