本研究針對TiO2光觸媒進行性質上的改良。本研究目的有二: 首先，以溶膠-凝膠法製備二氧化鈦及磷灰石。其次，利用紫外光照射二氧化鈦可產生強力氧化作用，以及磷灰石與二氧化鈦相容性佳，磷灰石對有機物可吸附之特性將二者結合，以乙酸為反應物，使用不同比例二氧化鈦/磷灰石所合成之觸媒，由乙酸去除率篩選最適之TiO2/Apatiet光觸媒及最適之觸媒添加量。
從XRD分析得知，利用TiCl4無機金屬鹽類製備之二氧化鈦為銳鈦礦相，但前處理溶液中的氯離子含量會影響二氧化鈦粉末粒徑與比表面積。另外，從BET分析發現添加適量的聚丙烯可以增加磷灰石的比表面積，最適之磷灰石/聚丙烯比例為1:1。由COD實驗結果得知，TiO2/Apatiet光觸媒在二氧化鈦/磷灰石合成比例為1:1時反應效果為最佳，而最適觸媒添加量為0.75g/L。
在常溫下，使用最適觸媒及最適添加量，200ppm乙酸，反應3小時COD去除率可達41.6%。 This study aimed at the improvement of TiO2 photocatalyst. There are two objectives in this work: First, via sol-gel method, the TiO2 and apatite were synthesized respectively. Second, considering the great oxidation capability of TiO2 and the great organics adsorption capacity of apatite, the TiO2 and apatite were blended to have the best of both worlds. Note that TiO2 and apatite are compatible. The acetic acid was choosen as the reactant because it is a refractory organic and is stable even under the irradiation of UV ray. TiO2/apatite catalysts with various ratios were prepared and investigated. It is for screening for the optimum ratio of TiO2/apatite. Besides, the optimum catalyst loading was also determined.
According to XRD spectra analysis, the TiO2 prepared by using TiCl4 is predominantly the anatase phase. It was found that amount of residual Cl- would affect powder size and specific surface area of TiO2. Alternatively, adding appropriate amount of polypropylene (PP) could increase specific surface area of apatite. The optimum apatite/PP ratio is 1:1. In addition, results of acetic acid reaction showed that the optimum ratio of TiO2/apatite is 1:1, whilst the optimum catalyst loading is 0.75g/L. Under the most efficient condition, the COD removal of 200 ppm acetic acid solution could attain 41.6% after 3hrs reaction.
