期刊
MOLECULES
卷 24, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/molecules24244534
关键词
adsorption; desorption; mechanism; sugar cane bagasse; activated carbons; tetracycline
资金
- National Natural Science Foundation of China [51773159, 51303142]
- Outstanding Young and Middle-aged Scientific Innovation Team of Colleges and Universities of Hubei Province: Biomass chemical technologies and materials [T201908]
- Science and Technology Planning Program of Guangdong [2015A010105018]
- Special fund of Guangdong Academy of Science [2018GDASCX-0105]
Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl2 were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m(2) g(-1) with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m(3) g(-1), respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g(-1) under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by pi-pi interactions and cation-pi bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.
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