Highly efficient sorption of perfluorooctane sulfonate and perfluorooctanoate on a quaternized cotton prepared by atom transfer radical polymerization

Deng, Shubo; Zheng, Yang; Xu, Fu‐Jian; Wang, Bin; Huang, Jun; Yu, Gang

doi:10.1016/j.cej.2012.04.005

Cited by 108 publications

(44 citation statements)

References 30 publications

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“…Other adsorbents which have been shown to adsorb PFASs include chars, ash, and carbon nanotubes (Chen, Xia, Wang, Qiao, & Chen, ), activated carbon fibers (Zhi & Liu, , ), hydrotalcite (Rattanaoudom et al., ), Ambersorb (Zhi & Liu, ), imprinted polymers (Yu, Deng, & Yu, ), modified cotton and rice husk (Deng et al., ; Deng et al., ), porous aromatic frameworks (Luo, Zhao, Liu, & Ren, ), and cross‐linked cyclodextrins (Xiao, Ling, et al., ).…”

Section: Water Treatment Technologiesmentioning

confidence: 99%

A review of emerging technologies for remediation of PFASs

Ross

McDonough

Miles

et al. 2018

Remediation Journal

404

268

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The need for remediation of poly‐ and perfluoroalkyl substances (PFASs) is growing as a result of more regulatory attention to this new class of contaminants with diminishing water quality standards being promulgated, commonly in the parts per trillion range. PFASs comprise >3,000 individual compounds, but the focus of analyses and regulations has generally been PFASs termed perfluoroalkyl acids (PFAAs), which are all extremely persistent, can be highly mobile, and are increasingly being reported to bioaccumulate, with understanding of their toxicology evolving. However, there are thousands of polyfluorinated “PFAA precursors”, which can transform in the environment and in higher organisms to create PFAAs as persistent daughter products. Some PFASs can travel miles from their point of release, as they are mobile and persistent, potentially creating large plumes. The use of a conceptual site model (CSM) to define risks posed by specific PFASs to potential receptors is considered essential. Granular activated carbon (GAC) is commonly used as part of interim remedial measures to treat PFASs present in water. Many alternative treatment technologies are being adapted for PFASs or ingenious solutions developed. The diversity of PFASs commonly associated with use of multiple PFASs in commercial products is not commonly assessed. Remedial technologies, which are adsorptive or destructive, are considered for both soils and waters with challenges to their commercial application outlined. Biological approaches to treat PFASs report biotransformation which creates persistent PFAAs, no PFASs can biodegrade. Water treatment technologies applied ex situ could be used in a treatment train approach, for example, to concentrate PFASs and then destroy them on‐site. Dynamic groundwater recirculation can greatly enhance contaminant mass removal via groundwater pumping. This review of technologies for remediation of PFASs describes that: GAC may be effective for removal of long‐chain PFAAs, but does not perform well on short‐chain PFAAs and its use for removal of precursors is reported to be less effective; Anion‐exchange resins can remove a wider array of long‐ and short‐chain PFAAs, but struggle to treat the shortest chain PFAAs and removal of most PFAA precursors has not been evaluated; Ozofractionation has been applied for PFASs at full scale and shown to be effective for removal of total PFASs; Chemical oxidation has been demonstrated to be potentially applicable for some PFAAs, but when applied in situ there is concern over the formation of shorter chain PFAAs and ongoing rebound from sorbed precursors; Electrochemical oxidation is evolving as a destructive technology for many PFASs, but can create undesirable by‐products such as perchlorate and bromate; Sonolysis has been demonstrated as a potential destructive technology in the laboratory but there are significant challenges when considering scale up; Soils stabilization approaches are evolving and have been used at full scale but performance need to be assessed usin...

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Section: Water Treatment Technologiesmentioning

confidence: 99%

A review of emerging technologies for remediation of PFASs

Ross

McDonough

Miles

et al. 2018

Remediation Journal

404

268

View full text Add to dashboard Cite

show abstract

“…The slow adsorption kinetics was evidenced by the longer equilibration times that may restrict usage of such materials as practical sorbent materials. Recently, Deng and coworkers grafted long polymers with amine groups onto nonporous biomaterials, such as cotton [ 90 ] and rice husk [ 91 ], to target PFOA, PFOS, and perfluorobutyric acid (PFBA). By analogy to the chitosan-ECH NIPs described above, the adsorption of the PFCs on the surface of amine grafted biomaterials occurred via hydrophobic interactions and ion exchange, since such PFCs exist in their anion form when pH > pK a in aqueous solution.…”

