自製與市售二氧化鈦光觸媒對亞甲基藍水溶液光催化反應之研究

Study on the Treatment of Methylene Blue in Aqueous Solution Via self-made and Commercial TiO2 Photocatalysts

本研究利用自製與市售的二氧化鈦光觸媒對亞甲基藍水容液進行光催化反應，探討不同照射光源、觸媒添加量、濃度物濃度及起始pH值對光催化反映的影響，並以XRD、BET及SEM等觸媒鑑定方法確認自製二氧化鈦光觸媒晶相與觸媒粒徑。

This study we used self-made and commercial TiO2 catalyst to investigate the photocatalytic oxidation of methylene blue (MB) by reaction conditions like the light source, catalyst loading, initial concentration of MB and initial pH. This paper also examined the crystalline phase and diameter of catalysts via the characterization of catalysts of XRD、EET and SEM. For the physical test of photocatalyst, we found both self-made and commercial Merck TiO2 catalyst result an apparently and centrally linear laser beam, may show these catalysts with small diameter and perform better in photocatalytic oxidation. The experimental result indicated these catalysts enables over 95% color removal after 6h of reaction in 10 ppm MB solution under the light source of 365nm with 0.75g/L of catalyst loading. The efficacies of photocatalytic oxidation of MB increased with catalysts loading, but no significant increase when catalysts loading over 0.5g/L. The color removal after 6h of reaction decreased as initial MB concentration increased. As for initial concentration of MB, self-made TiO2 was superior to Merck at the MB solutions of 20 ppm、30 ppm and 40 ppm. For initial pH, it was found that the order of efficiency of Merck was pH10＞pH6＞pH3, while the efficiency of self-made was pH6＞pH10＞pH3, which indicated both catalysts are favorable in non-acidic solutions.