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Title: MODIFIED CLINOPTILOLITE AS PRECURSOR FOR FORMATION OF SILVER NANOPARTICLES-ZEOLITE NANOCOMPOSITES
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MODIFIED CLINOPTILOLITE AS PRECURSOR FOR FORMATION OF SILVER NANOPARTICLES-ZEOLITE NANOCOMPOSITES
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1314-2704
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English
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20
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6.1
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Purified natural clinoptilolite as well as clinoptilolite converted into hydrogen and sodium form have been contacted with 0.1 mol/L silver nitrate solution at a ratio solid to liquid equal to 1 to 20, in order to load silver ions (Ag+) on the zeolite support. It has been found that sodium modified clinoptilolite exchanged in highest degree Ag+ ions, followed by natural zeolite. Preliminary transformation of natural clinoptilolite into hydrogen form leads to decreasing of zeolite ability to bind Ag+ ions. The kinetics and thermodynamics of Ag+ ions uptake by zeolite have been studied. It has been found that the uptake process is best described by the pseudo-second order kinetic equation for the three studied materials. Fitting the experimental data to the isotherms' equations has shown that the Langmuir isotherm best described the loading of Ag+ ions on the three investigated zeolites. Nanocomposites ''silver nanoparticles-zeolite'' have been successfully formed by heating the Ag+-loaded zeolites at temperature 400 oC for 2 hours in air. The obtained materials have been characterized by X-ray diffraction, BET, SEM and EDS analyses. The current study has revealed that the chemical composition and morphology of synthesized nanocomposites are influenced by the modified form of clinoptilolite.
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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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77-84
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18 - 24 August, 2020
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website
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cdrom
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7519
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Ag+ ions adsorption; kinetics; silver nanoparticles-zeolite composite
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