基于锰、氯、氮共掺杂碳点的光学双模和智能手机成像检测Cr(Ⅵ)

Optical Dual-mode and Smartphone Imaging for Cr(Ⅵ)Detection Based on Manganese,Chlorine and Nitrogen Co-doped Carbon Dots

六价铬[Cr(Ⅵ)]具有毒性和致癌性,严重威胁人类健康,因此开发快速、灵敏、精准检测Cr(Ⅳ)的方法具有重要意义。该研究以邻苯二胺、对氨基苯甲酸、氯化锰和浓盐酸为反应前体,通过一步水热法合成了锰、氯、氮共掺杂碳点(Mn,Cl,N-CDs)。Mn,Cl,N-CDs能发出明亮且稳定的红色荧光,荧光量子产率为5.3%。基于聚集诱导和动态猝灭效应,Cr(Ⅵ)可使Mn,Cl,N-CDs的荧光强度和吸光度发生显著变化,基于此,开发了荧光和比色双模传感器及智能手机成像法,实现了Cr(Ⅵ)的灵敏检测。荧光法和比色法检测Cr(Ⅵ)的线性范围分别为33.8~469.5µmol/L和2.4~80.7µmol/L,智能手机成像检测Cr(Ⅵ)的线性范围为20.0~160.0µmol/L(可见光辐照)和80.0~170.0µmol/L(紫外光辐照)。该文不仅成功构建了智能手机成像定量检测Cr(Ⅵ)的传感器,同时为基于碳量子点构筑智能、便携、可视化传感器提供了新思路。

Hexavalent chromium[Cr(Ⅵ)]is toxic and carcinogenic,posing a significant threat to human health.Therefore,the development of rapid,sensitive and accurate methods for detecting Cr(Ⅵ)is of great importance.Herein,manganese,chlorine and nitrogen co-doped carbon dots(Mn,Cl,N-CDs)were synthesized by a one-step hydrothermal method using o-phenylenediamine,p-ami-nobenzoic acid,manganese chloride and concentrated hydrochloric acid as reaction precursors.Mn,Cl,N-CDs can emit bright and stable red fluorescence with a fluorescence quantum yield of 5.3%.Based on the aggregation-induced and dynamic quenching effects,the addition of Cr(Ⅵ)leads to a significant change in the fluorescence intensity and absorbance of Mn,Cl,N-CDs.Consequently,a dual-mode sensor for fluorescence and colorimetry,along with a smartphone imaging method,was developed to achieve sensitive detection of Cr(Ⅵ).The linear ranges of Cr(Ⅵ)were 33.8-469.5µmol/L and 2.4-80.7µmol/L for fluorescence and colorimetric methods,respectively,and 20.0-160.0µmol/L(visible light irradiation)and 80.0-170.0µmol/L(UV irradiation)for smartphone im-aging.This paper not only successfully constructed a sensor for the quantitative detection of Cr(Ⅵ)using smartphone imaging,but also introduced an innovative approach for creating intelligent,portable and visual sensors based on CDs.