EFISIENSI PENYERAPAN BUBUK LIMBAH KULIT NANGKA YANG DIMODIFIKASI DENGAN Ca-ALGINAT SEBAGAI ADSORBEN METILEN BIRU

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.