Department of Applied Chemistry, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2011;46(13):1482-90. doi: 10.1080/10934529.2011.609066.
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 m(2)g(-1), 0.96 cm(3)g(-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.
本研究的主要目的是合成可分离磁性的镍/粉末活性炭（Ni/PAC），并将其作为吸附剂用于从水溶液中去除全氟辛烷磺酸（PFOS）。在这项工作中，采用简单的方法合成了吸附剂，并用 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）和高分辨率透射电子显微镜（HRTEM）进行了表征。合成的 PAC 的比表面积、孔体积和孔径分别为 1521.8 m(2)g(-1)、0.96 cm(3)g(-1)和 2.54 nm。不同的动力学模型：准一级模型、准二级模型和三种吸附等温线——朗缪尔、弗伦德利希和滕金——被应用于研究 PFOS 在合成吸附剂表面上的吸附动力学和等温行为。使用准二级模型，去除 150 ppm PFOS 的速率常数分别为 PAC 和 40%Ni/PAC 的 8.82×10(-5)和 1.64×10(-4)。我们的结果表明，复合吸附剂表现出明显的磁滞行为，表明其在从水相分离吸附剂方面具有潜在的实际应用。
