Zhang Yuting, Liu Min, Lin Li, Zhao Liangyuan, Deng Wei, Han Cheng, Wu Mingli
Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China.
Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Changjiang River Scientific Research Institute, Wuhan 430010, China.
Toxics. 2024 Jun 27;12(7):469. doi: 10.3390/toxics12070469.
Phthalic acid esters (PAEs), recognized as endocrine disruptors, are identified as predominant organic pollutants in the Three Gorges Reservoir (TGR). Di-n-butyl phthalate (DBP), a representative PAE, has been extensively studied for its sources, distribution and ecological risks. However, there are few studies on the adsorption of DBP by sediment from the TGR, and the adsorption characteristics of surface sediment on DBP are not clear. Therefore, based on the actual sediment contents and particle sizes in the TGR, the kinetics and isothermal adsorption characteristics of surface sediment on DBP were investigated in this study. The results showed that the equilibrium time was 120 min, the adsorption kinetics were more in line with the pseudo-second-order kinetic model, and the sediment in water from the Yangtze River exhibited a higher adsorption rate and maximum adsorption amount on DBP than that observed in deionized water. Additionally, a decrease in DBP adsorption was observed with increasing sediment content, while sediment particle size and specific surface area had a slight influence. Analysis using SEM, TGA and FTIR revealed that organic matter on the sediment surface significantly contributed to DBP adsorption. This study contributes valuable insights into the adsorption characteristics of DBP by the surface sediment from the TGR, providing a scientific foundation for understanding the migration and transformation of DBP in this critical reservoir in China.
邻苯二甲酸酯（PAEs）被认为是内分泌干扰物，是三峡水库（TGR）中主要的有机污染物。邻苯二甲酸二丁酯（DBP）作为一种具有代表性的PAE，其来源、分布和生态风险已得到广泛研究。然而，关于三峡水库沉积物对DBP的吸附研究较少，表层沉积物对DBP的吸附特性尚不明确。因此，本研究基于三峡水库实际的沉积物含量和粒径，对表层沉积物对DBP的吸附动力学和等温吸附特性进行了研究。结果表明，平衡时间为120分钟，吸附动力学更符合准二级动力学模型，长江水体中的沉积物对DBP的吸附速率和最大吸附量高于去离子水中的沉积物。此外，随着沉积物含量的增加，DBP吸附量下降，而沉积物粒径和比表面积的影响较小。通过扫描电子显微镜（SEM）、热重分析（TGA）和傅里叶变换红外光谱（FTIR）分析发现，沉积物表面的有机物对DBP吸附有显著贡献。本研究为三峡水库表层沉积物对DBP的吸附特性提供了有价值的见解，为理解DBP在中国这一关键水库中的迁移和转化提供了科学依据。
