自1970年代起，TiO2在光催化性質方面的研究開始興起。由於TiO2對環境無害，目前已廣泛運用於光降解、分解水及染料敏化太陽能電池等光伏應用。將TiO2或其前驅物在鹼性環境下反應則可得到一層狀結構的鈦酸鹽類。其結構為帶負電的TiO6層與帶正電之陽離子層組成。這種層狀鈦酸鹽在重金屬離子捕捉、有機汙染物吸附及光降解等方面皆有應用價值。目前已有的層狀鈦酸鹽的合成方法是將TiO2和鹼金屬或強鹼溶液反應，或是將含鈦之前驅物在鹼性溶液中反應得到。

在本論文中提出以和文獻中不同的方法合成層狀鈦酸鹽，使用溶液為甲醯胺，而合成得到之層狀鈦酸鹽是以NH4+作為夾層陽離子。經由X-ray繞射鑑定，可確認以這種方法合成的層狀鈦酸鹽是和JCPDS資料庫中已建檔之層狀鈦酸鹽H2Ti2O5不同，且由傅立葉紅外光譜儀(FT-IR)鑑定得知產物中的確有NH4+存在。最後由熱重分析(TGA)結果計算產物分子式為(NH4)2Ti7O15。產物比表面積由BET法計算為334 m2/g，在亞甲基藍(MB)吸附實驗中可達到213 mg/g之吸附量。

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