PAM/SA/PVA基复合水凝胶可视化检测水中的Fe^(2+)研究  

Visual detection of Fe^(2+)in water by PAM/SA/PVA-based composite hydrogel

作　　者：陈琦 袁东 杜晓倩 奉阳润 Chen Qi;Yuan Dong;Du Xiaoqian;Feng Yangrun(College of Chemistry and Environmental Engineering,Sichuan University of Science&Engineering,Zigong 643000)

机构地区：[1]四川轻化工大学化学与环境工程学院,自贡643000

出　　处：《化工新型材料》2023年第7期254-258,265,共6页New Chemical Materials

基　　金：自贡市重点科技计划项目(2020YGJC22);四川轻化工大学研究生创新基金资助项目(D10501295)。

摘　　要：建立了基于聚丙烯酰胺/海藻酸钠/聚乙烯醇复合水凝胶可视化快速检测水中亚铁离子(Fe^(2+))的方法,以复合水凝胶为基础,采用离子交联法将金属离子显色试剂负载在凝胶网络中,制备出一种用于可视化检测Fe^(2+)的双网络结构水凝胶。这种具有双网络结构且与金属离子显色剂结合的高特异性水凝胶对Fe^(2+)有吸附作用,使Fe^(2+)得以不断被吸附于水凝胶之中,与水凝胶中的金属离子指示剂反应,并不断富集,实现快速对Fe^(2+)定性定量分析。该凝胶不易破损、方便携带,能够在现场快速判断出废水中Fe^(2+)浓度范围,实现对水中亚铁离子的简便、快速检测。在最佳实验条件下,Fe^(2+)浓度在10^(-4)~1g/L范围内与水凝胶显色后在波长为512nm处的紫外-可见吸光度呈线性关系,且凝胶的显色效果较好,能够通过肉眼直接确定水体中Fe^(2+)的浓度范围。该研究不仅能满足环境中Fe^(2+)的现场检测要求,还可为Fe^(2+)污染防治提供重要的依据。In this paper,a method based on PAM/SA/PVA composite hydrogel for the visual and rapid detection of ferrous ions(Fe^(2+))in water was established.Using ion cross-linking method,the metal ion chromogenic reagent was loaded into the gel network to prepare a dual-network structure hydrogel for the visual detection of Fe^(2+).This highly specific hydrogel with dual-network structure and combining with metal ion chromogenic reagent had adsorption effect on Fe^(2+),so that Fe^(2+)could be continuously adsorbed in the hydrogel,reacted with the metal ion indicator in the hydrogel,and continuously enriched to achieve rapid qualitative and quantitative analysis of Fe^(2+).The gel was not easily damaged and was convenient to carry,enabling quick determination the Fe^(2+)concentration range in wastewater on site,which realized simple and rapid detection of Fe^(2+)in water.Under the best experimental conditions,the Fe^(2+)concentration in the range of 10^(-4)~1g/L had a linear relationship with the ultraviolet-visible absorbance at a wavelength of 512 nm after color development with the hydrogel,and the color development effect of the gel was good enough for visually determining the concentration range of Fe^(2+)in the water body.This research not only met the requirements for on-site detection of Fe^(2+)in the environment,but also provided an important basis for the prevention and control of Fe^(2+)pollution.

关 键 词：水凝胶 亚铁离子 可视化检测 

分 类 号：TQ427[化学工程]