Open AccessHighly Sensitive Detection of Iron Ions in Aqueous Solutions Using Fluorescent Chitosan Nanoparticles Functionalized by Rhodamine B
Author(s) -
Zhiwei Liu,
Na Li,
Ping Liu,
Zhihui Qin,
Tifeng Jiao
Publication year - 2022
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c07071
Subject(s) - fluorescence , rhodamine b , chitosan , aqueous solution , chemistry , rhodamine , detection limit , quenching (fluorescence) , photochemistry , nanoparticle , metal ions in aqueous solution , ion , nuclear chemistry , inorganic chemistry , materials science , photocatalysis , nanotechnology , chromatography , organic chemistry , catalysis , physics , quantum mechanics
Detection of iron ions in aqueous solutions is of significant importance because of their important role in the environment and the human body. Herein, a fluorescent rhodamine B-functionalized chitosan nanoparticles probe is reported for the efficient detection of iron ions. The chitosan nanospheres-rhodamine B (CREN) was prepared by grafting rhodamine B onto the surface of chitosan nanospheres through an amidation reaction. The as-prepared CREN fluorescent probes exhibit high fluorescence intensity under ultraviolet light. When iron ions are added to the CREN solution, they can be coordinated with weak-field ligands such as N and O on the surface of chitosan nanoparticles (CSNP) by a high-spin method. The self-assembly of Fe 3+ on the surface of the CREN led to the generation of single electrons and the presence of high paramagnetism, resulting in fluorescence quenching. The quenching effect of Fe 3+ on the CREN fluorescent probe can achieve the efficient detection of Fe 3+ , and the detection limit reaches 10 -5 mol/mL. Moreover, this fluorescence quenching effect of Fe 3+ on the CREN fluorescent probe is specific, which could not be disturbed by other metal ions and counteranions.