引用本文:岳瑞, 陈红成, 黄玉明, 奉萍.聚乙烯亚胺交联法修饰磁性壳聚糖去除水中六价铬[J].西南大学学报(自然科学版),2019,41(7):125~130
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聚乙烯亚胺交联法修饰磁性壳聚糖去除水中六价铬
岳瑞, 陈红成, 黄玉明, 奉萍
三峡库区生态环境教育部重点实验室/西南大学 化学化工学院, 重庆 400715
摘要:
利用一锅热溶剂法合成磁性壳聚糖纳米颗粒(MCTS),再用聚乙烯亚胺(PEI)修饰,成功合成了一种新型磁性生物吸附材料PEI-MCTS,并将其用于吸附去除Cr(VI),系统研究了溶液初始pH值、PEI负载量、吸附剂用量、离子强度及吸附时间等对Cr(VI)吸附去除的影响.结果表明,酸性条件有利于Cr(VI)的吸附,PEI-MCTS吸附Cr(VI)符合Langmuir模型和准二级动力学模型,最大吸附量为193.57 mg/g.PEI-MCTS纳米复合材料稳定、重复使用性好,可用于Cr(VI)的吸附去除.
关键词:  聚乙烯亚胺  磁性壳聚糖  吸附  六价铬
DOI:10.13718/j.cnki.xdzk.2019.07.017
分类号:X703
基金项目:国家自然科学基金项目(21277111).
Cr(VI) Removal from Water with Polyethyleneimine-Modified Magnetic Chitosan
YUE Rui, CHEN Hong-cheng, HUANG Yu-ming, FENG Ping
The Key Laboratory of the Three Gorges Reservoir Region's Eco-Environments, Ministry of Education/School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
Abstract:
Magnetic chitosan (MCTS) nanoparticles were synthesized with a one-pot solvothermal method and then modified by polyethylenimide (PEI) to prepare magnetic PEI-MCTS for removing Cr(VI). The effects of the initial solution pH, PEI content, adsorbent dosage, ionic strength and adsorption time were systematically studied. The results showed that an acid condition favored Cr (VI) adsorption. Cr(VI) adsorption by PEI-MCTS could be described with the Langmuir model and the pseudo-second-order model, and the maximum adsorption capacity was 193. 57 mg/g. In conclusion, the PEI-MCTS composites developed in this study are stable and reusable and, therefore, are recommended for Cr(VI) removal.
Key words:  polyethyleneimine  magnetic chitosan (MCTS)  adsorption  Cr(VI)
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