Clay aerogel has extremely low density, high specific surface areas, and high degree of porosity and also can be produced by using freeze-drying process that is easy and green method. Therefore, it can use in adsorbent application. However, drawback of clay aerogel is fragile, mechanical properties of clay aerogel should be improved by mixing with polymer. Sericin, sericin-g-PLA, and poly(acrylic acid), PAA, are chosen as incorporated polymer that can improve mechanical properties of clay aerogel and also enhance clay aerogel as reactive adsorbent, called sericin clay aerogel. In this research, sericin clay aerogel was used as cigarette filter tip to adsorb nicotine and tar from mainstream smoke. The types of sericin clay aerogel were varied by mixing sericin (3 %w/v), sericin/PAA (2/3 and 3/2 %w/v), sericin-g-PLA (3 %w/v), sericin-g-PLA/PAA (2/3 and 3/2 %w/v), with clay constant 5 %w/v, and they were coated by PLA for 1 hour to find the appropriate type that could greatly adsorb nicotine and tar. Fourier Transform Infrared Spectra (FT-IR) result of sericin-g-PLA showed the characteristic peak of successfully grafted PLA onto sericin. Sericin clay aerogel was characterized by universal testing machine (UTM) and dynamic mechanical analysis (DMA) in compression mode to measure the mechanical properties, surface area analyzer (SAA) to measure the surface area, gas chromatography (GC) to measure the nicotine and tar adsorption efficiency, thermo gravimetric-differential thermal analyzer (TG-DTA) to investigate the thermal stability, and scanning electron microscopy (SEM) to investigate the morphology.