吸附
结晶度
共价键
化学
朗缪尔吸附模型
傅里叶变换红外光谱
共价有机骨架
红外光谱学
扫描电子显微镜
朗缪尔
核化学
化学工程
分析化学(期刊)
物理化学
材料科学
有机化学
结晶学
工程类
复合材料
作者
Xiao-Fan Lu,Wenhua Ji,Yuan Lin,Shui Yu,Dian‐Shun Guo
标识
DOI:10.1021/acs.iecr.9b03138
摘要
A carboxy-functionalized covalent organic framework COOH@COF for efficient removal of Pb2+ and Hg2+ ions from water has been prepared. Fourier transform infrared spectroscopy, solid-state 13C NMR spectra, and elemental analysis indicate that the carboxy function has been grafted to COF materials via the click reaction. Its crystallinity remains unchanged after post-synthetic modification, as confirmed by the powder X-ray diffraction. Scanning electron microscopy images reveal that the COOH@COF possesses the thorn ball structure assembled by numerous nanowires with a diameter of 90 nm. This COOH@COF features excellent adsorption capacities for Pb2+ (123.8) and Hg2+ (99.1 mg/g) in water. The adsorption isotherms follow the Langmuir model, and their kinetics adsorption fits the pseudo-second-order model. Particularly, the COOH@COF can be recycled 20 times without loss of the adsorption capacity in water, showing its latent potential for practical application in the future.
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