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Radiolytic splitting of water molecules in the presence of some supramolecular compounds

Cecal Aleksandru (Faculty of Chemistry, 'Al. I. Cuza' University, 11, B-dul Carol I, 6600 Iasi, Romania)
Paraschivescu Andrei (Faculty of Chemistry, 'Al. I. Cuza' University, 11, B-dul Carol I, 6600 Iasi, Romania)
Popa Karin (Faculty of Chemistry, 'Al. I. Cuza' University, 11, B-dul Carol I, 6600 Iasi, Romania)
Colisnic Dan (Faculty of Chemistry, 'Al. I. Cuza' University, 11, B-dul Carol I, 6600 Iasi, Romania)
Timco Grigore (Institute of Chemistry, Academy of Science, Kishinew, Republic of Moldova)
Singenerean Lidia (Institute of Chemistry, Academy of Science, Kishinew, Republic of Moldova)

This paper deals with the study of the hydrogen output during the catalyzed radiolysis of water in the presence of the supramolecular compounds Fe2NiO(TMAc)6.3HTMAc, FeCoO (TMAc)6. 3HTMAc, [Cr3O(C6H5COO)6]· ClO4 Fe3Ni2O(OH)(TMAc)7(Aacet)3, Ni2(H2O) (TMAc)4(HTMAc)4 [Cr3O(TMAc).3H2O](TMAc), and Cr8F8(TMAc)16. A60Co γ-source of 5.1x1014 Bq activity at a rate dose of 8.038 kGy h-1 was used. The radiolysis products were determined by mass spectrometry. For a given irradiation time, it was found that quantity of hydrogen obtained by water radiolysis is 6 – 18 times greater in the presence of the supramolecular compounds as catalysts than in their absence from the irradiated system.

Keywords: hydrogen evolution, radiolysis, supramolecular catalysts, radioactive waste.