State Key Laboratory of Chemical Resource Engineering, College of Materials Science & Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
J Hazard Mater. 2011 Sep 15;192(3):1401-8. doi: 10.1016/j.jhazmat.2011.06.054. Epub 2011 Jun 24.
The surface-initiated atom transfer radical polymerization (ATRP) was used to successfully prepare the aminated cotton and polyacrylic acid sodium (P(AA-Na))-grafted cotton for the efficient removal of Cu(II) and Pb(II) from aqueous solution in this study. The modified cotton surfaces were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The grafted long polymers with high density of amine and carboxyl groups on the cotton surfaces were responsible for the enhanced adsorption of heavy metals. The sorption behaviors including sorption kinetics, isotherms and pH effect were investigated. The sorption equilibrium of Cu(II) and Pb(II) was achieved within 1h on the P(AA-Na)-grafted cotton, much faster than 8h on the aminated cotton. According to the Langmuir fitting, the maximum sorption capacities of Cu(II) and Pb(II) on the P(AA-Na)-grafted cotton were 2.45 and 2.44 mmol/g, respectively, higher than many adsorbents reported in the literature. The P(AA-Na)-grafted cotton had better adsorption behaviors for Cu(II) and Pb(II) than the aminated cotton.
本研究采用表面引发原子转移自由基聚合（ATRP）成功制备了氨基化棉和聚丙烯酸钠（P(AA-Na)）接枝棉，用于从水溶液中高效去除 Cu(II) 和 Pb(II)。通过扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）和 X 射线光电子能谱（XPS）对改性棉表面进行了表征。棉表面接枝了高密度的胺基和羧基长聚合物，这是重金属增强吸附的原因。研究了吸附行为，包括吸附动力学、等温线和 pH 值影响。P(AA-Na)接枝棉上 Cu(II)和 Pb(II)的吸附平衡在 1 小时内达到，远快于氨基化棉上的 8 小时。根据 Langmuir 拟合，P(AA-Na)接枝棉对 Cu(II)和 Pb(II)的最大吸附容量分别为 2.45 和 2.44mmol/g，高于文献中报道的许多吸附剂。P(AA-Na)接枝棉对 Cu(II)和 Pb(II)的吸附性能优于氨基化棉。
