Sediment-Water Interactions of Bisphenol A Under Simulated Marine Conditions
2009
Tian, Chong | Wang, Jiang-tao | Song, Xing-liang
The sorption behavior of bisphenol A (BPA) on marine sediments treated using different methods was investigated in batch equilibrium experiments. Adsorption isotherms were well fitted to Freundlich model and the model parameters, K F and n, had been evaluated. When temperature decreased from 308 to 288 K, Freundlich constant (K F) increased about 200%. K F increased by approximately 92.6% with increase of salinity from 1:2 artificial seawater (1:2 ASW) to ASW conditions. The plateau sorption capacity was around 0.8579 mg/g in the pH range 7.46-8.34, whereas the adsorption capacity decreased from 0.8579 to 0 mg/g when pH from 8.34 to 8.91, suggesting that the undissociated species were adsorbed more readily and that electrostatic repulsion may inhibit sorption as pH increases. The increase of K F value between the two media from natural seawater to ASW was around 25.3%, indicating the presence of dissolved organic matter appeared to have a significant effect on sorption. Mineral surface of sediment, together with microporosity of sediment, showed to be primarily responsible for the sorption of BPA.
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