Size-selective photoetching enabled precise size control of chalcopyrite AgInS 2 nanoparticles in a basic aqueous solution containing ammonia by selecting the wavelength of monochromatic irradiation light in the range between 650 and 520 nm. The energy gap of the photoetched particles was enlarged from 1.8 to 2.4 eV with a decrease in particle size from 5.1 to 2.7 nm due to the quantum size effect, while the crystal structure and chemical composition of the particles were unchanged after the photoetching processes. AgInS 2 nanoparticle-immobilized electrodes exhibited an anodic photocurrent similar to that of n-type semiconductors, the onset potential of which was negatively shifted with a decrease in particle size. Potentials of the conduction band edge (E CB ) and the valence band edge (E VB ) of AgInS 2 nanoparticles were estimated from their photoelectrochemical measurements, and they exhibited remarkable size dependence: with a decrease in particle size from 5.1 to 2.7 nm, E CB was shifted negatively from −0.6 to −1.0 V vs Ag/AgCl, accompanied by a positive shift of E VB from 1.3 to 1.7 V vs Ag/AgCl.
In
this paper, the adsorption performance of modified fly ash was evaluated
using a fixed-bed adsorption device. The influence of different inlet
concentrations of mercury in simulated flue gas and different concentrations
of HBr solution on the mercury absorption process was studied. The
results showed that, with the increase of the inlet mercury concentration
in the simulated flue gas, the adsorption capacity and adsorption
rate of the modified fly ash increased. With the increase of the HBr
concentration, the adsorption amount and adsorption rate of mercury
in simulated fly ash also increased. It was also found that the adsorption
process follows the pseudo-first-order adsorption kinetic model.
Nanoparticles of a ZnS–CuInS2–AgInS2 (Z-CAIS) solid solution were prepared successfully via the thermal decomposition of single precursors in a hot oleylamine solution, their band gap being controlled by varying the chemical composition of the precursors. The morphologies of the nanoparticles changed from spheres to rods with an increase in the ZnS content in the particles. The photoluminescence intensity of Z-CAIS was relatively large, while ZnS–CuInS2 and ZnS nanorods prepared under the same reaction conditions exhibited no photoluminescence.
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