光谱学与光谱分析, 2017, 37 (11): 3499, 网络出版: 2018-01-04  

磁性Pb(Ⅱ)表面印迹聚合物(Fe3O4/GO-IIP)的制备及谱学表征

Preparation and Spectroscopy Characterization of Magnetic Pb(Ⅱ)-Ion Surface Imprinted Polymers(Fe3O4/GO-IIP)
作者单位
吉林大学地下水资源与环境教育部重点实验室, 吉林 长春 130021
摘要
吸附法处理含铅废水因其经济性备受关注。 开发可回收的专一性Pb(Ⅱ)吸附材料是高效处理含铅废水和实现铅回收的关键。 结合氧化石墨烯(GO)的强吸附性、 Fe3O4的磁性和表面印迹技术, 以氧化石墨烯负载四氧化三铁(Fe3O4/GO)为载体, 硝酸铅为模板离子, 甲基丙烯酸(MAA)及水杨醛肟(SALO)为功能单体, 乙二醇二甲基丙烯酸酯(EGDMA)为交联剂制备了磁性Pb(Ⅱ)表面印迹材料(Fe3O4/GO-IIP), 并探讨其重复利用性和对Pb(Ⅱ)的专一性吸附性。 结合XRD, SEM, FTIR等谱学方法, 对Fe3O4/GO-IIP进行表征, 并分析其对Pb(Ⅱ)的吸附机理。 以Fe3O4/GO-IIP作为吸附剂选择性去除水溶液中的Pb(Ⅱ), 结果表明, Fe3O4/GO-IIP对Pb(Ⅱ)具有很好的亲和性, 反应在5 min内, 对初始浓度10 mg·L-1 的Pb(NO3)2的去除率达到70%, 反应在20 min左右达到吸附平衡。 准二级吸附动力学和Langmuir吸附等温线能较好的表达其吸附过程。 TEM和SEM图谱证明了Fe3O4均匀地分散在GO表面, 粒径为10~20 nm, Fe3O4/GO-IIP表面存在Pb(Ⅱ)印迹孔穴, 增强其对Pb(Ⅱ)的选择吸附性; 在竞争离子[Cd(Ⅱ), Zn(Ⅱ), Cu(Ⅱ)]存在条件下, Fe3O4/GO-IIP对目标污染物Pb(Ⅱ)的选择性系数比非印迹吸附材料(NIP)提高2~5倍; XRD和FTIR谱图分别从晶相结构和官能团证明了Fe3O4/GO-IIP的成功合成。 对制备材料进行磁分离后洗脱再利用, 结果表明Fe3O4/GO-IIP具有良好的重复利用性。 该结果对于含铅废水处理和铅回收具有重要的意义。
Abstract
Adsorption is widely used in heavy metals wastewater treatments because of its economy and efficiency. Developing recyclable specific Pb(Ⅱ) adsorption materials is important for lead wastewater treatment and lead recycling. Fe3O4/GO-IIP, with properties of adsorb ability (GO) and magnetism (Fe3O4), was successfully synthesized combined with surface imprinting technology by using magnetic Fe3O4/GO as supporter, lead nitrate as a template, methylacrylic acid as functional monomer, and ethylene glycol dimethacrylate as the cross-linker. The reusability and specific adsorption for Pb(Ⅱ) of Fe3O4/GO-IIP were discussed. X-ray diffraction(XRD), scanning electron microscope(SEM) and Fourier transform infrared spectroscopy(FTIR) were used to determine the characteristics of Fe3O4/GO-IIP and analyze the removal mechanism for Pb(Ⅱ). Fe3O4/GO-IIP was used as sorbents to selectively remove Pb(Ⅱ) from aqueous solutions. Results indicated that Fe3O4/GO-IIP had a high affinity to Pb(Ⅱ), the removal rate of Pb(Ⅱ) reached 70% within 5 minutes and the reaction achieved adsorption equilibrium within 20 minutes. Pseudo second order kinetics and Langmuir isotherm adsorption model could preferably express the adsorption process. Transmission electron microscopy(TEM) and SEM images demonstrated that Fe3O4 was uniformly loaded on the surface of GO, and the size rang was from 10 to 20 nm. The imprinted cavity existing on the surface of Fe3O4/GO-IIP enhanced the selective adsorption of Pb(Ⅱ). The selectivity coefficient of Fe3O4/GO-IIP was 2~5 times higher than that of Fe3O4/GO-NIP in the presence of competitive ions [Cd(Ⅱ), Zn(Ⅱ), Cu(Ⅱ) and et al]. XRD and FTIR spectra confirmed the synthesis of Fe3O4/GO-IIP.Fe3O4/GO-IIP and exhibited favorable characteristics of re-utilizing.

胡文华, 董军, 迟子芳, 任黎明. 磁性Pb(Ⅱ)表面印迹聚合物(Fe3O4/GO-IIP)的制备及谱学表征[J]. 光谱学与光谱分析, 2017, 37(11): 3499. HU Wen-hua, DONG Jun, CHI Zi-fang, REN Li-ming. Preparation and Spectroscopy Characterization of Magnetic Pb(Ⅱ)-Ion Surface Imprinted Polymers(Fe3O4/GO-IIP)[J]. Spectroscopy and Spectral Analysis, 2017, 37(11): 3499.

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