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Synthesis of polyethylenimine-modified magnetic hydrogel nanocomposite absorbents for heavy metals removal
Korean Journal of Chemical Engineering ( IF 2.9 ) Pub Date : 2022-06-18 , DOI: 10.1007/s11814-022-1168-2
Tao Wan , Songsong He , Tairan Wang , Jian Wang , Mingrui Yu , Yang Jia , Qi Tang

Polyethylenimine(PEI)-modified magnetic hydrogel nanocomposite absorbents (PEI-mHNAs) were fabricated based on poly(acrylamide-co-acrylic acid) and PEI-modified magnetic nanoparticles by radical copolymerization. FTIR and XRD results preliminarily confirmed the target structure of PEI-mHNAs without destroying the structure of magnetic nanoparticles during modification and radical copolymerization. PEI-mHNAs with many rough porous and interstitial structure had high adsorption capacity of Cu(II) (217 mg/g), Cd(II) (232 mg/g) and Pb(II) (459 mg/g). PEI-mHNAs had the best absorption capacity for heavy metal ions in the synthesis condition of acrylic acid/acrylamide mass ratio of 60:40, 0.8% initiator, AA neutralization degree of 70%, 0.75% crosslinker, and 15% PEI-modified magnetic nanoparticles. Moreover, PEI-mHNAs had good magnetic responsiveness, high thermal stability and reusability, which make it a potential application in removing heavy metal ions from the contaminated wastewater.



中文翻译:

用于重金属去除的聚乙烯亚胺改性磁性水凝胶纳米复合吸附剂的合成

聚乙烯亚胺(PEI)改性磁性水凝胶纳米复合吸收剂(PEI-mHNAs)是基于聚丙烯酰胺-共聚丙烯酸和PEI改性磁性纳米粒子通过自由基共聚制备的。FTIR和XRD结果初步证实了PEI-mHNAs的目标结构,在改性和自由基共聚过程中不破坏磁性纳米粒子的结构。具有许多粗糙多孔和间隙结构的 PEI-mHNA 对 Cu(II) (217 mg/g)、Cd(II) (232 mg/g) 和 Pb(II) (459 mg/g) 具有较高的吸附能力。PEI-mHNAs在丙烯酸/丙烯酰胺质量比60:40、0.8%引发剂、AA中和度70%、0.75%交联剂、15%PEI改性磁性的合成条件下对重金属离子的吸附能力最好。纳米粒子。此外,PEI-mHNAs 具有良好的磁响应性,

更新日期:2022-06-20
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