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標題: | 超聲波結合臭氧過氧化氫降解全氟丁烷磺酸之研究 Degradation of Perfluorobutanesulfonic Acid by Ultrasonic System with O3/H2O2 |
作者: | Bo-Yu Yu 游博宇 |
指導教授: | 駱尚廉(Shang-Lien Lo) |
關鍵字: | NULL |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 全氟化合物為良好的介面活性劑,因其優秀的疏水疏油特性,全氟化合物被廣泛運用於產品中,長碳鏈全氟化合物被許多文獻證實具有許多危害特性,已逐漸被淘汰,目前已開發出許多穩定且有效的處理方法,短碳鏈全氟化合物作為長碳鏈全氟化合物的替代品,已在許多自然介質中測得,目前關於短碳鏈全氟化合物的環境及健康危害評估十分缺乏,以致於國際及過內並無相關法規限制其使用及排放,因此發展穩定且有效之處理方式有其必要性。 本研究評估使用超聲波處理短碳鏈全氟化合物全氟丁烷磺酸 (PFBS) 之可行性,並探討不同重要參數對於超聲波系統去除PFBS之影響。在超聲波系統中,最佳參數為振福10 μm下,體積為500 mL之200 ppm PFBS溶液,系統溫度為25°C,系統pH值為3,攪拌速度為400 rpm,經超聲波反應360分鐘後,去除率為26.26%,脫氟率為20.28%,在超聲波結合臭氧系統中,最佳參數為振幅10 μm下,體積為500 mL之200 ppm PFBS溶液,系統溫度為25°C,系統pH值為3,臭氧流量為300 mg/hr,過氧化氫濃度為0.6 wt%,攪拌速度為400 rpm,經超聲波反應360分鐘後,去除率為41.69%,脫氟率為24.42%。PFBS處理效果與振幅及攪拌速度呈正相關,與溫度及pH值呈負相關,大部分添加劑均抑制處理效果,唯過氧化氫能提高處理效果。 最終藉由化學探針法添加第三丁醇至超聲波及超聲波結合臭氧系統中,證明兩系統中之優勢自由基為氫氧自由基,此研究建立超聲波氧化降解PFBS之操作參數資訊,可提供未來相關應用之參考依據。 Perfluorinated chemicals (PFCs) are perfect surfactants. Due to their excellent hydrophobic and oleophobic properties, perfluorinated compounds are widely used in products. Because of many hazardous properties of long-chain PFCs, they have been gradually eliminated. Many stable and effective treatment technologies have been developed to degrade long-chain PFCs.Instead, long-chain PFCs are substituted with short-chain PFCs, which have been measured in many natural media. Currently, the health and environmental evaluations of short-chain PFCs are lacking. There are no relavant regulations to restrict the use and emissions of short-chain PFCs in the world. So it is necessary to develop a stable and effective treatment technologies to degrade short-chain PFCs. This study evaluates the feasibility of degrading short-chain PFCs Perfluorobutanesulfonic acid (PFBS) with ultrasound, and explores the effects of different important parameters in ultrasonic system to remove PFBS. In ultrasound system, the optimal parameter is a 200 ppm PFBS solution with a volume of 500 mL with 10μm amplitude at 25°C under pH 3.0 in stirring speed 400rpm. After reaction for 360 minutes, the removal rate is 26.26% and the defluorination efficiency is 20.28%. In ultrasound conbined with ozone system, the optimal parameter is a 200 ppm PFBS solution with a volume of 500 mL with 10 μm amplitude at 25°C under pH 3.0 in stirring speed 400 rpm .The flow rate of zone is 300 mg/hr under 0.6 wt% H2O2. After reaction for 360 minutes, the removal rate is 41.69% and the defluorination efficiency is 24.42%. The PFBS treatment effect is positively correlated with the amplitude and stirring speed, and negatively correlated with the temperature and pH value. Most additives suppress the treatment effect, but hydrogen peroxide can improve the treatment effect. Hydroxyl radicals is the dominant radicals in both ultrasound and ultrasound conbined with ozone system, which was verified by tert-butanol probe addition. These results may provide references for the application of degrading short-chain PFCs by ultrasound. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61439 |
DOI: | 10.6342/NTU202001162 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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