Atom transfer radical polymerization with activators regenerated by electron transfer of acrylonitrile from silica nanoparticles, and adsorption properties of the resin for Hg2+ after amidoximation with hydroxylamine

作者：Zong, Guangxi; Chen, Hou^*; Tan, Zhi; Wang, Chunhua; Qu, Rongjun

来源：Polymers for Advanced Technologies, 2011, 22(12): 2626-2632.

DOI：10.1002/pat.1815

• surface initiated ARGET ATRP
• acrylonitrile
• amidoxime
• adsorption

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 (NH2OH center dot 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 Hg2+. The adsorption kinetics indicated that the pseudo-second-order model was more suitable to describe the adsorption kinetics of AO SG-g-PAN for Hg2+. The adsorption isotherms demonstrated that Langmuir model was much better than Freundlich model to describe the isothermal process.

• 出版日期2011-12
• 单位鲁东大学