Geopolymer Building Materials Based on Fly Ash in Terms of Removing SO₂, CO₂, and Water Vapor

This paper presents the results of sorption tests against selected gaseous pollutants SO2, CO2 and H2O on geopolymer materials obtained from high-calcium fly ash from lignite power generation. In the synthesis process, activation of geopolymer materials was carried out using KOH and NaOH. It was found that the activating agent significantly affects the porous structure of the samples. The sorption experiments conducted for the KOH-activated sample showed high SO2 adsorption efficiency, almost ten times higher than against CO2. The results demonstrate the possibility of utilizing fly ash obtained from the lignite energy processing sector for the synthesis of geopolymers with potential application of the materials as functional plastering compounds.