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Mesoporous Polymer Nanosponges Immobilized with Functional Polyols for Rapid Removal of Boric Acid and Organic Micropollutants
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-06-27 00:00:00 , DOI: 10.1021/acsapm.9b00399
Xueping Liao 1, 2 , Qiang Zhang 1, 2
Affiliation  

Rapid removal of boric acid is important in many applications such as seawater desalination, boron extracting and water treatment. Although regarded as the most widely used boron-specific adsorbents, ion-exchange resins are often criticized because of the limited adsorption capacity and slow adsorption rate. Herein we report a copper-free synthesis route of mesoporous nanosponges with cis-diols functionalized on the surface, which are used for rapid removal of boric acid and organic micropollutants from water. Different cross-linking reagents are used to regulate the surface morphology and porous structure of cyclodextrin (CD)-scaffolded nanosponges. Staudinger reaction is then conducted to generate amine groups on the primary face of CD for subsequent reaction with d-(+)-gluconic acid δ-lactone, which successfully immobilize high-density cis-diols on the surface for efficient chelating with boric acid. Functional polymer nanosponges have shown similar boron adsorption capacity as the commercial resins, while the time to reach equilibrium adsorption is reduced dramatically from up to 2 days to tens of minutes (up to 60 times faster). Uptake of bisphenol A by these porous polymers is fast and the equilibrium adsorption could be attained in less than 2 min. The presence of immobilized polyols indicates a synergistic effect due to the secondary bonding, which simultaneously decrease the adsorption time and enhance the adsorption capacity. These findings demonstrate the potential application of polyol-functionalized mesoporous nanosponges in rapid flow-through water treatment.

中文翻译:

固定有功能多元醇的中孔聚合物纳米海绵,用于快速去除硼酸和有机微污染物

快速去除硼酸在许多应用中很重要,例如海水淡化,硼提取和水处理。尽管离子交换树脂被认为是使用最广泛的硼特定吸附剂,但由于其吸附能力有限且吸附速率较慢而经常受到批评。本文中,我们报道了介孔纳米海绵的无铜合成路线,其表面上官能化了顺式二醇,可用于从水中快速去除硼酸和有机微污染物。不同的交联剂用于调节环糊精(CD)支架纳米海绵的表面形态和多孔结构。然后进行Staudinger反应,在CD的主面上生成胺基,随后与d反应-(+)-葡萄糖酸δ-内酯,可将高密度的顺式-二醇成功地固定在表面,从而与硼酸有效螯合。功能性聚合物纳米海绵已显示出与市售树脂相似的硼吸附能力,而达到平衡吸附的时间则从最多2天减少到数十分钟(最多快60倍)。这些多孔聚合物对双酚A的吸收很快,并且可以在不到2分钟的时间内达到平衡吸附。固定多元醇的存在表明由于二次键合的协同作用,同时减少了吸附时间并提高了吸附能力。这些发现证明了多元醇官能化的介孔纳米海绵在快速流水处理中的潜在应用。
更新日期:2019-06-27
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