| Summary: | The utilization of natural zeolite as an adsorbent has taken much attention, especially on its ability for bioethanol purification. However, the purification of bioethanol using micro-size zeolite-based adsorbent only resulted in an insignificant increase in bioethanol concentration. Finding a new technique that can improve bioethanol concentration is quite needed. A necessary correlation between surface area and diameter size of the particle could be an excellent way to resolve this issue. The objective of this study was to prepare natural zeolite nanoparticles obtained from Pahae District using a technique so-called high energy milling (HEM) and to investigate its effectiveness for improving the concentration of bioethanol. In this study, unmilled zeolite of 44 microns size (325 mesh), was used as a comparison. The result of PSA and BET confirmed the advancement of HEM technique for obtaining nano-zeolite, which improved the surface area of the particle, but on the other hand, reduced the pore volume and diameter. The comparison material showed that it has a greater porosity than the prepared nano-zeolite. Gas chromatography analysis showed that nano-zeolite was able to be used to improve the concentration of bioethanol. This study concluded that zeolite-based adsorbent, which has nanosized, gave a more reliable result than the micro-size due to the enhancement of the surface area of the particle. © 2021, Rasayan Journal of Chemistry, c/o Dr. Pratima Sharma. All rights reserved.
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