<br>FeCl3 改性颗粒活性炭在水溶液中对全氟辛酸的吸附机制,Chemosphere

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FeCl3 改性颗粒活性炭在水溶液中对全氟辛酸的吸附机制
Chemosphere ( IF 8.1 ) Pub Date : 2022-05-16 , DOI: 10.1016/j.chemosphere.2022.134965
Sun-Kyung Ahn ₁ , Keun-Young Park ₂ , Won-Jung Song ₁ , Young-Min Park ₁ , Ji-Hyang Kweon ₁

Affiliation

全氟辛酸（PFOA）是一种新兴的有机污染物，在环境中持续存在，并已在人类和野生动物中检测到。活性炭（AC）吸附等多种技术已被用于去除水中的 PFOA。在这项研究中，应用了 Fe 浸渍加/不加 AC 后热处理，以改善 PFOA 的吸附。使用三种动力学模型评估吸附机制：准一级模型、准二级模型和粒子内扩散模型。用动力学模型对实验结果的解释表明，化学相互作用（如静电吸引或络合）与物理吸附一起被认为是吸附机制。两个等温线模型表明，改性的 AC （171.0–189.9 mg g-1）的吸附能力高于未改性的 AC （164.9 mg g-1），这表明改性在一定程度上提高了最大可达到的表面浓度和吸附亲和力。使用能量色散 X 射线光谱法观察改性 AC 上均匀分布的铁含量。Fe 浸渍的 AC 显示比表面积和总孔体积减少;然而，后热处理在很大程度上恢复了孔隙结构。由可接近表面积归一化的等温线揭示了 Fe 浸渍表面对 PFOA 吸附的重要性。零电荷点的 pH 值与 AC 的化学成分相当，这意味着 Fe 浸渍表面的增加对于改善 PFOA 吸附至关重要。因此，通过实施适当的 AC 改性策略，尤其是使用 Fe 浸渍，可以显着增强 PFOA 的去除。

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Adsorption mechanisms on perfluorooctanoic acid by FeCl3 modified granular activated carbon in aqueous solutions

Perfluorooctanoic acid (PFOA) is an emerging organic pollutant that is persistent in the environmental, and has been detected in humans, and wildlife. Several technologies, such as activated carbon (AC) adsorption have been used to remove PFOA from water. In this study, Fe-impregnation with/without post-thermal treatment of AC was applied to improve the adsorption of PFOA. The adsorption mechanisms were evaluated using three kinetic models: pseudo-first-order model, pseudo-second-order model, and intra-particle diffusion models. Interpretation of experimental results with the kinetic models revealed that chemical interactions, such as electrostatic attraction or complexation were suggested as the adsorption mechanisms along with physical adsorption. Two isotherm models demonstrated that the modified ACs (171.0–189.9 mg g−1) had increases in adsorption capacities than the unmodified AC (164.9 mg g−1), which indicated that modification improved the maximum achievable surface concentrations and adsorption affinity to some extent. The evenly distributed iron content on the modified ACs was visualized using an energy dispersive X-ray spectroscopy. The Fe-impregnated AC showed a reduction in the specific surface area and total pore volume; however, post-thermal treatment largely recovered the pore structures. The isotherms normalized by the accessible surface area revealed the importance of the Fe-impregnated surfaces on PFOA adsorption. Comparable pH values of the point of zero charge and chemical compositions of the ACs implied that an increase in Fe-impregnated surface was crucial to improve PFOA adsorption. Thus, substantial enhancement of PFOA removal can be achieved by implementing a proper strategy for AC modification, especially using Fe-impregnation.

更新日期：2022-05-16

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