Preparation of Calcium Zirconate- Silica nanocomposite and consideration of thermal, electrical and photocatalytic properties

摘要

In this research calcium zirconate- silica nanocomposite was synthesized and it's thermal, electrical and the photocatalytic properties were evaluated. For preparation of CaZrO_3/SiO_2, nano powder was synthesized by sol- gel method and was calcined at 700-1000°C. Next nanocomposite was synthesized by adding processing nano silica. The resulting nanocomposite and nano powder were characterized by XRD, FT-IR, SEM techniques. The results showed that by increasing the calcium zirconate phase to the silica matrix, thermal expansion decreases from 15.96×10~(-6) to 10.26×10~(-6) 1/°C. Also the dielectric constant increased from 3.9 for pure silica to 5.6 for nanocomposite CZS20. Photocatalytic activity of nanocomposite CZS20 by dye degradation of methylene blue under UV light was improved from 80% to 95% at room temperature.