Synthesis and Characterization of TiO2@SiO2 and SiO2@TiO2 Core-Shell Structure Using Lapindo Mud Extract via Sol-Gel Method

Core-shell structures were prepared using silica from Lapindo mud extract. The XRD results showed that the extracted silica contains γ-Al2O3 and NaAlSi3O8. Besides, the FT-IR, Raman spectroscopy, and FE-SEM analyses showed that the core particles were not finely covered by the shell. BET measurement indicated that high surface areas are attainable for core-shell structures addition into TiO2 nanoparticles. TiO2/TiO2@SiO2 core-shell structure has 161.100 m2/g and 0.311 cc/g of surface area and pore volume, respectively. Whereas, TiO2/SiO2@TiO2 core-shell structure has surface area of 140.200 m2/g and pore volume of 0.292 cc/g.