本研究使用溶膠－凝膠法來製備二氧化鈦觸媒，添加金屬與Apatite加以改質，自製出不同金屬(Mo、Fe、Ce、Cu、Ni與Zn)且不同比例(0.1、1、2.5、5 mol%)之金屬/TiO2光觸媒，再結合有強吸附能力的磷灰石(Apatite)，製成金屬/TiO2/Apatite光觸媒，在紫外光(365 nm)照射下進行酚水溶液光催化反應，並藉由分析酚轉化率與COD去除率，評估前述光觸媒對於酚水溶液之催化效能，並進行反應條件對去除效率影響之探討。
研究結果顯示，在TiO2中添加Zn(1 mol%)去除酚水溶液效果比另五種金屬效果好，在反應條件為酚100ppm、觸媒添加量0.75g/L反應六小時轉化率達到34%，COD的去除率約26%。在Zn/TiO2與Apatite結合的比例中，以Z-T/A = 7/1為最佳比例的觸媒，在酚100ppm、觸媒添加量0.5g/L反應六小時轉化率效果可達到48%，COD去除率約23%。在觸媒添加量方面，添加量越高轉化效果越佳，但就反應效能與觸媒製作成本考量，採用0.5g/L作為最適觸媒添加量。反應初始的酚濃度越高轉化效果越低。在紫外光照強度方面，每增加4支UV燈管，酚轉化率約提升7%，COD去除率約提升4%，顯示出光照強度與觸媒之催化效能間呈現正比關係。Z-T/A觸媒在酸性(pH 3)條件下光催化反應，有較高的酚轉化率。本研究製作之Z-T/A觸媒對酚有不錯之降解效果，但對乙酸與甘胺酸的催化效果則不甚理想。 In This study, we prepared several metal/TiO2 (metals：Mo、Fe、Ce、Cu、Ni and Zn) catalysts in difference ratio (0.1、1、2.5 and 5 mol%) by the sol-gel method, then synthesized apatite as metal/TiO2/Apatite catalysts for improving the efficiency of photocatalyst. By the rate of phenol conversion and the efficacy of COD removal under the UV light (365 nm) via above photocatalyst, performance of the catalysts was estimated and screened by the reactive conditions.
The results show that, adding Zn in TiO2 with 1 mol% ratio rendered the most effective performance, which effected 34% phenol (100 ppm) conversion and 26% COD removal after 6 h hours in catalyst loading of 0.75 g/L. The highest performance efficiency of 100 ppm phenol was obtained at Zn-TiO2/apatite ratio of 7:1, which achieved 48% phenol conversion and 23% COD removal after 6 hours reaction in catalyst loading of 0.5g/L. Although increasing catalyst loading gained higher conversion, but consider that efficiency and cost of catalyst preparation, the optimal catalyst loading was 0.5 g/L. The result also indicated that, the performance efficiency was getting lower while the initial phenol concentration was increasing. On UV light intensity condition, to increase 4 UV tube (with light intensity of 0.28mW/cm2), would lead an increase about 7% phenol conversion and 4% COD removal, which showed higher radiation intensity confers to higher efficiency. The Z-T/A catalyst was higher conversion on acidity (pH 3) than alkalinity. Above Z-T/A catalyst was not good efficiency to degradation acetic acid and glycine.
