Presentation Information
[8a-P04-6]Low-Temperature Green Synthesis of Sand-Derived Silica and Its Composites Toward Industrial Dye Removal Applications
Chaity Ghosh1, 〇(PC)Abdul A Kuddus2, Shinichiro Mouri2, Abu Bakar Md. Ismail1 (1.Univ. of Rajshahi, 2.Ritsumeikan Univ.)
Keywords:
Silica,River sand,Dye removal
Silica nanoparticles (SiO2 NPs) are promising adsorbents for wastewater treatment due to their high surface area, tunable porosity, and chemical stability. This study introduces a green, low-cost method to synthesize SiO2 NPs from Padma River sand in Bangladesh using microwave-assisted processing. The sand was purified, alkali-fused with sodium hydroxide (NaOH) at 250 degrees Celsius, acidified to pH around 10, and further heated at 400 degrees Celsius to form silica gel, which was then calcined and milled into fine nanoparticles. The resulting SiO2 NPs showed approximately 84 percent removal efficiency of methylene blue (MB) dye from a 50 ppm solution under UV exposure, using 60 mg of adsorbent within 30 minutes. This approach demonstrates the potential of sand-derived silica and its composites for efficient dye removal, supporting green chemistry and environmental sustainability.