不同緩衝層物質對於膠囊化高鐵酸鉀降解甲基橙之影響

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Title:	不同緩衝層物質對於膠囊化高鐵酸鉀降解甲基橙之影響
Other Titles:	The Effects of Buffer Agents as a Protective Layer of Encapsulated Potassium Ferrate for Oxidation of Methyl Orange
Authors:	郭玹妏 Kuo, Hsuan-Wen
Contributors:	鄧宗禹 Den, Walter 環境科學與工程學系
Keywords:	高鐵酸鉀;幾丁聚醣;膠囊化技術;降解甲基橙 Potassium ferrate;Chitosan;Encapsulation technology;Methyl orange degradation
Date:	2018
Issue Date:	2019-01-10T09:15:46Z (UTC)
Abstract:	本研究的目的在於改善高鐵酸鉀的穩定性，利用膠囊化的技術製備高鐵酸鉀膠囊，以高鐵酸鉀為芯材，幾丁聚醣為殼材，油酸、礦物油和椰子油作為緩衝層，並以甲基橙作為日標污染物。將製備完成的膠囊化高鐵酸鉀使用紫外-可見光光譜儀(UV-vis)測量其高鐵酸鉀的含量，探討使用不同緩衝層物質製備高鐵酸鉀膠囊對於降解甲基橙之影響，並分別探討幾丁聚醣、高鐵酸鉀和目標污染物間的關聯。製備完成的膠囊經冷凍乾燥後會使高鐵酸鉀的含量大幅下降，而使用椰子油單層包覆及幾丁聚醣/椰子油雙層包覆的濕膠囊之高鐵酸鉀含量分別為0.48及0.13 mg，對於濃度為5 mg/L甲基橙水溶液之去除率分別為85.7%及30%。結果顯示三種不同緩衝層物質(油酸、礦物油、椰子油)對於高鐵酸鉀之保存，效果最佳者為礦物油，以油酸作為緩衝層會使高鐵酸鉀無法釋放，而對於製備高鐵酸鉀膠囊所使用的緩衝層物質，最適者為椰子油。 Ferrate has been proven as an effective oxidant for water and wastewater purification and disinfection. However, it is also highly unstable in air with moisture and thus has to be consumed onsite. Encapsulation is a viable option to improve the stability of potassium ferrate, and can be use to control its release at the point of application. In this study, chitosan was used for the wall material, the oleic acid, mineral oil and coconut oil were selected as buffer agents. The encapsulated potassium ferrate were characterized by ultraviolet-visible spectroscopy (UV-Vis) to measure the content of ferrate(VI). The effectiveness of the encapsulated ferrate potassium was tested against the degradation of methyl orange as a model organic compound.After freeze drying, ferrate(VI) content of capsules decreased dramatically The ferrate(VI) content of Fe (VI)/coconut particles and Fe(VI)/coconut/chitosan capsules were 0.48 and 0.13 mg, respectively. In degradation of methyl orange study, the efficiency of Fe (VI)/coconut particles and Fe (VI)/coconut/chitosan capsules for the degradation of methyl orange were 85.7% and 30%, respectively.The results indicated that mineral oil was the best buffer agent for potassium ferrate storage as Fe(VI) slowly released from the buffer layer. Coconut oil, in turn, allowed faster release of Fe(VI). There was no release of Fe(VI) observed from oleic acid as a protective layer, deeming oleic acid unbefitting as a buffer agent.
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