Adsorption of perfluorooctanoic acid (PFOA) onto anion exchange resin, non-ion exchange resin, and granular-activated carbon by batch and column

Abstract

A B S T R A C TPerfluorooctanoic acid (PFOA) has become a global concern due to its toxicity and persistent nature. It has been detected in water environments in recent years. Therefore, removal techniques are essential for minimizing human health risks and environmental impacts. The main objective of this study is to investigate the efficiency of adsorbents in the removal of batch and column PFOA. Batch adsorption experiments were conducted to study four adsorbents (PFA300, Dow Marathon A, XAD4, and GAC). The equilibrium adsorption data fitted well to the Freundlich isotherm for all adsorbents. PFA300 exhibited the maximum adsorption capacity (Freundlich K f value = 117). The continued removal of PFOA was conducted by column. PFA300 exhibited the best performance over the longest duration of operation. The Yoon-Nelson model was employed to predict the half-saturation times of all adsorbents. The adsorbents were tested for regeneration. PFA300 and XAD4 yielded high regeneration percentages. Based on the results, PFA300 was the most effective material for removing PFOA in water and wastewater because it exhibited the highest adsorption capacity, the longest duration of operation, and the highest PFOA recovery percentage.

The Price of Really Clean Water: Combining Nanofiltration with Granular Activated Carbon and Anion Exchange Resins for the Removal of Per- And Polyfluoralkyl Substances (PFASs) in Drinking Water Production

“…Generally, AIX resins were observed to have a larger capacity for both PFASs and DOC than the evaluated GAC materials. This has been observed before, and it is hypothesized that this is related to the fact that AIX adsorption sites and functional groups are more specific for PFAS adsorption than those of GAC. ,− The greatest total mass loading of PFASs was observed for the Purofine PFA694 resin, where the total mass of analyzed PFASs collected was 37 μg g –1 after 48 000 BV treated . When comparing the treatment of raw water to the treatment of the concentrate, both Filtrasorb 400 and Norit 1240 W adsorbed more PFAS mass from the NF concentrate per mass adsorbent, 15 and 18 μg g –1 , respectively, than from the more dilute raw water, 8.9 and 8.4 μg g –1 .…”

Selective and High Sorption of Perfluorooctanesulfonate and Perfluorooctanoate by Fluorinated Alkyl Chain Modified Montmorillonite

“…Anion-exchange resin and AC generally have excellent performance for PFOS and PFOA sorption among the reported adsorbents. , Several studies have investigated the sorption isotherms of PFOS and PFOA at μg/L level on the commercial adsorbents, and their comparison with F-MT is tabulated in Table S3. − Sorption capacity of PFOS and PFOA on adsorbents changed greatly with their equilibrium concentrations. Commonly, the concentrations of PFOS and PFOA in surface waters are below 1 μg/L, while those in wastewater as well as polluted surface water associated with PFAA industries or directly discharged wastewater can reach above 1 μg/L or even above 10 μg/L in severe cases. ,,, Therefore, 1, 10, and 100 μg/L were taken as the equilibrium concentrations in order to compare the sorption capacity of F-MT with the reported materials.…”

Reversible adsorption and desorption of PFAS on inexpensive graphite adsorbents via alternating electric field

“…48 However, most carbonaceous adsorbents exhibit a relatively low adsorption capacity (i.e., the amount of contaminant taken up by the unit mass of adsorbent) 49 for PFAS with a short uoroalkyl chain length. [50][51][52][53][54] Further, these absorbents oen suffer from a decrease in the adsorption capacity over time because the residual PFAS remains even aer the regeneration process. 55 Electric-eld aided sorption (i.e., electrosorption) is an emerging technology to remove ionized contaminants from water.…”