双酚A在湘江沉积物上的吸附特征

 探讨了双酚A(BPA)在湘江沉积物上的吸附/解吸特征.结果表明,BPA在湘江沉积物上的吸附主要以快速吸附为主,Freundlich模型能较好地描述其吸附等温线,沉积物有机质中的碳黑物质和孔隙填充相引起了BPA的非线性吸附和解吸滞后行为;沉积物对BPA的吸附是一个放热过程,主要是自发的焓推动的物理吸附;随着沉积物浓度的增大,单位沉积物上的BPA吸附量减少;随着离子强度的增大,单位吸附量也随之增大;在酸性条件下,单位沉积物上的BPA吸附量随着pH值的增大而减少,在碱性条件下这种影响不显著.

Sorption characteristics of bisphenol A on Xiangjiang River sediments

The sorption/desorption characteristics of bisphenol A (BPA) on Xiangjiang River sediments was investigated. The rapid sorption played the main role in the sorption of BPA on the Xiangjiang River sediments and Freundlich model could describe preferably the sorption isotherms. The black carbon substance and hole-filling looks of the organic substances in sediment induced the behaviors of nonlinear sorption and desorption hysteresis of BPA. The sediment sorption of BPA was an exothermic process, mainly attribute to the physical sorption driven by spontaneous enthalpy. The amount of adsorbed BPA on unit sediment decreased with increase of sediment concentration; and it increased with an increase of ionic strength. Under acidic condition, the amount of adsorbed BPA on the unit sediment decreased with pH value increase; whereas this influence was not marked under alkaline condition.