Preparation of NH2-MOF-199@Viscose Spunlaced Composite Nonwoven Material and Adsorption Performance for Organic Dyestuffs
NH2-MOF-199,a kind of metal-organic framework materials,was synthesized on the surface of viscose spunlaced nonwoven material(NH2-MOF-199@VSN)via in situ solvothermal method to obtain NH2-MOF-199@viscose spunlaced composite nonwoven material(VSN).Then NH2-MOF-199@VSNC was prepared by high-temperature calcination of NH2-MOF-199@VSN at 200 ℃.The results show that NH2-MOF-199 crystal particles with a regular octahedral structure are uniformly and compactly immobilized on the surface of VSN.After being calcinated at high temperature,some small holes and cracks appear on the surface of NH2-MOF-199.Compared with VSN and NH2-MOF-199@VSN,NH2-MOF-199@VSNC has the best adsorption capacity for methylene blue(MB)in aqueous solution.The adsorption efficiency of NH2-MOF-199@VSNC for MB reaches the maximum of 98.42％when the temperature of adsorption solution is 30 ℃ and the pH value is 7.After being repeatedly used five cycles,the adsorption efficiency of NH2-MOF-199@VSNC for MB still maintains about 65.76％.The MB adsorption process of NH2-MOF-199@VSNC is a heat-absorbing,entropy-increasing and spontaneous process.Compared with the quasi-first-order adsorption kinetics model,the adsorption process is more suitable to be described by the quasi-second-order adsorption kinetics model,indicating that the MB adsorption process of NH2-MOF-199@VSNC is dominated by chemical adsorption and accompanied by physical adsorption.
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