Nanofiltration ability to remove copper oxide and silver nanoparticles: The role of surface charge and size

Serrão Sousa, Vânia; Santos, C.; Ribau Teixeira, Margarida

http://hdl.handle.net/10400.1/12069

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Authors

Serrão Sousa, Vânia

Santos, C.

Ribau Teixeira, Margarida

Abstract(s)

This work pretends to study the performance of nanofiltration (NF) membranes in the removal of copper oxide and silver nanoparticles (NPs) and evaluate the role of surface charge and size of the NPs on this performance. Results demonstrate that positive charged CuO NPs are adsorbed onto negatively charged NF membrane, whereas for the negatively charged Ag NPs the adsorption on the membrane surface is much lower. For CuO NPs, NF270 is very efficient and the main mechanism of removal seems to be adsorption. For Ag NPs, removals are low due to the hydrodynamic diameter of the NPs at this pH compared to the membrane cut-off (similar to 170 Da).