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A low-cost indigenous silica powder at nano-scale was synthesized by thermal combustion and alkaline extraction technique from bamboo leaf ash. The bamboo leaf ash was prepared by heating the bamboo leaf at 750°C for 5 h. The amorphous SiO 2  nanoparticle with an average particle size of 20 nm was used for the industrial application. The synthesized nanoparticle as a filler was mixed with polydimethylsiloxane (PDMS) polymer solution to synthesize a nanocomposite membrane by a solution casting method. The morphological study was done using high-resolution scanning electron microscopy (HRSEM) with an energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and the chemical structure was studied using Fourier-transform infrared spectrometry (FTIR). Thermogravimetric analysis (TGA) analyzed the thermal stability of the membranes, and the hydrophobicity was measured using contact angle analyzer. Separation of the acetic-water mixture was carried out by nano-composite PDMS membrane to study the effect of silica loading on the PDMS membrane. It was observed that the presence of SiO 2  nanoparticles significantly improves the pervaporation flux as well as the thermal stability.

Synthesis of SiO 2 nanoparticle from bamboo leaf and its incorporation in PDMS membrane to enhance its separation properties