Abstract 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.

中文翻译：

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UV-C辐照光解硫代硫酸银配合物的动力学和机理研究

摘要 本工作研究了 UV-C 照射（24 W，汞灯，254 nm）光解可溶性硫代硫酸银络合物的可行性。优化光解参数，包括初始银浓度、初始硫代硫酸盐浓度、初始 pH 值、可能影响复合溶液光解动力学的温度，以在 4 小时后实现 80.46% 的银回收率。应用包括 X 射线衍射 (XRD)、粒度分布、SEM-EDS 和 X 射线光电子能谱 (XPS) 在内的表征来确认光产物的组成，如 Ag2S、S、Ag，以及光解反应的详细机制。动力学研究表明它遵循一级反应动力学，计算了不同条件下光化学反应的表观速率常数（kobs）。