Preparation Of Metal-organic Framework (Cu-BTC) And Its Application In The Development Of Functional Polyester Fiber

With the development of science and technology and improvement of living standards of people,functional textiles have been more and more popular in textile industry,and developing new functional textiles is one of the hot topics in recent years.According to the recently research,metal-organic frameworks（MOFs）have good applications in the fields of adsorption,separation and catalysis due to its rich nanoporous structure and high specific surface area.The application of metal-organic framework in textiles industry will have broad prospects.In the present work,copper-metal organic framework（Cu-BTC）was synthesized in the hydrothermal solution.The effect of surfactant on the particle size of Cu-BTC was studied.Cu-BTC was grown in situ on the alkali reduction polyester fiber surface by hydrothermal growth and step-by-step growth methods to prepare Cu-BTC/polyester fiber composite.The specific research contents and results are as follows:At first,Cu-BTC was prepared and its properties were characterized.Cu-BTC was prepared in hydrothermal solution by using copper nitrate trihydrate（Cu（NO₃）₂·3H₂O）as the metal copper source,trimesic acid（H₃BTC）as the organic ligands and surfactant as particle size regulator.The effect of surfactant on the particle size of Cu-BTC was investigated.The structure and properties of Cu-BTC were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,Fourier Transform Infrared Spectrometer（FT-IR）and Brunner-Emmet-Teller（BET）measurements.The results showed that the nonionic surfactant PVP had the best effect to control the particle size of Cu-BTC among the chosen surfactants,and the average particle size of Cu-BTC reached the minimum of 2.4μm when the concentration of PVP was 1.4×10^-44 mol/L.As a result,Cu-BTC prepared by adding PVP showed small particle size,stable crystal structure,uniform morphology and presented increased BET property and adsorption amount of N₂ than the normal one.Secondly,Cu-BTC/polyester fiber composite was prepared by direct hydrothermal growth and its properties were measured.Alkali-reduced polyester was used as carrier while PVP was used as particle size regulator in hydrothermal solution.The effect of PVP on the particle size and morphology of Cu-BTC on the polyester fiber surface was investigated,as well as the effects of the weight loss of polyester and the immersion solution of copper nitrate(n_Cu（NO3）2)on the Cu-BTC fixation rate.The structure and properties of the composite were characterized by XRD,FT-IR,thermogravimetric analysis（TG）,BET,and the washing fastness and formaldehyde adsorption of the composite were also tested.The results showed that the particle size of Cu-BTC on the fiber surface was reduced and the morphology was more regular after the addition of PVP to the hydrothermal solution,while the alkali treatment of polyester can improve the adhesion of Cu-BTC on the fiber surface.The fixation rate increased with the increasing of n_Cu（NO3）2,and eventually the fixation rate reached a constant value of 26.3%when the particle size was 2-3μm.The prepared Cu-BTC/polyester fiber composite had good thermal stability,high specific surface area and good adsorption performance to formaldehyde,but the washing fastness was poor.In the third part,Cu-BTC/polyester fiber composite was prepared by step-by-step growth.The alkali-reduced polyester was cyclically immersed in the copper nitrate solution and trimesic acid solution to prepare Cu-BTC/polyester fiber composite.The effects of the number of immersion cycles and the amount of material in the immersion solution on the particle size and fixation rate of Cu-BTC were investigated.The structure and properties of Cu-BTC/polyester fiber composite were characterized and analyzed by XRD,FT-IR and BET,as well as the washing fastness and adsorption of formaldehyde.The results showed that the fixation rate of Cu-BTC increased along with the number of cycles,while the particle size and the fixation rate of Cu-BTC on polyester were decreased along with the amount of material in the immersion solution.When n_Cu（NO3）2=1 mmol,n_H3BTC=0.5 mmol,the immersion cycle number of 60times,the fixation rate of Cu-BTC on the polyester fiber reached 34.2%and the particle size was about 2μm.The prepared Cu-BTC/polyester fiber composite had good washing fastness,specific surface area and the adsorption performance were obviously improved compared with the hydrothermal method.All the results showed that the surfactant PVP can effectively reduce the particle size of Cu-BTC.Cu-BTC/polyester fiber composite can be prepared by hydrothermal growth and step-by-step growth methods,while the alkali reduction of polyester fiber can improve the loading of Cu-BTC.Cu-BTC/polyester fiber composite prepared by step-by-step growth method had higher BET,adsorption properties and better washing fastness compared to the hydrothermal method.