Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 368, Issue -, Pages 540-546Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.11.015
Keywords
Graphene oxide; Tetracycline; Antibiotics; Adsorption
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Funding
- National Natural Science Foundation of China [20875036, 21075050]
- Ministry of Science and Technology of Jilin Province, China [20080544]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Significant concerns have been raised over pollution of antibiotics including tetracyclines in aquatic environments in recent years. Graphene oxide (GO) is a potential effective absorbent for tetracycline antibiotics and can be used to remove them from aqueous solution. Tetracycline strongly deposited on the GO surface via pi-pi interaction and cation-pi bonding. The adsorption isotherm fits Langmuir and Temkin models well, and the theoretical maximum of adsorption capacity calculated by Langmuir model is 313 mg g(-1), which is approximately in a close agreement with the measured data. The kinetics of adsorption fits pseudo-second-order model perfectly, and it has a better rate constant of sorption (k), 0.065 g mg(-1) h(-1), than other adsorbents. The adsorption capacities of tetracycline on GO decreased with the increase in pH or Na+ concentration. The adsorption isotherms of oxytetracycline and doxycycline on GO were discussed and compared. Crown Copyright (C) 2011 Published by Elsevier Inc. All rights reserved.
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