Journal
CHEMOSPHERE
Volume 215, Issue -, Pages 163-172Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.09.150
Keywords
Removal ratio; pi-pi interaction; Hydrophobic interaction; Oxygen-containing functional groups; Hydrogen bond
Categories
Funding
- Scientific Research Foundation for Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agroenvironment and Safe-product of China [QAK2016007]
- National Natural Science Foundation of China [41301316]
- National Key Technologies R & D Program of China [2018YFD0300103-4-2]
- Opening Foundation of State Key Laboratory of Soil and Sustainable Agriculture [Y412201418]
- Postdoctoral Foundation of Heilongjiang Province of China [LBH-Z15015]
- Program of Student Innovation Practice Training (SIPT) of Northeast Agricultural University [201810224031]
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Spent coffee grounds (SCG-1 and SCG-2) were used to study the adsorption of tetracycline (TC) antibiotics and the effects of adsorption time, initial pH, amount of adsorbent and ionic strength were detected. The TC adsorption isotherm on SCG-1 was compared with SCG-2. The results showed that the removal efficiencies of TC (50 mg/L) of SCG-1 and SCG-2 were 83.1% and 97.2%, respectively, shake for 2 h. The probability of adsorption is high and balances in about 20 min. The estimate of parameters got for TC from the Langmuir isotherm saturated adsorption quantity and adsorption balance constant were 64.89 mg/g, 0.0557 L/mg, respectively for SCG-1 and 123.46 mg/g, 0.4735 L/mg, respectively for SCG-2. The adsorption mechanism might be a pi-pi interaction that occurs in the interface by hydrogen bonding and the between the TC molecular and the SCGs. At last, we found that SCG has a high adsorption size for TC. (C) 2018 Elsevier Ltd. All rights reserved.
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