Abstract:
This study aims to determine the surface area of the best jackfruit seed powder through
activation with various concentrations of HCl (0.1 M, 0.2 M, 0.3 M and 0.4 M) and
analyze the optimal adsorption efficiency of adsorbents that have been modified with Caalginate
on the parameters of adsorbent mass and contact time in absorbing methylene
blue. The modified adsorbent before and after contact was analyzed using SEM and FTIR
instruments. Determination of the surface area was carried out by measuring with UVVis
spectrophotometer and obtained the best surface area of HCl activated adsorbent at a
concentration of 0.3 M with a surface area obtained of 8.3359 m 2 .g-1, then the adsorbent
modified with Ca-alginate is activated adsorbent of 0.3 M HCl. From the modified
adsorbent activated with Ca-alginate, the optimum dose of modification occurs at a mass
of 3 g with an adsorption efficiency of 74.78% and time optimum contact occurred at 90
minutes with adsorption efficiency of 78.63%. From the results of the study, it can be
concluded that the adsorbent of jackfruit seeds activated by HCl modified with Caalginate
has the potential to adsorb methylene blue.
