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首页> 外文期刊>RSC Advances >Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion
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Silver-modified porous polystyrene sulfonate derived from Pickering high internal phase emulsions for capturing lithium-ion

机译：来自Pickering高内相乳液的银改性多孔聚苯乙烯磺酸盐，用于捕获锂离子

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摘要

Adsorption separation based on porous polystyrene sulfonate is an important method of extracting lithium ion (Li ~(+) ). In this work, silver-modified porous polystyrene sulfonate (PHIPEs-SS-Ag) derived from Pickering high internal phase emulsions was fabricated for the selective binding of Li ~(+) . PHIPEs-SS-Ag possessed porous polymer matrix, sufficient sulfonic acid functional groups, and uniformly immobilized silver particles, which were beneficial for improving mass transfer, binding amount and antifouling performance. In batch mode experiments, the adsorption capacity reached a maximum value ( i.e. 14.09 mg g ~(?1) ) under alkaline conditions, and the adsorption mechanism between PHIPEs-SS-Ag and Li ~(+) was electrostatic attraction. PHIPEs-SS-Ag exhibited fast binding kinetics at 25 °C ( i.e. 300 min), and the maximum monolayer adsorption amount from the Langmuir model for Li ~(+) are 59.85 mg g ~(?1) , 35.06 mg g ~(?1) , and 27.09 mg g ~(?1) at 15 °C, 25 °C, and 35 °C, respectively. Moreover, PHIPEs-SS-Ag displayed excellent selectivity for Li ~(+) in the presence of K ~(+) , Mg ~(2+) , and Na ~(+) , and maintained 80.71% of the initial adsorption capacity after seven sequential cycles of adsorption–regeneration. Therefore, this work opened up a universal route for the development of composite adsorbents for the specific separation of Li ~(+) .
机译：基于多孔聚苯乙烯磺酸盐的吸附分离是提取锂离子（Li〜（+））的重要方法。在这项工作中，制备了从Pickering高内相乳液中提取的银改性多孔聚苯乙烯磺酸盐（PHIPEs-SS-Ag），用于Li〜（+）的选择性结合。 PHIPEs-SS-Ag具有多孔的聚合物基质，足够的磺酸官能团和均匀固定的银颗粒，有利于改善传质，结合量和防污性能。在间歇模式实验中，碱性条件下吸附容量达到最大值（即14.09 mg g〜（？1）），PHIPEs-SS-Ag与Li〜（+）之间的吸附机理为静电吸引。 PHIPEs-SS-Ag在25°C（即300 min）时表现出快速的结合动力学，Langmuir模型对Li〜（+）的最大单层吸附量为59.85 mg g〜（？1），35.06 mg g〜（分别在15°C，25°C和35°C下测定（？1）和27.09 mg g（？1）。此外，PHIPEs-SS-Ag在K〜（+），Mg〜（2+）和Na〜（+）的存在下对Li〜（+）表现出优异的选择性，并在吸附后保持初始吸附容量的80.71％。吸附-再生的七个连续循环。因此，这项工作开辟了开发用于特定分离Li〜（+）的复合吸附剂的通用途径。

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