The N-modified carbon dots/graphitic carbon nitride (NCDs/g-C3N4) aerogel was successfully prepared by simple electrostatic self-assembly of NCDs and g-C3N4 nanosheets without any harmful solvents or cross-linking agents. The prepared aerogel...
Nitrogen-doped
carbon dots (NCDs) synthesized by the low-temperature
sintering method show electronegativity rich in −COO–,
−CO–NH–, −NH–, and −OH.
The structure, morphology, and fluorescence performance of NCDs were
successively characterized by Fourier-transform, infrared, X-ray photoelectron
spectroscopy, scanning electron microscopy, transmission electron
microscopy, photoluminescence, ultraviolet (UV), and X-ray fluorescence
analyses. On the one hand, NCDs can sensitively detect Pb2+ in water with a detection limit of 3 ppb through the dual response
of fluorescence emission spectra and UV absorbance spectra. On the
other hand, the negatively charged NCDs combine with various positively
charged heavy metal ions (Pb2+, Cu2+, Ni2+, Co2+, and Cd2+) through charge attraction
and coordination to form a hydrogel, thereby removing heavy metal
ions from the water. Among them, the removal rate of Pb2+ by NCDs is as high as 94.8%. It is the first time that pure NCDs
have been used to remove heavy metal ions quickly and easily in the
form of a reversible hydrogel. A simple way is to achieve ultrasensitive
detection and high-efficiency removal of heavy metal ions in water
with unitary NCDs.
The (Lu1-xScx)0.99Ce0.01BO3 (LSBO:Ce, x = 0 - 1) material libraries are successful prepared by combinatorial material technology and the crystal structures are characterized by high-throughput XRD platform in Shanghai Synchrotron...
The incorporation of Sc3+ can stabilize calcite-phase LuBO3:Ce3+ to grow large-sized single crystals but leads to the significant degradation of scintillation performance.
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