改質二氧化鈦光觸媒於可見光下降解水楊酸之研究

本研究使用溶膠凝膠法製備(鐵、鎳)改質及不同燒結溫度之二氧化鈦，添加過渡金屬改質使二氧化鈦具有吸收可見光的特性，鐵改質比例為(Fe-TiO2，0、0.01、0.05、0.1、0.5 wt%)，鎳改質比例為(Ni-TiO2，1、5、10、15 wt%)，燒結溫度為(400℃、500℃、600℃、700℃)。於三種不同光源，可見光燈(400-500 nm)、日光燈、太陽光，下光催化降解水楊酸之效率比較。本研究使用BET比表面積儀、XRD、FE-SEM/EDS等，鑑定金屬改質光觸媒之物化特性。由實驗結果可知，BET比表面積分析，以鐵、鎳改質二氧化鈦，不同改質比例之二氧化鈦的比表面積差異不大，約在90.12∼ 103.44 m2/g；XRD圖譜顯示以400℃燒結之二氧化鈦均為Anatase相，當燒結溫度提高至500℃開始有會有少量的Rutile相出現，但是在700 ℃燒結的樣品則是以Rutile晶相為主，金屬的改質並沒有造成晶相的轉變。於光催化降解水楊酸實驗，其結果顯示以鐵改質不同比例之二氧化鈦在三種不同光源下降解水楊酸皆以(Fe-TiO2，0.1 wt%)有較佳之光催化能力，以鎳改質不同比例之二氧化鈦在三種不同光源下降解水楊酸皆以(Ni-TiO2，10 wt%)有較佳之光催化能力，以最佳改質比例製備不不同燒結溫度之二氧化鈦於三種不同光源下降解水楊酸皆以400℃燒結之二氧化鈦有較佳之光催化能力。以三種不同光源(可見光燈、日光燈、太陽光)下降解水楊酸，皆以太陽光為光源有較佳之光催化能力。本研究之光催化實驗中，以擬一階與擬二階動力方程式進行迴歸得知，水楊酸的降解符合擬一階線性迴歸。

關鍵字

溶膠凝膠；二氧化鈦；光催化；水楊酸

並列摘要

This study using metal (Fe、Ni) modified TiO2 catalysts nano-photocatalysts were prepared by sol-gel process. This modification results in catalysts with enhanced visible light absorbance in blue light region . The Fe-TiO2 were 0、0.01、0.05、0.1、0.5 wt% respectively. The Ni-TiO2 were 1、5、10、15 wt% respectively.. The calcined at 400℃、500℃、600℃、700℃. Degradation of salicylic acid respectively under three kind of light sources the visible light lamp (400-500 nm), solar light, the daylight lamp. These catalysts were characterized by the use of Brunauer-Emmett-Teller (BET)、X-ray diffraction (XRD )and Field emission Scanning Electron Microscope (FESEM). The BET surface area test of the catalysts was 90.12 ~103.44 m2/g. The XRD results, the pure and modified TiO2 calcined at 500 ◦C Began to have a small amount of Rutile phase appears at 700 ◦C are in anatase form. Modification of metals did not cause phase transformation. The Photocatalysis Degradation of salicylic acid test received the following results. Using Ferrum to modify TiO2, the Fe-TiO2 (0.1 wt%) had the greatest photocatalytic activity. Similarly, using Nickel to modify TiO2, the Ni-TiO2 (10 wt%) had the greatest photocatalytic activity. At the best ratio of modified, preparing TiO2 in different sintered temperatures received the TiO2 which had higher photocatalytic activity at the temperature of 400 ℃. Degrade salicylic acid under the three kinds of light sources including visible light, fluorescent light, and solar light. The degradation has the best photocatalytic activity when the solar light as the light source. In the study, informed that the degradation of salicylic acid is first-order linear regression.