Br-PADAP embedded in cellulose acetate electrospun nanofibers: Colorimetric sensor strips for visual uranyl recognition

• Published in: Journal of hazardous materials 2017-05, Vol.329, p.205-210
• Main Authors: Hu, Lin, Yan, Xue-Wu, Li, Qi, Zhang, Xue-Ji, Shan, Dan
• Format: Article
• Language: English
• Subjects: Br-PADAP; Cellulose acetate; Colorimetric strip; Electrospun nanofiber; Uranyl
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2017.01.038

[Display omitted] •A visual colorimetric strip was prepared through embedding Br-PADAP in CA electrospun nanofibers.•The prepared nanofibers showed well visual colorimetric recognition for uranyl.•A color-differentiation map based on the converted H values was proposed for quantitative analysis of uranyl. In this work, a new visual colorimetric strip based on cellulose acetate nanofiber mats modified by 2-(5-Bromo-2-pyridylazo)-5-(diethylamino) phenol was successfully prepared via electrospinning technology. The prepared colorimetric strip showed high sensitivity towards UO22+ with the yellow-to-purple color change signal. Upon the optimal conditions of solution pH at 6.0 and response time for 80min, the detection limit for UO22+ can reach 50 ppb. Moreover, the strip also exhibited excellent anti-interference ability in the presence of other metal ions. In order to achieve the quantitative detection for UO22+, a color-differentiation map was established, which was prepared from converted H values. Finally, the strip was also used to detect UO22+ in the seawater and showed high sensitivity.