Facile preparation of magnetic separable powdered-activated-carbon/Ni adsorbent and its application in removal of perfluorooctane sulfonate (PFOS) from aqueous solution
Facile preparation of magnetic separable powdered-activated-carbon/Ni adsorbent and its application in removal of perfluorooctane sulfonate (PFOS) from aqueous solution
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磁力分离粉末活性炭/镍吸附剂的简易制备及其在去除水溶液中全氟辛烷磺酸（PFOS）中的应用
DOI：
10.1080/10934529.2011.609066
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
Guangbin Ji
中科院分区：
文献类型：
--
作者：
YAMANI ZH;Nianwu Li;Hongling Lu;Guangbin Ji
本研究的主要目的是合成磁性可分离镍/粉末活性炭（Ni/PAC）及其作为吸附剂去除水中的全氟辛烷磺酸。采用X射线衍射仪（XRD）、比表面积和孔径分析仪、振动样品磁强计（VSM）和高分辨透射电子显微镜（HRTEM）对合成的吸附剂进行了表征。合成的PAC的表面积、孔体积和孔径分别为1521.8 m2 g-1、0.96 cm 3g-1、2.54 nm。不同的动力学模型：采用准一级动力学模型、准二级动力学模型和Langmuir、Freundlich和Temkin三种吸附等温线模型研究了PFOS在所制备的吸附剂表面的吸附动力学和等温行为。采用准二级模型计算，PAC和40% Ni/PAC去除150 ppm全氟辛烷磺酸的速率常数分别为8.82×10−5和1.64×10−4。结果表明，复合吸附剂具有明显的磁滞回特性，在水相磁性分离中具有潜在的应用价值。
The main aim of this study was to synthesize magnetic separable Nickel/powdered activated carbon (Ni/PAC) and its application as an adsorbent for removal of PFOS from aqueous solution. In this work, the synthesized adsorbent using simple method was characterized by using X-ray diffractionometer (XRD), surface area and pore size analyzer, vibrating sample magnetometer (VSM), and high resolution transmission electron microscope (HRTEM). The surface area, pore volume and pore size of synthesized PAC was 1521.8 m2g−1, 0.96 cm3g−1, 2.54 nm, respectively. Different kinetic models: the pseudo–first-order model, the pseudo–second-order model, and three adsorption isotherms—Langmuir, Freundlich and Temkin—were applied to study the sorption kinetics and isothermal behavior of PFOS onto the surface of an as-prepared adsorbent. The rate constant using the pseudo–second-order model for removal of 150 ppm PFOS was estimated as 8.82×10−5 and 1.64×10−4 for PAC and 40% Ni/PAC, respectively. Our results demonstrated that the composite adsorbents exhibited a clear magnetic hysteretic behavior, indicating the potential practical application in magnetic separation of adsorbents from aqueous solution phase as well.
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