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首页> 美国卫生研究院文献>Royal Society Open Science >Adsorption behaviour and mechanism of the PFOS substitute OBS (sodium p-perfluorous nonenoxybenzene sulfonate) on activated carbon
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Adsorption behaviour and mechanism of the PFOS substitute OBS (sodium p-perfluorous nonenoxybenzene sulfonate) on activated carbon

机译：PFOS替代物OBS（对全氟壬氧基苯磺酸钠）在活性炭上的吸附行为和机理

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摘要

Perfluorooctane sulfonate (PFOS) was listed as a persistent organic pollutant by the Stockholm Convention. As a typical alternative to PFOS, sodium p-perfluorous nonenoxybenzene sulfonate (OBS) has recently been detected in the aquatic environment which has caused great concern. For the first time, the adsorption behaviour and mechanism of OBS on activated carbon (AC) with different physical and chemical properties were investigated. Decreasing the particle size of AC can accelerate its adsorption for OBS, while AC with too small particle size was not conducive to its adsorption capacity due to the destruction of its pore structure during the mechanical crushing process. Intra-particle diffusion had a lesser effect on the adsorption rate of AC with smaller particle size, higher hydrophilicity and larger pore size. Reactivation of AC by KOH can greatly enlarge their pore size and surface area, greatly increasing their adsorption capacities. The adsorption capacity of two kinds of R-GAC exceeded 0.35 mmol g−1, significantly higher than that of other ACs. However, increasing the hydrophilicity of AC would decrease their adsorption capacities. Further investigation indicated that a larger pore size and smaller particle size can greatly enhance the adsorptive removal of OBS on AC in systems with other coexisting PFASs and organic matter due to the reduction of the pore-blocking effect. The spent AC can be successfully regenerated by methanol, and it can be partly regenerated by hot water and NaOH solution. The percentage of regeneration for the spent AC was 70.4% with 90°C water temperature and up to 95% when 5% NaOH was added into the regeneration solution. These findings are very important for developing efficient adsorbents for the removal of these newly emerging PFASs from wastewater and understanding their interfacial behaviour.
机译：《斯德哥尔摩公约》将全氟辛烷磺酸（PFOS）列为持久性有机污染物。作为全氟辛烷磺酸的典型替代品，最近在水生环境中检测到对全氟壬氧基苯磺酸钠（OBS），引起了广泛关注。首次研究了OBS在不同理化性质的活性炭（AC）上的吸附行为和机理。降低AC的粒径可加快其对OBS的吸附，而粒径太小的AC则由于在机械破碎过程中破坏了孔结构而不利于其吸附能力。颗粒内扩散对AC的吸附速率影响较小，粒径较小，亲水性较高且孔径较大。通过KOH重新活化AC可以大大扩大其孔径和表面积，从而大大提高其吸附能力。两种R-GAC的吸附容量均超过0.35 mmol g -1 ，明显高于其他AC。但是，增加AC的亲水性会降低其吸附能力。进一步的研究表明，较大的孔径和较小的粒径，由于减少了阻塞孔的作用，可以在与其他共存的PFAS和有机物的体系中大大增强AC上OBS的吸附去除率。用过的AC可以用甲醇成功再生，也可以部分用热水和NaOH溶液再生。在水温为90°C时，废AC的再生百分比为70.4％，而在再生溶液中添加5％NaOH时，再生百分比高达95％。这些发现对于开发有效的吸附剂以从废水中去除这些新兴的PFAS并了解其界面行为非常重要。

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