The actual internal report describes the scientific entire activity of three years of a joint lab Italy-Mexico during the period 01 January, 2017 up to December 31, 2019. First of all, the project idea consists into an international collaboration in order to consolidate the skills of Italian- and Mexican work teams on non-pollutants separation systems for the waste-water purification arising, above-all, from the industrial systems. In the last 50 years, several new technologies for the substance's separation, generally called "membrane processes", have been extensively studied for the above- mentioned aims. These technologies use artificial membranes in order to promote the separation/purification/removal of contaminants according to the pore size of the membranes used and their chemical-physical and morphological characteristics. Such operations occur through separation processes based on the dimensions difference between membrane pores and size of contaminant species to be filtered/separated or through mechanisms of complex's formation and/or of charge repulsion with the aim of avoiding the passage through the membrane pores. Since the water can be treated and purified through such membranes processes, at the end, the proposal was addressed towards the study and preparation of flat solid asymmetric polymeric membranes with defined characteristics in terms of morphology (finger-like macro-voids), hydrophilic character, thermal and mechanical stability, etc. Such properties were tuned as a function of the separation process selected (ultrafiltration - UF). The pure PSF membranes were prepared and used as reference, in addition membranes containing particular additives (surfactant and ionic liquids) were developed in order to trigger or improve the desired properties. All of the developed membranes were jointly characterised with the Mexican partner in terms of in terms of XRD, water retention and dimensional analysis @rT and 60°C (application range for UF) into three spatial directions, Dinamo Mechanical Analysis-DMA, surface and cross- section SEM, contact angle measurements, BET for surface area determination, TGA-DSC for thermal stability definition, IR measurements, permeability tests to individuate flux properties and selectivity. In particular, the different characterization techniques have been devoted to the individuation of the asymmetry and suitable transversal morphology, to the optimization of the manufacturing, to the size, shape and pores/channels distribution and to the definition of the correlation between experimental parameters used and membranes morphology for final application. In these years of the activity and the actual report, the main aim has been the individuation of valid polymeric PSF membranes prototypes, with suitable properties, able to realize the industrial grade wastewater purification with recovering of contaminating species (above-all heavy metals such as Cr+3) using ultrafiltration processes and with a high efficiency. In this context, the complete optimisation of the membrane's preparation procedure for each kind of the developed membrane (pure PSF, with surfactant and with CYPHOS), as well as their characterisation. Encouraging results were obtained and several samples were individuated as valid prototypes to be used in the UF field for the project application.
A. Saccà, R. Pedicini, A. Carbone, F.V. Matera, I. Gatto, M. Avila-Rodriguez, M. Pilar Gonzalez-Munoz, Yair Gutierrez Pina, Melisa Barrera Lopez, Sofia Galilea Quiroz Yebra, L. Espitia-Villanueva, S. Gutierrez-Granados, L. Hernandez-Perales, I. Olvera, A. Razo-Lazcano Teresa, Final Project Report. Period: January 01, 2017 - December 31, 2019. Lab. Congiunti Bilaterali Intern. del CNR, tematico ICT (triennio 2017-2019). Prot. N. 0082227. Gennaio 2020, Rapp. Int. 02/2020
R Pedicini;A Carbone;
2020
Abstract
The actual internal report describes the scientific entire activity of three years of a joint lab Italy-Mexico during the period 01 January, 2017 up to December 31, 2019. First of all, the project idea consists into an international collaboration in order to consolidate the skills of Italian- and Mexican work teams on non-pollutants separation systems for the waste-water purification arising, above-all, from the industrial systems. In the last 50 years, several new technologies for the substance's separation, generally called "membrane processes", have been extensively studied for the above- mentioned aims. These technologies use artificial membranes in order to promote the separation/purification/removal of contaminants according to the pore size of the membranes used and their chemical-physical and morphological characteristics. Such operations occur through separation processes based on the dimensions difference between membrane pores and size of contaminant species to be filtered/separated or through mechanisms of complex's formation and/or of charge repulsion with the aim of avoiding the passage through the membrane pores. Since the water can be treated and purified through such membranes processes, at the end, the proposal was addressed towards the study and preparation of flat solid asymmetric polymeric membranes with defined characteristics in terms of morphology (finger-like macro-voids), hydrophilic character, thermal and mechanical stability, etc. Such properties were tuned as a function of the separation process selected (ultrafiltration - UF). The pure PSF membranes were prepared and used as reference, in addition membranes containing particular additives (surfactant and ionic liquids) were developed in order to trigger or improve the desired properties. All of the developed membranes were jointly characterised with the Mexican partner in terms of in terms of XRD, water retention and dimensional analysis @rT and 60°C (application range for UF) into three spatial directions, Dinamo Mechanical Analysis-DMA, surface and cross- section SEM, contact angle measurements, BET for surface area determination, TGA-DSC for thermal stability definition, IR measurements, permeability tests to individuate flux properties and selectivity. In particular, the different characterization techniques have been devoted to the individuation of the asymmetry and suitable transversal morphology, to the optimization of the manufacturing, to the size, shape and pores/channels distribution and to the definition of the correlation between experimental parameters used and membranes morphology for final application. In these years of the activity and the actual report, the main aim has been the individuation of valid polymeric PSF membranes prototypes, with suitable properties, able to realize the industrial grade wastewater purification with recovering of contaminating species (above-all heavy metals such as Cr+3) using ultrafiltration processes and with a high efficiency. In this context, the complete optimisation of the membrane's preparation procedure for each kind of the developed membrane (pure PSF, with surfactant and with CYPHOS), as well as their characterisation. Encouraging results were obtained and several samples were individuated as valid prototypes to be used in the UF field for the project application.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
