摘要
利用紫外-可见吸收光谱和粉末X射线衍射等技术,通过染料吸附实验、混合染料吸附实验、吸附动力学实验和循环吸附实验,研究了一种铕基金属有机框架材料从混合染料水溶液中选择性分离亚甲基蓝的性能与机理.研究结果表明,该材料对亚甲基蓝的最大吸附量为20 mg/g,在12 h内可完成对亚甲基蓝的选择性吸附,且可以循环使用3次以上.混合染料吸附实验结果表明,该材料的吸附选择性源于孔道的静电作用与尺寸排斥效应.
Although Eu-based metal-organic frameworks as fluorescence sensors have been reported widely,they are rarely used to separate dyes selectively owing to the lack of water stability. Herein,we choose a reported Eu-MOF to separate MB(methylene blue)selectively from mixed dyes aqueous by ion exchanges between the cations in the pore channels of the Eu-MOF and MB. The results show that MB can be separated selectively and quickly from the mixture of dyes. Meanwhile,the Eu-MOF not only has the relatedly high absorbing capacity of ca. 20 mg/g in aqueous solution at room temperature,but also can be recycled for 3 times at least. Moreover,the mechanism of highly selective absorption was also discussed,and as a consequence,the charge interaction and size exclusion play a key role in the absorption progress.
作者
柳雪广
杨晓珊
马菁菁
刘伟生
LIU Xueguang;YANG Xiaoshan;MA Jingjing;LIU Weisheng(Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province,State Key Laboratory of Applied Organic Chemistry,Key Laboratory of Special Function Materials and Structure Design,Ministry of Education,College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第1期203-211,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21871122,21431002)
中央高校基础研究基金(批准号:lzujbky-2018-kb12)资助~~。
