Adsorption behavior and mechanism of Hg(II) on highly stable Zn-based metal organic frameworks

BiaoZENG,ChaoXIONG,WeiWANG,GuoLIN,SongCHENG,JunCHANG

doi:10.1016/S1003-6326(22)66029-1

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 10: 3420 - 3433

DOI: https://doi.org/10.1016/S1003-6326(22)66029-1

Mining, Minerals Processing and Metallurgical Engineering

Adsorption behavior and mechanism of Hg(II) on highly stable Zn-based metal organic frameworks

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Biao ZENG^1,2, Chao XIONG³, Wei WANG^1,2, Guo LIN^1,2, Song CHENG⁴, Jun CHANG⁵

1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;
3. School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China;
4. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
5. College of Materials and Chemical Engineering, Tongren University, Tongren 554300, China

Online published: 2022-10-25

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Abstract

A novel adsorbent (MTZ-MOFs) was synthesized by a one-step reaction of zinc nitrate hexahydrate and 1-(2-dimethylaminoethyl)-1H-5-mercaptotetrazole to remove mercury from waste water. The results showed that MTZ-MOFs had excellent selectivity and repeatability for Hg(II), the optimum pH was 3.0, the maximum adsorption capacity was 872.8 mg/g, and the process was a spontaneous exothermic reaction. The adsorption behavior was chemisorption, which conformed to the pseudo-second-order kinetic and Freundlich isothermal model. Moreover, the adsorption mechanism showed that the adsorption process mainly depended on ion exchange and chelation, and the synergistic action of S and N atoms played a key role. So, MTZ-MOFs were an efficient adsorbent for mercury ion removal.

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BiaoZENG,ChaoXIONG,WeiWANG,GuoLIN,SongCHENG,JunCHANG . Adsorption behavior and mechanism of Hg(II) on highly stable Zn-based metal organic frameworks[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(10) : 3420 -3433 . DOI: 10.1016/S1003-6326(22)66029-1

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