PEMBUATAN MORTAR SEMEN-ZEOLIT ALAM DAN UJI ADSORPSI DESORPSI-NYA TERHADAP AIR DAN ETANOL; FABRICATION OF NATURAL ZEOLITE-CEMENT MORTAR AND ADSORPTION-DESORPTION TEST OF WATER AND ETHANOL
Wolo, Daniel, Yateman Arryanto
2015 | Disertasi | FMIPA UGMThe aim of this study was to yield a mortar plate with hydrophilic property and a good compressive strength in order to selectively separate a mixture of ethanol/water. The mortar composite was made by mixing cement with natural zeolite (1:1) using water as media, and a cement additive was added as substance to increase its hardness. Several composites were also made with various water volumes, particle sizes of natural zeolite, and the quantities of additive substance, and were characterized using infrared (IR) spectrometer, and x-ray diffraction (XRD) spectrometer. Besides compressive strength, their adsorption and desorption capacity and time were examined by recording time needed to adsorb and desorb, while dropping some amounts of water on each natural zeolite/cement composite plate. These tests were repeated by replacing water with ethanol. The result of IR and XRD analysis confirmed that prepared composites were different from their constituent materials. The IR data showed some hydroxyl groups, which indicated there was a hydration reaction of cement or pozzolanic reaction between cement/zeolite and calcium hydroxide. From those reactions, some products such as calcium sulfate hydrous, calcium hydroxide, and calcium silicate hydrate (CSH), were produced. This was confirmed as well by XRD data. In addition, different particle size, water content, and quantity of additive increased the strength of composite mortal from 50.84 MPa to 113.38 MPa. Beside that, the time measurement data of adsorption-desorption showed that water was adsorbed faster than ethanol, but it’s desorption took place at a much slower rate than that of ethanol. Consequently, pervaporation technique (with no heat applied) was carried out to separate ethanol from the mixture of water-ethanol, which (IR) brought up the concentration of ethanol from 70% to 80%.
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