Adsorption Behavior of Hg(Ⅱ) on the Hydroxyl-Terminated-Polyamidoamine-Grafted Magnetic Graphene Oxide
MA Yingxia, JIN Pengsheng, SHAO Wenjie, KOU Yalan, LA Peiqing
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050
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.
马应霞, 金朋生, 邵文杰, 寇亚兰, 喇培清. 表面接枝端羟基聚酰胺-胺的磁性氧化石墨烯对Hg(Ⅱ)的吸附性能[J]. 材料导报, 2019, 33(2): 234-239.
MA Yingxia, JIN Pengsheng, SHAO Wenjie, KOU Yalan, LA Peiqing. Adsorption Behavior of Hg(Ⅱ) on the Hydroxyl-Terminated-Polyamidoamine-Grafted Magnetic Graphene Oxide. Materials Reports, 2019, 33(2): 234-239.
1 Zhou Y Y, Tang L, Zeng G M, et al. Sensors and Actuators B,2016,223,280. 2 Ji W B, Yap S H K, Panwar N, et al. Sensors and Actuators B,2016,237,142. 3 Islam M S, Choi W S, Nam B, et al. Chemical Engineering Journal,2017,307,208. 4 Shabani K S, Ardejani F D, Badii K, et al. Arabian Journal of Chemistry,2017,10, S3108. 5 Peng R, Chen X N, Ghosh R. Separation and Purification Technology,2017,174,561. 6 Gopalakrishnan A, Krishnan R, Thangavel S, et al. Journal of Industrial and Engineering Chemistry,2015,30,14. 7 Cui L M, Guo X Y, Wei Q, et al. Journal of Colloid and Interface Science,2015,439,112. 8 Dvornic P R, Tornalia D A. Current Opinion in Colloid & Interface Science,1996,1,221. 9 Xiao W D, Yan B, Zeng H B, et al. Carbon,2016,105,655. 10 Yuan Y, Zhang G H, Li Y, et al. Polymer Chemistry,2013,40,2164. 11 Ma Y X, Xing D, Shao W J, et al. Journal of Colloid and Interface Science,2017,505,352. 12 Nata I F, Salim G W, Lee C K. Journal of Hazardous Materials,2010,183,853. 13 Ge H C, Hua T T. Carbohydrate Polymers,2016,153,246. 14 Gu Y M, Guo Y Z, Wang C Y, et al. Materials Science and Engineering C,2017,70,572. 15 Liu L T, Kong L, Wang H X, et al. Solar Energy Materials & Solar Cells,2016,149,40. 16 Wang B Y, Wu Z L, Qin W D. Sensors and Actuators B,2017,247,774. 17 Wang C C, Ge H Y, Zhao Y Y, et al. Journal of Magnetism and Magnetic Materials,2017,423,421. 18 Danesh N, Hosseini M, Ghorbani M, et al. Synthetic Metals,2016,220,508. 19 Pan S D, Zhang Y, Shen H Y, et al. Chemical Engineering Journal,2012,210,564. 20 Gong X J, Lu W J, Paau M C, et al. Analytia Chimica Acta,2015,86,74. 21 Zhang B H, Yang Q, Li Z H, et al. Colloids and Surfaces A,2015,485,34. 22 Zarghami Z, Akbari A, Latifi A M, et al. Bioresource Technology,2016,205,230. 23 Yen C H, Lien H L, Chung J S, et al. Journal of Hazardous Materials,2017,322,219. 24 Yao X X, Wang H C, Ma Z H, et al. Chinese Journal of Chemical Engineering,2016,24,1348. 25 Wang Y F, Qu R J, Pan F W, et al. Chemical Engineering Journal,2017,317,198.
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2019, Vol. 33 
