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用于有效和高效的去除的合成改造共价有机框架

Qi Sun¹, Briana Aguila¹, Jason Perman¹

¹Department of Chemistry, University of South Florida , 4202 East Fowler Avenue, Tampa, Florida 33620, United States.

Journal of the American Chemical Society

|February 23, 2017

概括

新的共价有机框架 (COF) 提供了优越的去除. 这些先进的材料有效地从水和空气中捕获,显示出高容量和环境修复应用的亲和力.

科学领域:

材料科学
环境科学
化学学

背景情况:

设计有效的吸附剂用于环境修复需要高亲和度的化位点以快速吸收污染物和容量.
二维共价有机框架 (COF) 提供可调节的结构和多孔性,使其成为吸附剂开发的有希望的支架.

研究的目的:

设计和合成一种具有硫衍生物功能的新型中性COF,以有效地去除.
评估功能化COF对物种 (Hg2+和Hg0) 的吸附能力,亲和力和机制.

主要方法:

合成乙烯功能化中孔性COF (COF-V),然后通过烯点击反应与1,2-乙乙醇进行修饰,产生COF-S-SH.
在水溶液和空气中测试COF-S-SH对Hg2+和Hg0的吸附性能.
使用X射线吸收细结构 (XAFS) 光谱来阐明的结合机制.

主要成果:

合成的COF-S-SH呈现出异常的Hg2+和Hg0吸附能力,分别为1350和863毫克g-1,超过现有的醇功能化材料.
实现了2.3 × 109 mL g-1的超高分布系数 (K_d),迅速降低了Hg2+度到低于饮用水限值.
在XAFS分析中,通过分子内合作,两颗硫原子的Hg结合是独一无二的,这解释了这种强烈的亲和力.

结论:

装饰着硫化基的中孔性COF是用于修复的高效吸附剂.
在COF中,有序结构和高密度的结合点有助于优异的吸附性能和快速扩散.
这项研究强调了COF在开发高性能环境修复先进材料方面的巨大潜力.

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