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. 2023 Apr 15:448:130853.
doi: 10.1016/j.jhazmat.2023.130853. Epub 2023 Jan 25.

Development of novel fluor mop materials for remediation of perfluoroalkyl substances (PFAS) from groundwater

Anuradha Singh  1 , Richard Lynch  1 , Jacob Solomon  1 , Jimmie D Weaver  2 , Alexa R May  3
Affiliations

Development of novel fluor mop materials for remediation of perfluoroalkyl substances (PFAS) from groundwater

Anuradha Singh et al. J Hazard Mater. .

Abstract

In this study we synthesized a library of 12 novel adsorbent materials that utilize a chemically well-defined silica support for superior removal of PFAS from real groundwater from a contaminated United States Air Force base. The library of sorbents probed the importance of a fluorous, hydrophobic, and electrostatic components in the removal efficacy. The materials were assessed in batch studies with PFOA, PFOS, and PFBA and compared directly to GAC and Ion Exchange resin. Adsorption kinetics with PFOS were best fit to a pseudo-second order model and equilibrium data fit well to a Langmuir isotherm model. The results were also validated externally, and the best performing material removed greater than 90% of 8 PFAS tested and was able to be regenerated up to 5 cycles. The results provide a top performing material that with further testing can be used to clean up environmentally contaminated water and provide support for the theory that a fluorous component when combined with the electrostatic and hydrophobic components, imparts both enhanced PFAS selectivity and functional resilience to the material.

Keywords: Adsorbent; Fluorous phasing; PFBA; PFOA; PFOS; Silica.

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Conflict of interest statement

Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests, Alexa May reports financial support was provided by Small Business Innovative Research and Small Business Technology Transfer. Anuradha Singh reports financial support was provided by AFWERX. Jimmie Weaver reports a relationship with Weaver Labs that includes: employment and equity or stocks. Anuradha Singh has patent pending to Anuradha Singh. Jimmie D. Weaver is co-founder and co-owner of Weaver Labs and benefits from its profit.

Figures

Figure 1.
Figure 1.
The Surface Modifications of Fluor Mop Materials
Figure 2.
Figure 2.
Fractional removal (%) of PFOA PFOS, and PFBA from Altus AFB groundwater
Figure 3.
Figure 3.
50 mL Altus AFB WL016 water samples were treated with 30 mg of sorbent in sextet. The treated and untreated control samples were shipped to Pace Analytical
Figure 4.
Figure 4.
10 mg of FMV8, FMV12, and control (no sorbent) were incubated with 50 mL Altus AFB Well 016 water and analyzed as described in above
Figure 5.
Figure 5.
(A) Kinetics of PFOS adsorption by FMV8 ([PFOS]0 = 2000 μg L−1 and [FMV8] = 200 mg L−1). B) PFOS adsorption isotherm by FMV8. Lines show fits to Langmuir (green) and Freundlich (blue) models. ([FMV8] = 20 mg L−1 All experiments were run in triplicate except for the control which was run in singlet.
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