Wang Jianzhi, Zhao Guanghui, Li Yanfeng, Zhu Hao, Peng Xiaomen, Gao Xian
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou 730000, China.
Dalton Trans. 2014 Aug 14;43(30):11637-45. doi: 10.1039/c4dt00694a. Epub 2014 Jun 19.
Functionalized magnetic adsorbents (FMAs) were synthesized by a facile and surfactant-free one-pot solvothermal approach, using iron(III) chloride hexahydrate as the precursor, ethylene glycol as the reducing agent, ammonium acetate, and EDTA-2Na as an electrostatic stabilization agent. The self-assembly process of the functionalized magnetic adsorbents has been investigated and a plausible mechanism is proposed. The resulting functionalized magnetic adsorbents have relatively high specific surface areas (71.6 m(2) g(-1)), excellent magnetic properties and rich functional groups (carboxyl groups, hydroxyl groups and hydrophobic groups). Meanwhile, the resulting FMAs were employed in the adsorption of dyes and heavy metal ions from aqueous solution. Herein, we took two types of typical pollutants, dyes (methylene blue (MB) and malachite green (MG)) and toxic heavy metal ions (Cr(VI) and Pb(II)) as examples of organic and inorganic pollutants in environmental water. The excellent intrinsic properties of the FMAs led to a stronger adsorption ability than a solid Fe3O4 adsorbent for MB, MG, Cr(VI) and Pb(II). Especially, the simultaneous adsorption of the functionalized flower-like magnetic adsorbents for MG and Pb(II) was also determined in a binary system. Finally, it was demonstrated that the resulting flower-like magnetic adsorbents are expected to be a good candidate as an adsorbent for water treatment.
采用简便的无表面活性剂一锅法溶剂热法，以六水合氯化铁为前驱体，乙二醇为还原剂，醋酸铵和乙二胺四乙酸二钠为静电稳定剂，合成了功能化磁性吸附剂（FMA）。研究了功能化磁性吸附剂的自组装过程，并提出了合理的机理。所得功能化磁性吸附剂具有较高的比表面积（71.6 m(2) g(-1)）、优异的磁性和丰富的官能团（羧基、羟基和疏水基团）。同时，将所得的FMA用于吸附水溶液中的染料和重金属离子。在此，我们以两种典型污染物，即染料（亚甲基蓝（MB）和孔雀石绿（MG））和有毒重金属离子（Cr(VI)和Pb(II)）作为环境水中有机和无机污染物的实例。FMA优异的固有性质使其对MB、MG、Cr(VI)和Pb(II)的吸附能力比固体Fe3O4吸附剂更强。特别是，还测定了功能化花状磁性吸附剂在二元体系中对MG和Pb(II)的同时吸附。最后，结果表明所得花状磁性吸附剂有望成为一种优良的水处理吸附剂候选材料。
