Based On Magnetosphere Preparing Sorbent And Adsorption Of Copper Bearing Wastewater

In recent years, Chinese ecological environment has been greatly affected with the rapid development of national economy. Environment pollution and resource exhaustion have become the two most crucial factors restricting the sustainable development of Chinese economy and society. There are two key measures to solve this restriction:one is harmlessness of industrial by-product, another is recycling use of waste resource. Coal plays a major role in China’s energy consumption. As a result, tremendous amount of coal fly ash is produced every year from coal burning. Currently, the reported fly ash utilization rate in China is no more than 70%. In addition, most of the utilizations are simple, primary, and bring very low additional value. Therefore, it is important to research on non-hazardous treatment and high-value utilization of fly ash, which can not only solve related environmental pollution problem, but also improve the advanced application of fly ash.The heavy metal pollution has been become serious with the development of related industries. In this thesis, several advanced utilizations of fly ash magnetosphere (FAMS) were developed and applied in treating copper polluted wastewater. The adsorption and surface properties of FAMS were tuned by physical and chemical modification methods. The microstructure, composition of phase, magnetism, and copper adsorption property of the obtained magnetosphere sorbents were carefully studied. The main research results are listed as follows:1. The main separation method of fly ash magnetosphere (FAMS) is wet-magnetic separation by using tubular magnetic extractor. Three different magnetic fields (100mT,200mT,300mT) were set for fine magnetic separation of fly ash.2. Since fly ash magnetosphere (FAMS) composition comprise aluminum silicate mineral, alkali modification method was employed to enhance the specific surface of magnetosphere. In order to optimize the preparation of magnetosphere sorbent, orthogonal experiment were designed for three influencing factor that including magnetic-field intensity, conductivity of lye, speed of stirring, and the property of optimized magnetosphere sorbent were characterized with SEM, XRD, VSM. The orthogonal experiment results indicated the optimal preparation condition of magnetosphere sorbent as follows:300mT of magnetic separation intensity,3mol/L of the concentration of NaOH aqueous solution,200r/min of mixing speed. The material characterization results indicated that the optimal magnetosphere sorbent with multi-aperture material structure, typical of ferromagnetic hysteresis,14.58mg/g of copper ion adsorption capacity.3. Owing to its good selective adsorption to Cu ions, Chitosan was selected as basic sorbent to fabricate a shell-core structural composite magnetosphere, with FAMS as core. Two different composite magnetosphere sorbents were prepared by inverse suspension method and gel-solidification method, respectively. The properties of two different composite magnetosphere sorbents were characterized with SEM, XRD, VSM, IR, respectively. The material characterization results indicated that the phase of sorbent which prepared by gel-solidification method were comprised of magnesium, magnetite, quartz and chitosan,-NH2,-OH Functional group were loaded on the surface of microsphere,27.98mg/g of copper ion adsorption capacity. For the sorbent which prepared by inverse suspension method, the material characterization results indicated that the phase of sorbent were comprised of magnesium, magnetite, quartz and chitosan,-NH2,-OH Functional group were loaded on the surface of microsphere,46.46mg/g of copper ion adsorption capacity.