PROSES BIOSORPSI DAN DESORPSI ION Cr(VI) PADA BIOSORBEN RUMPUT LAUT Eucheuma spinosum

Abstract

Studies on biosorption and desorption of chromium (VI) on seaweed (Eucheuma spinosum) biosorben have
been carried out. These studies included determination of biosorben acidity, optimum pH, contact time of
biosorption, isoterm and biosorption capacity, and mechanisms of interaction between chromium (VI) and seaweed
(Eucheuma spinosum) biosorben. Mechanisms of interaction were known with desorption chromium (VI) on
seaweed biosorben using aquades, 1 M HCl and 0,05 M Na2EDTA.
The result showed that the total acidity of seaweed biosorben was 4,1545 ± 0,3290 mmol/g, the optimum pH
was 5, and the contact time was 120 minute. Biosorption capacity of seaweed (Eucheuma spinosum) to chromium
(VI) was 13,4992 mg/g. The highest desorption of chromium (VI) occurred with the use of aquadest which was
40,69%. Whereas desorption using 1 M HCl and 0,05 M Na2EDTA were 4,84% and 0,20% respectively. This case
indicated that the main interaction mechanism of chromium (VI) on seaweed was hydrogen and Van der Waals bond
which was relatively weak.