二氨基马来腈官能化的双壳空心MIL

中空金属有机骨架（MOF）由于其独特的核壳结构而引起了广泛的关注。作为一种新型的铀吸附剂，通过后合成方法将氨基接枝到配位不饱和位点（CUS）上，制备了对氨基苯甲酸铬（III）的二氨基马来腈（DAMN）功能化的双壳中空（DSHM）金属-有机骨架。用TEM，XRD，氮吸附和FT-IR光谱对获得的DAMN功能化空心MOF进行表征。铀的最大吸附量为601 mg g -1超过了所有已知的功能化MIL-101铀吸附材料。最佳吸附pH为8，接近海水的pH。此外，铀在模拟海水中的高选择性和高吸附率为将DSHM-DAMN引入海水中提取铀提供了广阔的前景。在这项工作中，我们首先将空心MOF应用于铀的吸附，这大大提高了MOF材料的铀吸附性能。我们还探讨了中空MOF材料的实际应用。

"点击查看英文标题和摘要"

Hollow metal-organic frameworks (MOFs) have attracted wide interest because of their unique core-shell structure. As a novel uranium adsorbent, diaminomaleonitrile (DAMN) functionalized double-shelled hollow (DSHM) metal-organic framework of chromium(III) terephthalate was prepared by a post-synthetic method of grafting amino group onto coordinatively unsaturated sites (CUS). TEM, XRD, nitrogen sorption and FT-IR spectrometry were used to characterize the obtained DAMN functionalized hollow MOF. The maximum capacity of uranium adsorption is 601 mg g−1, which exceeds all known functionalized MIL-101 uranium adsorption materials. The optimal adsorption pH is 8 which is close to the pH of seawater. Furthermore, the high selectivity of uranium and high adsorption rate in simulated seawater provide a promising prospect to introduce DSHM-DAMN for the extraction of uranium from seawater. In this work, we first applied hollow MOF for uranium adsorption, which greatly improves the uranium adsorption performance of MOF materials; we also explored the practical application of hollow MOF materials.