INFLUENCE OF CYANIDE ON REMOVAL OF COPPER ION FROM THE SOLUTION BY PHOTOCATALYTIC REDUCTION METHOD WITH TiO2 SUSPENSION

https://doi.org/10.22146/ijc.21477

Endang Tri Wahyuni(1*), Mudasir Mudasir(2), Tania Avia Gusman(3)

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara POB.Bls. 21 Yogyakarta 55281
(*) Corresponding Author

Abstract


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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DOI: https://doi.org/10.22146/ijc.21477

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