Preparation of Polyacrylonitrile/Natural Sand Composite Materials and Analysis of Adsorption Properties of Pb(Ⅱ) on It by FAAS
Medine Abduwayit, Ismayil Nurulla, Shawket Abliz*
Key Lab of Oil &Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region，College of Chemistry & Engineering, Xinjiang University, Urumqi 830046, China
Abstract：Surfaces of natural sand particles were modified with (3-chloropropyl) trichlorosilane, so that bridging groups were introduced on the surfaces of natural sand particles; By grafting polyacrylonitrile onto the modified surfaces of the natural sand particles, a novel polyacrylonitrile/natural sand composite material was prepared from the acrylonitrile, the azobisisobutyronitrile, the divinylbenzene and the modified natural sand particles, which are as functional monomer, initiator, either skeleton monomer or cross-linking agent and carrier respectively; the composite materials were characterized by using infrared spectroscopy and scanning electron microscopy;On the FTIR spectrum, the main characteristic peaks of various functional groups including nitrile，benzene ring，and silicon hydroxyl, which were from functional monomer, cross-linking agent and carrier respectively, were observed. On the SEM, two different cross section morphologies having different density which were from acrylonitrile and modified sand particles were observed; This proved that the polyacrylonitrile was decorated on modified sand particles during our preparation process. After preparing the composite materials, micro-column of separation and preconcentration was prepared using the composite materials as filler; the adsorption of some toxic heavy metal ions onto the composite materials was observed by flame atomic absorption spectrometry (FAAS); The results show that the adsorption of Pb2+ onto the composite materials was more stronger than the absorption of other toxic heavy metal ions, therefore, in this paper, the adsorption of Pb2+ onto the composite materials was mainly studied，at room temperature, when pH and flow rate of solution were 5.4 and 4 mL·min-1 respectively, the trace Pb(Ⅱ) ions could be quantitatively adsorbed onto the composite materials; the maximum adsorption capacity of Pb(Ⅱ) on the composite materials can reach 62.9 mg·g-1. the column was eluted by 0.5 mol·L-1 HCl and recovery of Pb(Ⅱ) was more than 96%.
买迪娜木·阿不都瓦依提，司马义·努尔拉，肖开提·阿布力孜* . 聚丙烯腈/天然沙粒复合材料的制备及FAAS分析其对Pb(Ⅱ)吸附性 [J]. 光谱学与光谱分析, 2015, 35(02): 539-542.
Medine Abduwayit, Ismayil Nurulla, Shawket Abliz* . Preparation of Polyacrylonitrile/Natural Sand Composite Materials and Analysis of Adsorption Properties of Pb(Ⅱ) on It by FAAS. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(02): 539-542.
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