期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 236, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.116278
关键词
Adsorption; Antibiotic; Heavy metal; Interfacial interaction; Combined contamination; Graphene oxides
资金
- National Natural Science Foundation of China [51978341, 51608275]
- Natural Science Foundation of Jiangsu Province of China [BK20190087]
- Project for Comprehensive Management of Tai Lake Water Environment in Jiangsu Province [TH2018201]
- National Major Project of Science and Technology Ministry of China [2017ZX07202-004]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX19-0189]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
This paper performed a comparative study on the adsorption of typical antibiotics (tetracycline and sulfadiazine) and heavy metals (Cu(II) and Zn(II)) onto graphene oxides (GO), a promising nano-adsorbent, from both experimental and theoretical viewpoints. Effects of solution chemistry parameters were studied. Interfacial interactions and geometries among contaminants and GO were clarified using experimental and computational tools. Interaction strength of contaminants towards GO followed the order of Cu(II) > Zn (II)>> tetracycline > sulfadiazine (coordination of heavy metal-GO in sp(3) regions; pi-pi stacking of antibiotic-GO in sp(2) and H-bonding in sp(3) regions). In the combined contaminants, heavy metals demonstrated enhancement effect for the adsorption capacities (Q(e)) for antibiotics, but antibiotics displayed slight promotion to Q(e) for heavy metals. Through coordination, the combined contaminants formed complexes, which preferred to be adsorbed onto GO's sp(3) regions with heavy metals acting like bridges and facing towards GO, instead of antibiotics directly interacting with GO. Coexisting salt ions, especially CO2+, inhibited the adsorption. Humic acid provided more sites for heavy metal uptake but competed with antibiotics for adsorption. After six adsorptionrelease cycles, re-adsorption capacities still kept high, implying the feasibility of GO on such sort of combined contaminants removal.
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