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摘要
合成了聚乙烯亚胺(PEI)改性果胶-四氧化三铁(Fe3O4)磁性吸附剂,分别用红外光谱、扫描电镜等对样品进行表征,并考察了时间、浓度、pH等条件对吸附效果的影响。结果表明:合成了PEI改性果胶-Fe3O4磁性吸附剂,其表面粗糙,有连续的沟壑结构;PEI改性果胶-Fe3O4对灿烂绿的吸附过程符合准二级吸附动力学方程、Freundlich等温吸附模型,对灿烂绿的吸附是化学吸附且为多层吸附。确定的最佳吸附条件为:在吸附时间90min,灿烂绿初始浓度为400mg/L,吸附温度50℃,pH为3—5的范围内,磁性吸附剂投放量0.01g,吸附剂的平均吸附量为787.3mg/g并且在循环使用数次后,去除率尚佳。
Abstract
Polyethyleneimine (PEI) modified pectin-ferro ferric oxide (Fe3O4) magnetic adsorbent was synthesized,and the samples were further characterized by FT-IR and SEM.The effects of time,concentration,pH and other conditions on the adsorption effect were also investigated.The results of the study showed that PEI modified pectin-Fe3O4 magnetic adsorbent had rough surface and continuous ravine structure.Moreover,its adsorption process of PEI modified pectin-Fe3O4 towards Brilliant Green was in accordance with the pseudo second order adsorption Kinetic equation and Freundlich isothermal adsorption model,and was multi-layer chemical adsorption.The optimal adsorption conditions were determined as follows:the adsorption time was 90min,initial concentration of brilliant green was 400mg/L,adsorption temperature was 50℃,pH was within the range of 3—5,and the dosage of magnetic adsorbent was 0.01g.Under this condition,the average adsorption capacity of the adsorbent reached to 787.3mg/g,and the removal rate was still good after recycling for several times.
关键词
聚乙烯亚胺
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改性果胶磁性微球
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亮绿
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吸附
Key words
polyethyleneimine
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modified pectin magnetic microspheres
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brilliant green
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adsorbent
聚乙烯亚胺改性果胶-Fe3O4对亮绿废水的吸附性能研究[J].
化工新型材料, 2022, 50(12): 146-150 DOI:10.19817/j.cnki.issn1006-3536.2022.12.028
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基金资助
“十二五”国家支撑计划项目课题(2012BAD29B06);国家重点研发计划重点项目(2017YFD0400106)
