黏粒中不同水合能交換性陽離子催化加氯副產物之探討; The effect of different hydration energy cation on organic compound chlorination during drinking water purification process.

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题名:	黏粒中不同水合能交換性陽離子催化加氯副產物之探討;The effect of different hydration energy cation on organic compound chlorination during drinking water purification process.
作者:	朱永成;Yung-Chen Chu
贡献者:	環境工程研究所
关键词:	交換性陽離子;水合能;消毒副產物;氣態吸附等溫線;exchanged cation;disinfection by-products;hydration energy;adsorption isotherm
日期:	2005-07-04
上传时间:	2009-09-21 12:16:56 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究探討以黏土顆粒模擬水中濁度時，黏土中交換性陽離子水合能特性於催化氯化反應過程對消毒副產物生成之影響。實驗分為水相及氣相兩部分，水相部分，選擇鈣蒙特石、鎂蒙特石、鉀蒙特石、鈉蒙特石及銫蒙特石等五種具不同水合能交換性陽離子之黏土，對不同溶解性有機物進行氯化反應催化；氣相部分，則以不同水合能交換性陽離子為吸附劑，進行水分子及不同極性有機物之氣態吸附。希望藉由實驗結果，釐清消毒副產物生成與黏土交換性陽離子水合能之關係。實驗結果顯示，五種黏土中僅鉀蒙特石及鈣蒙特石，其消毒副產物與陽離子之水合能特性有明顯相關。進一步探討此二黏土所催化的副產物，在不同水溶解度有機前趨物下，皆出現DBPs鉀蒙特石> DBPs鈣蒙特石，推論黏土交換性陽離子之水合能高低，會使催化位址受水分子干擾的程度出現差異，致使消毒副產物之生成有明顯不同。有機前趨物之溶解度主要為影響接近催化位址的機率，但並不代表有機物之化學活性，因此與消毒副產物之生成無明顯的關係。以不同水合能交換性陽離子黏土對水分子進行吸附，發現水分子的吸附量與陽離子之水合能有正相關，此表示黏土催化位址受水分子干擾也為正相關。不同極性有機物於氣相吸附過程中，並未顯現與不同水合能交換性陽離子之黏土有明顯的關連，此結果仍與水相部分之實驗相呼應。由本研究結果推論，黏粒中的交換性陽離子其水合能特性不同，的確會使黏土的催化位址受到影響，使得催化能力具有差異性，進而致使消毒副產物產量也因此發生變化。 The effect of hydration energy cation on organic compound chlorination during drinking water purification process was studied using montmorillonite with five exchangeable cations(Ca, Mg, K, Na, Cs) as simulated suspended solid. The experiments were conducted adsorption of organic compounds on clays both in gas phase and in liquid phase. For the gas adsorption, the sorbates consisted of water and some polar organic compounds, and the sorbents are the clays with exchangeable cation. For the aqueous system, the different exchangeable cations on clay surface are regarded as catalytic center to investigate the relationship between the hydration energy of metal cation and the chlorinated reaction of organic compounds. The obtained results indicated that Ca-montmorillonite (Ca-mont) and K-montmorillnite (K-mont) were effective catalyzers as showing in good correlation between hydration energy and DBPs production. For all of the organic precursors, the DBPs produced were Ca-mont > K-mont, implying that the differences in hydration energy of cations could lead to the different hydration level on catalytic sites. The water solubilities of organic precursors represent the probability of the organic compounds to reach catalytic sites. However, chemical activities of organic compounds are a key point for the DBPs production. The results obtained from vapor-phase experiments show that the water adsorption has a strong correlation with the hydration energy of the clay surface cation. Our findings in this study imply that the hydration energy of cations on the clay surface can generate the different catalytic sites to change the disinfection by-products formation potential(DBPFP).
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