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Zhao C, Zhang Z, Deng Q, Song G, Wu Y, Zhang H, Li X, Ma X, Tan B, Yin Y, Jiang Q. Adsorption of deoxynivalenol by APTS-TEOS modified eggshell powder. Food Chem 2022; 391:133259. [DOI: 10.1016/j.foodchem.2022.133259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 11/28/2022]
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Wang H, Schwieger W, Huang Y. An investigation of the conformational behavior of a chlorinated hydrocarbon, 1,1,2-trichloroethane, adsorbed in zeolites by Raman spectroscopy. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The conformational behavior of 1,1,2-trichloroethane (TCE) adsorbed in two representative zeolites (silicalite-1 and zeolite L) was investigated by Fourier transform (FT)-Raman spectroscopy in combination with thermogravimetric analysis (TGA) and powder X-ray diffraction (XRD). The results indicate that the conformational properties of the TCE molecules inside a zeolitic host are strongly influenced by both the framework topology and the existence of charge balancing cations. When TCE is adsorbed inside completely siliceous silicalite-1, the population of the trans conformer increases significantly relative to pure liquid. Adsorption of TCE also induces a phase transition from the monoclinic to orthorhombic crystal system in the framework of silicalite-1 at high loading levels. At low loading, the TCE molecules are adsorbed inside the channels of silicalite-1. When at high loading levels, TCE molecules reside at both the channel intersection as well as the midsection of the channels. For zeolite L, the presence of an extra-framework cation shows a strong influence on TCE conformation. The strong interaction of the cation with the large dipole moment of the gauche isomer leads to a large increase in the gauche population. Raman data provide direct evidence that the cations in the framework interact much more strongly with the gauche isomer than the trans isomer.
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Affiliation(s)
- Haiyan Wang
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
| | - Wilhelm Schwieger
- Department of Chemical and Bioengineering, Friedrich-Alexander Universität Erlangen-Nürnberg
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada
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