Modified bentonites as adsorbents of hydrogen sulfide gases

Carbonate-rich bentonite was modified by iron and copper chlorides in order to synthesize effective and cheap adsorbents for neutralization of H 2S in low-concentrated exhaust gases. Bentonite and modified bentonite were analysed using atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), s...

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Bibliographic Details
Published in:Applied clay science 2009, Vol.42 (3), p.625-628
Main Authors: Stepova, Kateryna V., Maquarrie, Duncan J., Krip, Ihor M.
Format: Article
Language:English
Subjects:
Adsorption
Copper
Earth sciences
Earth, ocean, space
Exact sciences and technology
Hydrogen sulfide
Iron
Mineralogy
Modified bentonite
Silicates
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Summary:Carbonate-rich bentonite was modified by iron and copper chlorides in order to synthesize effective and cheap adsorbents for neutralization of H 2S in low-concentrated exhaust gases. Bentonite and modified bentonite were analysed using atomic absorption spectroscopy (AAS), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and BET surface area analysis. In addition, bentonite and modified bentonite were tested as hydrogen sulfide adsorbents. Iron-containing material showed a significant improvement in the capacity for H 2S removal. The longest time of effective protective action (before H 2S appears on the outlet of the column) was obtained for the bentonite modified with copper hydroxide. The results indicated that on the surface of modified samples hydrogen sulfide reacts with metal hydroxide forming sulfides. Sulfided iron-containing sample could be regenerated by exposing it to the air.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2008.05.001