Magnetic Nano-ferromanganese Oxides Modified Biochar Derived From Pine Sawdust For Adsorption Of Tetracycline Hydrochloride

With the continuous development of science and technology and the continuous progress of industrial production,it is often accompanied by the production of a large number of pollutants,these pollutants discharge,transport,scattered in the natural environment,will bring great harm to the environment and human beings.Among them,antibiotics have become a worldwide environmental pollution problem because of their large use,poor maternal absorption capacity,great potential harm,easy to produce antibiotic resistance genes and so on.In the current treatment methods,adsorption method has the advantages of simple operation,good effect and low economic cost,so it is widely used at present.The key of adsorption is the selection of adsorbents,and biochar is a kind of adsorbents which have been studied more and more at present.In this study,a new type of composite material,namely Modified Biochar(MBC),was synthesized by loading the magnetic ferromanganese oxides nanoparticles on pine biochar.It is then used to remove tetracycline from the water.The main results are based on the following results:(1)A new composite adsorptive material MBC,was obtained by the combination of magnetic nano-Fe-Mn oxide and pine biochar by solution impregnation and tube furnace pyrolysis.BET,SEM and FTIR were employed to analyze the surface properties and pore structures of MBC.In addition,XRD were adopted to examine the crystal structure of MBC.Characterization results showed that the surface area and porosity of MBC have been greatly improved,and the functional groups have been introduced by ferromanganese oxides.(2)The MBC prepared above is used to adsorb pollutants in water.The target of this experiment is tetracycline hydrochloride(TC).Adsorption experiments of tetracycline hydrochloride(TC)including kinetics,isotherms,thermodynamics as well as the influence of pH,salt ion strength and the environmental risk of MBC were evaluated.The results revealed that the experimental data conformed to the pseudo second-order kinetics model and the Freundlich isotherm model.In the adsorption process,MBC showed excellent adsorption ability(maximum capacity for TC 100.74(mg/g)to BC(33.76 mg/g).In isotherm experiments,the maximum adsorption capacity of TC by MBC reached 177.71 mg/g.Toxicity studies showed that the MBChad no harm to the environment.To conclude,MBC has great potential for applications in removing TC from water.