Synthesis and Characterization of Ti02/Zn0 Semiconductor Composites as Photocatalyst Materials

• Main Author: Sigit Cahyono, Aviv
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/38760
• Institution: Institut Teknologi Bandung

Ti02 and ZnO are metal oxide semiconductors and they are known to have many application such as in electronic, optical devices and photocatalyst materials. ln this research, the synthesis of semiconductor of Ti02/Zn0 composites through solid phase reaction with the variation of mass composition of Ti02/Zn0, namely I :3, I: I , and 3: I was conducted. An attempt to increase photocatalytic activity was carried out by preparing heterojunction of 2 n­ type semiconductors. Ti02/Zn0 semiconductors composites were prepared by the ball milling method. The characterization of Ti02/Zn0 composites semiconductors includes Thermo Gravimetry Analysis (TGA), X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy (DRS) and Photoluminescence (PL). The result of the thermal analysis characterization with Thermo Gravimetry Analysis (TGA) showed that mass of Ti02, ZnO, and Ti02/Zn0 composites at 500 °C did not decrease and stay stable. The value of29 X-ray diffraction of Ti/ZnO composite was obtained at 25.3° for Ti02 and 31.79°, 34.41°, and 36.28° for ZnO. This shows that Ti02/Zn0 crystals grow axially in these composites. The photocatalyst test was carried out usi ng two types of dyes namely methylene blue (MB, C16H 1sN3SCI, pKa = 3.8) and rhodamin B (RhB, C2sH3 1CIN203,pKa = 3.6) under UV light. The best photocatalytic performance was shown by Ti02 to degrade methylene blue (k = 0.0297 minute-') and rhodamin B (k = 0.0191 minute-'). While the better result was shown by TZ13 I 0 composite photocatalyst to degrade rhodamin B (k = 0.0135 minutes•' compared to ZnO degrade rhodarnin B (k = 0.0122 minutes-').