Citation: WANG Rui, GONG Yong, XU Hai-Juan, WEI Shi-Yong, WU De-Yong. Characteristics and Adsorption Properties of Se(Ⅳ) for MOF-Fe Prepared with Different Conditioning Agents[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(5): 906-916. doi: 10.11862/CJIC.2018.110 shu

Characteristics and Adsorption Properties of Se(Ⅳ) for MOF-Fe Prepared with Different Conditioning Agents

WANG Rui ¹ ,
GONG Yong ² ,
XU Hai-Juan ¹ ,
WEI Shi-Yong ^1,3,, ,
WU De-Yong ^1,3

1.
Department of Chemistry and Environmental Engineering, Hubei University for Nationalities, Enshi, Hubei 445000, China
2.
Hubei Polytechnic Institute, Wuhan 432000, China
3.
Key Laboratory of Biologic Resource Protection and Utilization of Hubei Province, Enshi, Hubei 445000, China

Corresponding author: WEI Shi-Yong, weishiyong2007@126.com
Received Date: 6 December 2017
Revised Date: 28 January 2018

Figures(7)

MOF-Fe samples were prepared with HF, HCl, H₂O and NaAc as conditioning agents by hydrothermal method. The characteristics of the samples were studied by X-ray diffraction (XRD), Transmission electron microscope (TEM), N₂ adsorption/desorption, thermal analysis (TG/DTG and DTA) and proton potentiometric titration. Isothermal adsorption experiments of selenite (Se(Ⅳ)) on the samples were carried out. Crystal structure of all samples are same as MIL-100(Fe), and the morphology are octahedral, while the crystallinities and crystal orientations are different. The BET surface area are 1 683, 1 517, 1 641 and 1 734 m²·g^-1, respectively, and total pore volumes of the samples are decreased orderly. The micropore diameter are 1.27, 1.22, 1.22 and 1.17 nm for MOF-Fe(HF), MOF-Fe(HCl), MOF-Fe(H₂O) and MOF-Fe(NaAc). The temperature of decarboxylation of MOF-Fe(HF) is highest (415℃), while its carbonization temperature for benzene ring is lowest (462℃) compared with the others. A weight loss caused by redox between iron oxide and carbon appears in MOF-Fe(HCl), MOF-Fe(H₂O) and MOF-Fe(NaAc). The sequence of H⁺ consumed during the process of proton potentiometric titrations for samples is MOF-Fe(H₂O) > MOF-Fe(HCl) > MOF-Fe(HF)=MOF-Fe(NaAc), and pH value of zero point charge (pH_ZPC) are 3.1, 3.5, 3.6 and 3.5 accordingly. The sequence about the affinity of adsorption for Se(Ⅳ) on samples is MOF-Fe(NaAc) > MOF-Fe(HCl) > MOF-Fe(H₂O) > MOF-Fe(HF), and the maximum adsorption capacities (Q_m) are 77.69, 107.07, 117.40 and 87.15 mg·g^-1 correspondingly. The Q_m of Se(Ⅳ) on samples have positive correlation with density of hydroxyl for samples observably. This study reveals that the thermostability and density of active site of MOF-Fe are influenced by the conditioning agent when MOF-Fe was prepared. The HF could increase the strength of C-C between carboxyl and benzene ring, decrease carbonization temperature of benzene ring of MOF-Fe, and improve the thermostability of iron oxides after heating. While HCl and H₂O could improve the density of active site in samples, then the Q_m of Se(Ⅳ) adsorbed on MOF-Fe could be increased.
- MOF-Fe,
- conditioning agent,
- surface properties,
- adsorption,
- selenite
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