Preparation Of Carbon Microsphere-Polyester Fiber Composite And Its Application In Wastewater Treatment

With the development of the times,the process of industrialization is also accelerating.The harmful heavy metal ion wastewater discharged from the production process and the biodegradable printing and dyeing wastewater are increasing day by day.Adsorption method is widely used in wastewater treatment due to its advantages of high efficiency,easy operation,low cost of materials and recycling.Carbon microspheres have a wide range of raw materials,most of which have special spherical morphology,large specific surface area and rich pore structure.They have broad application prospects in catalysis,adsorption and separation.However,most of the carbon microspheres used as adsorbents for wastewater treatment are powder or granular,which have the problems of small particle size,easy reunion,difficult separation,blocking equipment and high cost.On the other hand,waste polyester fabrics are abundant with good thermal property,mechanical property,stability and non-toxicity.They can be used as substrates to load carbon microspheres to solve the above problems.Therefore,a kind of environmentally friendly composite material was prepared,its physical and chemical properties were tested and characterized,and its adsorption applications were simulated.(1)Glucose carbon microspheres decorated Polyester fibers composites were prepared and their adsorption properties for metal ions were investigated.Their adsorption capacity for Pb(II)was mainly investigated.Polyester fibers decorated with glucose carbon microspheres were prepared by one-step hydrothermal method using acrylic acid as crosslinking agent.The original morphology of the polyester yarn was retained,and the carbon microspheres synthesized were evenly distributed on the surface of the polyester fibers with particle size ranging from 0.5 to 1.5 ?m.The total amount of acidic groups on the surface of composite fibers is 1.95 mmol/g,the maximum theoretical adsorption capacity of Pb(II)was 20.2 mg/g.The adsorption process basically reached equilibrium in 180 minutes,which fitted well with the pseudo-second-order kinetic equation,and the isothermal adsorption process was more in line with the Freundlich adsorption model.After regeneration with hydrochloric acid,the adsorbent can be recycled at least three times and has good adsorption effect.(2)The synthetic steps of Glucose carbon microspheres decorated Polyester fibers composites were improved,and the polyester fibers were saponified before hydrothermal treatment.Polyester fabrics were soaked in NaOH solution for saponification,and then carbonized with acrylic acid as coupling agent to synthesize glucose carbon microspheres @ polyester fiber composite by one-step hydrothermal carbonization.The results showed that there were some corrosion pits on the saponified fiber surface,which increased the roughness of the fiber surface and provided more attachment sites for the follow-up.After hydrothermal carbonization,the carbon microspheres on the surface of polyester fibers are more numerous and widely distributed,which are basically monodisperse.The pH PZC of composite material is 2.4,which can effectively treat acidic wastewater and selectively adsorb cationic dyes.The adsorption process of ST on composites accords with pseudo-second-order kinetic model,and fitted better with Langmuir isotherm equation.The maximum theoretical adsorption capacity is 35.48 mg/g.After 10 regeneration cycles,the dye removal rate of adsorbent is still more than 85%.(3)The magnetic carbon microspheres decorated polyester fibers composites were prepared and their dye adsorption properties were investigated.Magnetic carbon microspheres were synthesized hydrothermally from ferrous gluconate as a single carbon and iron source.After saponification and citric acid pretreatment,the polyester material was put into the suspension of magnetic carbon microspheres,and the composite was prepared by ultrasonic vibration.The results show that the magnetic carbon spheres coated with carbon layer Fe3O4 were successfully prepared and loaded on the surface of polyester fibers.Results showed the adsorption capacity of the composite to methylene blue can reach 30.3 mg/g at 293.15 K.In addition,the kinetic data showed that the pseudo-second-order kinetic adsorption model can accurately describe the adsorption behavior.The adsorption process conformed to the Langmuir adsorption isotherm model.Thermodynamic parameters data showed that the adsorption process is spontaneous endothermic reaction.After five cycles of adsorption,the composite still had 70% removal ability of methylene blue.