Photocatalytic degradation of 4-chlorophenol using prepared TiO_2 catalysts

應用製備之二氧化鈦觸媒光催化降解4-氯酚

莊麗津(Li-Chin Chuang) ； 張蕙嵐(Hui-Lan Chang) ； 黃星瑋(Sing-Wei Huang)

《弘光學報》 60期 (2010/09) Pp. 61-73

https://doi.org/10.6615/HAR.201009.60.06

摘要

以製備二氧化鈦觸媒光催化降解4-氯酚。純二氧化鈦粉末以改良式熱水解法，於製備過程中添加硫酸鹽或氨水以促進其均相沉澱。使用高效液相層析法(HPLC)持續測量4-氯酚濃度。所製備之觸媒為純的金紅石結構，粒徑大小35-50奈米。於過程中添加NH_4OH及H_2SO_4所製備之二氧化鈦，對4-氯酚具有較佳之降解效率，其中以添加NH_4OH所製備之二氧化鈦與市售之P-25和ST-21有相當之光催化活性：於6小時內可降解初始4-氯酚濃度達85％；於11小時內可降解達97％。本方法除了簡單並提高對4-氯酚之降解效率外，亦減輕了揮發性有機物所造成之問題。

關鍵字

光催化 ； 降解 ； 二氧化鈦 ； 4-氯酚

並列摘要

This paper describes the photocatalytic degradation of 4-chlorophenol using titanium dioxide (TiO_2) catalysts prepared in our laboratory. Pure TiO_2 powders were prepared using a modified thermal hydrolysis method involving the addition of either sulfate or aqueous ammonia to enhance the spontaneous precipitation of TiO_2. The continuous measurement of degrading 4-chlorophenol was made using a high performance liquid chromatographic method. The structure of the crystallized catalysts was a pure rutile structure and the particle size was 35-50 nm. The TiO_2 catalyst prepared using NH_4OH or H_2SO_4 exhibited the superior efficiency at degrading 4-chlorophenol to that prepared following the addition of distilled water. The catalyst prepared by adding NH_4OH shows similar efficiency to that of commercial catalysts, P-25 and ST-21, removing of 85% of original 4-chlorophenol within 6 h and 97% of it within 11 h. In addition to their simplicity and improved efficiency at degrading 4-chlorophenol, the method also alleviate the volatile organic problem commonly associated with this product.

並列關鍵字

Photocatalytic ； degradation ； titanium dioxide ； 4-chlorophenol

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