Insights into the Understanding of Adsorption Behaviors of Legacy and Emerging Per- and Polyfluoroalkyl Substances (PFASs) on Various Anion-Exchange Resins

Tan, Hongming; Pan, Chang-Gui; Yin, Chao; Yu, Kefu

doi:10.3390/toxics11020161

Cited by 5 publications

(6 citation statements)

References 67 publications

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“…29 Associations differed by specific PFAS but were most consistent for perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA). 29 All but one of the previous studies were conducted in Scandinavian countries. The sole US study was conducted in a population having higher serum PFOA concentrations relative to the general US population.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have examined associations between pregnancy PFAS concentrations and breastfeeding duration. 7,23–29 In a recent systematic review of the six previous epidemiologic studies on this topic, five of the six found higher PFAS concentrations were associated with shorter breastfeeding duration. 29 Associations differed by specific PFAS but were most consistent for perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA).…”

Section: Introductionmentioning

confidence: 99%

“…7,23–29 In a recent systematic review of the six previous epidemiologic studies on this topic, five of the six found higher PFAS concentrations were associated with shorter breastfeeding duration. 29 Associations differed by specific PFAS but were most consistent for perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA). 29 All but one of the previous studies were conducted in Scandinavian countries.…”

Section: Introductionmentioning

confidence: 99%

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Maternal serum per- and polyfluoroalkyl substances during pregnancy and breastfeeding duration

Friedman

Dabelea

Keil

et al. 2023

Environmental Epidemiology

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Background/objectives: Per-and polyfluoroalkyl substances (PFAS) are endocrine-disrupting chemicals that may affect breastfeeding duration. We examined associations between maternal PFAS concentrations during pregnancy and breastfeeding cessation. We investigated potential effect modification by parity status. Methods: Among 555 women enrolled in the Healthy Start study (2009)(2010)(2011)(2012)(2013)(2014), we quantified maternal serum concentrations of 5 PFAS during mid-to late-pregnancy (mean 27 weeks of gestation). Participants self-reported their breastfeeding practices through 18-24 months postnatally. Among all participants and stratified by parity, we estimated associations between maternal PFAS concentrations and breastfeeding discontinuation by 3 and 6 months, using Poisson regression, and breastfeeding duration, using Cox regression. Results: Median PFAS concentrations were similar to those in the general US population. Associations between PFAS and breastfeeding duration differed by parity status. After adjusting for covariates, among primiparous women, associations between PFAS and breastfeeding cessation by 3 and 6 months were generally null, with some inverse associations. Among multiparous women, there were positive associations between perfluorohexane sulfonate, perfluorooctane sulfonate, perfluorooctanoate (PFOA), and perfluorononanoate and breastfeeding cessation by 3 and 6 months. For example, per ln-ng/mL increase in PFOA, the risk ratio for breastfeeding discontinuation by 6 months was 1.45 (95% confidence interval, 1.18, 1.78). Hazard ratios reflected similar patterns between PFAS and breastfeeding duration. Conclusions: Among primiparous women, we did not find evidence for associations between PFAS concentrations and breastfeeding duration. In contrast, among multiparous women, PFAS serum concentrations were generally inversely associated with breastfeeding duration, though estimates may be biased due to confounding by unmeasured previous breastfeeding.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Maternal serum per- and polyfluoroalkyl substances during pregnancy and breastfeeding duration

Friedman

Dabelea

Keil

et al. 2023

Environmental Epidemiology

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“…Some of the commercial ion-exchange resins studied in PFAS removal include IRA67, IRA910, Amb IRA400, PFA300, PFA400, PFA444, A520E, A600E, A500p, A860, and A532E [1,7,16]. Scientific research shows various ion exchange resins (HPR4700, S6368, and A111S) as of high interest in PFAS removal by adsorption techniques [17]. There have also been a few reports on using magnetic ion exchange (MIEX) resin that was produced by Orica Watercare and IXOM Australia (MIEX ® DOC resin) [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Ion Exchange MIEX® GOLD Resin as a Promising Sorbent for the Removal of PFAS Compounds

