【摘要】 利用罗丹明6G-聚乙烯亚胺（R6G-PEI）对纤维素纳米晶（CNC）化学改性，制备了传感器CNC-PEI-R6G。利用FT-IR、XRD、XPS、UV-vis和PL等分析手段对CNC-PEI-R6G的组成结构和检测性能进行表征。研究表明，氧化时间的长短对双醛纤维素纳米晶（D-CNC）中醛基的含量影响很大。加入Fe³⁺时，观察到CNC-PEI-R6G溶液变为粉红色，且在566nm处的荧光强度显著增强，实现对水介质中Fe³⁺的肉眼检测和荧光选择性识别，检测限为0.03mg/kg。此外，CNC-PEI-R6G还可用于准确识别自来水和泳池水等实际水样中的Fe³⁺。更多还原

【Abstract】 The sensor CNC-PEI-R6G was prepared by chemically modifying cellulose nanocrystals （CNC） with rhodamine6G-polyethyleneimine （R6G-PEI）.The compositional structure and detection performances of CNC-PEI-R6G were characterized by analysis methods of FT-IR,XRD,XPS,UV-vis,and PL.It was found that oxidation time had a significant influence on the content of aldehyde groups in D-CNC.With the addition of Fe³⁺,CNC-PEI-R6G solutions turned pink,and the fluorescence intensity at 566 nm was significantly enhanced,realizing naked-eye detection and fluorescence selective recognition of Fe³⁺in aqueous media,and the detection limit was 0.03 mg/kg.In addition,CNC-PEI-R6G can also be used to accurately identify Fe³⁺in actual water samples such as tap water and swimming pool water.更多还原