Superhigh adsorption of perfluorooctane sulfonate on aminated polyacrylonitrile fibers with the assistance of air bubbles
Superhigh adsorption of perfluorooctane sulfonate on aminated polyacrylonitrile fibers with the assistance of air bubbles
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气泡辅助下胺化聚丙烯腈纤维对全氟辛烷磺酸的超高吸附
DOI：
10.1016/j.cej.2017.01.033
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发表时间：
2017-05
影响因子：
15.1
通讯作者：
Yu Gang
中科院分区：
文献类型：
--
作者：
Meng Pingping;Deng Shubo;Wang Bin;Huang Jun;Wang Yujue;Yu Gang
气泡在吸附全氟辛烷磺酸（PFOS）中的作用通常被忽视，特别是气泡对亲水性吸附剂吸附全氟辛烷磺酸的影响仍不清楚。在这项研究中，我们第一次提出，气泡最初存在于溶液中或在振荡过程中形成的胺化聚丙烯腈纤维（APANFs）上的全氟辛烷磺酸的吸附起着重要的作用。在pH = 3时，APANF对PFOS的吸附容量高达15.0 mmol/g，且有气泡的辅助作用。空气泡对PFOS吸附的贡献随PFOS初始浓度的降低和溶液pH的升高而增大，当0.01 atm脱气24 h后，PFOS在APANFs上的吸附量降低了79%。相比之下，APANFs脱气对全氟辛烷磺酸吸附没有影响，这表明溶液中的气泡而不是APANFs起主导作用。PFOS在APANFs上的吸附不仅通过静电引力和胶束作用，而且还通过吸附气泡在气液界面处聚集PFOS。提出了一个新的气泡辅助下PFOS在APANF上的吸附模型，这一发现有助于制定PFOS的去除策略和理解PFOS在水环境中的迁移和归宿.
The role of air bubbles in the adsorption of perfluorooctane sulfonate (PFOS) is normally overlooked, and particularly the influence of air bubbles on PFOS adsorption onto hydrophilic adsorbents remains unclear. In this study, for the first time we propose that air bubbles originally existing in solution or being formed during shaking play an important role in the adsorption of PFOS on the aminated polyacrylonitrile fibers (APANFs). The APANFs possess a superhigh adsorption capacity of 15.0 mmol/g for PFOS at pH 3 with the assistance of air bubbles. The contribution of air bubbles to PFOS adsorption increases with the decrease of initial PFOS concentrations and the increase of solution pH. The adsorbed amount of PFOS on the APANFs deceases by 79% when 0.026 mmol/L PFOS solution at pH 6 is degassed at 0.01 atm for 24 h. By contrast, degassing the APANFs shows no influence on PFOS adsorption, suggesting the dominant contribution of air bubbles in solution rather than on the APANFs. PFOS is adsorbed on the APANFs via not only the electrostatic attraction and micelles, but also the adsorbed air bubbles with accumulated PFOS at gas-liquid interfaces. A new schematic sorption model of PFOS on the APANFs with the assistance of air bubbles is proposed, and this finding is helpful for developing PFOS removal strategy and understanding PFOS transport and fate in aquatic environments.
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