| Summary: | 碩士 === 東海大學 === 環境科學與工程學系 === 106 === 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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