KAPASITAS ADSORPSI SERBUK NATA DE COCO (BACTERIAL SELLULOSE) TERHADAP ION Pb2+ MENGGUNAKAN METODE BATCH

The purpose of this research is determine adsorption capacity of nata de coco powder to the ion Pb2+. Nata de
coco is a cellulose derived from the fermentation of Acetobacter xylinum bacteria. Nata de coco powder is made
by mashed nata de coco then heated at 80oC, mashed and sifted up to 30-40 mesh size. Characterization
includes determination of moisture content, ash content, density and amount of iodine adsorbed. Optimum
contact time using batch method with time variation are 20, 40, and 60 minutes. The determination of the
capacity of adsorption using the isotherm pattern of Langmuir and Freundlich using variation concentrations
Pb2+ 15, 30, 45, and 60 ppm. Amount of adsorbed ion Pb2+ measured by using the Atomic Absorption
Spectrophotometry (AAS) at a maximum wavelength of Pb2+ that is 283 nm. The results showed that the
optimum time was reached at 60 minutes. Adsorption pattern approach to the Freundlich’s Isotherm models
with an adsorption capacity 2.34 mg/g