Section: Adsorbents For Pfcsmentioning

confidence: 99%

Nano-Sized Cyclodextrin-Based Molecularly Imprinted Polymer Adsorbents for Perfluorinated Compounds—A Mini-Review

Karoyo

Wilson

2015

Nanomaterials

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Recent efforts have been directed towards the design of efficient and contaminant selective remediation technology for the removal of perfluorinated compounds (PFCs) from soils, sediments, and aquatic environments. While there is a general consensus on adsorption-based processes as the most suitable methodology for the removal of PFCs from aquatic environments, challenges exist regarding the optimal materials design of sorbents for selective uptake of PFCs. This article reviews the sorptive uptake of PFCs using cyclodextrin (CD)-based polymer adsorbents with nano- to micron-sized structural attributes. The relationship between synthesis of adsorbent materials and their structure relate to the overall sorption properties. Hence, the adsorptive uptake properties of CD-based molecularly imprinted polymers (CD-MIPs) are reviewed and compared with conventional MIPs. Further comparison is made with non-imprinted polymers (NIPs) that are based on cross-linking of pre-polymer units such as chitosan with epichlorohydrin in the absence of a molecular template. In general, MIPs offer the advantage of selectivity, chemical tunability, high stability and mechanical strength, ease of regeneration, and overall lower cost compared to NIPs. In particular, CD-MIPs offer the added advantage of possessing multiple binding sites with unique physicochemical properties such as tunable surface properties and morphology that may vary considerably. This mini-review provides a rationale for the design of unique polymer adsorbent materials that employ an intrinsic porogen via incorporation of a macrocyclic compound in the polymer framework to afford adsorbent materials with tunable physicochemical properties and unique nanostructure properties.

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“…The PAF-45 was found to be positively charged at acidic pH values, and its point of zero charge was pH 8.8 ( Figure S3 in SI). The increase in the capacity of PAF-45 to adsorb PFOS as the pH decreased was probably related to the increase in the strength of the electrostatic attraction as the pH decreased 10 38 39 40 41 42 . Non-electrostatic interactions (mainly hydrophobic interactions) tend to contribute more than electrostatic interactions to the amount of a species adsorbed, but adsorption through non-electrostatic interactions tends to be little affected by changes in the pH of a solution.…”

Section: Resultsmentioning

confidence: 99%

A Porous Aromatic Framework Constructed from Benzene Rings Has a High Adsorption Capacity for Perfluorooctane Sulfonate

Luo

Zhao

Liu

et al. 2016

Sci Rep

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A low-cost and easily constructed porous aromatic framework (PAF-45) was successfully prepared using the Scholl reaction. PAF-45 was, for the first time, used to remove perfluorooctane sulfonate (PFOS) from aqueous solution. Systematic experiments were performed to determine the adsorption capacity of PAF-45 for PFOS and to characterize the kinetics of the adsorption process. The adsorption of PFOS onto PAF-45 reached equilibrium in 30 min, and the adsorption capacity of PAF-45 for PFOS was excellent (5847 mg g−1 at pH 3). The amount of PFOS adsorbed by PAF-45 increased significantly as the cation (Na+, Mg2+, or Fe3+) concentration increased, which probably occurred because the cations enhanced the interactions between the negatively charged PFOS molecules and the positively charged PAF-45 surface. The cations Na+, Mg2+, and Fe3+ were found to form complexes with PFOS anions in solution. Density functional theory was used to identify the interactions between PFOS and Na+, Mg2+, and Fe3+. We expect that materials of the same type as PAF-45 could be useful adsorbents for removing organic pollutants from industrial wastewater and contaminated surface water.

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Highly efficient sorption of perfluorooctane sulfonate and perfluorooctanoate on a quaternized cotton prepared by atom transfer radical polymerization

Cited by 108 publications

References 30 publications

A review of emerging technologies for remediation of PFASs

A review of emerging technologies for remediation of PFASs

Nano-Sized Cyclodextrin-Based Molecularly Imprinted Polymer Adsorbents for Perfluorinated Compounds—A Mini-Review

A Porous Aromatic Framework Constructed from Benzene Rings Has a High Adsorption Capacity for Perfluorooctane Sulfonate

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