School of Ecology and Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, PR China.
School of Ecology and Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, PR China; Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan, Henan 467036, PR China; Henan International Joint Laboratory of Water Cycle Simulation and Environmental Protection, Zhengzhou 450001, PR China; Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou 450001, PR China; Yellow River Institute for Ecological Protection and Regional Coordination Development, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan 450001, PR China.
Sci Total Environ. 2023 Sep 1;889:164242. doi: 10.1016/j.scitotenv.2023.164242. Epub 2023 May 16.
The increasing usage of household drugs has contributed to the widespread distribution of antibiotic pollutants in the aquatic environment. Although previous studies have proven that sediments could act as an important transport vector of antibiotic pollutants, the crucial impact of suspended sediments (SS) on the migration and fate of antibiotics in water bodies remains unclear. This study systematically investigated the performance and potential mechanism of adsorption of tetracycline (TC) on SS in the Yellow River. The results show that physisorption (pore filling, hydrogen bonding) and chemisorption (π-π interaction, surface complexation, and electrostatic interaction) activities contributed to the adsorption of TC onto SS. The mineral components (SiO, FeO, and AlO) of SS were found to be the main active sites for TC adsorption. The contribution of SiO, FeO, and AlO to the overall TC adsorption could reach up to 5.6 %, 0.4 %, and 73.3 %, respectively. Interestingly, the DFT results suggesting that SiO tends to form intermolecular hydrogen bonds with TC, while Fe-O and Al-O play predominant roles in TC adsorption on SS. The MIKE simulations showed that river temperature, initial pH, and SS concentration would significantly affect the concentration of dissolved TC during SS transport. In addition, the presence of humic acid and more acidic environments favored the adsorption of TC on SS. Conversely, the introduction of inorganic cations inhibited the adsorption of TC on SS. This study provides new insights into the adsorption mechanism and migration of antibiotics in rivers with high SS content.
家庭用药的日益普及导致抗生素污染物在水环境中广泛分布。尽管先前的研究已经证明沉积物可以作为抗生素污染物的重要传输载体，但悬浮沉积物 (SS) 对水体中抗生素迁移和归宿的关键影响仍不清楚。本研究系统研究了四环素 (TC) 在黄河 SS 上吸附的性能和潜在机制。结果表明，物理吸附（孔填充、氢键）和化学吸附（π-π 相互作用、表面络合和静电相互作用）活性促进了 TC 对 SS 的吸附。SS 的矿物成分（SiO、FeO 和 AlO）被发现是 TC 吸附的主要活性位点。SiO、FeO 和 AlO 对总 TC 吸附的贡献分别可达 5.6%、0.4%和 73.3%。有趣的是，DFT 结果表明，SiO 倾向于与 TC 形成分子间氢键，而 Fe-O 和 Al-O 在 SS 上 TC 吸附中起主要作用。MIKE 模拟表明，河流温度、初始 pH 值和 SS 浓度会显著影响 SS 输运过程中溶解 TC 的浓度。此外，腐殖酸的存在和更酸性的环境有利于 TC 在 SS 上的吸附。相反，无机阳离子的引入抑制了 TC 在 SS 上的吸附。本研究为高 SS 含量河流中抗生素的吸附机制和迁移提供了新的见解。
