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1

Department of Chemical and Materials Engineering, and Center of Membrane Sciences, University of Kentucky, Lexington, KY 40506, USA

2

Department of Civil Engineering, University of Kentucky, Lexington, KY 40506, USA





*

Author to whom correspondence should be addressed.



Academic Editor: Scott M. Husson

Abstract Membranes are finding wide applications in various fields spanning biological, water, and energy areas. Synthesis of membranes to provide tunable flux, metal sorption, and catalysis has been done through pore functionalization of microfiltration MF type membranes with responsive behavior. This methodology provides an opportunity to improve synthetic membrane performance via polymer fabrication and surface modification. By optimizing the polymer coagulation conditions in phase inversion fabrication, spongy polyvinylidene fluoride PVDF membranes with high porosity and large internal pore volume were created in lab and full scale. This robust membrane shows a promising mechanical strength as well as high capacity for loading of adsorptive and catalytic materials. By applying surface modification techniques, synthetic membranes with different functionality carboxyl, amine, and nanoparticle-based were obtained. These functionalities provide an opportunity to fine-tune the membrane surface properties such as charge and reactivity. The incorporation of stimuli-responsive acrylic polymers polyacrylic acid or sodium polyacrylate in membrane pores also results in tunable pore size and ion-exchange capacity. This provides the added benefits of adjustable membrane permeability and metal capture efficiency. The equilibrium and dynamic binding capacity of these functionalized spongy membranes were studied via calcium ion-exchange. Iron-palladium catalytic nanoparticles were immobilized in the polymer matrix in order to perform the challenging degradation of the environmental pollutant trichloroethylene TCE. View Full-Text

Keywords: phase inversion; free radical polymerization; polyelectrolyte; water remediation phase inversion; free radical polymerization; polyelectrolyte; water remediation





Autor: Douglas M. Davenport 1, Minghui Gui 1, Lindell R. Ormsbee 2 and Dibakar Bhattacharyya 1,*

Fuente: http://mdpi.com/



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