Chen Youning, Zhao Wei, Wang Huan, Meng Xiaohua, Zhang Linjie
College of Chemistry and Chemical Engineering, Xianyang Normal College, Xianyang 712000, People's Republic of China.
State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, People's Republic of China.
R Soc Open Sci. 2018 Jun 6;5(6):180281. doi: 10.1098/rsos.180281. eCollection 2018 Jun.
A novel polyamine-type starch/glycidyl methacrylate (GMA) copolymer with a high capacity for the adsorption of heavy metal ions was prepared via graft copolymerization of GMA and corn starch and a subsequent amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The copolymers were characterized by Fourier transform infrared spectrometry, X-ray diffraction and scanning electron microscopy, and adsorption properties on modified starch of Cu(II), Pb(II), Cd(II) and Cr(III) were studied. By analysing the relationship between adsorption capacity and pH, adsorption isotherms and adsorption kinetics, it is proved that the adsorption of the four metal ions is mainly based on the chemical adsorption of coordination. The maximum adsorption capacities of the copolymer were up to 2.33, 1.25, 0.83 and 0.56 mmol g for Cu(II), Pb(II), Cd(II) and Cr(III), respectively. The adsorption of the four concerned metal ions was hardly affected by common coexisting ions such as Na(I), K(I), Ca(II) and Mg(II), whereas it was slightly decreased when Fe(II) and Zn(II) coexisted in the solution, which illustrates the selective adsorption of Cu(II), Pb(II), Cd(II) and Cr(III) from wastewater. After 10 cycles of adsorption-desorption experiments, there was no significant change in the adsorption capacity, indicating that the polyamine-type starch/GMA copolymer has high adsorption capacity and good reusability.
通过甲基丙烯酸缩水甘油酯（GMA）与玉米淀粉的接枝共聚反应以及随后二乙烯三胺的氨基与GMA中的环氧基之间的胺化反应，制备了一种对重金属离子具有高吸附能力的新型多胺型淀粉/甲基丙烯酸缩水甘油酯（GMA）共聚物。通过傅里叶变换红外光谱、X射线衍射和扫描电子显微镜对共聚物进行了表征，并研究了其对Cu(II)、Pb(II)、Cd(II)和Cr(III)在改性淀粉上的吸附性能。通过分析吸附容量与pH值、吸附等温线和吸附动力学之间的关系，证明了四种金属离子的吸附主要基于配位化学吸附。该共聚物对Cu(II)、Pb(II)、Cd(II)和Cr(III)的最大吸附容量分别高达2.33、1.25、0.83和0.56 mmol g。四种相关金属离子的吸附几乎不受Na(I)、K(I)、Ca(II)和Mg(II)等常见共存离子的影响，而当溶液中Fe(II)和Zn(II)共存时，吸附量略有下降，这说明了该共聚物对废水中Cu(II)、Pb(II)、Cd(II)和Cr(III)的选择性吸附。经过10次吸附-解吸循环实验后，吸附容量没有显著变化，表明多胺型淀粉/GMA共聚物具有高吸附容量和良好的可重复使用性。
