State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Environ Pollut. 2019 Nov;254(Pt A):112924. doi: 10.1016/j.envpol.2019.07.092. Epub 2019 Jul 19.
The long-term use of animal manure in agriculture has resulted in estrogen pollution, which poses risks to facility vegetable soils. Owing to the complex soil composition, estrogen may exhibit a variety of behaviors at the water/soil interface. This study demonstrated the role of humic acid (HA) on the 17β-estradiol (E2) adsorption by clay minerals (montmorillonite, kaolinite, and hematite). The interfacial behaviors were investigated using adsorption kinetics and isotherms data. Then, the effects of temperature, pH, and bisphenol A (BPA) on the interactions between humic-mineral complexes and E2 were explored. The adsorption of E2 is an exothermic and spontaneous process, and the addition of HA to minerals significantly promoted their E2 adsorption capacities. Higher pH levels (>10) and the presence of BPA decreased the adsorption capacities of minerals and mineral complexes for E2. Moreover, intercalation, hydrophobic partitioning, π-π interactions and hydrogen bonding could dominate the E2 adsorption onto complexes. These results provided insight into the interfacial behaviors of E2 on the surfaces of humic-mineral complexes and promoted the understanding of the migration and transport of estrogens in soils.
农业中长期使用动物粪便导致了雌激素污染，这给设施蔬菜土壤带来了风险。由于土壤成分复杂，雌激素在水/土界面可能表现出多种行为。本研究通过吸附动力学和等温线数据，证明了腐殖酸（HA）对粘土矿物（蒙脱石、高岭石和赤铁矿）吸附 17β-雌二醇（E2）的作用。然后，探讨了温度、pH 值和双酚 A（BPA）对腐殖质-矿物复合物与 E2 之间相互作用的影响。E2 的吸附是一个放热和自发的过程，HA 的添加显著促进了矿物及其矿物复合物对 E2 的吸附能力。较高的 pH 值（>10）和 BPA 的存在降低了矿物和矿物复合物对 E2 的吸附能力。此外，插层、疏水性分配、π-π 相互作用和氢键可能主导 E2 对复合物的吸附。这些结果深入了解了 E2 在腐殖质-矿物复合物表面的界面行为，并促进了对土壤中雌激素迁移和传输的理解。
