چكيده به لاتين
Abstract:
Ceramic membranes were obtained by deposition and calcination of SiO2-B2O3-TiO2 sol on α-Alumina substrate via spin coating method. Initially, single axis pressing of α-alumina was used to prepare macro porous substrates which were later sintered at 1300 °C for an hour with the heating rate of 5°C/min. The samples were characterized by three-point bending flexural test, mercury Porosimetery and SEM.
In order to guarantee photocatalytic properties, sols with different amounts of TiO2, a promising photo catalyst, were prepared for further coating. After calcination at 900°C, XRD, FTIR, DRS, BET and SEM characterizations were carried out.
Phase analysis results showed that in spite of 900°C calcination, anatase remained as the only main crystalline phase and anatase to rutile phase transition, as thermodynamically predicted, did not occur.
By increasing the amount of B2O3 in composition, anatase crystallite size was grown; accordingly the crystallinity of the system was increased.
Glass containing 10% B2O3, was considered to be most efficient mesoporous film with 2-9 nm pore distribution. Photocatalytic efficiency of final membrane was determined by calculating the degradation of 20 g/L methyl orange solution which reported to be 72.3% after 2 hours illumination.
Keywords: Membrane, Mesoporous, Sol-gel, Photo catalysis, Anatase, degradation, Methyl Orange
