Application of polyamide 56 nanofiber membrane loaded with coffee grounds carbon dots in Fe3+ detection

Baichuan Zhang; Zhaoxuan Liu; Dongliang Qian; Jun Sun; Jian-Jun Wang; Chuanxiang Qin; Lixing Dai; Guoqiang Chen

doi:10.1016/j.saa.2024.125440

Application of polyamide 56 nanofiber membrane loaded with coffee grounds carbon dots in Fe³⁺ detection

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Nov 15:328:125440. doi: 10.1016/j.saa.2024.125440. Online ahead of print.

Authors

Baichuan Zhang¹, Zhaoxuan Liu¹, Dongliang Qian¹, Jun Sun¹, Jian-Jun Wang¹, Chuanxiang Qin², Lixing Dai³, Guoqiang Chen⁴

Affiliations

¹ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
² College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. Electronic address: qinchuanxiang@suda.edu.cn.
³ College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China. Electronic address: dailixing@suda.edu.cn.
⁴ National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.

PMID: 39579724
DOI: 10.1016/j.saa.2024.125440

Abstract

One novel nanofiber membrane was fabricated which could detect Fe³⁺ with the help of either fluorescence spectrometer or smartphone. Coffee grounds carbon dots (CCDs) were prepared by the solvent-thermal method, followed by the fabrication of CCDs/polyamide 56 (PA56) composite nanofiber membrane through electrospinning process. The 4 % CCDs/PA56 composite nanofiber membrane (FNM4) maintained good fluorescence performance (λ_em = 554 nm, λ_ex = 470 nm) even after 5-runs quenching-recovery cycles. Its fluorescence could be quenched by Fe³⁺ with the limit of detection (LOD) of 0.74 μM when the fluorescence spectrometer was used. In addition, FNM4 could also detect Fe³⁺ by reading its RGB values using one smartphone and the lowest LOD was 4.31 μM when one Apple smartphone was used. The second method is portable to operate and eliminates the constraints of bulky laboratory equipment.

Keywords: Biomass carbon dots; CCDs/PA56 composite nanofiber membrane; Coffee grounds; Fe(3+) detection; Smartphone platform.