.........
A very important new point is that once any Ag2O is formed (by say moving the equilibrium to the left from a possible loss of water on standing in an
open vessel or upon addition of dry alcohol), light can further accelerate the process. See, as a source, "Ag2O as a New Visible-Light Photocatalyst:
Self-Stability and High Photocatalytic Activity", by Xuefei Wang, link: http://onlinelibrary.wiley.com/doi/10.1002/chem.201101032/ab... . To quote from the abstract:
"Ag2O is unstable under visible-light irradiation and decomposes into metallic Ag during the photocatalytic decomposition of organic substances.
However, after partial in situ formation of Ag on the surface of Ag2O, the Ag2O-Ag composite can work as a stable and efficient visible-light
photocatalyst"
The use of photolysis and also other irradiation paths (like X-rays) are commonly associated with radical formation. Here is an interesting radiation
study, ‘The X-ray activated reduction of silver (I) solutions as a method for nanoparticles manufacturing' by M. Staszewski, et al., published in
Journal of Achievements in Materials and Manufacturing Engineering, Volume 28, Issue 1, May 2008, link: https://pdfs.semanticscholar.org/3877/7e9bee7cee0fba5e9bf41b... . To quote a passage discussing radiation treatment:
“The next step was aimed at eliminating glucose-containing ammonia solutions. The reactions taking place in these solutions resulted sometimes in
the formation of precipitates with unstable composition. These precipitates contained considerable amounts of silver nitride Ag3N, which formed in
some ammonia solutions of the silver salts and exhibited explosive properties in a dry state [15]. The results from analysis of the deposits obtained
for three selected types of solutions are presented in Table 1. “
As the irradiation of glucose is a path to radicals, my proposed mechanics incorporates an ostensible radical pathway......
Note, my suggested pathway is largely promoted from the recognition of Ag2O as a new (article was 2011) visible-light photocatalyst with the possible
introduction of contributing radical based reactions.
[Edited on 25-8-2018 by AJKOER] |