科研之友
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摘要
The feasibility of UV-C irradiation (24 W, mercury lamp, 254 nm) to photolyze the soluble silver–thiosulfate complex was examined in this work. The photolysis parameters including initial silver concentration, initial thiosulfate concentration, initial pH, temperature which may potentially influence photolysis kinetic of complex solution were optimized to achieve silver recovery of 80.46% after 4 h. The characterization including X-ray diffraction (XRD), particle size distribution, SEM-EDS and X-ray photoelectron spectroscopy (XPS) were applied to confirm the composition of photoproducts as Ag2S, S, Ag, and elaborate mechanism of the photolysis reaction. The kinetic study revealed that it follows the first-order reaction kinetics, and the apparent rate constant (kobs) of photochemical reaction was calculated at different conditions. The rate constant equation of step reactions was solved at fix conditions, and the rate determination step is determined.
