The present project (Start date: 07 February 2013) aims to investigate, for the first time by in situ time-resolved X-ray powder diffraction, the structural modifications and the desorption kinetics during the thermal regeneration of synthetic zeolites used for removal of non-polar organic compounds from contaminated waters. Co-proposer: Giuseppe Cruciani and Luisa Pasti, University of Ferrara. The project was approved (2012/2/2) and financed by the international Commitees of EUROPEAN SYNCHROTRON RADIATION FACILITY (CH-3510, 9 shifts allocated). The aim was to study the structural and kinetic response to heating of zeolite ZSM-5 after adsorption of 1,2-dichloroethane (DCE), methyl tert-butyl-ether (MTBE), toluene (TOL) and of a mixtures of these contaminants from aqueous dilute solutions. Powder diffraction data have been collected (as a function of time, both in temperature ramp and isotherm modes in order to obtain information on: i) evolution of the zeolite crystal structure (relocation of extra-framework species and symmetry modifications); ii) site selective kinetic parameters of desorption process. Both kind of information are crucial to design and optimize the regeneration treatment of zeolites with a very high potential for application in water remediation technologies.
"In situ XRD study of structural modifications and desorption kinetics of zeolites used for removal of non polar organic compounds from contaminated water"
MARTUCCI, Annalisa
2013
Abstract
The present project (Start date: 07 February 2013) aims to investigate, for the first time by in situ time-resolved X-ray powder diffraction, the structural modifications and the desorption kinetics during the thermal regeneration of synthetic zeolites used for removal of non-polar organic compounds from contaminated waters. Co-proposer: Giuseppe Cruciani and Luisa Pasti, University of Ferrara. The project was approved (2012/2/2) and financed by the international Commitees of EUROPEAN SYNCHROTRON RADIATION FACILITY (CH-3510, 9 shifts allocated). The aim was to study the structural and kinetic response to heating of zeolite ZSM-5 after adsorption of 1,2-dichloroethane (DCE), methyl tert-butyl-ether (MTBE), toluene (TOL) and of a mixtures of these contaminants from aqueous dilute solutions. Powder diffraction data have been collected (as a function of time, both in temperature ramp and isotherm modes in order to obtain information on: i) evolution of the zeolite crystal structure (relocation of extra-framework species and symmetry modifications); ii) site selective kinetic parameters of desorption process. Both kind of information are crucial to design and optimize the regeneration treatment of zeolites with a very high potential for application in water remediation technologies.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
