Abstract:
Ripe jackfruit peel waste from the production of jackfruit chips which is still a lot of waste
and has not been used optimally. Jackfruit peel waste has been used as an adsorbent by
several researchers and to increase its adsorption ability an activation process was carried
out with NaOH and continued with modification using Ca-alginate. This study aims to
determine the best surface area of jackfruit peel powder through activation with various
concentrations of NaOH and analyze the optimal adsorption efficiency of the modified
adsorbent with the parameters of the adsorbent dose and contact time in absorbing
methylene blue. Jackfruit peel waste powder was activated using various concentrations of
NaOH, namely 0.05 M, 0.1 M, 0.2 M, 0.3 M. Determination of surface area was carried out
by measuring with UV-Vis spectrophotometer and obtained non-activated surface area was
better than with that which is activated is 43,837 m2.g-1 so that the adsorbent modified
with Ca-alginate is a non-activated adsorbent. From the modification of the non-activated
adsorbent with Ca-alginate, the optimum dose of modification occurred at a mass of 1.4 g
with an adsorption efficiency of 90.04% and the optimum contact time occurred at 90
minutes with an adsorption efficiency of 92.43%. From the results, it can be concluded that
NaOH is not suitable for activation of the analyzed jackfruit peel powder samples and the
optimal modification absorption efficiency was obtained at 92.43% at a dose of 1.4g with a
contact time of 90 minutes.
