二氧化鈦具有能隙大且無自溶性而廣為業界所使用，不論對水和空氣中有毒物質去除污水之純化、環境臭氧、CO2之固定氟氯碳化物之分解等都佔有極大之重要性，而隨著環保意識高漲，越來越多之研究也指向二氧化鈦，但是二氧化鈦卻有著低比表面積及熱穩定不佳之缺點，使得其在發展上大大打了折扣，如何改善其缺點則為現今專家學者研究的重點之ㄧ。
本研究利用溶膠凝膠法製備二氧化鈦-活性碳之複合粉末，由於活性碳具有高比表面積及多孔性質之優點，藉由異質成核機制，不僅可以降低二氧化鈦晶粒大小並提高其活性，且利用複合粉末也可達到改善二氧化鈦低比表面積及熱穩定性不佳之缺點。
將所得之複合粉末利用XRD、SEM等儀器推測其核為活性碳，微小之二氧化鈦粒子披覆其上，並且利用TEM等照片驗證確定二氧化鈦-活性碳複合粉末，藉由FTIR確認二氧化鈦與活性碳接合之情形，在光催化測試方面，複合粉末具有超越純二氧化鈦之光催化效果，原因為複合粉末確實可壓抑二氧化鈦粒子之成長並提高周圍污染物濃度，因而提高二氧化鈦光催化之效能。

TiO2 photocatalysts has attracted a great deal of attention with the increasing number of recent environmental problems in the world, especially for the detoxification of water and air. TiO2 must overcome the faults related to the low surface area of TiO2, it could be solven by modifying TiO2 on activated carbon surface.
In this study, activated carbon is regarded as substrate, and TiO2 sols was loaded on it, which was prepared by sol-gel method using tetraisopropyl titanate as precursor to mount thin TiO2 film on activated carbon by heterogeneous growth.
The TiO2-mounted activated carbon powder is characterizes by XRD、SEM for assuming that activated carbon is regarded as substrate and TiO2 is dispersed on it, and prove that have Ti-O-C chemical bonding by TEM、FTIR. The powder was employed as catalysts for photocatalytic test that was conducted on methylene blue,CO2 and bacteria reduction. The composite powder is observed by TEM that the crystallite size of TiO2 is smaller than bare TiO2(15nm and 24nm in 600℃) and this result is also proved by XRD calculation. Furthermore, The composite powder was shown higher photoactivity for the three photocatalytic test under UV irradiation. Compared to bare TiO2 prepared in parallel,it is attributed to the activated carbon large surface area and TiO2 dispersed on it as well as diminish anatase crystallite size.

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