Study On Preparation And Properties Of Environmental Functional Materials Based On MOFs

With the growth of the global population and the rapid development of industrialization,the numerous organic pollutants such as aromatic compounds,textile dyes,and pharmaceutical antibiotics have been discharged into the water environment and caused serious water pollutions.However,these organic wastewaters have the characteristics of stable structure,high toxicity,and difficult to degrade,and pose a huge threat to human health and the global environment.In addition,fresh water resources are seriously scarce due to water pollution problems caused by the massive discharge of organic wastewater.Therefore,it is urgent to develop effective and economical water treatment technology to produce pure water and make it recycled and reused has become a new hotspot in domestic and foreign.Metal-organic frameworks?MOFs?as a highly crystalline porous material,because of its high surface area,adjustable pore structure,and many physical properties such as numerous active sites,make it a new type of catalytic material for removing organic pollutants.At present,many new methods for preparing MOFs composite materials and their applications have been reported,but they are hampered by the processability,water stability and recyclability of MOFs,large-scale preparation,and sustainable and industrial applications.Therefore,new MOFs functional materials prepared by combining MOFs with other carrier materials or materials that are easily functionalized devices will be conducive to improving performance and expanding its application range.The purpose of this study is to design and synthesize two kinds of catalytic materials with high catalytic activity by using metal-organic framework materials as precursors,and the organic dyes in dyeing wastewater and tetracycline antibiotics in pharmaceutical wastewater as research objects to evaluate their catalytic performance.The research contents and results are as follows:1.Preparation and properties of N,O-doped magnetic porous carbon supported Au nanoparticle catalysts derived from MOFs modified pine needlesIn this study,pine needles were used as biomass precursor to fabricate N,O-doped magnetic porous carbon frameworks?PN-MPC?after modification with metal-organic frameworks?MOFs?and carbonization.Besides,N,O-doped magnetic porous carbon materials embedded with Au nanoparticles?Au/PN-MPC?were prepared by a facile two-step route composing of impregnation and subsequent thermal reduction procedures.It is meaningful that the Au/PN-MPC materials exhibited excellent adsorption efficiency as well as remarkable catalytic performance,and the removal efficiency of tetracycline?TC?in aqueous solution can reach 96%within 20 min.More importantly,the resultant Au/PN-MPC materials have good long-term stability due to the N and O functional groups on the surface of the carbon material can improve the stability and dispersibility of the metal active components.Overall,this novel biomass-derived magnetic porous carbon material embedded with Au nanoparticles has very promising application prospects in the field of environmental remediation.2.In-situ growth of MOFs on 3D printed hierarchical ceramic frameworks and their catalytic performanceCombination of porous catalyst carriers and high-performance catalysts has attracted increasing attention due to their efficient,reusable and durable characteristics in water purification.A simple hydrothermal treatment was used to obtain three dimensional?3D?printed hierarchical porous ceramic catalysts with in-situ load metal-organic frameworks?MOFs?.The resultant 3D printed hierarchical porous catalysts are capable to rapidly decompose organic dyes in aqueous solution based on Fenton reaction,and the corresponding removal efficiency and dye degradation rate?k?can reach up to 99.68%and 0.2915 min^-1,respectively.Moreover,its catalytic degradation rates are much greater than the other conventional MOFs-based heterogeneous Fenton catalysts.Exceptionally outstanding catalytic degradation efficiency of this material towards organic dyes is ascribed to their large surface area and numerous active sites in the interconnected porous networks.Also,the 3D-printed hierarchical porous catalysts demonstrate high degradation efficiency?>75%?over 50 reusable cycles that have potential for the green remediation in contaminated water.More importantly,two types of catalytic reactor,namely 3D printed catalytic filter and 3D printed impeller agitator,have been successfully manufactured by combining 3D printing technique and in-situ MOFs growth strategy.This strategy not only is able to complex and efficient multiscale porous 3D catalysts,but also presents considerable application prospects in the aspects of structural design,porosity regulation and water treatment functional devices.