以高級氧化程序礦化水中對-硝基苯酚之研究;Using Advanced Oxidation Process to Mineralize p-Nitrophenol in Aqueous Solution

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Title:	以高級氧化程序礦化水中對-硝基苯酚之研究;Using Advanced Oxidation Process to Mineralize p-Nitrophenol in Aqueous Solution
Authors:	陳伯全;POCHUAN,CHEN
Contributors:	環境工程研究所
Keywords:	高級氧化;臭氧;UV;p-Nitrophenol;礦化效率;Advanced oxidation;Ozone;UV;p-Nitrophenol;Mineralization efficiency
Date:	2014-07-24
Issue Date:	2014-10-15 17:25:57 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究主要將含有p-Nitrophenol之溶液，以O3結合UV及H2O2之高級氧化程序進行礦化處理，並以總有機碳(Total Organic Carbon; TOC)作為p-Nitrophenol之礦化效率指標。於不同高級氧化程序， p-Nitrophenol礦化效率排序為：UV/O3>UV/O3/H2O2>O3>O3/H2O2>UV/H2O2，最佳p-Nitrophenol礦化效率之高級氧化程序為UV/O3程序(78.1%)。於UV/O3程序，實驗結果顯示隨著H2O2注入劑量之增加， p-Nitrophenol之礦化效率隨之減少。H2O2在UV/O3程序主要扮演掠奪者之角色。於O3程序，控制H2O2注入劑量為0~31.60 mg/min，實驗結果顯示H2O2注入劑量3.95 mg/min時對p-Nitrophenol礦化提升之效率最為顯著，於UV/O3程序，分別控制反應過程之pH值為3.0~10.0，實驗結果顯示控制pH值時皆優於未控制pH值，其中pH值為10.0礦化效率最佳。另以初始反應濃度10~100 mg/L，實驗結果顯示隨著初始反應濃度增加，p-Nitrophenol礦化效率及轉化率隨之降低。由實驗結果可觀察到UV/O3程序礦化p-Nitrophenol之過程並非單純之一階反應(First-order reaction)，而是擬一階反應(Pseudo first-order reaction)；擬一階反應常數(kobs)介於0.0032~0.0175 min-1之間，隨著H2O2注入劑量增加，擬一階反應常數(kobs)隨之降低；不同pH值之擬一階反應常數(kobs)介於0.0158~0.0291 min-1之間，控制pH值為10.0時具有最佳之反應速率；不同p-Nitrophenol初始反應濃度之擬一階反應常數(kobs)介於0.0134~0.0806 min-1之間。 ;This present study aims to evaluate the performance of advanced oxidation processes that combines UV, O3 and H2O2 to mineralize p-Nitrophenol in aqueous solution. The concentration of total organic carbon (TOC) was selected as an efficiency index of p-Nitrophenol mineralization. For different advanced oxidation processes, the efficiency of p-Nitrophenol mineralization followed the sequence UV/O3>UV/O3/H2O2>O3>O3/H2O2>UV/H2O2. The UV/O3 process got the best 78.1% efficiency of p-Nitrophenol mineralization. For the UV/O3 process, the results indicated that as the concentration of H2O2 increased, the rate of p-Nitrophenol mineralization declined. In other words, H2O2 acted as a scavenger of hydroxide radical ( ). While for the O3 process, it indicated that the efficiency of p-Nitrophenol mineralization is optimal when H2O2 dosage is 3.95 mg/min among .0 to 31.60 mg/min. Also for the UV/O3 process, the mineralization efficiency is optimal when pH was fixed to be 10.0 than pH was fixed below 10.0 or when pH was not fixed in oxidation process. When initial p-Nitrophenol concentration was controlled as 10~100 mg/L and pH was controlled as 10.0, it indicated that the efficiency of p-Nitrophenol mineralization declined as the initial p-Nitrophenol concentration increased. Hence, the mineralization rate of highly concentrated p-Nitrophenol was lower. It is observed that process of p-Nitrophenol mineralized by UV/O3 is not just a simple first-order reaction but pseudo first-order reaction. The pseudo first-order rate constant (kobs) of different H2O2 dosage was calculated between 0.0032~0.0175 min-1. As the H2O2 increases, the reaction rate constant declined. The pseudo first-order rate constant (kobs) for pH among 3.0 to 10.0 was calculated to be between 0.0158~0.0291 min-1. Still, when pH was fixed to be10.0 the oxidation process got the best reaction rate constant. The pseudo first-order rate constant (kobs) for different initial p-Nitrophenol concentration was calculated between 0.0134~0.0806 min-1.
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