全氟烷基和多氟烷基混合物质在颗粒活性炭和苯乙烯-二乙烯基苯树脂上的吸附行为评估

IF 3 Q3 ENGINEERING, ENVIRONMENTAL
S. Sukeesan, N. Boontanon, S. Fujii, S. Boontanon
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引用次数: 0

摘要

由于全氟烷基和多氟烷基物质(PFAS)具有显著的化学结构,以及水的复杂条件,选择合适的吸附剂处理PFAS至关重要。吸附需要环保、低成本,并考虑在混合PFAS溶液中工作良好的吸附剂类型。在本研究中,我们使用混合PFAS来估计PFAS的活性。本研究旨在评估和比较不同吸附剂对水中PFAS的吸附效果:颗粒活性炭(GAC)、IRA 910(强阴离子树脂)和DOWEX MB‐50(混合交换树脂)。对全氟辛酸(PFOA)、全氟辛烷磺酸(PFOS)和全氟己烷磺酸(PFHxS)进行了分批吸附等温线和动力学研究。Freundlich模型一致地描述了具有高相关系数(R2 > 0.98)。GAC和IRA910对PFAS的吸附能力取决于链长(PFOS > PFOA > PFHxS)。DOWEX MB‐50的吸附能力因磺酸盐效应(全氟辛烷磺酸 > PFHxS > PFOA)。在96内观察到的代表PFAS在不同吸附剂上吸附的速率常数(k2) h由伪二阶(PSO)模型精确确定。GAC实现了遵循关系k2(全氟辛烷磺酸) > k2(全氟辛烷磺酸) > k2(PFHxS)。此外,IRA910的k2以k2的数量级下降(PFOA) > k2(全氟辛烷磺酸) > k2(PFHxS),这意味着IRA910在吸附PFCAs时比全氟烷(-烷基)磺酸更显著地促进疏水性。DOWEX MB‐50的动力学显示k2(PFHxS) > k2(全氟辛烷磺酸) > k2(全氟辛烷磺酸),因为像DOWEX MB‐50这样的凝胶型树脂更适合短链全氟辛烷酸。需要进一步的研究来确定有机物在自然条件下的作用,并评估操作复杂性引起的吸附选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the adsorption behavior of mixed perfluoroalkyl and polyfluoroalkyl substances onto granular activated carbon and Styrene‐divinylbenzene resins
Because of the remarkable chemical structure of perfluoroalkyl and polyfluoroalkyl substances (PFAS), as well as the complex conditions of water, selecting an appropriate adsorbent for treating PFAS is critical. Adsorption needs to be environmentally friendly, low cost, and consider the types of adsorbents that work well in mixed PFAS solutions. In the present study, we used mixed PFAS to estimate the PFAS activity. This research aimed to evaluate and compare the efficacy of the adsorption of PFAS from water using different adsorbents: granular activated carbon (GAC), IRA 910 (strong anion resin), and DOWEX MB‐50 (mixed exchange resin). Batch adsorption isotherms and kinetic studies were performed for perfluorooctanoic acid (PFOA), perfluorooctane sulfonic acid (PFOS), and perfluorohexane sulfonic acid (PFHxS). Freundlich models consistently described the kinetic behavior with a high correlation coefficient (R2 > 0.98). PFAS adsorption capacities on GAC and IRA910 were dependent on the chain length (PFOS > PFOA > PFHxS). The adsorption capacity of DOWEX MB‐50 decreased because of the sulfonate effects (PFOS > PFHxS > PFOA). The rate constants (k2) that represented the adsorption of PFAS on different adsorbents observed within 96 h were accurately determined by the pseudo‐second‐order (PSO) model. GAC achieved followed the relationship k2(PFOS) > k2(PFOA) > k2(PFHxS). Furthermore, k2 of IRA910 decreased in the order of k2(PFOA) > k2(PFOS) > k2(PFHxS), implying that IRA910 promoted hydrophobicity more significantly on the adsorption of PFCAs than perfluoroalkane (‐alkyl) sulfonic acids. The kinetics of DOWEX MB‐50 revealed k2(PFHxS) > k2(PFOS) > k2(PFOA) because gel‐type resins like DOWEX MB‐50 are more suitable for shorter‐chain PFAS. Further investigation is needed to determine the effect of organic matter under natural conditions and evaluate adsorptive selection caused by operational complexities.
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来源期刊
CiteScore
3.50
自引率
21.10%
发文量
37
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