Preparation of Iron-Doped SiO2/TiO2 Using Silica from Sugarcane Bagasse Ash for Visible Light Degradation of Congo Red

https://doi.org/10.22146/ijc.69501

Nawwal Hikmah(1), Dewi Agustiningsih(2), Nuryono Nuryono(3), Eko Sri Kunarti(4*)

(1) Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, PO BOX BLS 21, Yogyakarta 55281, Indonesia
(2) Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, PO BOX BLS 21, Yogyakarta 55281, Indonesia
(3) Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, PO BOX BLS 21, Yogyakarta 55281, Indonesia
(4) Department of Chemistry, Faculty Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, PO BOX BLS 21, Yogyakarta 55281, Indonesia
(*) Corresponding Author

Abstract


Iron(III)-doped SiO2/TiO2 composite (SiO2/TiO2-Fe) has been prepared from sugarcane bagasse ash for photocatalytic degradation of Congo Red. This research was initiated by preparing SiO2 from sugarcane bagasse ash through a sol-gel method. The SiO2/TiO2-Fe was obtained by mixing SiO2 gel with TiO2-Fe sol which was produced with titanium tetraisopropoxide (TTIP) as precursor and FeCl3·H2O as the dopant source. Dopant concentration was varied by 0, 1, 3, 5, 7% (w/w). The prepared materials were characterized by FT-IR, XRD, SR-UV, XRF, SAA, and SEM-EDX. The photocatalytic activity was evaluated for Congo Red degradation in a closed reactor under visible light illumination. The degradation yield was determined by the UV-Visible spectrophotometry method. Results showed that SiO2 was successfully extracted from bagasse ash with a silica content of 90.87%. The SiO2/TiO2-Fe composite was successfully prepared with the bandgap energy value (Eg) decreasing as the dopant concentration increased. The optimum Eg of 2.63 eV was obtained at the concentration of Fe was 5%. Under that condition, the SiO2/TiO2-Fe photocatalyst degraded Congo Red solution by 98.18 % under visible light at pH 3 with a mass of 30 mg for 90 min. The SiO2/TiO2-Fe composite is expected to be a photocatalyst material candidate for dye wastewater treatment.


Keywords


sugarcane bagasse ash; SiO2/TiO2-Fe; photocatalyst; Congo Red; degradation

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References

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DOI: https://doi.org/10.22146/ijc.69501

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