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研究报告

黄晓妍,裴志国,罗磊,张爱佳,刘彦霞,秦菲,可欣,张庆华.双酚S在两种典型地带性土壤中的吸附/解吸行为研究[J].环境科学学报,2020,40(4):1452-1459

摘要：采用批平衡实验方法研究了双酚S（BPS）在两种典型地带性土壤中的吸附/解吸行为.结果表明，吸附动力学曲线符合拟二级动力学方程.吸附等温线呈非线性，且同时符合Freundlich和Langmuir方程.相比而言，BPS更易吸附在高有机质含量的黑土中，298 K反应温度下BPS在黑土和红壤上的最大吸附容量分别为497.8和156.6 mg·kg^-1.吸附到两种土壤中的BPS存在解吸滞后现象，这可能是由于BPS以化学吸附和微孔扩散的形式存在于土壤中的缘故.溶液pH与BPS在土壤中的吸附容量呈负相关关系，即中性形态的BPS比阴离子形态的BPS具有更高的吸附容量.与结构类似物双酚A（BPA）的吸附相比，BPS在土壤中的吸附量更低，因此具有更高的迁移能力，可能会引起更高的环境健康风险.本研究结果为了解BPS在土壤中的迁移规律提供了数据支持.

Abstract：In this study, the sorption and desorption of bisphenol (BPS) in two typical zonal soils were investigated using a batch equilibration method. The kinetics data of BPS in two soils were best described with the pseudo-second-order model. The sorption isotherms were nonlinear and the equilibrium data were well fitted by both Freundlich and Langmuir models. BPS was more easily sorbed in black soil than red soil, where the maximum sorption capacities of BPS in black soil and red soil at T=298 K were 497.8 and 156.6 mg·kg^-1, respectively. Chemical sorption and micropore diffusion were the main sorption mechanisms, which led to the desorption hysteresis of BPS from two soils. The sorption of BPS in two soils was strongly dependent on solution pH, and neutral BPS had much stronger sorption ability in two soils than its anionic species. In comparison with bisphenol A, BPS exhibited a lower sorption capacity in two soils. Findings in this work provide data support for understanding BPS migration in soils.