| Radioactive cesium pollution and organic pollutants have received considerable attention due to the increasing risks in development of the nuclear power plants and traditional industries in the world.Although various functional porous materials are utilized to adsorb pollutants in water,Prussian blue analogues(PBAs)are an impressive class of candidates because of their super affinity of Cs+ ions.The adsorption ability of the PBAs strongly relate to the mesosturcture and interstitial sites.To design a hollow PBA with large number of interstitial sites,the traditional hollowing methods are not suitable owing to the low crystallinity and difficulty in processing the specific PBAs with large number of interstitial sites.In order to increase number of interstitial sites,in this work,we employed a rational strategy which was to form a "metal oxide" @ "PBA" core-shell structure via coordination replication at first,then utilized a mild etching to remove the metal oxide core,led to hollow PBA finally.In this work,Cu2O was chosen to be core.We succeed in preparing hollow Cu-Fe PBA and hollow Cu-Co PBA.Furthermore,we use hollow Cu-Fe PBA to perform Cs+ adsorption and use hollow Cu-Co PBA to perform methylene blue adsorption. |
