Date: March 22nd 2019 (Friday)
Time: 11:30 AM
Venue: Committee Room (MS710), Chemistry Department, 6th Floor
Abstract: Coal combusting power plants are simultaneously among the main emitters of carbon dioxide and the main generator of solid by-products, such as fly ash (FA). An attempt to find a common solution for these environmental problems is reported. Zeolites analcime and faujasite (X) have been successfully synthesized by interaction of FA, originating from lignite coal at Maritsa Iztok 2 thermal power plant with sodium hydroxide, followed by hydrothermal treatment. NaX zeolite crystallisation started later by decreasing NaOH amount. In order to optimise synthesis process a seed-assisted procedure was introduced. In this way, zeolitisation may increase cost-effectiveness and eco-efficiency. Synthesized zeolites were used in environmental protection processes. Zeolite X was used in CO2 adsorption and VOCs oxidation, while analcime in purification of phenol contaminated water. Determination of adsorption capacity towards CO2 was measured to be 60 mg g-1 and the adsorption-desorption equilibrium was reached after one hour. The adsorption capacity towards phenol was measured to be 14 mg g-1adsorbent.