期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 477, 期 -, 页码 35-41出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2015.03.048
关键词
Graphene; Tannic acid; Rhodamine B; Adsorption Kinetics
资金
- Natural Science Foundation of China [21275105]
- China Postdoctoral Science Foundation [2013M531961]
- National Key Scientific Instrument and Equipment Development Special Fund
- National Major Scientific Instrument and Equipment Development Special Fund [2011YQ0301130103]
A facile and green method was employed to synthesize the tannic acid functionalized graphene nanocomposite (TA-G) using tannic acid as reducing as well as capping reagent which could alter graphene surface physicochemical properties to improve the adsorption efficiency. Then the as-prepared TA-G was used as adsorbent to investigate the adsorption behavior for rhodamine B (RB). Due to the intensive pi-pi stacking interaction and electrostatic attraction, TA-G exhibited fine adsorption performance for RB. The adsorption isotherm fitted Langmuir model well and the theoretical maximum of adsorption capacity calculated by Langmuir model was 201 mg g(-1) which was approximately in a close agreement with the experimental measured data. The kinetics of adsorption was consistent with the pseudo-second-order model perfectly and chemisorption was the speed limit step. Therefore, the as-prepared TA-G nanocomposite would be an ideal adsorbent for the removal of RB in aqueous solution and opened a new door to broaden the potential applications of graphene in environmental research. (C) 2015 Elsevier B.V. All rights reserved.
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