Title:
Optimization of Bioethanol Production from Durian Skin Using H₂SO₄-Activated Peanut Skin Adsorbent

Authors:
Marhaini, Ummi Kalsum, Heni Juniar, Indonesia

Abstract:

This study focuses on improving bioethanol yield through the adsorption-distillation technique, utilizing peanut skin as a natural adsorbent. Fermentation over a seven-day period resulted in the highest bioethanol concentration of 17%, with peak bacterial activity observed at a yeast concentration of 12.5%. The fermented bioethanol was then purified through a distillation process conducted at 80 °C, yielding an initial purity of 18%. Following this, the adsorption process was carried out using peanut skin activated with a 0.05 M H₂SO₄ solution. Adsorbent mass variations included 2 g, 4 g, 6 g, 8 g, and 10 g. The mixture of bioethanol and adsorbent was stirred and then separated to isolate the purified bioethanol. The bioethanol concentration was analyzed using a refractometer, based on refractive index measurements, and further validated by the GC-MS method. Results indicated that increasing the adsorbent mass positively influenced the bioethanol content, with the highest yield of 31% obtained using 10 g of adsorbent.

DOI: http://dx.doi.org/10.51505/ijaemr.2025.1409