简便制备偕胺肟功能化的FeO@SiO--PAMAM-AO磁性复合材料用于增强从水溶液中吸附Pb(ii)和Ni(ii)

Facile preparation of amidoxime-functionalized FeO@SiO--PAMAM-AO magnetic composites for enhanced adsorption of Pb(ii) and Ni(ii) from aqueous solution.

作者信息

Yimin Dai, Danyang Liu, Jiaqi Zou, Shengyun Wang, Yi Zhou

机构信息

School of Chemistry and Food Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology Changsha 410114 PR China

出版信息

RSC Adv. 2019 Mar 20;9(16):9171-9179. doi: 10.1039/c9ra00128j. eCollection 2019 Mar 15.

In this paper, using amidoxime as a functional monomer, different generations of polyamidoxime dendrimer magnetic microspheres (FeO@SiO--PAMAM-AO) were fabricated to adsorb Pb and Ni in aqueous solution. The magnetic adsorbents were characterized by FTIR, XRD, SEM, XPS, TEM, EDS, TGA and BET. The effects of different factors (such as solution pH, adsorption time, adsorption temperature, adsorbent dosage ) on adsorption were evaluated. FeO@SiO--PAMAM-AO has a maximum Pb(ii) adsorption of 157.25 mg g (100 mg L) at pH 5.5. Furthermore, FeO@SiO--PAMAM-AO showed an excellent adsorption performance for the removal of Ni(ii) with a maximum adsorption capacity of 191.78 mg g (100 mg L) at pH 8.0. The sorption isotherm data fitted the Freundlich isotherm model well. Adsorption kinetics analysis showed that it was best described by the pseudo-second-order rate model. Desorption experiment results showed that the adsorbent can be reused in the adsorption-desorption cycles.

在本文中，以偕胺肟作为功能单体，制备了不同代数的聚偕胺肟树枝状大分子磁性微球（FeO@SiO₂-PAMAM-AO），用于吸附水溶液中的Pb和Ni。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、能谱仪（EDS）、热重分析（TGA）和比表面积分析仪（BET）对磁性吸附剂进行了表征。评估了不同因素（如溶液pH值、吸附时间、吸附温度、吸附剂用量）对吸附的影响。FeO@SiO₂-PAMAM-AO在pH 5.5时对Pb(ii)的最大吸附量为157.25 mg g⁻¹（100 mg L⁻¹）。此外，FeO@SiO₂-PAMAM-AO在pH 8.0时对Ni(ii)的去除表现出优异的吸附性能，最大吸附容量为191.78 mg g⁻¹（100 mg L⁻¹）。吸附等温线数据很好地拟合了Freundlich等温线模型。吸附动力学分析表明，用准二级速率模型描述最佳。解吸实验结果表明，该吸附剂可在吸附-解吸循环中重复使用。