Photocatalytic H2 evolution from NaCl saltwater over ZnS1-x-0.5yOx(OH)y-ZnO under visible light irradiation
2011
Photocatalytic hydrogen production was investigated over ZnS1 x 0.5yOx(OH)yeZnO using
sulfide ion (Na2SeNa2SO3) as an electron donor from NaCl saltwater. NaCl can affect
markedly the activity for photocatalytic hydrogen production, depending on NaCl
concentration. When NaCl concentration is lower, the activity is lower than that in pure
water, whereas when NaCl concentration is higher, the activity is higher than that in pure
water. NaCl decreases not only the surface charge of ZnS1 x 0.5yOx(OH)yeZnO but also the
surface hydration. When ZnS1 x 0.5yOx(OH)yeZnO was impregnated with the electron
donor (Na2SeNa2SO3), ZnO was transformed partly into ZnS. The impregnated ZnS1 x 0.5y
Ox(OH)yeZnO exhibits higher activity than the non-impregnated one. The possible mechanisms
were discussed.
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