| 초록 |
Nowadays carbon-coated TiO2 is attracting material for the improvement of photocatalytic acitiviy due to its high adsorbability and crystallinity of antase type TiO2. In this work, the carbon-coated TiO2, was prepared from following ways i) a powder mixture of TiO2 (P-25, Degussa) with polymers and ii) directly preparation from hydrolysis of titanium tetraisopropoxide (TTIP) with an aqueous solution of polymers under 500℃ to 900℃ temperature. The amount of carbon contents on TiO2 particles was controlled by changing the ratio and concentration of polymers. The transformations of rutile from anatase was suppressed up to 800℃ with a carbon contents above 5%, meanwhile the phase transformation of anatase to rutile was observed at above 600℃ in the case of parent TiO2. The adsorption studies of two commercial dyes (methylene blue and black5) indicated that carbon-coated TiO2 has a high adsorption capacity compared to that of P-25. In addition, photodecomposition of reactive dyes on carbon-coated TiO2 was highly dependent on carbon contents, particle size and heating temperature. |
