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摘要
In this work, we have described the adsorption of dye acid blue 40 and methylene blue from aqueous solution onto isotypic zeolite imidazolate frameworks (ZIFs) such as ZIF-8 [Zn(mim)(2)] and ZIF-67 [Co(mim)(2)]. The results suggested that the charged sites at the external surface of zeolite imidazolate frameworks play a key role in dye adsorption. A similar adsorption capacity is observed for the uptake cationic dye methylene blue between ZIF-8 and ZIF-67, involving electrostatic interactions between the same N-extremities (belonging to mim linkers) and positively charged methylene blue. For anionic dye acid blue 40, the adsorption capacity for ZIF-67 is nearly three times higher than that of ZIF-8, involving electrostatic interactions between low-coordinated metal cations of zeolite imidazolate frameworks and negatively charged groups of acid blue 40 and Co cations in ZIF-67 have higher affinity with the SO3- groups of acid blue 40.
- 出版日期2013-11
- 单位太原理工大学