Tamanna,

Mahon,

Hockings

et al. 2023

Applied Sciences

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Per- and polyfluoroalkyl substances (PFASs) are synthetic compounds, which have been widely produced, used, and recently identified as extremely toxic chemicals, and are responsible for serious environmental and human health risks. In this study, the removal efficiency of MIEX® GOLD resin was tested against six PFAS compounds including perfluorobutanoic acid (PFBA), perfluorobutanesulfonic acid (PFBS), perfluorohexanoic acid (PFHxA), perfluorohexanesulfonic acid (PFHxS), perfluorooctanoic acid (PFOA), and perfluorooctanesulfonic acid (PFOS). The removal of PFASs and the regeneration of resin (NaCl-saturated methanol) were achieved via adsorption and desorption mechanisms. In all cases, the removal efficiency was greater than 99% where the volume ratio of 1 ppm PFAS to resin was maintained at 50-bed volume. Furthermore, the adsorption capacity of MIEX® GOLD resin was studied for PFOA and PFHxS and achieved 1.05 ± 0.01 g PFOA adsorption and 1.01 ± 0.04 g PFHxS adsorption per gram of resin. In addition, a detailed study on the interference of natural organic matter (NOM) and inorganic matter was carried out against PFHxA, PFOA, and PFOS. The presence of 10 ppm NOM (5 ppm tannic acid + 5 ppm humic acid) and 25 ppm inorganic matter (5 ppm nitrate + 20 ppm sulfate) showed no noticeable interference in the removal of selected PFAS compounds. Compared to sulfonic acid-containing PFASs, the interference of organic and inorganic matter on carboxylic acid-containing PFASs was slightly higher. The regeneration of PFAS-adsorbed resin was studied using a mixed solution containing 70% methanol and saturated NaCl. Desorption of PFHxS, PFOS, and PFOA was found to be 98.3, 100, and 43.3%, respectively. The results again indicate that the resin regeneration is strongly affected by the functional group of PFASs; i.e., resin with sulfonic acid-containing PFAS is much easier to regenerate than carboxylic acid-containing PFAS compounds. All the PFAS analyses were performed by using mass spectroscopy and liquid chromatography–mass spectroscopy. In conclusion, this study confirms the remarkable efficiency of MIEX® GOLD resin in removing PFAS compounds, even in the presence of a high concentration of organic and inorganic interferences, and its capacity to be regenerated for repeated usage. These advantages make MIEX® GOLD a promising product for the remediation of PFAS-contaminated water. This study in the broader sense proves that MIEX® GOLD is a promising adsorbent and provides the ground for future study to treat contaminated groundwater.

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“…The biosorbents present several advantages in comparison to traditional adsorbents, such as they are produced by simple and low-cost processes, they have high efficiency, and they are ease to use and environmentally friendly. Whereas the traditional synthetic adsorbents are mainly manufactured from non-biosourced materials, such as synthetic polymers 33 – 35 , ion exchange resins 36 , 37 and activated carbon 38 – 40 ; this means that they are not biodegradable. Their production consumes great amounts of raw materials and energy and can generate toxic by-products and have net negative environmental fingerprint.…”

Section: Introductionmentioning

confidence: 99%

High biosorption of cationic dye onto a novel material based on paper mill sludge

Merah,

Boudoukha,

Avalos Ramirez

et al. 2023

Sci Rep

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The valorization of paper mill sludge (PMS) is the main goal of this study. The emissions of PMS continue to increase at global scale, especially from packaging paper and board sectors. The raw sludge was used to prepare an adsorbent to remove toxic pollutants from wastewater, the methylene blue (MB), an organic dye. Firstly, the physico-chemical characterization of PMS was done determining the crystalline phases of PMS fibers, the content of main elements, and the pH zero point charge, which was determined at around pH 7. The adsorption of MB on PMS powder was studied at 18 °C with an agitation of 200 rpm, being the best operating conditions 30 min of contact time, 250 mg L−1 of initial MB concentration and 0.05 g in 25 mL of adsorbent dose. Experimental data of MB adsorption was fitted to Langmuir and Freundlich isotherm equations. The Langmuir model was more accurate for the equilibrium data of MB adsorption at pH 5.1. The PFOM and PSOM were adjusted to experimental adsorption kinetics data, being PSOM, which describes better the MB adsorption by PMS powder. This was confirmed by calculating the maximum adsorption capacity with PSOM, which was 42.7 mg g−1, being nearly similar of the experimental value of 43.5 mg g−1. The analysis of adsorption thermodynamics showed that the MB was adsorbed exothermically with a ΔH0 = − 20.78 kJ mol−1, and spontaneously with ΔG0 from − 0.99 to − 6.38 kJ mol−1 in the range of temperature from 291 to 363 K, respectively. These results confirm that the sludge from paper industry can be used as biosorbent with remarkable adsorption capacity and low cost for the treatment of wastewater. PMS can be applied in the future for the depollution of the effluents from the textile industry, which are highly charged with dyes.

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Insights into the Understanding of Adsorption Behaviors of Legacy and Emerging Per- and Polyfluoroalkyl Substances (PFASs) on Various Anion-Exchange Resins

Cited by 5 publications

References 67 publications

Maternal serum per- and polyfluoroalkyl substances during pregnancy and breastfeeding duration

Maternal serum per- and polyfluoroalkyl substances during pregnancy and breastfeeding duration

Ion Exchange MIEX® GOLD Resin as a Promising Sorbent for the Removal of PFAS Compounds

High biosorption of cationic dye onto a novel material based on paper mill sludge

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