Sulfur Pigments Synthesized from Zeolite LTA under Vacuum and in Air. XRD and Spectroscopic (UV−vis, FTIR, Raman, ESR, ESE) Characterization

X-ray, UV−vis, FT-infrared, Raman, continuous wave, and pulsed ESR spectroscopy were applied to characterize pigments prepared at 500 °C under vacuum or in air from mixtures of zeolite A (LTA) with sulfur (40 wt %) and anhydrous sodium sulfide (Na2/S = 0.1−0.4). The samples maintained the LTA struct...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2010-09, Vol.49 (17), p.8192-8199
Main Authors: Hoffmann, Stanisław K, Goslar, Janina, Lijewski, Stefan, Olejniczak, Iwona, Jankowska, Aldona, Werbińska, Anna, Kowalak, Stanisław
Format: Article
Language:English
Subjects:
Materials and Interfaces
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Summary:X-ray, UV−vis, FT-infrared, Raman, continuous wave, and pulsed ESR spectroscopy were applied to characterize pigments prepared at 500 °C under vacuum or in air from mixtures of zeolite A (LTA) with sulfur (40 wt %) and anhydrous sodium sulfide (Na2/S = 0.1−0.4). The samples maintained the LTA structure. Sample color results from an S3 − absorption band and the shoulder of a UV band. The fingerprint and asymmetric stretch region of the IR spectra show that the pigments synthesized in air have more disordered structures. The S2 −/S3 −ratio was estimated from Raman spectra. The ESR spectra of S3 − radicals show the existence of several phases visible as five different ESR components. Two components dominate: ideal [Na4S3 −]3+ clusters and clusters existing in a disordered environment. The samples synthesized in air show a substantial distortion of local structure. Synthesis in vacuum leads to products containing about 20% of the ordered crystalline phase.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie100983m