Fabrication of bimetallic Hofmann-type metal-organic Frameworks@Cellulose aerogels for efficient iodine capture.

It is of great significance to capture radioiodine from nuclear-related activities. Herein, We fabricated two kinds of hybrid aerogels composed with bimetal Hofmann-type metal-organic frameworks (Co–Fe)II(pz)[NiII(CN) 4 ] and cellulose aerogels by in-situ growth and doping method (named CoFe@CA-IS and CoFe@CA-D, respectively). The hybrid aerogels possessed excellent iodine adsorption performance. The addition of (Co–Fe)II(pz)[NiII(CN) 4 ] increased the porosity of the hybrid aerogels. The porosities of CoFe@CA-IS and CoFe@CA-D were reached 86.7% and 87.8%, respectively, which are higher than pure cellulose aerogels. Furthermore, the doping method provide a significant improve of adsorption performance. The equilibrium adsorption capacity of CoFe@CA-D reached 457.99 mg g−1 and the equilibrium adsorption capacity of CoFe@CA-IS was 194.34 mg g−1. In addition, the hybrid aerogels showed excellent recycle ability, the equilibrium adsorption capacity of CoFe@CA-IS and CoFe@CA-D remained 81% and 91% after 5 cycles. The results suggested that this metal-organic framework@cellulose hybrid aerogel showed great potential in iodine treatment and could be applied in a wide field. A metal-organic framework@cellulose aerogel was synthesized and exhibited outstanding adsorption performance for iodine. Image 1 • Bimetal Hofmann-type MOFs are developed and (Co–Fe)II(pz)[NiII(CN) 4 ] shows the excellent iodine adsorption performance. • Two type of hybrid aerogels are successfully fabricated by in-situ growth and doping method. • CoFe@CA-D shows excellent iodine adsorption performance and the equilibrium adsorption capacity remained 91% after 5 cycles. [ABSTRACT FROM AUTHOR]