| Metal-organic framework?MOFs?complexes are an important class of advanced functional materials.Due to their large specific surface area,high porosity,controllable pore size,and rich functional sites,they are used in gas storage and separation,sustained release of drugs and heterogeneous catalysis have potential applications,which have attracted more and more attention of researchers.However,in practical applications,the problems of dispersion and stability still exist.Therefore,it is very important to study composite nanomaterials based on metal organic frameworks.Therefore,In this article we designed the following structures.Firstly,we prepared a magnetic composite catalyst by using Ag nanoparticle loaded in MIL-100?Fe?step by step,and characterized its structure by SEM,TEM and other testing methods.In addition,due to the good loading and dispersion of the Ag-NPs and the porous structure of the particles on the surface of the metal-organic framework,the catalyst has a good catalytic reduction effect on 4-NP,with a catalytic efficiency of 98%within 10 min,exhibiting excellent catalytic efficiency.And due to its good magnetic properties,it can be easily recycled and reused.After 5 times of recycling,the catalytic performance changes little.This design structure can reduce industrial costs and reduce environmental pollution,indicating its potential for industrial use.It is a considerable,efficient and convenient magnetic composite catalyst.Then,A three-dimensional?3D?MIL-100?Fe?/graphene hybrid aerogel?MG-HA?was fabricated via in situ decoration of graphene oxide with MIL-100?Fe?nanoparticles.The resulting MG-HA with interconnected pore structure was applied as both the adsorbent and the catalyst for the removal of methylene blue?MB?out of aqueous solutions.The result shows that the saturation adsorption capacity of the MG-HA was as high as 333.33 mg g-1,exceeding both the corresponding pristine graphene aerogel and MIL-100?Fe?nanoparticles.In the presence of hydrogen peroxide,MG-HA further exhibited the catalytic degradation ability.The dual functions achieved the synergistic effect leading to the quick and complete removal of MB.The benefit was revealed in the treatment of high concentration of pollutants without leaving the second pollution.The merit was intuitively demonstrated in the instant removal of MB through a model separation device in comparison of series of common absorbents.A feasible mathematic model was built based on the synergistic adsorption/catalysis process,which perfectly fitted the experimental data.Additionally,the MG-HA was able to retain 93.4%of its initial removal efficiency after 5 cycles of application.The macro-material body can be easily separated and reused without a time-consuming and high-cost recycling process.Finally,we prepared a composite aerogel with high dispersion,large specific surface area,and good pore structure by growing the self-assembled ZIF-8 as a zinc oxide precursor on the surface of graphene.On the one hand,we compared the structural features of Zn-G,N-G,ZG-HA?pa?,and ZG-HA?co?,thereby demonstrating the superiority of our structural design in microstructures.On the other hand,through the electro-catalytic hydrogen evolution reaction tests of different samples,including the determination of overpotential,the determination of Tafel curves and the test of cycle performance,ZG-HA?co?exhibits the best catalytic activity,overpotential.It is 154mV,and after 1000 cycles,the performance changes little,confirming the superiority of this solution. |
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