School of Energy and Environment, Shenyang Aerospace University

生物炭负载纳米Fe3O4颗粒(磁性生物炭)具有结构稳定、芳香化程度高、官能团丰富、孔隙发达、超顺磁性、导电性高等特点,其在堆肥、污水处理、厌氧消化、土壤修复等领域应用广泛。为探究不同负载方法对生物炭负载纳米Fe3O4颗粒性质的影响,本研究分别通过化学共沉淀法(MBC1)、溶胶凝胶法(MBC2)、球磨法(MBC3)制备了生物炭负载纳米Fe3O4颗粒。结果表明,纳米Fe3O4在MBC1表面呈现絮状,而在MBC2和MBC3表面呈现清晰球状。同时,生物炭负载纳米Fe3O4颗粒都出现了新的官能团(Fe—O—C和Fe—O),具有超顺磁性,磁饱和强度分别为8.619×10-2、8.607×10-2、8.960×10-2A·m2·g-1。相比于生物炭,生物炭负载纳米Fe3O4颗粒的平均孔径增大了240%~330%,电导率提高了17%~26%,pH升至8~9。在3种方法制备的生物炭负载纳米Fe3O4中,MBC1的结晶度最差,MBC3的分散性最好。为生物炭负载纳米Fe3O4颗粒的制备及负载方法对其性质影响提供借鉴。

Nano-Fe O -loaded biochar ( magnetic biochar) has the characteristics of rich surfacefunctional groups, medium and large pores, superparamagnetism, high electrical conductivity and alka⁃linity. It is widely used in composting, sewage treatment, anaerobic digestion, soil remediation, andother fields. To explore the effect of loading methods on the properties of biochar loaded by nano-FeO, biochar loaded by nano-FeO was prepared by chemical coprecipitation method (MBC1), sol-gel method (MBC2) and ball milling method (MBC3). The results showed that nano-FeO was floc⁃culent on the surface of MBC1, while it was clear and spherical on MBC2 and MBC3. Meanwhile, newfunctional groups ( Fe—O—C and Fe—O) appeared in biochar loaded by nano -FeO, impartingmagnetic properties. The magnetic saturation intensity of MBC1, MBC2 and MBC3 was 8.619×10,8.607×10, 8.960×10 A·m·g, respectively. Compared with biochar, the average pore size ofnano-FeO loaded on biochar increased by 240%-330%, electrical conductivity increased by 17%-26%, and pH raised to 8-9. Among nano-FeO loaded on biochar prepared by three methods, thecrystallinity of MBC1-FeO was the lowest, and the dispersion of MBC3-FeO was the highest. Thisstudy provides a reference for the preparation of biochar loaded by nano-FeO and the influence ofloading methods.

沈阳市科技计划社会治理科技专项资助项目(2-322-3-16);辽宁省科技厅应用基础研究计划资助项目(2023JH2/101600010)

孔天岐,王涵,张万里.负载方法对磁性生物炭特性的影响[J].能源环境保护,2024,38(5):157-165.

KONG Tianqi, WANG Han, ZHANG Wanli. Research on effects of loading methods on magnetic biochar proper⁃ties[J]. Energy Environmental Protection, 2024, 38(5): 157-165.