本實驗利用二氧化鈦的半導體性質,進行光催化還原反應,使磷灰石披覆在二氧化鈦表面以形成核殼結構。 實驗共分為三個部分:初期比較DH-100、UV-100和自行以溶膠凝膠法合成以銳鈦礦結構為主的二氧化鈦粉體,再將二氧化鈦粉體浸漬在含較高磷酸鈣鹽濃度的模擬體液中,浸漬1日並保持溫度在37℃,並以波長365nm的紫外光照射,之後再改變實驗時的溶液pH值、反應時間、觸媒比例及環境溫度,進行光催化反應,探討變數與披覆效果的關係,並以XRD、FTIR、SEM及EDS觀察及分析核殼層表面結構及組成。 在最佳實驗條件下所得到的磷灰石二氧化鈦結構,粒徑大小約為108nm。
The photocatalyic property of titania powder has been investigated.The photocatalytic reaction is based on the semiconductor characteristic of TiO2 to reduce the apatite onto the surface of titania forming the apatite-TiO2 with core-shell structure. The procedures were divided into three parts.Initially we compared the photocatalytic activity of the commercial TiO2 powders.DH-100 and UV-100 with that synthesized by ourselves using sol-gel method.The major phase of titania is anatase. TiO2 powder were soaked in a pseudo- body solution containing phosphate ions in excess for 1 day at 37℃.The influences of the pH value, reaction time, catalyst amount and temperature on the coating were also explored afterward.The surface structure and composition were characterized by XRD, FTIR, SEM and EDS. Under optimum conditions,the particle size is probably 108nm.