• 关键词：竞争吸附  位点能量分布  苯酚  双酚A  沉积物

• 基金项目：陕西省自然科学基金-青年基金（No.2018JQ2025）

• 王雪平
• 1. 长安大学环境科学与工程学院, 西安 710054;2. 旱区地下水文与生态效应教育部重点实验室, 西安 710054

• 陈爱侠
• 1. 长安大学环境科学与工程学院, 西安 710054;2. 旱区地下水文与生态效应教育部重点实验室, 西安 710054

• 陈贝
• 长安大学海威环境技术公司, 西安 710054

• 孟建昊
• 1. 长安大学环境科学与工程学院, 西安 710054;2. 旱区地下水文与生态效应教育部重点实验室, 西安 710054

• 胡卫星
• 1. 长安大学环境科学与工程学院, 西安 710054;2. 旱区地下水文与生态效应教育部重点实验室, 西安 710054

• 摘要：河流水体和沉积物中酚类EDCs因其广泛存在和危害持久受到广泛关注，为研究自然条件下河流沉积物上多种酚类EDCs共存的吸附行为，本文以苯酚（phenol）和双酚A（bisphenol A，BPA）为目标污染物，灞河表层沉积物为吸附剂，通过静态吸附实验研究二者在单溶质和双溶质体系下的吸附等温特性，在此基础上，采用位点能量分布理论分析污染物之间的竞争吸附机理.结果表明，相同浓度（1~50 mg·L^-1）条件下，单溶质体系的苯酚吸附位点主要集中于高能量位；双酚A吸附位点主要分布于低能量区.双溶质体系下，相同浓度的两种物质位点分布函数均随着位点能量的增大而呈指数降低，苯酚下降趋势较为平缓，吸附位点分布更均匀.两种体系相比较，双溶质体系下苯酚平均位点能量和位点能量非均质性分别降低0.867%和3.473%，吸附位点数量降低1.230%；双酚A平均位点能量和位点能量非均质分别增大了6.074%和14.992%，吸附位点数量增大6.389%.即双溶质体系下，二者之间存在一定的竞争吸附，双酚A处于竞争优势.

• Abstract：Phenolic EDCs have been driving extensive research interests due to their prevalence and persistence in water and sediments. In this study, the static adsorption experiments, which contained single or dual species of phenol and bisphenol A (BPA) in the system, were carried out to characterize the isotherms of adsorption of the two pollutants on the surface sediments in Ba River. The theory of site energy distribution was employed to interpret the experimental data, so as to understand the mechanisms underlying the competitive adsorption of the two contaminants. In the system that contained the same concentration(1~50 mg·L^-1) of single contaminant, the adsorption sites of phenol were mainly in the high energy level, whereas the adsorption sites of bisphenol A were mainly in the low energy region. Compared to phenol, BPA had priority during the process of adsorption on sediments. In the system containing the same concentration (1~50 mg·L^-1)of dual contaminants, exponential decrease was found for the distribution functions of both substances with the increasing site energy. The decline trend of phenol was more moderate, and the distribution of adsorption sites was more homogeneous. When compared to the single-contaminant system, the average site energy and site energy heterogeneity of phenol in the dual-contaminant system decreased by 0.867% and 3.473%, respectively, and the number of adsorption sites decreased by 1.230%. When compared to the single-contaminant system, the average site energy and site energy heterogeneity of BPA increased by 6.074% and 14.992%, and the number of adsorption sites increased by 6.389%. The results suggest that there is competition between phenol and BPA during the process of adsorption on the sediments, and the bisphenol A was in an advantage position.

• Key words：competitive adsorption  site energy distribution  phenol  bisphenol A  sediments

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