نبذة مختصرة : The activated carbon of palm oil stem waste has been prepared by activation of ultrasonic waves. The carbonization process was carried out at a temperature of 250oC for 75 minutes. Activation with 42 KHz ultrasonic waves for 20 minutes was able to increase the iodine number value from 317,275 mg / g to 794,133 mg / g which meets the Indonesian National Standard NO 06-3730-1995, namely 750 mg / g. The optimum activated carbon was characterized using a FTIR spectrophotometer. The adsorption results showed that they were able to absorb Rhodamine B dye at an optimum concentration of 250 mg / L. The study of the adsorption isotherm is the Langmuir isotherm, which produces a correlation coefficient value close to one (R2 = 0.9985) with a maximum absorption capacity of 4.537 mg / g. FTIR spectra results show that there is a functional group –OH at wave number 3077.61 cm-1 shifted to 3079.30 cm-1, C = C at wave number 1590.29 cm-1 shifted to 1591.14 cm-1, and CO at the wave number 1212.42 cm-1 it shifted to 1216.83 cm-1 and the carbon characteristics test met the SNI 06-3730-1995 standards.
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