Yuan Longmiao, Wu Yingqin, Fan Qiaohui, Li Ping, Liang Jianjun, Liu Yan Hong, Ma Rong, Li Ruijie, Shi LeiPing
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou 730000, China.
Sci Total Environ. 2023 Mar 1;862:160872. doi: 10.1016/j.scitotenv.2022.160872. Epub 2022 Dec 12.
Investigate the effect of soil organic matter (SOM) and low molecular weight organic acids (LMWOAs) on minerals adsorption of PAHs. Batch adsorption experiments have been carried out to study the adsorption of PAHs (Naphthalene (NaP), Phenanthrene (Phe) and Pyrene (Pyr)) by minerals (Montmorillonite (Mnt), kaolinite (Kln) and calcite (Cal)). This research found that compared with Kln and Cal, Mnt showed the maximum adsorption capability for PAHs. And the order of PAHs adsorption by Mnt was: Pyr > Phe > Nap, which corresponds to the octanol-water partition coefficient (K) of different PAHs. The adsorption kinetic and isotherm were well fitted by Pseudo-second-order kinetic model, Freundlich and Linear isotherm model. Furthermore, inorganic ions (Ca) impacted PAHs adsorption by competitive adsorption and cation-π interactive. Cal has the maximum desorption of PAHs among three minerals, and there was desorption hysteresis phenomenon. Field emission-scanning electron microscope (Fe-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) analysis indicated that SOM enhanced the sorption of PAHs by van der Waals, hydrogen bonding, π-π interactions, and chemical bonding. LMWOAs significantly inhibited PAHs adsorption and promote PAHs desorption from the minerals. As a result, LMWOAs increased of PAHs bioavailability, which provide a new strategy to improve PAHs cleanup efficiency.
研究土壤有机质（SOM）和低分子量有机酸（LMWOAs）对多环芳烃（PAHs）矿物吸附的影响。进行了批量吸附实验，以研究矿物（蒙脱石（Mnt）、高岭土（Kln）和方解石（Cal））对多环芳烃（萘（NaP）、菲（Phe）和芘（Pyr））的吸附。本研究发现，与Kln和Cal相比，Mnt对多环芳烃表现出最大的吸附能力。Mnt对多环芳烃的吸附顺序为：Pyr > Phe > Nap，这与不同多环芳烃的正辛醇-水分配系数（K）相对应。吸附动力学和等温线分别用伪二级动力学模型、Freundlich模型和线性等温线模型很好地拟合。此外，无机离子（Ca）通过竞争吸附和阳离子-π相互作用影响多环芳烃的吸附。在三种矿物中，Cal对多环芳烃的解吸量最大，且存在解吸滞后现象。场发射扫描电子显微镜（Fe-SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）分析表明，SOM通过范德华力、氢键、π-π相互作用和化学键增强了多环芳烃的吸附。LMWOAs显著抑制多环芳烃的吸附，并促进多环芳烃从矿物上的解吸。因此，LMWOAs提高了多环芳烃的生物有效性，为提高多环芳烃的清理效率提供了一种新策略。
