Geoploymers are produced by alkali activation of aluminosilicates such as metakaolin, fly ash and slug etc. Alkali ions provide the charge balance associated with the AlO4- tetrahedral unit. It is known that alkali ion can be exchanged by other ions apart from alkali ions such as NH4+, Ca2+, Ba2+, Sr2+, Pb+, Ag+ etc. By using this ion exchange property of the geopolymers, various materials can be synthesised such as mullite, anorthite, celsian, etc. upon calcination. This study aims to develop an antibacterial material. For this, metakaolin based geopolymer was doped with silver by ion exchange process. The doped geopolymer was calcined at different temperatures up to 1050 oC. Release of silver ions from the calcined samples into water was determined by atomic absorption spectroscopy. The effect of calcination temperature on the phase development of the exchanged geopolymer and on the release of silver ion into water will be reported.