Core-shell structures were prepared using silica from Lapindo mud extract. The XRD results showed that the extracted silica contains γ-Al 2 O 3 and NaAlSi 3 O 8 . 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 TiO 2 nanoparticles. TiO 2 /TiO 2 @SiO 2 core-shell structure has 161.100 m 2 /g and 0.311 cc/g of surface area and pore volume, respectively. Whereas, TiO 2 /SiO 2 @TiO 2 core-shell structure has surface area of 140.200 m 2 /g and pore volume of 0.292 cc/g.
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