利用磁性金屬臭氧催化劑降解水中消毒副產物

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Title:	利用磁性金屬臭氧催化劑降解水中消毒副產物
Other Titles:	The assembly of maagnetic metal ozone catalyst to decompose disinfection of byproduct
Authors:	呂理維 Lu, Li-Wei
Contributors:	張鎮南 Chang, Cheng-Nan 東海大學環境科學與工程學系
Keywords:	氧化還原電位;催化臭氧反應;臭氧反應;天然腐植酸;氫氧自由基 NOMs, Ozonation, ORP, hydroxyl radicals, catalytic ozonation
Date:	2011
Issue Date:	2011-10-12T16:50:16Z (UTC)
Abstract:	本研究採集天然水樣為供應大台中地區飲用水水源的德基水庫，利用DAX-8樹脂將原水樣品分離成五種有機成分，分別為腐植酸(10.8%)、黃酸(25.4%)、疏水性中性物質(23%)、疏水性鹼性物質(4.1%)和親水性物質(34.9%)。磁性Fe3O4/SiO2/CoOx催化顆粒利用溶膠凝膠法製成應用於催化臭氧反應上。而顆粒上的pHpzc 為 1.87，一開始先利用商業性腐植酸作為降解對象，找出在不同的pH值上的最佳降解效果。在pH 4時，比較於臭氧反應，催化臭氧反應有明顯的降解效果，而所得到的Kd值為0.214(s-1)。香豆素作為捕捉氫氧自由基的物質，也是觀察在催化臭氧反應下氧化直接與間接反應的途徑，實驗數據顯出直接/間接的比率為37/63在pH 4的條件之下，而pH 7時為39/61，pH 10 29/71。催化臭氧反應在降解腐植酸的數據A254，在pH 4為88.6%，在pH 7為82.6%，在pH 10為81.8%。催化臭氧反應其在酸、中、鹼都以間接氧化反應為主。 This study collected natural water samples from Te-Chi Reservoir which provides the water source to the metropolitan Taichung area. The organic contents of raw water sample were extracted and classified into hydrophobic neutrals (HPON, 23%), humic acids (HAs, 10.8%), fulvic acids (FAs, 25%) hydrophobic bases (HPOB, 4.1%) and hydrophilic fractions (HPI-F, 34.9%). Magnetic Fe3O4/SiO2/CoOx was synthesized by sol-gel methods as catalysts in ozonation. The catalysts was indicated with the pHzpc of 1.87. Initially, decomposition of commercial humic acid in different pH levels, (pH 4, 7 and 10) was investigated. The acidic condition was found have high decomposition rate (Kd, 0.214 S-1). The coumarin as a hydroxyl radical scavenger was investigated the contribution of direct/indirect oxidation mechanisms in deionized water by sole ozonation and catalytic ozonation in different pHs. Experimental data indicated the contribution of direct/indirect reactions were 37/63% in pH 4, 39/61% in pH 7 and 29/71% in pH 10 by catalytic ozonation, respectively. The indirect oxidation would be the major reaction mechanisms in the catalytic ozonation. The catalyst ozonation reduction rates of A254 are 88.6% (pH 4), 82.6 (pH 7) and 81.8% (pH 10), which is significantly improved than that of ozone alone systems.
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