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首页> 外文期刊>Polymers for advanced technologies >Atom transfer radical polymerization with activators regenerated by electron transfer of acrylonitrile from silica nanoparticles, and adsorption properties of the resin for Hg~(2+) after amidoximation with hydroxylamine
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Atom transfer radical polymerization with activators regenerated by electron transfer of acrylonitrile from silica nanoparticles, and adsorption properties of the resin for Hg~(2+) after amidoximation with hydroxylamine

机译：二氧化硅纳米粒子中丙烯腈的电子转移可再生带有活化剂的原子转移自由基聚合，以及羟胺酰胺化后树脂对Hg〜（2+）的吸附性能

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摘要

Polyacrylonitrile (PAN) was grafted from surfaces of chloro-modified silica-gel with their surface chlorines as initiation sites, using an iron (III)-mediated surface-initiated atom transfer radical polymerization (ATRP) with activators regenerated by electron transfer (SI-ARGET ATRP) method. The graft reaction exhibits first-order kinetics with respect to the polymerization time in the low-monomer-conversion stage. The conversion of monomer (C%) and the percentage of grafting (PG%) increased with increasing of the polymerizing time and reached 23 and 730% after a polymerizing time of 24 hr, respectively. Hydroxylamine (NH_2OH·HCl) was used to modify the cyano groups of SG-g-PAN to obtain amidoxime (AO) groups. The AO SG-g-PAN was used to remove Hg~(2+). The adsorption kinetics indicated that the pseudo-second-order model was more suitable to describe the adsorption kinetics of AO SG-g-PAN for Hg~(2+). The adsorption isotherms demonstrated that Langmuir model was much better than Freundlich model to describe the isothermal process.
机译：使用铁（III）介导的表面引发原子转移自由基聚合（ATRP）和通过电子转移再生的活化剂（SI- ARGET ATRP）方法。在低单体转化阶段，接枝反应相对于聚合时间表现出一级动力学。单体的转化率（C％）和接枝率（PG％）随着聚合时间的增加而增加，并且在24小时的聚合时间之后分别达到23％和730％。用羟胺（NH_2OH·HCl）修饰SG-g-PAN的氰基，得到a肟（AO）。用AO SG-g-PAN去除Hg〜（2+）。吸附动力学表明，拟二级模型更适合描述AO SG-g-PAN对Hg〜（2+）的吸附动力学。吸附等温线表明，Langmuir模型比Freundlich模型更好地描述了等温过程。

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