| Summary: | ABSTRACT
The removal of Cu(lI} by photoreduction method using Ti02 photocatalyst in the presence of CN" is reported.
Photoreductionwas carriedby batch technique using UV lamp with290-350nm of wavelength. The research results
indicate that the present of CN"ion gives different effects on the photoreduction effectiveness depends on the mole
ratio of both ions. The addition of CN"less than 2 moles for each mole of Cu (II) ion can improve the photoreduction, and the photoreduction sharply goes down into very low degree when the mole number of CN"is increased up to 4, and by further enlarging the mole number into 6, the photoreduction degree remains constant. Furthermore, increasing solution pH generally leads to a decrease in the photoreduction..In the solution with pH 1, the maximal photoreduction degree is reached, while increasing pH from 1 to 9 has declined the photoreduction, and the photoreduction is totally inhibited at pH higher than 9. The effect of the solution pH is related with the speciation of Cu (II), CN"and Ti02 in the solution.
Keywords: Photoreduction, copper, cyanide, Ti02photocatalyst
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