Synthesis and adsorption properties of titanosilicates ETS-4 and ETS-10 from fly ash

► Titanosilicates (ETS-4 and ETS-10) have been synthesized from waste fly ash. ► These materials showed similar properties to those prepared from traditional starting materials. ► The supernatant liquid after product formation (ETS-4) can be recycled and the final by-product is NaCl. ► These materials can be used for CO2/CH4 and N2 adsorption.