Microwave absorption properties of porous activated carbon-based palm oil empty fruit bunch

The increased growth of electronics and wireless communication systems causes the urge to find microwave absorbing materials that are lightweight, inexpensive, environmentally friendly. In this study, we successfully synthesize activated carbon from oil palm empty fruit bunch (OPEFB) as future material candidates with a porous structure using different kalium hydroxide (KOH) concentrations during activation process followed by physical carbonization at 800 °C under an inert atmosphere. prepared (PAC)-based OPEFB was characterized several techniques, including x-ray diffraction, scanning electronic microscopy-energy dispersive analysis, Brunauer–Emmett–Teller analysis. absorption properties PAC-based were measured one port rectangular waveguides X-band frequency range (from 8 12 GHz). A minimum reflection loss value −32.21 dB (more than 99.9% absorption) 10.64 GHz is obtained for 20% KOH concentration. SEM observations confirm carbon, BET analysis measures surface area concentration about 693.06 m2/g. improvement compared its raw attributed better impedance matching, multiple reflections occur in carbon. This study suggests can become potential absorbers used communications devices.