荧光水凝胶对汞离子的富集检测研究

The enrichment and detection of mercury ions in fluorescent hydrogels

汞离子在微生物的作用下可转化为易在生物体内积累的甲基汞,最终对人体造成损伤.因此,开发对废水中汞离子富集检测的异相传感器是监测控制水中重金属汞污染的关键.本文通过将水热反应合成的氮硫-碳点与水凝胶自组装制备了一种集富集检测一体化的荧光水凝胶.通过扫描电子显微镜(SEM)、傅里叶转换红外光谱(FTIR)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)等手段对AAH进行表征,结合静态吸附法研究了不同pH、温度、时间以及多种重金属离子共存等实验条件下AAH对Hg^(2+)的富集能力,并且通过荧光分析法研究了AAH对Hg^(2+)的检测能力.实验结果表明,AAH的多孔结构和丰富的化学基团对Hg^(2+)显示出良好的富集能力,最大吸附容量为606.06 mg/g.此外,通过荧光分析法研究了AAH对Hg^(2+)的检测能力,分析结果表明AAH中的氮硫-碳点对Hg^(2+)表现出了灵敏的荧光响应能力和高选择性.综上所述,AAH将在汞离子的富集监测等环境领域具有潜在的应用前景.

Mercury ions are easily converted into methylmercury,which is easy to accumulate in the body under the action of microorganisms and eventually cause damage to the human body.Therefore,the development of heterogeneous sensors for the enrichment and detection of mercury ion in wastewater is urgently required.In this paper,a fluorescent hydrogel integrating enrichment and detection is prepared by self-assembly combining hydrothermally synthesized nitrogen-sulfur-carbon dots with a hydrogel.The fluorescent hydrogel(AAH)is well characterized by scanning electron microscopy(SEM),Fourier Transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),and transmission electron microscopy(TEM),etc.The effects of solution pH,temperature,reaction time,and the Hg^(2+)enrichment ability in binary component system were investigated with static batch experiments on AAH.The porous structure and abundant chemical groups of AAH show excellent enrichment ability for mercury ions with the maximum adsorption capacity of 606.06 mg/g.In addition,the detection of Hg^(2+)by AAH is estimated by fluorescence analyses,which proves the sensitive fluorescence response and high selectivity to mercury ions.The results imply that AAH has great potential in environmental applications of mercury ion enrichment and monitoring.