Study on Cu(Ⅱ)Removal Properties of Sulfide Nano Zero-valent Iron Composites
Sulfide nano zero-valent iron(S-nZVI)and its composites are famous for their excellent performance in removing heavy metals,but the high preparation cost greatly limits the development and application of S-nZVI.In this work,S-nZVI@Ma nanocomposites were prepared by fluidizing phase reaction using Na2S2O4 as a single reducing agent.S-nZVI@Ma was characterized by means of SEM,TEM,EDS,XPS,XRD,FTIR and VSM.The removal effect of S-nZVI@Ma on Cu(Ⅱ)from simulated wastewater was studied.The results show that S-nZVI@Ma can efficiently remove more than 99％Cu(Ⅱ)from the simulated waste liquid and can be separated from the simulated waste liquid by external magnet.After 5 times of reuse,the removal rate of Cu(Ⅱ)by S-nZVI@Ma remained above 75％,indicating that the material has good magnetic recycling performance.The removal process of Cu(Ⅱ)conforms to the quasi-second-order kinetic model and the Langmuir isothermal adsorption model,and the maximum capacity(qmax)is 71.43 mg·g-1.Thermodynamic studies show that the removal process is spontaneous and endothermic.The reactants were characterized by FESEM-EDS,XRD,XPS and FTIR,and the reaction mechanism was discussed from the point of view of electron transfer.The above research can provide reference for the practical application of S-nZVI.
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