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Photocatalytic Degradation of a Congo red Using ZnO/rutile-<TEX>$TiO_2$</TEX>, ZnO, rutile-<TEX>$TiO_2$</TEX> and CdS
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.3, pp.259-265
Kim,
C. S., &
Ryu,
H.
(2001). Photocatalytic Degradation of a Congo red Using ZnO/rutile-<TEX>$TiO_2$</TEX>, ZnO, rutile-<TEX>$TiO_2$</TEX> and CdS. Analytical Science and Technology, 14(3), 259-265.
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Abstract
Photocatalytic degradation of Congo red was performed using various semiconductors as ZnO, CdS, rutile-<TEX>$TiO_2$</TEX> or mixed rutile-<TEX>$TiO_2$</TEX>/ZnO. The change of degradation of the dye was investigated by UV-visible spectrophotometric method. The photocatalytic action of CdS was greater than ZnO and rutile-<TEX>$TiO_2$</TEX> in account of low band gap energy of CdS. The rate of photocatalytic degradation reaction increased drastically in according to increasing ratio of ZnO on mixed rutile-<TEX>$TiO_2$</TEX>/ZnO. These photocatalytic effect of rutile-<TEX>$TiO_2$</TEX> was suppressed by more stable rutile-<TEX>$TiO_2$</TEX>, doping the hydrolysis product with <TEX>$Zn^{2+}$</TEX> prior to calcination onto the rutile-<TEX>$TiO_2$</TEX> surface.
- keywords
- photocatalytic, Congo red, semiconductro, absorbance
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