Abstract
AbstractPhotocatalytic reduction of AgI2SO4 from aqueous solutions is observed in the presence of Dawson‐derived sandwich type polyoxometalates (POMs) [M4(P2W15O56)2]16−, M = Co2+, Ni2+ and Zn2+ as photocatalyst and an organic substrate (propan‐2‐ol) as sacrificial electron donor. The direct photochemical excitation of the Dawson‐derived sandwich type polyoxometalates in the presence of propan‐2‐ol leads to its reduction. That first reduction step induces electron transfer to Ag+ ions to give Ag0 metal atoms which then form by aggregation colloidal metal nanoparticles stabilized by POM. In the case of [Co4(P2W15O56)2]16−, TEM experiments reveal that the Agn particles obtained with a slight excess of Ag+ are almost spherical with size in the range 20 – 50 nm. However, in a large excess of Ag+, the obtained colloids are more oblate and assembled together to give larger aggregates.
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