聚(丙烯酸-共聚-苯并-18-冠醚-6-丙烯酰胺)的铯离子响应特性及其铯离子检测性能

doi:10.16085/j.issn.1000-6613.2021-1453

摘要/Abstract

摘要：

制备了一种聚(丙烯酸-共聚-苯并-18-冠醚-6-丙烯酰胺)（PAB）线形共聚物，并系统研究了不同丙烯酸含量的PAB线形共聚物对铯离子的响应特性及其用于铯离子浓度检测的性能。结果表明，在不同浓度的铯离子溶液中，PAB线形共聚物的低临界溶解温度（LCST）会随着铯离子浓度增加向低温迁移；在实验范围内，当PAB线形共聚物中的丙烯酸质量分数为30%时，其铯离子响应特性最有利于水溶液中铯离子浓度的检测。通过系统实验研究，确立了PAB共聚物的LCST与水溶液中铯离子浓度的关系函数；利用该关系函数，可简单地通过测定未知铯离子浓度的PAB溶液LCST，即可推断出该溶液中的铯离子浓度。该研究为铯离子的便捷检测提供了新手段。

关键词: 智能高分子材料, 离子识别, 铯离子响应, 铯离子检测

Abstract:

In this study, poly(acrylic acid-co-benzo-18-crown-6-acrylamide) (PAB) linear copolymers were prepared, and the Cs⁺-responsive characteristics and Cs⁺-detection performances of PAB linear copolymers with different contents of acrylic acid groups were systematically investigated. The experimental results showed that the lower critical solution temperature (LCST) of PAB copolymers in aqueous solutions shifted to lower temperatures in aqueous Cs⁺ solutions with increasing Cs⁺ concentration. When the content of acrylic acid in PAB linear copolymers was 30% in the experimental range, the detection of Cs⁺ with PAB copolymers in aqueous solutions had the best performance. A relationship function between the LCST of PAB copolymers and Cs⁺ concentrations in aqueous solutions was established based on experimental results, with which the Cs⁺ concentration can be simply detected by observing the LCST of PAB copolymers in aqueous solutions. This study provided a new method for facile detection of Cs⁺.

Key words: smart polymeric materials, ion-recognition, cesium-ion-response, detection of cesium ions

中图分类号:

TQ317

秦海跃, 刘壮, 谢锐, 巨晓洁, 汪伟, 褚良银. 聚(丙烯酸-共聚-苯并-18-冠醚-6-丙烯酰胺)的铯离子响应特性及其铯离子检测性能[J]. 化工进展, 2022, 41(6): 3155-3161.

QIN Haiyue, LIU Zhuang, XIE Rui, JU Xiaojie, WANG Wei, CHU Liangyin. Cs⁺-responsive characteristics and Cs⁺-detection performances of poly(acrylic acid-co-benzo-18-crown-6-acrylamide)[J]. Chemical Industry and Engineering Progress, 2022, 41(6): 3155-3161.

图/表 8

图1 PAB共聚物的铯离子浓度检测原理

图2 PAB共聚物的合成路线

图3 PAB-3共聚物溶液在不同pH时的吸光度变化曲线

图4 PAB共聚物在不同浓度铯离子水溶液中LCST变化曲线

图5 PAB-3共聚物在pH为6的铯离子水溶液中LCST变化曲线

图6 PAB-3共聚物在铯离子水溶液中的LCST与铯离子浓度的关系

图7 PAB-3共聚物在a、b、d、c和e五种未知浓度的铯离子水溶液中升温过程的光学图片（实验中添加的PAB-3共聚物为2mg/mL，pH=6）

图8 铯离子水溶液浓度的预测曲线与实测值的对照图

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