茶提取物在不同气氛下合成的铁基纳米颗粒的表征与反应性
Characterization and reactivity of iron based nanoparticles synthesized by tea extracts under various atmospheres.
作者信息
Lin Jiewen, Weng Xiulan, Dharmarajan Rajarathnam, Chen Zuliang
机构信息
School of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
出版信息
Chemosphere. 2017 Feb;169:413-417. doi: 10.1016/j.chemosphere.2016.11.092. Epub 2016 Nov 25.
Bio-synthesis of Fe NPs in inert (nitrogen N-Fe NPs) and oxygen (O-Fe NPs) atmospheres employing green tea extracts was investigated through SEM, EDS, XPS and FT-IR techniques. The particle sizes of N-Fe NPs and O-Fe NPs were confirmed by SEM showing 84.7 ± 11.5 nm and 117.8 ± 26.2 nm respectively with subsequent evaluation of the percentage composition of Fe and O by EDS. The XPS results showed that the zero-valent iron and iron oxide nanoparticles were found to be dominant synthesized respectively in nitrogen and oxygen atmospheres. The FT-IR spectra further demonstrated that the surface functional groups of Fe NPs were different by varying the synthesis atmosphere. Fe NPs were used to remove methylene blue (MB) to test the reactivity, and the removal efficiency of MB using N-Fe NPs was 98.7%, while that of O-Fe NPs was only 65.3%. Thus it is clearly demonstrated that the synthesis atmosphere has prominent effects on the formation and catalytic properties of Fe NPs.
通过扫描电子显微镜（SEM）、能谱仪（EDS）、X射线光电子能谱（XPS）和傅里叶变换红外光谱（FT-IR）技术，研究了利用绿茶提取物在惰性（氮气，N-Fe NPs）和氧气（O-Fe NPs）气氛中生物合成铁纳米颗粒的过程。SEM确认了N-Fe NPs和O-Fe NPs的粒径，分别为84.7±11.5纳米和117.8±26.2纳米，随后通过EDS评估了铁和氧的百分比组成。XPS结果表明，在氮气和氧气气氛中分别主要合成了零价铁和氧化铁纳米颗粒。FT-IR光谱进一步表明，通过改变合成气氛，铁纳米颗粒的表面官能团有所不同。使用铁纳米颗粒去除亚甲基蓝（MB）以测试其反应活性，使用N-Fe NPs对MB的去除效率为98.7%，而O-Fe NPs的去除效率仅为65.3%。因此，清楚地表明合成气氛对铁纳米颗粒的形成和催化性能有显著影响。
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