Desalination of aqueous solutions by LTA and MFI zeolite membranes using pervaporation method
AUTOR(ES)
Malekpour, A., Samadi-Maybodi, A., Sadati, M. R.
FONTE
Brazilian Journal of Chemical Engineering
DATA DE PUBLICAÇÃO
2011-12
RESUMO
LTA and MFI zeolite membranes were hydrothermally grown on the surface of an α-alumina porous support. The synthesized membranes were used for removal of cationic and anionic species from aqueous solutions by the pervaporation method. The perfection of the membranes was improved by employing the multi-stage synthesis method. The membranes were characterized by XRD, SEM and IR methods. The membranes were initially evaluated by the pervaporation separation of water from aqueous 2-propanol mixtures. The separation factors obtained were 7081 and 105 for NaA and ZSM-5 membranes, respectively. The ability of membranes for desalination of some aqueous solutions containing I-, Cs+ and Sr2+ ions was examined in various conditions. These ionic species were chosen because of their importance in the nuclear sciences. Both membranes effectively removed (more than 99 wt%) I-, Cs+ and Sr2+ from their singlesalt solutions (0.001mol dm-3) over a temperature range of 298-338 K. The effects of parameters such as time and temperature on the separation factors and fluxes were investigated. This work shows that, due to their excellent chemical, thermal and mechanical stability, the zeolitic membranes are useful for desalination of aqueous solutions and treating saline wastewaters by pervaporation. Therefore, this method has the ability to desalinate harsh environment solutions involving strong solvent and radioactive components.
Documentos Relacionados
- Extraction of cadmium from aqueous solutions by emulsion liquid membranes using a stirred transfer cell contactor
- Preparation of zeolite a coatings on copper plates by using the substrate heating method
- Ethyl oleate production by means of pervaporation-assisted esterification using heterogeneous catalysis
- Theoretical Studies of Concentrated Aqueous Urea Solutions Using Computacional Monte Carlo Simulation
- DENSITY CALCULATIONS OF AQUEOUS AMINE SOLUTIONS USING AN EXCESS GIBBS BASED MODEL