Adhikari Abhijit Krishna, Lin Kuen-Song
J Nanosci Nanotechnol. 2014 Apr;14(4):2709-17. doi: 10.1166/jnn.2014.8621.
Two metal organic frameworks of MOF-74 group (zinc and copper-based) were successfully synthesized, characterized, and evaluated for CO2 adsorption. The both samples such as MOF-74(Zn) and MOF-74(Cu) were characterized with FE-SEM for morphology and particle size, XRD patterns for phase structure, FTIR for organic functional groups, nitrogen adsorption for pore textural properties, and X-ray absorption spectroscopy for fine structural parameters and oxidation states of central metal atoms. CO2 adsorption isotherms of MOF-74 samples were measured in a volumetric adsorption unit at 273 K and pressure up to 1.1 bar. The MOF-74(Zn) and MOF-74(Cu) adsorbents have the pore widths of 8.58 and 8.04 angstroms with the BET specific surface areas of 1,474 and 1,345 m2 g(-1), respectively. CO2 adsorption capacities of MOF-74(Zn) and MOF-74(Cu) were 4.10 and 3.38 mmol x g(-1), respectively measured at 273 K and 1.1 bar. The oxidation state of central atoms in MOF-74(Zn) was Zn(II) confirmed by XANES spectra while MOF-74(Cu) was composed of Cu(I) and Cu(II) central atoms. The bond distances of Zn--O and Cu--O were 1.98 and 1.94 angstroms, respectively.
成功合成、表征并评估了两种MOF-74族金属有机框架（锌基和铜基）对二氧化碳的吸附性能。通过场发射扫描电子显微镜（FE-SEM）对MOF-74(Zn)和MOF-74(Cu)这两种样品的形态和粒径进行了表征，利用X射线衍射（XRD）图谱分析相结构，通过傅里叶变换红外光谱（FTIR）确定有机官能团，采用氮气吸附法测定孔隙结构性质，并运用X射线吸收光谱法分析中心金属原子的精细结构参数和氧化态。在体积吸附装置中于273 K和高达1.1 bar的压力下测量了MOF-74样品的二氧化碳吸附等温线。MOF-74(Zn)和MOF-74(Cu)吸附剂的孔径分别为8.58和8.04埃，BET比表面积分别为1474和1345 m2 g(-1)。在273 K和1.1 bar下测得MOF-74(Zn)和MOF-74(Cu)的二氧化碳吸附容量分别为4.10和3.38 mmol x g(-1)。X射线吸收近边结构（XANES）光谱证实MOF-74(Zn)中中心原子的氧化态为Zn(II)，而MOF-74(Cu)由Cu(I)和Cu(II)中心原子组成。Zn--O和Cu--O的键长分别为1.98和1.94埃。
