Synthesis Composite of Semiconductor TiO2 anatase/M2SnO4 (M = Mg, Zn) as Photocatalyst Materials

• Main Author: Niza El Aisnada - Nim: 10514050 , An
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25691
• Institution: Institut Teknologi Bandung

<p align="justify">Metal oxide semiconductors can be applied as photocatalys material. The enhancement of photocatalytic efectivity by preventing electron-hole recombination using a heterojjunction between two metal oxide semiconductor is the aim of this research. Metal oxide semiconductor of TiO2, Mg2SnO4 and Zn2SnO4 were succesfully synthesized by means of sonochemical method revealed by Xray Diffraction (XRD), Diffuse Reflectant Spectroscopy (DRS), and Photoluminesence Spectroscopy (PL) characterization. However, additional SnO2 phase was detected in Zn2SnO4. Furthermore, composite of TiO2/M2SnO4 (X = Mg, Zn) were synthesized by solid state reaction at 500 oC with variation of calcination time. Photocatalytic activity was examined using two kind of dyes, Methylene Blue (MB, C16H18N3SCl, pKa 3,8) and Methyl Red (MR, C15H15N3O2, pKa 5,1) under UV radiation (350 nm). Futhermore, photocatalytic activity was evaluated using first order rate constant and obtained different k value for activity of the same compound to MB and MR degradation. In addition, the highest k value was shown by TiO2 for MB degradation at 0,055 minute–1 and for MB degradation at 0,034 minute–1. Interestingly, formation of heterojunction between two bulk semiconductors apparently create different problem for electron-hole mobilization between photocatalyst. <p align="justify">