Preparation Of Magnetic Adsorption Materials And Application Of Dyeing Wastewater Treatment

Dyes are widely used as colorants in industries such as textiles,paper,food,printing,leather and plastics,but many dyes are toxic,carcinogenic and mutagenic,and with the rapid development of the printing and dyeing industry,the problem of water pollution is very prominent which has seriously jeopardized the ecological environment of the water body and threatens the health of human beings,therefore printing and dyeing wastewater must be disposed of before being discharged.Among disposing methods,the adsorption method with the advantages of low energy consumption,high adsorption capacity and environmental friendliness,is considered as an effective method for removing dyes from dissolved printing and dyeing wastewater,and in the past few decades,activated carbon as adsorbent has been widely used in wastewater treatment because of its low cost and high adsorption efficiency,however how to effectively and quickly separate the adsorbent from printing and dyeing wastewater is an urgent problem to be solved.Part I: Preparation and adsorption properties of ferromagnetic activated carbon adsorption materialsIn this chapter,melamine(MEL)and urea(CN)used as nitrogen sources,ferric chloride as magnetic material precursor,and activated carbon(AC)precursor of adsorption material,Ferromagnetic activated carbon adsorption materials are synthesized by one-step high temperature treatment.The effects of heat treatment temperature and the content of each component on the magnetic properties of the composite,especially the saturation magnetization and adsorption properties are investigated.The adsorption of methylene blue(MB)and acid blue 80(AB80)solutions in printing and dyeing wastewater is used as a model to investigate the effects of adsorption temperature,pH value,amount of adsorbent and type of modifier on the adsorption properties of composites.The results show that the saturation magnetization of the composite is much higher than that of the magnetic material precursor,and it has good magnetic separability and maintains the excellent adsorption properties of the carbon material components.At the same time,the kinetic behavior of the adsorption process of adsorbent materials is also studied,and the adsorption kinetics model is established.Part II: Preparation and adsorption properties of iron-cobalt magnetic activated carbon adsorption materialsBased on the work of the previous chapter,this chapter obtains the iron-cobalt magnetic adsorbent by a one-step high temperature treatment method by adding cobalt chloride to the reaction system.The effects of heat treatment temperature and the content of each component on the magnetic properties of the composite,especially the saturation magnetization and adsorption properties are investigated.The adsorption of the methylene blue solution in the artificial simulated wastewater is studied by using the prepared adsorbent material as model to investigate the effects of adsorption temperature,pH value of the solution,the amount of adsorbent and the type of modifier on the adsorption performance of the composite.The results show that by introducing cobalt ions into the ferromagnetic activated carbon adsorption material,the saturation magnetization of the prepared adsorbent is much higher than that of the magnetic material precursor,and under the premise of the saturation magnetization of the ferromagnetic adsorbent be basically maintained,it also has good magnetic separability,but its specific surface area is much larger than that of the ferromagnetic adsorbent material,which makes the synthesized adsorbent have better adsorption performance.Therefore,the composite material prepared by this method is an adsorbent material which has excellent adsorption properties and can be magnetically recovered.In addition,the kinetic behavior of the adsorption process of adsorbent materials is also studied in this experiment,and the adsorption kinetics model is established.Part III: Preparation and adsorption properties of iron-zinc magnetic activated carbon adsorption materialsOn the basis of the first part,zinc ions are introduced into the crystal lattice of the ferromagnetic activated carbon adsorption material to synthesize an iron-zinc magnetic activated carbon adsorption material to investigate the effects of synthesis reaction temperature and content of each component on the magnetic properties of composites,especially saturation magnetization and adsorption properties.The adsorption of methylene blue solution in artificial simulated wastewater studied by using composite materials is as model to investigate the effects of adsorption temperature,pH value of the solution,amount of adsorbent and type of modifier on the adsorption properties of the composites.The results show that although zinc ions are a kind of non-magnetic ions,the introduction of zinc ions can further change the distribution of cations in the lattice of ferromagnetic adsorbent materials,the saturation magnetization of the prepared composites is much higher than that of magnetic precursors,and the magnetization is slightly lower than that of the ferromagnetic activated carbon adsorbent,and it also has good magnetic separability,but its specific surface area is much larger than that of ferromagnetic activated carbon adsorbent and that of iron-cobalt magnetic activated carbon which gives it better adsorption properties.In addition,the kinetic behavior of the adsorption process of adsorbent materials is also studied in this experimente to establish the adsorption kinetics models.Part IV: Preparation and adsorption properties of iron-cobalt-zinc magnetic activated carbon adsorption materialsOn the basis of the second part,zinc ions are introduced into the crystal lattice of the iron-cobalt magnetic activated carbon adsorption material to synthesize the iron-cobalt-zinc magnetic activated carbon adsorption material to investigate the effects of synthesis reaction temperature and content of each component on the magnetic properties of composites,especially saturation magnetization and adsorption properties.That the adsorption of methylene blue solution in artificial simulated wastewater is carried out by adsorption material being model to investigate the effects of solvent temperature,pH value of the solution,amount of adsorbent and type of modifier on the adsorption activity of the composite.The results show that although zinc ion is a kind of non-magnetic ion,the introduction of zinc ion can further change the distribution of cations in the lattice of iron-cobalt magnetic adsorption material,the saturation magnetization of the prepared composite material is much higher than that of the magnetic material precursor,and the magnetization is slightly lower than the magnetization of the iron-cobalt magnetic adsorbent,and it also has good magnetic separability,but its specific surface area is much larger than that of the ferromagnetic adsorbent,that of the iron-cobalt magnetic adsorbent,and that of iron-zinc magnetic activated carbon adsorbent materials,which may lead to its good adsorption properties.In addition,the kinetic behavior of the adsorption process of adsorbent materials is also studied to establish the adsorption kinetics models.