Abstract
A permeable system composed of a polyelectrolyte complex (PEC) membrane formed by alternated deposition of chitosan (CHI) and carboxymethylcellulose (CMC) onto a porous solid substrate was investigated. The films, with thicknesses not superior to 20 nm, were obtained by a self-assembly technique, i.e., by direct dipping of chemically cleaned porous glass membranes, into concentrated polymeric precursor solutions. The resulting depositions have irregular structures and reduce the initial membrane permeability, especially for higher flux velocities. Concerning filtration tests for herbicide removal in aqueous medium, the chitosan deposition attained better results. A tentative model of binding involving hydrogen bonding and/or charge-transfer to nonspecific sites available dynamically as a function of the conformational estate of the deposited polymers is proposed for polysaccharide-herbicide interactions.
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