Adsorption of Zinc by Using Combusted Palm Oil Kernel

The report is prepared to provide readers information regarding the ell.:periment of
adsorption of zinc by using combusted palm oil kernel. The presence of heavy metals in
water causes harm since they are classified as toxic. The objective of the experiment is to
establish the optimum adsorbent dosage, the optimum adsorption period for the
adsorption of zinc and the best adsorption isotherm model. The size of adsorbent was
R4251im. Zinc had been used during the experiment as heavy metals to be adsorbed by
the adsorbent. The adsorbent dosages used were 25, 50, 100, and 200 mg, 25, 50, 75, and
100 mg, and 1000, 2000, 3000, and 4000 mg. The combusted palm oil kernels were
supplied to every aqueous zinc solution sample. The concentrations were divided into
two which were 10 and 100 ppm. All samples were shaken by orbital shaker with four
different durations 1, 3, 6, and 24 hours. Only after the shaking processes completed, the
final concentrations of aqueous zinc solution were measured by using HACH DR2800
Spectrophotometer. In the first trial of phase 1 with initial concentration of 11.45 mg!L,
the optimum adsorbent dosage was 2000mg/L and the optimum adsorption period was 24
hours. In the second trial of phase 1 with initial concentration of 240mg/L, the optimum
adsorbent dosage was 2000 mg/L and the optimum adsorption period was 24 hours. In
the second trial of phase 1 with initial concentration of 141.33 mg/L, the optimum
adsorbent dosage was 1000 mg!L and the optimum adsorption period was 6 hours. In the
first trial of phase 2 with initial concentration of 10 mg/L, the optimum adsorbent dosage
was 2000 mg/L and the optimum adsorption period was 3 hours. In the first trial of phase
2 with the initial concentration of 110 mg/L, the optimum adsorbent dosage was 2000
mg/L and the optimum adsorption period was 24 hours. In the seeond trial of phase 2
with the initial concentration of 10 mg!L, the optimum adsorption period was 6 hours and
the optimum adsorbent dosage was 40000 mg/L. In conclusion, the higher the adsorbent
dosage was used, the higher the percentage removal. A good plot of the adsorption
isotherm depended on the degree of consistency of the adsorption model.