Fe₃O₄ Magnetic Composite Materials Preparation And Its Adsorption And Photocatalysis On Printing And Dyeing Wastewater Research

With the rapid development of materials science,magnetic composites are widely used in drug carrier,nuclear magnetic resonance imaging,disease targeted therapy and sample separation and purification because of its easy preparation,non-toxic and good biocompatibility and superparamagnetism.It is currently one of the most in-depth studies of the material.Magnetic composites are a kind of composites synthesized by physical and chemical methods with special properties and have synergistic effects.They are widely used in many interdisciplinary disciplines.In this paper,magnetic composites with special structures such as Fe₃O₄ / VER / EAPTs,Fe₃O₄ / SA / AC,Fe₃O₄ / VER / TiO₂ were prepared by different methods.The adsorption and photocatalytic properties of magnetic materials for simulated printing and dyeing wastewater were studied.The solution to the adsorption of photocatalytic degradation of printing and dyeing wastewater in the main issues is listed below:?1?adsorbents and photocatalyst difficult to recover,high economic costs.?2?low efficiency of adsorbent and photocatalysis,poor selectivity.The main contents of this thesis are as follows:1.Fe₃O₄ / VER composites were prepared by hydrothermal method.The Fe₃O₄ / VER / EAPTs composites were fabricated by EAPTs on the Fe₃O₄ / VER composites by polymerization and hydrolysis.X-ray diffraction?XRD?Fourier transform infrared spectroscopy?FT-IR?,projection electron microscopy?TEM?,scanning electron microscopy?SEM?and sample vibrating magnetometer?VSM?were used to characterize the structure,morphology,composition and magnetic properties of the samples.The results show that the specific surface area of Fe₃O₄ / VER / EAPTs composites is 19.05 m2 / g,and has good magnetic response characteristics,and the saturation magnetization is 28.9 emu / g,which has good recoverability.The optimum conditions for the adsorption of four heavy metals?Cu,Zn,Cr,Hg?were investigated.The results showed that the optimum conditions were pH = 5,time 180 min,temperature 298 K in adsorption of Cu,Zn,Cr and Hg.The maximum adsorption capacities of Cr and Hg were 1.775 mg / g,1.895 mg / g,2.980 mg / g and 15.685 mg / g,respectively.The maximum adsorption capacity of Hg showed that Fe₃O₄ / VER / EAPTs composite have adsorbents were highly adsorbed selectivity.Adsorption of four heavy metals by Fe₃O₄ / VER / EAPTs composite adsorbent Langmuir adsorption isothermal model and quasi-second-order kinetics model.2.SA / AC,Fe₃O₄ / SA,Fe₃O₄ / SA / AC composites were prepared by the method of blending and crosslinking polymerization.The films were characterized by XRD,VSM,TG and so on.Adsorption experiments showed that Fe₃O₄ / SA / AC2?AC addition amount 0.2 g?had the strongest adsorption capacity of methylene blue in solution,and its adsorption performance was mainly affected by the initial concentration,temperature,adsorption time and pH value of dye.The adsorption process is in accordance with Langmuir adsorption isothermal model and quasi-second order kinetic model.Fe₃O₄ / SA / AC has a strong saturation magnetization,adsorption is completed in the external magnetic field under the effect of recovery,easy to regenerate.3.Fe₃O₄ / VER / TiO₂ composite photocatalytic materials were prepared by sol-gel method on the basis of hydrothermal method.Fe₃O₄ / VER / Ti O₂ composite was obtained after calcination at 450 ? for 2 h.Composites.The results of TEM,BET,VSM showed that Fe₃O₄ / VER / TiO₂ had better specific surface area?80.50 m2 / g?and saturated magnetic strength?4.62 emu / g?.The photocatalytic activity of TiO₂ composite photocatalyst was prepared by photocatalytic degradation of methylene blue?MB?and methylene orange?MO?under Fe₃O₄ / VER / TiO₂ photocatalytic activity under UV irradiation were 60% and 57%,respectively,after 5 cycles of efficiency were 53% and 46%.In this paper,the preparation of magnetic composite materials and its adsorption photocatalysis of printing and dyeing wastewater showed that the magnetic composite had good adsorption photocatalytic performance and recyclable reproducibility.In addition,this study is expected to provide certain theoretical references in developing composite magnetic materials in the actual printing and dyeing wastewater treatment...