一种阴离子型三维金属有机框架材料Cu(BDC-NH2)(4,4'-Bipy)0.5(BDC=对苯二甲酸根,Bipy=联吡啶)的制备及其对甲基紫的吸附性能

doi:10.11944/j.issn.1000-0518.2017.11.170015

摘要/Abstract

摘要：

以2-氨基对苯二甲酸、4,4'-联吡啶配体和硝酸铜为原料,在溶剂热的条件下,合成了一种的阴离子型三维金属有机框架(MOF)材料Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=对苯二甲酸根,Bipy=联吡啶)。通过IR、XRD、SEM、TG、N₂吸附法测比表面积等技术手段表征材料的结构和性能。研究了Cu(BDC-NH₂)(4,4'-Bipy)_0.5材料对甲基紫的吸附性能,探讨了甲基紫溶液的初始pH值和初始浓度以及不同吸附温度对吸附量的影响。结果表明,等温吸附模型符合Langmuir等温吸附模型,动力学符合拟二级动力学。热力学参数ΔG<0、ΔΗ<0和ΔS<0,表明Cu(BDC-NH₂)(4,4'-Bipy)_0.5对甲基紫的吸附是自发和放热的,在溶液pH=9,温度为20 ℃条件下,Cu(BDC-NH₂)(4,4'-Bipy)_0.5对甲基紫的吸附量为60.09 mg/g,说明Cu(BDC)(4,4'-Bipy)_0.5材料可以通过氨基改性,提高其对染料的吸附能力。

关键词: 三维金属有机骨架, 甲基紫, 吸附

Abstract:

2-Aminoterephthalic acid and 4,4'-bipyridine ligand with Cu²⁺ ion was used to prepared three-dimensional(3D) anionic metal-organic framework, namely Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=terephthalicacid, Bipy=bipyridine)by hydrothermal method. By X-ray powder diffraction pattern(XRD), Fourier transform infrared spectrum(FT-IR), scanning electron micrographs(SEM), thermogravimetry(TG), N₂ absorption-desorption experiment, the composition, structure, morphology, stability and toleration of Cu(BDC-NH₂)(4,4'-Bipy)_0.5 were characterized. The adsorption property of the composites on methyl violet(MV) from aqueous solution was investigated. The effects of experimental parameters including the temperature, initial pH value and initial concentration of MV solution were discussed. The experiment data could be well described by the Langmuir equations with pseudo-second-order kinetic model. Thermodynamic parameters ΔG<0, ΔH<0 and ΔS<0 indicate that the MV adsorption onto Cu(BDC-NH₂)(4,4'-Bipy)_0.5 is spontaneous and endothermic, and the maximum adsorption capacity value reaches 60.09 mg/g at 193 K and pH=9, indicating that the adsorption ability of Cu(BDC)(4,4'-Bipy)_0.5 towards dyes can be improved by using amino modification..

Key words: three-dimensional metal organic frameworks, methyl violetadsorption

龚文朋, 陈丹, 杨水金. 一种阴离子型三维金属有机框架材料Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=对苯二甲酸根,Bipy=联吡啶)的制备及其对甲基紫的吸附性能[J]. 应用化学, 2017, 34(11): 1321-1328.

GONG Wenpeng, CHEN Dan, YANG Shuijin. Adsorption of Methyl Violet by an Anionic Metal-Organic Framework Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=Terephthalicacid, Bipy=Bipyridine)[J]. Chinese Journal of Applied Chemistry, 2017, 34(11): 1321-1328.

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一种阴离子型三维金属有机框架材料Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=对苯二甲酸根,Bipy=联吡啶)的制备及其对甲基紫的吸附性能

Adsorption of Methyl Violet by an Anionic Metal-Organic Framework Cu(BDC-NH₂)(4,4'-Bipy)_0.5(BDC=Terephthalicacid, Bipy=Bipyridine)

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