Journal
APPLIED SURFACE SCIENCE
Volume 420, Issue -, Pages 970-981Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.05.179
Keywords
Graphene oxide; Functionalization; Fe3O4@SiO2@CS-TETA-GO; Adsorption; Cu(II) ions; Methylene blue (MB)
Categories
Funding
- National Natural Science Foundation of China [21176102, 21176215, 21476136]
- Natural Science Foundation of Jiangsu Province [BK20131100]
- Connotation Construction Project of SUES [Nhky-2015-05]
- Science and Technology Commission of Shanghai Municipality [15430501200]
- Sino-German Center for Research Promotion [GZ935]
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The graphene oxide (GO) functionalized by Fe3O4@SiO2@CS-TETA nanoparticles, Fe3O4@SiO2@CS-TETA-GO, was firstly fabricated in a mild way as a novel adsorbent for the removal of Cu(II) ions and methylene blue (MB) from aqueous solutions. The magnetic composites showed a good dispersity in water and can be conveniently collected for reuse through magnetic separation due to its excellent magnetism. When the Fe3O4@SiO2@CS-TETA-GO was used as an absorbent for the absorption of MB and Cu(II), the adsorption kinetics and isotherms data well fitted the pseudo-second-order model and the Langmuir model, respectively. Under the optimized pH and initial concentration, the maximum adsorption capacity was about 529.1 mg g(-1) for MB in 20 min and 324.7 mg g(-1) for Cu(II) in 16 min, respectively, exhibiting a better adsorption performance than other GO-based adsorbents reported recently. More importantly, the synthesized adsorbent could be effectively regenerated and repeatedly utilized without significant capacity loss after six times cycles. All the results demonstrated that Fe3O4@SiO2@CS-TETA-GO could be used as an excellent adsorbent for the adsorption of Cu(II) and MB in many fields. (C) 2017 Elsevier B.V. All rights reserved.
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