二氧化鈦光觸媒之製備及其對鉛與銅回收之成效研究

Preparation of TiO2 Catalysts and Recovery of Lead and Copper

莊麗津(Li-Chin Chuang) ； 張詠禎(Yung-Chen Chang) ； 陳煇壟(Hui-Lung Chen) ； 戴德林(Te-Lin Tai)

《弘光學報》 54期 (2008/12) Pp. 159-169

https://doi.org/10.6615/HAR.200812.54.13

摘要

二氧化鈦(TiO_2)光觸媒採用改良式熱水解法製備，於反應過程中分別加入NH_4OH、CuSO_4、FeSO_4或H_2SO_4等鹽類催化劑，以促進其均相沈澱。所製備之TiO_2粉末，比表面積範圍為160.1~202.7m^2/g，光觸媒晶型為純的金紅石結構。光催化還原重金屬Pb之成效優於對Cu之回收成效。其中以添加H_2SO_4所製備之TiO_2具有最佳之光催化還原成效，對初始濃度為150ppm之Pb於1小時內可達100%之回收率。本製備是經由低溫(50˚C)、均相之沉澱程序，製備過程完全於水中進行，不添加乙醇，製備方法比溶膠凝膠法更為簡單且低成本，因此更具有經濟效益。

關鍵字

光觸媒 ； 二氧化鈦 ； 熱水解法 ； 回收

並列摘要

Pure TiO_2 nanopowders were prepared by thermal hydrolysis method, diluting the aqueous titanylchloride with distilled water or ammonia water or an aqueous solution of sulfate ions such as CuSO_4, FeSO_4 and H_2SO_4 to improve the precipitation of TiO_2 by a homogenous process. The BET surface area of the prepared TiO_2 particles was 176~203 m^2/g. The structure of the crystallized catalysts was a pure rutile structure. All of the catalysts prepared were associated with higher photocatalytic reduction efficiency of Pb than Cu. The catalyst that was prepared by adding H_2SO_4 was responsible for the most photocatalytic reduction efficient of Pb , recovery of 100% of original Pb-EDTA (150 ppm) in 1 h, is observed. The method for preparing nanosized titania powder by a homogeneous precipitation process in H_2O without extra addition of ethyl alcohol at low temperatures (50˚C) is simpler and lower in cost than sol-gel method. The method of preparing titanium dioxide powder is very simple and therefore very economically favored.

並列關鍵字

Photocatalyst ； TiO_2 ； Thermal hydrolysis ； Recovery

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