土壤对双酚A的吸附性能研究

采用平衡吸附法研究了内分泌干扰物双酚A(BPA)在3种土壤表面的吸附动力学和等温吸附特性,同时考察了土水比对BPA吸附的影响,结合傅里叶变换红外光谱仪(FTIR)初步探讨了BPA在土壤表面的结合机制。结果表明,土壤对BPA的吸附率随着土壤用量的增加而逐渐增加,当土水比为1∶10时达到平衡。土壤对BPA的吸附分为快吸附和慢吸附2个过程,二级动力学方程能较好地描述吸附过程。土壤对BPA的吸附符合Langmuir方程。FTIR图谱显示,氢键作用参与了土壤对BPA的吸附。

Sorption Behaviors of Bisphenol A on Soil Samples

Batch adsorption experiments of bisphenol A (BPA) were performed using three soil samples. A series of kinetic, isotherm and the effects of the dosage of soil on the adsorption of BPA were studied. Combined with Fourier transform in-frared spectrometer (FTIR), the mechanism of the adsorption of BPA on the surface of soil was discussed preliminarily. The results showed that the adsorption rate of BPA gradually increased with the increase of the dosage of soil, and it final-ly tended to be stable when the ratio of soil and water was 1:10. The adsorption process was divided into fast adsorption and slow adsorption, and pesudo-second-order equation could well describe the adsorption process. The adsorption of BPA fitted Langmuir isotherm equation well. The FTIR results indicated that the hydrogen bonding involved in the adsorption of BPA on soil.