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Effect of Acid on Natural Zeolite Dealumination on Indigo Carmine Adsorption Capability
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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
Institute of Research and Community Services Diponegoro University (LPPM UNDIP)
Title: Effect of Acid on Natural Zeolite Dealumination on Indigo Carmine Adsorption Capability
Description:
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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