Considerable areal capacitance (mF cm(-2) level) and long cycling stability (2000 cycles, the best ever for Fe(3)O(4)-based electrodes) are demonstrated for the first time for Fe(3)O(4)@SnO(2) core-shell nanorod film, which is grown directly on a current collector substrate.
This
paper describes the fabrication of covalent triazine framework
nanosheet-encapsulated Ag nanoparticles (Ag0@CTFN) via
a simple combination of the ultrasonic exfoliation and solution infiltration
method. The as-prepared Ag0@CTFN displays an order layered-sheet
structure with abundant micropores and mesopores, whereas ultrafine
Ag nanoparticles are confined and stabilized in their interlayers
through the interaction between N sites of triazine units and Ag nanoparticles.
Considering that the Ag0@CTFN possesses the merits of high
nitrogen, low density, and abundant basic sites, it was thus believed
to have enough abilities to adsorb and activate CO2 in
the CO2 conversion and catalysis. Importantly, the Ag0@CTFN, as a heterogeneous catalyst, showed highly catalytic
activity in the carboxylation of various alkynes with CO2 at ambient pressure and low temperature. This catalyst also exhibited
good functional group tolerance and excellent stability without any
significant loss of its activity after six recycles. This work not
only achieves valuable and novel composite material but also provides
the first application of covalent triazine framework nanosheets in
chemical conversion of CO2, opening a new field in preparing
recyclable heterogeneous catalysts to accelerate the utilization of
CO2.
Of a total of 528 729 workers exposed to benzene or benzene mixtures in China, 508 818 (96-23%) were examined. Altogether 2 676 cases of benzene poisoning were found, a prevalence of 0-51 %. A higher prevalence of benzene poisoning was found in the cities of Hangjou, Hefei, Nanjing, Shenyang, and Xian. The geometric mean concentration of benzene in 50 255 workplaces was 18 1 mg/m3 but 64-6% of the workplaces had less than 40 mg/m3. There was a positive correlation between the prevalence of benzene poisoning and the concentration in shoemaking factories. The prevalence of benzene induced aplastic anaemia in shoemakers was about 5 8 times that occurring in the general population. The results of this investigation show the need for a practicable hygiene standard to prevent benzene poisoning.
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