研究目的
Developing new routes to prepare effective, durable and high-temperature stable anatase-based photocatalytic ceramic.
研究成果
A crystallization method has been developed for the preparation of anatase based glass-ceramic glaze. 700 oC is the optimal temperature for the crystallization of anatase. HF etching makes more anatase grains exposed on the surface. The sample etched for 45 s shows the highest photocatalytic activity and the MO is decomposed by ~ 90% after illumination for 35 h. This glaze has good fitness with the ceramic bodies.
研究不足
The degradation activities of these glaze samples are weaker not only than powder samples, but also weaker than the coatings, due to the relatively small surface area of anatase.
1：Experimental Design and Method Selection:
A crystallization method for the preparation of anatase-based glass-ceramic glaze was developed. The raw materials were made into frit and glazed on ceramic bodies. The glazed ceramics were sintered at 1180oC and soaked at 700oC.
2：Sample Selection and Data Sources:
Green ceramic tile bodies mainly composed of clay, feldspar and quartz were used as received and precalcined at 800 oC in advance.
3：List of Experimental Equipment and Materials:
Analytically pure chemicals including SiO2, TiO2, H3BO3, Na2CO3, K2CO3, Al(OH)3, (MgCO3)4·Mg(OH)2·5H2O, Na3PO4·12H2O and Na2SiF6 were used as received.
4：Experimental Procedures and Operational Workflow:
The mixture was melted with an alumina crucible in an electric furnace for
5：5 h at 1450 °C. The melt was quenched in water to obtain a glassy frit. The glazed bodies were initially sintered at 1180 °C for 20 min, then rapidly cooled with air to a certain temperature between 600-800 oC, soaked for 30 min and finally cooled to room temperature. Data Analysis Methods:
The photocatalytic property of the glazed tiles was evaluated by degradation of methyl orange.
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