Composite inorganic matrix modified with ion-exchanger nanoparticles

Abstract

The aim of the work was to elucidate a nature of charge-selective properties of macroporous composite inorganic membranes modified with nanoparticles of the ionexchanger, namely hydrated zirconium dioxide. The membrane was found to be selective towards anions in acidic media: membrane potential was registered in the solutions containing 10-100 mol m-3 HCl. Overlapping of intraporous diffusion constituents of electric double layer cannot be provided under these conditions. The membranes have been investigated using methods of standard contact porometry, potentiometry, scanning electron microscopy. The method of transmission electron microscopy was used to research individual ion-exchanger as well as ceramic powder, which had been obtained by crumbling up of the non-modified ceramic matrix. Differential curves of volume and surface distribution have been factorized using Lorentz functions, each maximum has been related to either structure element both of the matrix and the ion-exchanger. Calculations according to homogeneous and heterogeneous geometrical models were carried out to make this relation. Structure of the ceramic matrix has been shown to be formed with particles of micron size. Particles of the ion-exchanger (6 nm) form aggregates. It was found that the empties between the aggregates of ion-exchanger nanoparticles are responsible for charge selectivity because the aggregates cork pores of the matrix. Maximal radius of pores caused by the aggregates has been estimated as 25 nm. This is in agreement with porometric data. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20582