1. Removal of chlorinated volatile organic compounds onto natural and Cu-modified zeolite: The role of chemical surface characteristics in the adsorption mechanism.
- Author
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Valdés, Héctor, Riquelme, Andrés L., Solar, Víctor A., Azzolina-Jury, Federico, and Thibault-Starzyk, Frédéric
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VOLATILE organic compounds , *BRONSTED acids , *ADSORPTION (Chemistry) , *MORDENITE , *ZEOLITES , *ADSORPTION capacity - Abstract
• Water adsorbed over new Lewis acid sites formed new Brønsted acid sites. • NZ-Cu increased the adsorption capacity toward VOC Cls compared to NZ. • Interactions of VOC Cls with acidic surface sites of NZ-Cu were identified by DRIFTS. • VOC Cl interacted with Brønsted acid sites, forming hydrogen bonding. In this study, the effect of chemical surface characteristics of natural and Cu-modified zeolite in the adsorption of chlorinated volatile organic compounds (VOC Cls) was investigated using infrared spectroscopy. A natural zeolite mainly composed of clinoptilolite and mordenite was used as a parent material. A succession of chemical and thermal treatments produced a Cu-modified natural zeolite (NZ-Cu) with higher adsorption properties toward the elimination of VOC Cls. The adsorption of VOC Cls onto NZ-Cu zeolite could be explained by a surface mechanism that comprises the interaction not only with Brønsted acid sites present on the original natural zeolite framework; but also with new Brønsted acid sites formed after the successive treatments. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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