Two-Layer Encapsulation of Ferrate(Ⅵ) with Chitosan and Hydrocarbon Buffer
Ferrate with high valences (Ⅳ, Ⅴ, Ⅵ) is widely considered as a green oxidant that is naturally abundant and environmentally friendly when released or disposed.The redox potential of these ferrates render them a potential replacement of existing oxidants that can be either chemically abrasive or environmentally hazardous.The downside of ferrates is the instability of the oxidative states when they are exposed to open-air conditions where the presence of moisture quickly reduces ferrates into their naturally stable form as Fe(Ⅲ).This study aims to encapsulate ferrate (Ⅵ) using green materials in chitosan to preserve its stability while maintaining the oxidizing power.Herein we report the characteristics of the chitosan-walled Fe(Ⅵ) particles and their control-release properties.The as-prepared chitosan-ferrate microcapsules demonstrated greater rate of ferrate release when exposed in a more acidic condition, indicative of the structural change of chitosan network generating pores to allow diffusion of ferrate.The extent of degradation of orange methyl (a dye compound) using the ferrate microcapsules was also consistent with the control release study.The degradation rate was accelerated in more acidic conditions where the release rate of ferrate from the microcapsules was enhanced.
Bo-Yen CHEN Walter DEN
Department of Environmental Science and Engineering, Tunghai University, Taiwan, China
国际会议
The 2017 International Symposium on Environmental Science and Technology (2017环境科学与技术国际会议)
北京
英文
7-11
2017-09-19（万方平台首次上网日期，不代表论文的发表时间）