期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 36, 页码 24273-24280出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09377
关键词
antibiotics; graphene derivatives; interactions; pi-pi electron donor-acceptor effect; hydrogen-bond; electrostatic attraction
资金
- National Natural Science Foundation of China [51608275, 51278253]
- Natural Science Foundation of Jiangsu Province of China [BK20150981]
- Project for Comprehensive Management of Tai Lake Water Environment in Jiangsu Province [TH2014206]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [15KJB610009]
- Priming Scientific Research Foundation for Advanced Talents in Nanjing Normal University [2014103XGQ0196]
- Foundation of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Complex interactions between antibiotics and graphene-based materials determine both the adsorption performance of graphene-based materials and the transport behaviors of antibiotics in water. In this work, such interactions were investigated through adsorption experiments, instrumental analyses and theoretical DFT calculations. Three typical antibiotics (norfloxacin (NOR), sulfadiazine (SDZ) and tetracycline (TC)) and different graphene-based materials (divided into two groups: graphene oxides-based ones (GOs) and reduced GOs (RGOs)) were employed. Optimal adsorption pHs for NOR, SDZ, and TC are 6.2, 4.0, and 4.0, respectively. At corresponding optimal pHs, NOR favored RGOs (adsorption capability: similar to 50 mg/g) while SDZ preferred GOs (similar to 17 mg/g); All adsorbents exhibited similar uptake of TC (similar to 70 mg/g). Similar amounts of edge carboxyls of both GOs and RGOs wielded electrostatic attraction with NOR and TC, but not with SDZ. According to DFT-calculated most-stable-conformations of antibiotics-adsorbents complexes, the intrinsic distinction between GOs and RGOs was the different amounts of sp(2) and sp(3) hybridization regions: pi-pi electron donor-acceptor effect of antibiotic-sp(2)/sp(3) and H-bonds of antibiotic-sp3 coexisted. Binding energy (BE) of the former was larger for NOR; the latter interaction was stronger for SDZ; two species of TC at the optimal pH, i.e., TC+ and TC0, possessed larger BE with sp3 and sp2 regions, respectively.
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