基于金属有机骨架材料的除磷吸附剂研发

发布时间：2018-05-12 14:53

本文选题：MOFs + 功能化改性　；参考：《济南大学》2017年硕士论文

【摘要】：近年来,金属有机骨架材料(MOFs)作为一种新型的多孔材料,因其在吸附、传感、催化、储氢、分离等方面的优良性能而备受关注。本论文制备了多种金属有机骨架材料应用于磷酸盐的吸附实验中,探究其对磷酸盐的吸附效能,具体研究结果如下:(1)采用传统水热法,合成了MIL-101(Fe)及具有磁性的Fe_3O_4@MIL-101(Fe)材料,并对其进行了X射线衍射(XRD)、傅里叶红外光谱(FTIR)和扫描电镜(SEM)表征,结果表明,MIL-101(Fe)成功地包覆于Fe_3O_4上,合成了核壳结构的Fe_3O_4@MIL-101(Fe)。对Fe_3O_4@MIL-101(Fe)吸附磷酸盐的性能进行探究,包括吸附剂投加量、pH值、吸附时间对吸附过程的影响,并进行了吸附动力学和等温线拟合,发现其符合拟二级动力学及Langmuir吸附等温线模型。与其他常见吸附剂相比,Fe_3O_4@MIL-101(Fe)具有很好的吸附效果。同时,Fe_3O_4@MIL-101(Fe)在吸附后可以通过外加磁场实现快速分离,为磷酸盐的去除提供了一种简便有效的方法。(2)采用水热法合成了La-MOFs,并利用XRD、FTIR、SEM以及Zeta电位对其表征。考察了吸附剂投加量、pH值、吸附时间对磷酸盐吸附过程的影响。结果表明La-MOFs吸附磷酸盐的过程更符合拟二级动力学模型和Langmuir等温线模型,推断出其吸附机理为静电吸引和配体交换。此外,La-MOFs对磷酸根的吸附性能较Fe_3O_4@MIL-101(Fe)有了很大的提升,说明La-MOFs材料在磷酸盐吸附方面有巨大潜能。(3)水热合成NH2-La-MOFs材料并利用XRD、FTIR、SEM、能量色散X射线光谱(EDX)及Zeta电位进行表征。对NH2-La-MOFs吸附磷酸根的性能进行探究,考察了吸附剂投加量、pH值、吸附时间对其的影响。结果表明该材料对磷酸根的吸附效果较好,符合拟二级动力学和Langmuir吸附等温线模型。还通过对NH2-La-MOFs的连续在线原位衰减全反射傅里叶变换红外光谱(ATR-FTIR)实验,证明了NH2-La-MOFs对磷酸根的吸附存在化学吸附。
[Abstract]:In recent years, as a new type of porous material, metal organic framework material (MOFs) has attracted much attention because of its excellent properties in adsorption, sensing, catalysis, hydrogen storage and separation. In this paper, a variety of organometallic skeleton materials have been prepared in the adsorption experiments of phosphate, and the specific results are studied. As follows: (1) MIL-101 (Fe) and magnetic Fe_3O_4@MIL-101 (Fe) materials are synthesized by traditional hydrothermal method, and X ray diffraction (XRD), Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) are used to characterize them. The results show that MIL-101 (Fe) is coated in Fe_3O_4 and syntheses the nuclear shell structure. 101 (Fe) adsorption of phosphate, including the amount of adsorbents, the pH value, the effect of adsorption time on the adsorption process, and the adsorption kinetics and the isotherm fitting, found that it conforms to the pseudo two kinetics and the Langmuir adsorption isotherm model. Compared with other common adsorbents, Fe_3O_4@MIL-101 (Fe) has a good adsorption effect. At the same time, Fe_3O_4@MIL-101 (Fe) can be separated rapidly by applied magnetic field after adsorption. It provides a simple and effective method for phosphate removal. (2) La-MOFs was synthesized by hydrothermal method, and XRD, FTIR, SEM and Zeta potential were used to characterize it. The adsorption process of adsorbents, pH value and adsorption time on phosphate adsorption process were investigated. The results show that the La-MOFs adsorption process is more consistent with the quasi two stage kinetic model and the Langmuir isotherm model. It is concluded that the adsorption mechanism is electrostatic attraction and ligand exchange. In addition, the adsorption properties of La-MOFs on the phosphate root are much higher than that of Fe_3O_4@MIL-101 (Fe), indicating that the La-MOFs material has a phosphate adsorption. Great potential. (3) hydrothermal synthesis of NH2-La-MOFs material and characterization by XRD, FTIR, SEM, energy dispersive X ray spectroscopy (EDX) and Zeta potential. The properties of NH2-La-MOFs adsorbed on phosphate root were investigated and the effects of adsorbents on the dosage, pH value and adsorption time were investigated. The results showed that the adsorption effect of the material on phosphate was good and accords with the results. The quasi two order kinetics and the Langmuir adsorption isotherm model were simulated. The adsorption of NH2-La-MOFs on the adsorption of phosphoric acid was proved by the continuous on line in situ attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) experiment on the NH2-La-MOFs.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ424;X52

【参考文献】