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標題: 利用氫氧化鎂與氫氧化鋁合成Mg-Al水滑石(LDH)之研究
Synthesis of Mg-Al LDH by using Mg(OH)2 and Al(OH)3
作者: 周文彬
Chou, Wenbiyn
關鍵字: Mg-Al LDHs
Mg-Al 水滑石
出版社: 材料科學與工程學系所
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摘要: 本實驗是利用氫氧化鎂 (Mg(OH)2) 與氫氧化鋁 (Al(OH)3) 來生成Mg-Al LDHs 粉末,使其用於吸收有毒廢水溶液中的氟離子。將氫氧化鎂與微量 Al(OH)3 於惰性環境與一般大氣環境溶液下反應,並以 HCl 與 NaOH 滴定使其溶液的pH 值於一定值之條件下,而形成不同組成結構的Mg-Al LDHs 粉末。於惰性環境溶液中所生成之 Mg-Al LDHs的陰離子間層結構內中含有 Cl 離子的鍵結結構,且經過X光繞射儀及ESCA (電子光譜化學分析儀) 分析,確認其為 Mg-Al-Cl-CO3 結構,又以 FT-IR (傅立葉轉換紅外線光譜儀) 分析後,顯示出於惰性環境條件下形成的 Mg-Al LDHs 粉末在 CO32- 處的訊號峰也有減少趨勢,故陰離子間層為氯離子鍵結。再利用 IC (離子交換層析儀) 觀察 Mg-Al LDHs 粉末氟離子置換吸收實驗,顯示出只需 0.2 克 Mg-Al LDHs 粉末,置於 22.5 ppm 的氟離子溶液中約 10 分鐘左右即可吸收 20.5 ppm,而置於 504 ppm 的氟離子溶液中約 140 分鐘,即可達到 81.05% 的氟離子吸收率。
This experiment is used by Mg(OH)2 and Al(OH)3 to produce the powders of the Mg-Al LDHs. This paper enables the powders to absorb the Fluorine ions of the poisonous waste aqueous solution. The powders and a little Al(OH)3 would put in the solution under the inert environment or the general atmospheric environment. This solution is titrated to use the HCl and the NaOH, and is made the pH value of its solution under preserving the stable conditions. The powders of the Mg-Al LDHs which are formed under the inert environment contain Cl ions in the medium layer of this structure among the anion. After they are analyzed by the X-ray、the ESCA (Electron Spectroscopy for Chemical analysis), it is confirmed that the structure of the powders is the Mg-Al-Cl-CO3. It decreases at the stretching vibration of the CO32- by using the FT-IR (Fourier-transform infrared spectra) to analyze under the inert environment. And it needs the 0.2g powders of the Mg-Al LDHs to be put in the 22.5 ppm fluoride solution about 10 minutes, the fluoride concentration decreases 20.5 ppm by using the IC (ion change chromatography). The 0.2g powders of the Mg-Al LDHs are put in the 504 ppm fluoride solution 140 minutes later, it attains the 81.05% removal efficiency of the fluoride from aqueous solution.
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