Application of Titanium-Silica-Graphite Composite Material for Photocatalytic Process of Methylene Blue

Lia Destiarti; Risya Sasri

doi:10.22146/ijc.48998

Application of Titanium-Silica-Graphite Composite Material for Photocatalytic Process of Methylene Blue

https://doi.org/10.22146/ijc.48998

Lia Destiarti^(1*), Risya Sasri⁽²⁾

(1) Department of Chemistry, Universitas Tanjungpura, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78114, West Kalimantan, Indonesia
(2) Department of Chemistry, Universitas Tanjungpura, Jl. Prof. Dr. Hadari Nawawi, Pontianak 78114, West Kalimantan, Indonesia
(*) Corresponding Author

Abstract

The use of TiO₂ in the slurry system for the photocatalytic process has disadvantages. It causes the resistance of UV transmission because it is cloudy and the difficulty for obtaining the catalyst at the end of the process. Therefore, an attempt to overcome this was conducted by compositing TiO₂ on SiO₂. Furthermore, carbon material can be used as a support material for TiO₂-SiO₂, so that the mixed materials can be used as a photocatalyst. The methods for synthesis the material was a sol-gel method by varying the composition of TiO₂-SiO₂/graphite, which was 1:1; 1:2; and 2:1. The material obtained was characterized by FTIR, DRUV, XRD, and SEM. Photocatalytic activity of the synthesized material was tested in methylene blue solution whereas the quantitative data derived from UV-Vis spectrometry measurement. Photocatalyst activity was carried out by varying the degradation time of 30–180 min. The FTIR spectrum showed that O-H (~3400 cm^–1) and C-O (~1100 cm^–1) are the major groups in the synthesized materials. The value of bandgap energy (E_g) were 4.15, 4.20, 5.22, and 5.19 eV for TiO₂-SiO₂, TiO₂-SiO₂/G (1:1; 1:2; and 2:1) composites, respectively. The XRD pattern of TiO₂-SiO₂ showed that the highest peaks of 2q were observed at 25.32, 37.71 and 47.91°. Graphite identity appeared at 2q = 59.87°. Micrograph of SEM showed a homogenous dispersion of spherical particles in the materials. Photocatalytic test results showed that TiO₂-SiO₂/G with a composition of 2:1 has the highest percentage of methylene blue degradation, which reached 94% at 180 min.

Keywords

titanium dioxide; silica; graphite; photocatalytic; methylene blue

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DOI: https://doi.org/10.22146/ijc.48998