STUDY OF Cr(VI) PHOTOREDUCTION CATALYZED BY CDO-ZEOLITE

Endang Tri Wahyuni; Mudasir Mudasir; Saudur Sinambela

doi:10.22146/ijc.21923

STUDY OF Cr(VI) PHOTOREDUCTION CATALYZED BY CDO-ZEOLITE

https://doi.org/10.22146/ijc.21923

Endang Tri Wahyuni^(1*), Mudasir Mudasir⁽²⁾, Saudur Sinambela⁽³⁾

(1) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(2) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(3) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(*) Corresponding Author

Abstract

An attempt to decrease Cr(VI) ions in the solution which is more toxic than Cr(III) has performed by assisting the photoreduction of Cr(VI) ions catalysed by oxide Cd(II) supported in the zeolite pores (CdO-zeolite). The research consists of preparation, characterization, and photoactivity examination of CdO-zeolite. The preparation was carried out by ion-exchange method, which was followed by oxidation by flowing oxygen gas at 300^oC. Analysis to determine the Cd adsorbed by zeolite and characterization to determine Eg as photocatalyst character was carried out by AAS and diffuses reflectance UV-Visible spectrophotometry (DRUV-Vis) methods, respectively. Photoreduction process was carried out in a closed reactor by radiating a suspension of Cr(VI) solution and CdO-zeolite with UV lamp for period of times. The concentration of unreduced Cr(VI) in the solution was determined by UV-Visible spectrophotometer as biphenyl carbacide complex. The results of the analysis and characterization indicated that the amount of Cd in CdO-zeolite is 46,832 mg/g and Eg of CdO-zeolite (3,26 eV) is larger than Eg of CdO (2,38 eV). Photocatalytic examination showed that the photoreduction results are proportional with the Eg values,i.e the results of Cr(VI) catalyzed by CdO-zeolit are higher than that of by CdO. Photoreduction of 50 mL solution Cr(VI) 25 ppm at pH = 7 catalyzed by 50 mg CdO- zeolite for 25 hours has given maximum result of 65,89 %.

Keywords

photoreduction; zeolite

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DOI: https://doi.org/10.22146/ijc.21923