Key Laboratory of Synthetic and Natural Function Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, China.
Key Laboratory of Synthetic and Natural Function Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, China.
J Hazard Mater. 2014 Jul 15;276:129-37. doi: 10.1016/j.jhazmat.2014.05.027. Epub 2014 May 16.
Novel 5-aminopyridine-2-tetrazole-functionalized polystyrene resin (APTZ-PS) was prepared by anchoring 5-aminopyridine-2-carbonitrile onto chloromethylated polystyrene beads (CMPS) and subsequently using the cyano-tetrazole conversion reaction. The APTZ-PS resin was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and specific surface area and pore size analyses. The adsorption experiments of the prepared resin for heavy metal ions were conducted by batch methods. The effects of the experimental conditions, such as pH, contact time and initial metal ion concentration on the adsorption properties of Cu(II), Pb(II) and Hg(II) were investigated. The results showed that the resin possessed perfect adsorption capacities for Cu(II), Pb(II) and Hg(II), and the selectivity was different from the commonly used iminodiacetic acid-chelating resin. The sorption kinetics of the three metal ions followed the pseudo-second-order equation. The adsorption isotherms for Cu(II) and Pb(II) could be better fitted by the Langmuir model than the Freundlich model, whereas the Freundlich model was the best for the Hg(II) ion. Even after five consecutive adsorption-desorption cycles, no obvious change in the adsorption capacity of the resin was found, which implied that the APTZ-PS resin was suitable for the efficient removal of heavy metal ions from aqueous solution.
新型 5-氨基-2-四唑基功能化聚苯乙烯树脂（APTZ-PS）是通过将 5-氨基-2-氰基嘧啶锚定到氯甲基化聚苯乙烯珠上，然后利用氰基-四唑转化反应制备的。APTZ-PS 树脂通过傅里叶变换红外光谱（FT-IR）、X 射线光电子能谱（XPS）和比表面积及孔径分析进行了表征。采用批量法进行了制备树脂对重金属离子吸附实验，考察了 pH 值、接触时间和初始金属离子浓度等实验条件对 Cu(II)、Pb(II)和 Hg(II)吸附性能的影响。结果表明，该树脂对 Cu(II)、Pb(II)和 Hg(II)具有良好的吸附能力，且选择性与常用的亚氨基二乙酸螯合树脂不同。三种金属离子的吸附动力学符合拟二级方程。Cu(II)和 Pb(II)的吸附等温线更符合 Langmuir 模型，而 Hg(II)的吸附等温线更符合 Freundlich 模型。即使经过五次连续的吸附-解吸循环，树脂的吸附容量也没有明显变化，这表明 APTZ-PS 树脂适合从水溶液中高效去除重金属离子。
