Synthesis of Metal–Organic Framework ZnOx-MOF@MnO2 Composites for Selective Removal of Strontium Ions from Aqueous Solutions | Zendy

Jung-Weon Choi | Zendy; Yoon-Ji Park | Zendy; Sang-June Choi | Zendy

Open Access

Synthesis of Metal–Organic Framework ZnO_x-MOF@MnO₂ Composites for Selective Removal of Strontium Ions from Aqueous Solutions

Author(s) -

Jung-Weon Choi,

Yoon-Ji Park,

Sang-June Choi

Publication year - 2020

Publication title -

acs omega

Language(s) - English

Resource type - Journals

ISSN - 2470-1343

DOI - 10.1021/acsomega.0c00228

Subject(s) - thermogravimetric analysis , adsorption , aqueous solution , metal organic framework , materials science , freundlich equation , sorption , fourier transform infrared spectroscopy , composite number , metal ions in aqueous solution , strontium , ion exchange , chemical engineering , specific surface area , composite material , inorganic chemistry , metal , nuclear chemistry , ion , chemistry , organic chemistry , metallurgy , catalysis , engineering

A Zn(II)-based metal-organic framework (MOF) compound and MnO 2 were used to prepare ZnO x -MOF@MnO 2 composites for selective Sr 2+ removal in aqueous solutions. The ZnO x -MOF@MnO 2 composites were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and Brunauer-Emmett-Teller surface area analysis. The functional groups, morphologies, thermal stabilities, and specific surface areas of the composites were suitable for Sr 2+ adsorption. A maximum adsorption capacity of 147.094 mg g -1 was observed in batch adsorption experiments, and the sorption isotherms were fit well by the Freundlich model of multilayer adsorption. Adsorption reached equilibrium rapidly in kinetic experiments and followed the pseudo-second-order kinetic model. The adsorption capacity of the ZnO x -MOF@MnO 2 composite with the highest MnO 2 content was high over a wide pH range, and the composite was highly selective toward Sr 2+ in solutions containing coexisting competing ions. Also, it has a good reusability for removing Sr 2+ .

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