Removal of sulfamethoxazole by nanofiltration membrane |
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Authors: | Su-hua Wu Hua-qiang Chu Bing-zhi Dong Jun-ru Zhou Yu Huang |
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Institution: | (1) School of Engineering, The University of Edinburgh, Edinburgh, EH9 3JL, United Kingdom |
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Abstract: | The retention of sulfamethoxazole (SMZ) by nanofiltration (NF) membranes is strongly influenced by the pH value of the solution.
The retention of SMZ reaches its peak value when the solution pH rises above its pK
a2 value as the compound transforms into a negatively charged species. Charge repulsion is the main mechanism involved in SMZ
removal by NF membranes. In this study, the removal of SMZ by NF membranes, as a function of solution chemistry, was examined
at pH 8.9 to investigate the effect of solution conditions on charge repulsion. The results show that the retention of negatively
charged SMZ is relatively independent of SMZ concentration, and an increase in the ionic strength of the solution causes a
relatively small reduction in retention. A small effect of humic acid (HA) on SMZ retention was noticed at pH 8.9, which can
be explained by a small but insignificant improvement in the zeta potential of the membrane caused by HA at high pH values.
However, it was found that SMZ concentration in the feed decreased significantly in solutions containing tannic acid (TA).
The Adams-Bohart model was applied to our experimental data and was found to be suitable for describing the initial part of
the breakthrough curves. The adsorptive parameters of the membrane were determined. |
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