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Journal > Indonesian Journal of Chemistry > INFLUENCE OF CYANIDE ON REMOVAL OF COPPER ION FROM THE SOLUTION BY PHOTOCATALYTIC REDUCTION METHOD WITH TiO2 SUSPENSION

 

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Indonesian Journal of Chemistry
Vol 10, No 1 (2010)
INFLUENCE OF CYANIDE ON REMOVAL OF COPPER ION FROM THE SOLUTION BY PHOTOCATALYTIC REDUCTION METHOD WITH TiO2 SUSPENSION
Wahyuni, Endang Tri ( Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281)
Mudasir, Mudasir ( Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281)
Gusman, Tania Avia ( Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281)
Article Info   ABSTRACT
Published date:
21 Jun 2010
 
The removal of Cu(II) by photoreduction method using TiO2 photocatalyst in the presence of CN- is reported. Photoreduction was carried by batch technique using UV lamp with 290-350 nm 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 TiO2 in the solution.   Keywords: Photoreduction, copper, cyanide, TiO2 photocatalyst
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