Activated carbon based on jengkol fruit shell at soaking times assisted pottasium hydroxide (KOH)activation by microwave has successfully been made, the ratio of carbon mass to KOH of 2:1. Thechemical activation soaking time was varied at 24 hours, 36 hours, and 48 hours. The aims of thisresearch was to study the effect of soaking time on the physical properties of activated carbon ofjengkol shell that represented by micro structure, surface area, adsorption, and chain structure ofactivared carbon. The micro structure pattens of samples were in semi-crystralline structure as thepresence of quite narrow 2 peaks at 2? : 22,994o and 42,102o representing the crystal orientation of(002) and (100). The highest of stack height (Lc) was produced from the sample with soaking times 24hours which was 1,773 nm, with surface area of 124,50 m2/g. The adsorption of methylen blue was ashigh as 99,569mg/g and chain stucture of activated carbon based on jengkol shell was obtainedfunction group of C-H, C-C, C=O, and C-O at wave number of 2943,43 cm-1, 2369,65 cm-1, 1612,56cm-1 and 1160,23 cm-,1 respectively.
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