Study On The Adsorption And Catalytic Performance Of Modified Polypropylene Non-woven Fabric Membrane On Sewage

With the acceleration of the industrialization process,the market demand of the textile industry continues to expand,and there is a large amount of difficultto-treat printing and dyeing textile wastewater in the ecological environment.In this paper,polypropylene non-woven fabric(PP)is used as the base material,and glycidyl methacrylate(GMA)is grafted by radiation grafting for pretreatment,and then amines and β-cyclodextrin are selected for GMA support.The epoxy groups of the chain were opened.PP-g-EDA@Ag/Cu,PP-g-DEA@Ag/Cu were prepared for catalytic reduction of 4-nitrophenol and PP-g-β CD was prepared for the adsorption of bisphenol A and other dyes.This paper mainly conducts research from the following three aspects:Firstly,the amino group can open the ring of the epoxy group of the GMA branch.We chose a convenient and environmentally friendly grafting method and reduction strategy to immobilize the bimetallic Ag-Cu nanoparticles on polypropylene(PP)on non-woven fabric.The prepared samples have been proved by various characterization methods,including FE-SEM,XRD,EDX,XPS and FT-IR.The samples we prepared showed excellent activity for the catalytic reduction of high concentrations of 4-NP and demonstrated the synergy between Ag and Cu nanoparticles.The entire catalytic reduction reaction was generally considered to obey pseudo-order kinetics,and even after 15 cycles,it still retains a highly efficient conversion rate.These conclusions show that the PP-based composite catalytic material with Ag-Cu nanoparticles supplies excellent catalytic efficiency and stability in the 4-nitrophenol reduction reaction,and it can be used in practical applications for the treatment of diverse waste water.Secondly,β-cyclodextrin has a large number of hydroxyl groups and the hydroxyl groups can also open the ring of GMA branched epoxy groups.The β-CD grafted PP-g-GMA fabric(PP-g-β CD)can be easily prepared by one-pot chemical ring opening.The characterization and performance of composite materials were measured by FTIR,SEM,water contact angle,zeta potential and other methods.The entire adsorption process reached equilibrium within 24 hours and followed a pseudo-second-order kinetic model.In the single adsorption system of BPA,the maximum fitted adsorption capacity reached 106.7058 mg/g.The experimental isotherm can be judged as the Langmuir model.Finally,we choose BPA with other dyes and heavy metal ions solution to form a binary adsorption system.Our adsorption materials still maintain excellent adsorption performance.In the regeneration test,we found that the results of treating PP-g-β CD fabric composite with a mixture of ethanol and acid behaved surprisingly.The above results show that our PP-g-β CD fabric composite material can be used as an environmentally friendly and sustainable adsorbent,which can be applied to single and complex sewage treatment.