INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Adsorption Behavior of Hg(Ⅱ) on the Hydroxyl-Terminated-Polyamidoamine-Grafted Magnetic Graphene Oxide |
MA Yingxia, JIN Pengsheng, SHAO Wenjie, KOU Yalan, LA Peiqing
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State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050 |
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Abstract In recent years, heavy metal pollution of industrial wastewater has become a serious threat to human health, living resources and ecological systems even at trace concentrations due to their non-biodegradability, high toxicity and bioaccumulation. Hg(Ⅱ) has been regarded as one of the most toxic and dangerous heavy metal ions, which is seriously harmful to renal and nervous systems. In our previous work, a series of magnetic graphene oxide samples grafted with polyamidoamine dendrimers (MGO-PAMAM) were prepared, which was expected to remove Hg(Ⅱ) from aqueous solution. In this study, the terminal groups of those MGO-PAMAM were modified using chlorohydrin, and consequently the corresponding magnetic graphene oxide grafted with hydroxyl-terminated polyamidoamine dendrimers (MGO-PAMAM-OH) were fabricated. The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetry analysis (TG), vibrating sample magnetometer (VSM) and X-ray photoelectron spectroscopy (XPS). The adsorption performances of the samples for Hg(Ⅱ) were studied by batch experiments. The effects of hydroxyl-terminated PAMAM generations, Hg(Ⅱ) initial concentration, solution pH value, and circumstance temperature on the adsorption performances of the samples for Hg(Ⅱ) were investigated in detail. The pseudo-first-order and pseudo-second-order kinetics rate equations were used to analyze the adsorption kinetics. The Langmuir isothermal and Freundlich isothermal adsorption models were employed to study the specific adsorption equilibrium. The results confirmed the successful synthesis of the MGO-PAMAM-OH samples, among which the 3.0-generation-hydroxyl-terminated-polyamidoamine-grafted magnetic graphene oxide (MGO-PAMAM-OH-G3.0) exhibits the most satisfactory adsorption-performance for Hg(Ⅱ), with a maximum adsorption capacity of 129.98 mg·g-1. The adsorption of Hg(Ⅱ) on MGO-PAMAM-OH-G3.0 coincides well with pseudo-second-order kinetics rate equation, and the adsorption equilibrium is in accord with Langmuir isothermal adsorption model, demonstrating a monolayer chemisorption beha-vior of Hg(Ⅱ) on homogeneous surface. In addition, the partial reduction of Hg(Ⅱ) ions to Hg(Ⅰ) by MGO-PAMAM-OH-G3.0 was observed in the adsorption process. Moreover, MGO-PAMAM-OH-G3.0 is superparamagnetic and the saturation magnetization can attain the requirement of solid-liquid separation.
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Published: 31 January 2019
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Fund:This work was financially supported by the Natural Science Foundation of China (51403091), the Postdoctoral Science Foundation of China (2015M572616). |
About author:: Yingxia Ma received her PhD. Degree in Lanzhou University in June 2012. She is currently an associate professor in Lanzhou University of Technology, focusing on the research of preparation, characterization and properties of magnetic organic/inorganic nano-hybrid mate-rials. |
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