ao7b01969_si_001.pdf (1.14 MB)
CQDs-Doped Magnetic Electrospun Nanofibers: Fluorescence Self-Display and Adsorption Removal of Mercury(II)
journal contribution
posted on 2018-04-16, 08:14 authored by Lei Li, Feijun Wang, Yanyan Lv, Jianxin Liu, Hongli Bian, Wenjun Wang, Yonghong Li, Ziqiang ShaoThis
paper reports the carbon quantum dots-doped magnetic electrospinning
nanofibers for the self-display and removal of Hg(II) ions from water.
The fluorescent carbon quantum dots and magnetic Fe3O4 nanoparticles were pre-prepared successfully, and they appeared
to be homogeneously dispersed in nanofibers via electrospinning. During
the sorption of Hg(II) ions, the significant fluorescence signals
of nanofibers gradually declined and exhibited a good linear relationship
with cumulative adsorption capacity, which could be easily recorded
by the photoluminescence spectra. The sorption performance of mercury
ions onto the nanofibers was investigated in terms of different experimental
factors including contact time, solution pH value, and initial ion
concentration. Considering the actual parameters, the nanofibers were
sensitive self-display adsorption system for Hg(II) ions in the existence
of other cation. The sorption data were described by different kinetic
models, which indicate that the whole sorption was controlled by chemical
adsorption. The intraparticle diffusion mass transfer was not obvious
in this system, which further proved the uniform adsorption and even
fluorescence quenching in nanofibers. Additionally, the nanocomposite
fiber could regenerate in several cycles with no significant loss
of adsorption capacity and fluorescence intensity. Thus, the nanofibers
are promising alternatives for environmental pollution incidents.
It is especially competent due to its high efficiency for self-display
and removal of high concentration of mercury ions.