Doping TiO2 by Cr from tannery wastewater for improving its activity under visible light in the dye degradation

محورهای موضوعی : Iranian Journal of Catalysis

Endang Wahyuni ¹ , Sri Wahyuni ² , Mandrea Nora ³ , Novianti Lestari ⁴ , Suherman Suherman ⁵

1 - Chemistry Department, Faculty of Mathematics and Natural Sciences, Yogyakarta, Universitas Gadjah Mada Sekip Utara POB Bls 21, Yogyakarta, Indonesia, 55284
2 - Chemistry Department, Faculty of Mathematics and Natural Sciences, Yogyakarta, Universitas Gadjah Mada Sekip Utara POB Bls 21, Yogyakarta, Indonesia, 55284
3 - Chemistry Department, Faculty of Mathematics and Natural Sciences, Yogyakarta, Universitas Gadjah Mada Sekip Utara POB Bls 21, Yogyakarta, Indonesia, 55284
4 - Chemistry Department, Faculty of Mathematics and Natural Sciences, Yogyakarta, Universitas Gadjah Mada Sekip Utara POB Bls 21, Yogyakarta, Indonesia, 55284
5 - Chemistry Department, Faculty of Mathematics and Natural Sciences, Yogyakarta, Universitas Gadjah Mada Sekip Utara POB Bls 21, Yogyakarta, Indonesia, 55284

تاریخ دریافت : 1401/09/09 تاریخ پذیرش : 1402/02/22 تاریخ انتشار : 1402/04/10

کلید واژه: TiO2, Cr, doping, Photodegradation, Congo red dye, Tannery wastewater,

چکیده مقاله :

This paper deals with the comparison of the Cr (III) dopant from tannery wastewater to the Cr (III) from the pure salt solution on the character and activity of TiO2. The doping was conducted by hydrothermal method, and the Cr-doped TiO2 prepared was characterized by UV specular reflectance (SRUV), X-ray diffraction (XRD), and X-ray fluorescence instruments. The effect of the Cr (III) doping on the activity of the TiO2 was evaluated by Congo red photodegradation. The research results reveal that Cr (III) doping on TiO2 has been successfully reducing remarkably the band gap energy (Eg) from 3.13 eV to 2.64 eV, shifting into the visible region, and further noticeably improving TiO2 activity. The effect of the Cr (III) doping from the wastewater is found to be slightly higher than that of the salt solution. The highest degradation of 10 mg/L Congo red in 50 mL solution, can be reached by applying 30 mg of the photocatalyst in 60 mins and at pH 7.

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