Adsorption of Perfluorooctane Sulfonate and Perfluorooctanoic Acid on Magnetic Mesoporous Carbon Nitride
Adsorption of Perfluorooctane Sulfonate and Perfluorooctanoic Acid on Magnetic Mesoporous Carbon Nitride
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DOI：
10.1021/je400974z
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发表时间：
2014-01
影响因子：
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通讯作者：
Tingting Yan;Huan Chen;Fang Jiang;Xin Wang
中科院分区：
文献类型：
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作者：
Tingting Yan;Huan Chen;Fang Jiang;Xin Wang
用化学沉淀法合成了一种新型的大比表面积磁性介孔氮化碳(MMCN)吸附剂，并用X射线衍射仪、透射电子显微镜、X射线光电子能谱、傅里叶变换红外光谱、Zeta电位和磁滞回线对其进行了表征。动力学结果表明，全氟辛烷磺酸(PFOS)和全氟辛酸(PFOA)在MMCN上的吸附在180min内达到平衡，吸附过程符合准二级动力学模型。吸附等温线符合朗缪尔模型，全氟辛烷磺酸和全氟辛酸在MMCN上的最大吸附量分别为454.55和370.37 mg g-1，表明MMCN对全氟辛烷磺酸的吸附性能优于全氟辛酸。全氟辛烷磺酸和全氟辛酸在MMCN上的吸附量差异归因于全氟辛烷磺酸和全氟辛酸官能团的不同。在自然条件下，全氟辛烷磺酸和全氟辛酸在MMCN上的吸附是自发的吸热吸附。
A novel magnetic mesoporous carbon nitride (MMCN) adsorbent with large surface area has been synthesized by a chemical precipitation method, and characterized by X-ray diffraction pattern, transmission electron microscope, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, zeta potential, and magnetic hysteresis loop measurements. Kinetic results revealed that the adsorption equilibrium of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) on MMCN was achieved within 180 min, and the adsorption process followed the pseudo-second-order kinetic model. Adsorption isotherms fit well to the Langmuir model, and the maximum adsorption amounts of PFOS and PFOA on MMCN were 454.55 and 370.37 mg g–1, indicative of a more favorable adsorption of PFOS by MMCN than PFOA. The difference of adsorption amount of PFOS and PFOA on MMCN was ascribed to the different functional groups of PFOS and PFOA. Moreover, adsorption of PFOS and PFOA on MMCN was spontaneous and endothermic in nat...