Preparation And Properties Of Multi-functional Catalytic Materials Based On Metal-organic Frameworks

MOFs material is a kind of porous material with specific topological structure.ZIFs are representative and typical.ZIF-8 is a porous material with a SOD topology.The functional groups of ZIFs can be changed,which is not available in traditional inorganic porous materials,so the application scope is more extensive.ZIFs materials have broad application prospects in the fields of catalytic degradation,catalytic reaction,biosensor,gas adsorption and separation.This paper studies the synthesis and photoelectrocatalysis properties based on ZIF-8,ZIF-67,and explores the influencing factors that influence the photoelectric catalytic efficiency.The specific research contents are as follows:(1)ZIF-8@Z catalysts were successfully prepared by sonochemical synthesizing method using metal organic frameworks as precursors and zeolite A as support.Then,ZIF-8@Z catalysts were transformed into ZnO@Zeolite A(ZnO@Z)photocatalysts by calcining at different temperatures to remove the organic functional groups of ZIF-8.The photocatalysis of ZnO@Z was investigated by degradation of rhodamine B(RhB)aqueous solution under UV light and ZnO@Z exhibited rapider photodegradation of RhB than porous ZnO derived from ZIF-8.The degradation of RhB reveals that Zn0O@Z,calcined at 550 ℃ for 5 h,(ZnO@Z550)shows the highest photocatalytic efficiency(99.4%).(2)Cobalt-nickel phosphide/N-doped porous carbon polyhedron electrocatalysts(CoNiP/NC)were prepared by a facile two-step carbonization method and subsequent phosphorization calcination in an Ar atmosphere using cobalt-based zeolitic imidazolate frameworks(ZIFs)as precursors.Among the electrocatalysts obtained by controlling the carbonization and phosphorization temperature,the CoNiP/NC700 catalyst,where 700 refers to the calcination temperature(℃),exhibited superior electrocatalytic activity for the OER with an onset overpotential of approximate 220 mV and an overpotential of approximate 300 mV in alkaline solution at a current density of 10 mA/cm2.The CoNi/NC and Co/NC Samples were also tested for comparison and CoNiP/NC exhibited the better electrocatalytic activity at all the temperatures tested.The superior electrocatalytic activity of the phosphorization hybrid material can be attributed to the superior synergistic effect of Co,Ni,P and C due to their strong electron coupling interactions.The interconnected amorphous carbon anchored the active Co compounds to avoid aggregation and maintained conducting channels for electron transfer.