Research on effects of loading methods on magnetic biochar properties
Nano-Fe3O4-loaded biochar(magnetic biochar)has the characteristics of rich surface functional groups,medium and large pores,superparamagnetism,high electrical conductivity and alka-linity.It is widely used in composting,sewage treatment,anaerobic digestion,soil remediation,and other fields.To explore the effect of loading methods on the properties of biochar loaded by nano-Fe3O4,biochar loaded by nano-Fe3O4 was prepared by chemical coprecipitation method(MBC1),sol-gel method(MBC2)and ball milling method(MBC3).The results showed that nano-Fe3O4 was floc-culent on the surface of MBC1,while it was clear and spherical on MBC2 and MBC3.Meanwhile,new functional groups(Fe—O—C and Fe—O)appeared in biochar loaded by nano-Fe3O4,imparting magnetic properties.The magnetic saturation intensity of MBC1,MBC2 and MBC3 was 8.619×10-2,8.607×10-2,8.960×10-2 A·m2·g-1,respectively.Compared with biochar,the average pore size of nano-Fe3O4 loaded on biochar increased by 240％-330％,electrical conductivity increased by 17％-26％,and pH raised to 8-9.Among nano-Fe3O4 loaded on biochar prepared by three methods,the crystallinity of MBC1-Fe3O4 was the lowest,and the dispersion of MBC3-Fe3O4 was the highest.This study provides a reference for the preparation of biochar loaded by nano-Fe3O4 and the influence of loading methods.
Magnetic biocharChemical coprecipitation methodLiquid-phase reduction methodSol-gel methodBall milling method
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