气凝胶
吸附
水溶液中的金属离子
X射线光电子能谱
金属有机骨架
化学工程
水溶液
复合数
金属
沸石咪唑盐骨架
咪唑酯
化学
无机化学
材料科学
复合材料
有机化学
冶金
工程类
作者
Dawei Li,Xiaojuan Tian,Zunqin Wang,Zhuo Guan,Xiaoqiang Li,Hui Qiao,Huizhen Ke,Lei Luo,Qufu Wei
标识
DOI:10.1016/j.cej.2019.123127
摘要
A novel adsorbent based on zeolitic imidazolate framework-67 (ZIF-67, a sort of metal-organic framework) modified bacterial cellulose/chitosan (BC/CH) composite aerogel was prepared through a facile method combining physical mixture, in situ synthesis, and lyophilization. The water stability of CH aerogel was improved by incorporating BC nanofibers instead of using environmentally unfriendly chemical crosslinking agent. The loading rate of ZIF-67 was as high as 46.1% and the BET specific surface area of ZIF-67/BC/CH aerogel reached to 268.7 m2 g−1, which was much larger than that of BC/CH aerogel (8.4 m2 g−1). The as-prepared ZIF-67/BC/CH aerogel was employed to remove heavy metal ions and organic dye in aqueous solution. The adsorption capacities of the composite aerogel for Cu2+ and Cr6+ were 200.6 mg g−1 and 152.1 mg g−1, respectively. Moreover, the adsorption mechanism was investigated by X-ray photoelectron spectroscopy (XPS). Besides, the aerogel also showed almost 100% of removal rate toward active red X-3B through one time of adsorption. Consequently, the ZIF-67/BC/CH aerogel, as a novel and high efficient adsorbent, has a good application potential for wastewater treatment.
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