Abstract
Hydrogen was produced by ultraviolet (UV) light irradiation (>200nm) in an Na2S aqueous solution without photocatalysts. Water (protons) appeared to be directly reduced to hydrogen by excited electrons produced in photon absorption with sulfide ions (S2−). The maximum quantum efficiency for hydrogen formation, 8.9%, was obtained in a 25mmoldm−3 Na2S solution. Marked amounts of hydrogen were produced under UV light irradiation in the aqueous solutions of SO32− and S2O42− ions. S2− ion absorption began at 290nm, SO32− at 275nm, and S2O42− at 400nm. Hydrogen hardly formed at all, however, in SO42−, I−, and SCN− solutions.
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Schedule a callMore From: Journal of Photochemistry and Photobiology A: Chemistry
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