Highly efficient removal and real-time visual detection of fluoride ions using ratiometric CAU-10-NH2@RhB: Probe design, sensing performance, and practical applications

• Published in: Journal of hazardous materials Vol. 479; p. 135659
• Main Authors: Ju, Ping, Lu, Wenhui, Zhang, Guixue, Wang, Shuping, Li, Anzhang, Zhang, Qingxiang, Jiang, Long, Zhang, Ensheng, Qu, Fengli
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.11.2024
• Subjects: CAU-10-NH2@RhB; Fluoride ion absorption; Fluoride ion detection; Ratiometric fluorescent probe; Fluoride ion absorption; Fluoride ion detection; Ratiometric fluorescent probe; CAU-10-NH2@RhB
• ISSN: 0304-3894; 1873-3336; 1873-3336
• DOI: 10.1016/j.jhazmat.2024.135659

The extensive use of fluoride in agriculture, industry, medicine, and daily necessities has raised growing concerns about fluoride residue. To date, real-time visual detection and efficient removal of fluoride ions from water remain greatly desirable. Herein, nano-CAU-10-NH2@RhB is introduced as a ratiometric fluorescent probe and efficient scavenger for the intelligent detection and removal of fluoride ions. CAU-10-NH2@RhB is readily obtained through one-pot synthesis and exhibits high sensitivity and selectivity for real-time fluoride ion detection, with a naked-eye distinguishable color change from pink to blue. A portable device for point-of-care testing was developed based on color hue analysis readout using a smartphone. A quantitative response was achieved across a wide concentration range, with a detection limit of 54.2 nM. Adsorption experiments suggest that nano-CAU-10-NH2@RhB serves as an efficient fluoride ion scavenger, with a fluoride adsorption capacity of 49.3 mg/g. Moreover, the mechanistic study revealed that hydrogen bonds formed between fluoride ions and amino groups of CAU-10-NH2@RhB are crucial for the detection and adsorption of fluoride ions. This analysis platform was also used for point-of-care quantitative visual detection of fluoride ions in food, water, and toothpaste. [Display omitted] •Ratiometric fluorescence detection and high effective adsorption of fluoride ions.•Real-time and visual detection of fluoride ions with remarkable color change.•Portable devices and smartphone-based automated intelligent analysis.•Quantitative and semi-quantitative point-of-care testing.•User-friendly and cost-effective accessible for real-sample analysis.