摘要
Cr(Ⅵ)在水中溶解性很强,超过0.1 mg/L的Cr(Ⅵ)会对环境和生命健康产生毒害作用,因此开发灵敏度高的六价铬离子的检测方法就显得尤为重要。采用N-[3-(三甲氧基硅基)丙基]乙二胺,三甲基硅基咪唑作为双硅源前驱体,柠檬酸钠为还原剂,通过水热法可制备水分散性良好的球形双硅源硅量子点(D-Si QDs)。研究结果表明,D-Si QDs为球结构且表面含有大量氨基与咪唑基团。在最优条件下制备的D-Si QDs最佳激发波长为359 nm,最大发射波长为451 nm,有着较好的光稳定性。D-Si QDs的荧光可被Cr(Ⅵ)选择性猝灭,且荧光猝灭程度与Cr(Ⅵ)浓度在0.5~100μmol/L的范围内呈良好的线性关系,检测限为0.056μmol/L;对自来水样中检测Cr(Ⅵ)回收率在100.37%~105.83%,相对标准偏差均小于2.36%。研究为开发高灵敏度Cr(Ⅵ)检测的D-Si QDs荧光探针提供了思路。
Cr(Ⅵ)is highly soluble in water,and more than 0.1 mg/L of Cr(Ⅵ)can be toxic to the environment and life and health.Therefore,the exploitation of a sensitive method for the determination of hexavalent chromium ions is particularly important.Herein,N-[3-(trimethoxysilyl)propyl]ethylenediamine(DAMO)and trimethylsiliconazole(TSIM)were used as the double silicon source precursors,and sodium citrate was used as the reductive agent,and the spherical double silicon source silicon quantum dots(D-SiQDs)were prepared by hydrothermal method.Results showed that D-SiQDs had a spherical structure and a large number of amino and imidazole groups on the surface.Under the optimal conditions,the optimal excitation wavelength of D-SiQDs was 359 nm,and the maximum emission wavelength was 451 nm,and D-SiQDs had good light stability.The fluorescence of D-SiQDs could be selectively quenched by Cr(Ⅵ)and the fluorescence quenching degree as a good linear relationship with the concentration of Cr(Ⅵ)in the range of 0.5-100μmol/L.The detection limit was 0.056μmol/L.The recoveries of detecting Cr(Ⅵ)in tap water samples were in the range of 100.37%-105.83%,and the relative standard deviations were all less than 2.36%.Therefore,this paper provides an idea for developing D-SiQDs fluorescent probes for the high-sensitivity detection of Cr(Ⅵ).
作者
胡婷
李雪
李阳
陈子越
姚棋
陈华林
HU Ting;LI Xue;LI Yang;CHEN Ziyue;YAO Qi;CHEN Hualin(Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission,School of Chemistry and Environment,Southwest Minzu University,Chengdu 610041,China;College of Materials Science and Engineering,Guangdong Institute of Petrochemical Technology,Maoming52500,China;School of Ocean and Earth Science,Tongji University,Shanghai 200092,China)
出处
《皮革科学与工程》
CAS
北大核心
2024年第4期1-9,18,共10页
Leather Science and Engineering
基金
四川若尔盖高寒湿地生态系统国家野外科学观测研究站开放课题资助(项目编号:ZAW03)。
关键词
硅量子点
六价铬
荧光探针
荧光猝灭
Silicon quantum dots
hexavalent chromium
fluorescence detection
fluorescence quenching
