LAUSR

Abstract This study aims to evaluate the in-situ synthesis of zeolites through geopolymerization of biomass fly ash wastes at low temperature in a hermetic container. The raw materials were activated using a mixture of sodium silicate and sodium hydroxide, and then the specimens cured at 60 °C to obtain zeolite-containing geopolymers. Hydrogen peroxide (H2O2) was used as a porogenic agent. X-ray diffractograms showed the presence of faujasite zeolites regardless of the added H2O2 content. P zeolite was formed without porogenic agent addition, resulting in increase in the surface area (56.35 m2/g) in comparison with samples cured in room conditions (40.69 m2/g). The identified zeolites and the mechanical strength (up to ∼10 MPa) suggest applications as separation membranes or filters.