Dual sensitive and selective sensor for Pb2+ and Al3+ with distinctive fluorescence response

• Published in: Sensors and actuators. B, Chemical Chemical, 2018-01, Vol.254, p.1094-1100
• Main Authors: Liu, Tianqi, Wan, Xuejuan, Yao, Youwei
• Format: Article
• Language: English
• Subjects: Al3+ ion; Dual-response; Pb2+ ion; Sensor
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2017.07.114

[Display omitted] •A dual selective sensor for Pb2+ and Al3+ is described.•The detection limit of probe towards Pb2+ was 8.3590×10−7M.•The detection limit of probe towards Al3+ was 1.0568×10−8M.•The probe can sense Pb2+ and Al3+ independently by modifying buffer concentration. A Rhodamine B based dual-response sensor was developed for the independent sensitive and selective fluorescence sensing of Pb2+ and Al3+. Initially, TQ1 exhibited one major fluorescence emission peak centered at 461nm in ethanol/HEPES solution (1/5, pH 7.4), where HEPES was 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid. After the addition of Pb2+, an obvious red shift of 55nm in fluorescence emission can be clearly observed, accompanied by a fluorescence color conversion, from bluish violet to greenish yellow under 365 UV light. As for Al3+, the fluorescence emission of TQ1 experienced a much more remarkable red shift of 124nm, and its fluorescence color also changed to red. Furthermore, the fluorescence sensing process of Pb2+ and Al3+ were completely independent and free from interference of each other via changing the buffer concentration. Detection limit of the probe TQ1 towards Pb2+ and Al3+ were 8.3590×10−7M (linear range 1.6–10.0μM) and 1.0568×10−8M (linear range 1.0–10.0μM) respectively. The complexation properties of TQ1 toward Pb2+ and Al3+ were studied in detail.