Abstract
Sodium silicate (Na2SiO3), a precursor with a low industrial material cost was successfully used to prepare silica aerogels via a sol–gel process and was coated onto a macroporous Al2O3 membrane. After hydrophobic modification, the sodium silicate-derived silica aerogel membranes were used for CO2 absorption in membrane contactors. The experimental results demonstrated that the sodium silicate-derived hydrophobic silica aerogel membranes exhibited a high CO2 absorption flux of 1.5 mmol/m2s and could be used continuously for at least 4 days. Sodium silicate-derived hydrophobic silica aerogel membranes show great potential for large-scale CO2 absorption in industrial power plants due to their low-cost and high CO2 absorption flux properties.
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