Construction of a Repairable Fixed Porous Catalytic\nBed Loaded with Gold Nanoparticles via Multivalent Host–Guest\nInteractions

Abstract

The reversible combination\nbetween gold nanoparticles (AuNPs) and\ncarriers is crucial for the preparation of a recycle system. Here,\na repairable catalytic system was constructed on the basis of AuNPs\nand porous nickel (PNi) which were combined through the multivalent\nhost–guest interactions between βCD-AuNPs and PNi@IPTS-Azo\n[β-CD, β-cyclodextrin; IPTS, (3-isocyanatopropyl) triethoxysilane;\nAzo, azobenzene]. The large specific surface area and connected porous\nstructure of PNi provide a good opportunity to achieve the multivalent\ninteractions between βCD-AuNPs and PNi@IPTS-Azo in the nickel.\nAdditionally, the reaction solution could be catalyzed by flowing\nover the PNi@IPTS-Azo@βCD-AuNPs substrates. This catalytic model\nshowed a high efficiency close to 95%. Because of the reversible host–guest\ninteractions between β-cyclodextrin and azobenzene, the catalytic\nsystem could be regenerated by removing the deactivated AuNPs with\nUV-light irradiation and recombining new ones through multivalent\ninteractions <i>in situ</i>. This type of catalytic system\nis regenerative, material-saving, and effective. This system could\nbe expected to be constructed as catalytic fixed beds and applied\nin industry.