2 research outputs found
CQDs-Doped Magnetic Electrospun Nanofibers: Fluorescence Self-Display and Adsorption Removal of Mercury(II)
This
paper reports the carbon quantum dots-doped magnetic electrospinning
nanofibers for the self-display and removal of HgÂ(II) ions from water.
The fluorescent carbon quantum dots and magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles were pre-prepared successfully, and they appeared
to be homogeneously dispersed in nanofibers via electrospinning. During
the sorption of HgÂ(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 HgÂ(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
Cellulosic Biomass-Reinforced Polyvinylidene Fluoride Separators with Enhanced Dielectric Properties and Thermal Tolerance
Safety
issues are critical barriers to large-scale energy storage applications
of lithium-ion batteries (LIBs). Using an ameliorated, thermally stable,
shutdown separator is an effective method to overcome the safety issues.
Herein, we demonstrate a novel, cellulosic biomass-material-blended
polyvinylidene fluoride separator that was prepared using a simple
nonsolvent-induced phase separation technique. This process formed
a microporous composite separator with reduced crystallinity, uniform
pore size distribution, superior thermal tolerance, and enhanced electrolyte
wettability and dielectric and mechanical properties. In addition,
the separator has a superior capacity retention and a better rate
capability compared to the commercialized microporous polypropylene
membrane. This fascinating membrane was fabricated via a relatively
eco-friendly and cost-effective method and is an alternative, promising
separator for high-power LIBs