The agriculture shell wastes were carbothermally converted to magnetic activated carbon by a microwave-assisted decoration of iron oxide nanoparticles onto the shell surface. The influence of ternary catalytic mixtures, including zinc, iron II and III chlorides on the cationic dye adsorption efficiency was addressed by the composite impregnations onto the almond or walnut shell powders, explored to the carbonization. The efficiency was maximized by determination the proportions of used salts. The best results were obtained with loading FeCl₃ onto the walnut shell in which the proportion of salt was 50%. Although the load of magnetic particles onto the adsorbent normally lead to decrease in efficiency, the prepared powder exhibited the appropriate performance above 99%. It should be point out that the dye adsorption efficiency of magnetic activated carbons fabricated by carbothermal functionalization was 7–10% higher than those produced in the nitrogen atmosphere. The adsorbent displayed the nano-porous structure with average pore diameter about 2 nm, providing a surface area around 1000 m²·g⁻¹ for the removal of dye in a dynamic system. The maximum adsorption capacity was determined to be 130 mg·g⁻¹ in the neutral condition.

通过微波辅助将氧化铁纳米颗粒装饰到壳表面，将农业壳废料碳热转化为磁性活性炭。通过在杏仁或胡桃壳粉末上的复合浸渍，探讨了碳化对三元催化混合物（包括锌，铁的II型和III型氯化物）对阳离子染料吸附效率的影响。通过确定所用盐的比例可使效率最大化。加载FeCl ₃可获得最佳结果放在盐含量为50％的核桃壳上。尽管磁性颗粒在吸附剂上的负载通常会导致效率降低，但制得的粉末在99％以上仍具有适当的性能。应当指出，通过碳热官能化制备的磁性活性炭对染料的吸附效率比在氮气氛下所产生的吸附率高7-10％。吸附剂显示出具有约2 nm的平均孔径的纳米多孔结构，提供了约1000 m ² ·g ^-1的表面积用于动态系统中的染料去除。在中性条件下，最大吸附容量被确定为130mg·g ^-1。