Abduwayit Medine, Nurulla Ismayil, Abliz Shawket
Guang Pu Xue Yu Guang Pu Fen Xi. 2015 Feb;35(2):539-42.
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 novelpolyacrylonitrile/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 x 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 x g(-1). The column was eluted by 0.5 mol x L(-1) HCl and recovery of Pb(II) was more than 96%.
用（3-氯丙基）三氯硅烷对天然砂粒表面进行改性，从而在天然砂粒表面引入桥连基团；通过将聚丙烯腈接枝到天然砂粒的改性表面上，由丙烯腈、偶氮二异丁腈、二乙烯基苯和改性天然砂粒分别作为功能单体、引发剂、骨架单体或交联剂以及载体，制备了一种新型的聚丙烯腈/天然砂复合材料；利用红外光谱和扫描电子显微镜对复合材料进行表征；在傅里叶变换红外光谱上，观察到分别来自功能单体、交联剂和载体的包括腈基、苯环和硅羟基在内的各种官能团的主要特征峰。在扫描电子显微镜下，观察到来自丙烯腈和改性砂粒的具有不同密度的两种不同横截面形态；这证明在我们的制备过程中聚丙烯腈被修饰在了改性砂粒上。制备复合材料后，以该复合材料为填料制备了分离富集微柱；通过火焰原子吸收光谱法（FAAS）观察了一些有毒重金属离子在复合材料上的吸附情况；结果表明，复合材料对Pb2+的吸附比其他有毒重金属离子的吸附更强，因此，本文主要研究了复合材料对Pb2+的吸附，在室温下，当溶液的pH值和流速分别为5.4和4 mL·min-1时，痕量Pb(II)离子可被定量吸附到复合材料上；复合材料对Pb(II)的最大吸附容量可达62.9 mg·g-1。用0.5 mol·L-1 HCl对柱子进行洗脱，Pb(II)的回收率大于96%。
