期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 332, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111667
关键词
MIL-53(Cr); Hierarchical pores; Tetracycline adsorption; Adsorption kinetics
类别
资金
- Province Key R&D Program of Jiangsu [BE2019735]
- National Key Research and Development Program [2019YFC1905804, 2017YFC0210903, 2017YFB0307304]
- National Natural Science Foundation of China [21606130, 21306089]
- Project '333' of Jiangsu Province [BRA2016418]
- State Key Laboratory of Materials-Oriented Chemical Engineering [ZK201610]
- Priority Academic Program Development of Jiangsu Higher Education In-stitutions (PAPD)
This paper synthesized hierarchically porous MIL-53(Cr) using in situ synthesis for the first time and investigated the influence of mesopores on tetracycline adsorption. The results showed that the high mesoporous volume improved the adsorption capacity of TC. Kinetic models were used to analyze the adsorption process, and it was found that the external mass transfer rate of TC on 20-AA-MIL-53(Cr) was significantly higher when the pore size was expanded. Additionally, the water stability test demonstrated the excellent water stability of 20-AA-MIL-53(Cr) for over 5 days.
Significant concerns have been raised over the adsorption of tetracyclines from aquatic environments. In this paper, hierarchically porous MIL-53(Cr) was synthesized by in situ synthesis for the first time and the influence of mesopores on tetracycline adsorption was investigated. Benefiting from the high mesoporous volume, more TC molecular could enter the channel to interact with adsorption sites, and the adsorption capacity of 20-AA-MIL-53 (Cr) for TC increased twelvefold, up to 148.5 mg/g. In addition, various kinetic models have also been used to investigate the adsorption process of tetracycline. Particularly, considering the molecular size of TC about 12.9 angstrom x 7.4 angstrom, Elovich and intraparticle diffusion kinetic models were used to testify that the external mass transfer of TC on 20-AA-MIL-53(Cr) was much higher than that on MIL-53(Cr) when the pore size was expanded to 2-3 nm. What's more, the results of water stability test revealed the excellent water stability of 20-AA-MIL-53(Cr) for over 5 days. This study described a simple method for the preparation of hierarchical porous MIL-53(Cr) and explored the effect of mesopores on the adsorption of TC, so as to propose that hierarchical porous MIL-53(Cr) can be used as a potential adsorbent in water adsorption treatment.
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