本研究將奈米光觸媒二氧化鈦披覆在淨水器及玻璃珠上形成一層厚度很薄的薄膜，並且將玻璃珠放置在淨水器裡，再以亞甲基藍來模擬水中的有機物，然後利用淨水器及玻璃珠上的光觸媒進行光催化反應降解亞甲基藍，進一步了解光觸媒分解有機污染物的效果。本研究主要採用三種控制變數，分別為高低紫外線強度、初始有機物溶液濃度、玻璃珠比表面積，使用高低紫外線強度來模擬在不同天候狀況下淨水器吸收太陽光紫外線的狀況，所以其主要分成高和低兩種紫外線強度來比較有機物消退情形；初始有機物溶液濃度則是1ppm、3ppm、5ppm分別代表低中高濃度，藉以模擬不同水質污染的程度；至於比表面積主要是了解當增加光觸媒和待處理水溶液的接觸面積時對光催化反應的影響，進一步了解如果欲實用化淨水器時設計的重點項目。
研究結果顯示，當太陽光的紫外線強度增加時，光觸媒的效率有明顯的提升，但是當紫外線強度差異不大時效果不顯著。在比表面積方面，經實驗結果可知使用小粒徑玻璃珠對光催化反應得到較佳的結果，所以在工程應用上設計淨水器時宜採用比表面積較小玻璃珠或其他載體。在初始溶液濃度方面，初始濃度的增加有利於降解速率，濃度越高在固定時間下，降解速度較佳。

Nano photocatalyst is applied on the proposed water purification device in this research. The device is located on the roof of the building by using the nature power of sun to perform the reaction of nano photocatalyst.
A series of testing is designed in this research to investigate the proposed device which included the parameter of climate, contact area of nano photocatalyst, density of pollutant. The result showed the higher the intensity of sun power, the higher of the capability of purification. Higher contact area induced higher capability of purification from nano photocatalyst. The higher density of pollutant induced the higher purification.
The device is going to apply a pattern for commercial purpose.

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