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摘要
Ultralight graphene foams have recently attracted attention due to their unique properties and applications, but few analogues of metal oxides possible to prepare. Here, a new monolith of three-dimensional titania has been prepared for the first time by a simple lyophilization treatment of exfoliated titanate nanosheets in colloidal suspension. The robust and shape-formable foam is of a density as low as 5 mg cm(-3). It possesses a porous layered architecture, large interlayer spacing, and large and negatively charged specific surface area, which exhibits excellent hygroscopicity and capacity for metal cation adsorption. In both mechanical compression and heavy metal ion absorption from water, it demonstrates remarkable recyclability and fast kinetics, capable of full recovery and repeated operation. Significantly outperforming all other inorganic sorbents, it may find applications in decontamination/enrichment/recovery of toxic, radioactive and valuable metal ions.
- 出版日期2017-8-14
- 单位稀土材料化学及应用国家重点实验室; 中国科学院上海硅酸盐研究所; 高性能陶瓷和超微结构国家重点实验室; 北京大学; 中国科学院大学
