Preparation of Microwave Absorbing Nickel-based Activated Carbon by Electroless Plating with Palladium Free Activation

摘要

Nickel-based active carbon was prepared from coconut shell active carbon by electroless plating with palladium-free activation. The materials were characterized by scanning electron microscopy (SEM), X-ray energy dispersion spectroscopy (EDS), vibrating sample magnetometry (VSM), and vector network analyzer, respectively. The results show that the surface of the active carbon was covered by a Ni-P coating, which was uniform, compact and continuous and had an obvious metallic sheen. The content of P and Ni was 2.73% and 97.27%, respectively. Compared with the untreated activated carbon, the real permeabilityμ′ and imaginary permeability μ″ of Ni-based active carbon became greater, whereas the real permittivity ε′ and imaginary permittivity ε″ became smaller. Also, the plated active carbon was magnetic, making it suitable for some special applications. In general, the method reported here might be a feasible procedure to coat active carbon with other magnetic metals, which may find application in various areas.