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Effect of Acid on Natural Zeolite Dealumination on Indigo Carmine Adsorption Capability

Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Indonesia

Published: 30 Apr 2018.
Open Access Copyright 2018 Jurnal Kimia Sains dan Aplikasi under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract
Modifying natural zeolite with dealumination using H2SO4 and HCl, and its application to adsorb indigo carmine has been performed. Dealumination was carried out by reacting a natural zeolite with a mixture of KMnO4-H2SO4 and a mixture of KMnO4-HCl then refluxed for 5 hours followed by washing with demineralized water until a neutral pH was obtained and dried for 12 hours at 80°C. Dealuminated zeolites were then characterized by XRD, FTIR and Si/Al ratio measurements. Dealuminated zeolite was then used to adsorb indigo carmine in a batch-shaker system for 30 min with concentration variation XRD diffraction shows that natural zeolite and dealuminated zeolite contain modernit minerals. Dealumination increased the Si/Al ratio from 0.935 to 2.075 and 7.912 which meant that dealumination was successful. The indigo carmine adsorption result showed that zeolite adsorption capacity II> zeolite I> natural zeolite. FTIR data showed that there was no change of zeolite structure before and after adsorption
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Keywords: zeolite; dealumination; H2SO4; HCl; adsorption; indigo carmine

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Last update: 2024-03-27 13:39:04

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