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| Influence of solution chemistry on the interaction forces between membranes and carboxyl groups |
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Abstract To further clarify the effects of pH and ionic strength on the interaction forces between typical membrane materials and the carboxyl group, which is a typical functional group of membrane foulants, the interaction forces between the PVDF or EVOH membrane and carboxyl group were measured by atomic force microscopy in conjunction with a self-made carboxyl colloidal probe. Results show that the PVDF-carboxyl and EVOH-carboxyl adhesion forces weakened with increasing pH, whereas they firstly increased and then decreased with an increase in ionic strength. The interaction forces between membranes and carboxyl groups increased with an increase at low ionic strength (0~10mmol/L). However, the forces decreased with an increase at high ionic strength (10~500mmol/L). Moreover, the PVDF-carboxyl adhesion force was much stronger than the EVOH-carboxyl interaction force for given solution conditions.
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Received: 23 September 2014
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