Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 148, Issue -, Pages 1298-1306Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.10.105
Keywords
Metal ions removal; Alginate-based hydrogel; Graphitic carbon nitride; Function integration
Funding
- National Key Research and Development Program of China [2017YFB0308701]
- Dalian Leading Talents Project [2018-192]
- National Natural Science Foundation of China [21676039]
- State Key Laboratory of Bio-Fibers and Eco-Textiles [2017kfkt12]
- Innovative Talents in Liaoning Universities and Colleges [LR2017045]
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The removal of heavy metal ions is of great significance to the friendly development of the environment. Herein, alginate modified graphitic carbon nitride composite hydrogels (g-C3N4/SA) were successfully synthesized through a facile cross-linking polymerization method. This novel composite hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS). The effects of different conditions were examined such as pH, initial concentration and contact time. It demonstrated that this integration process significantly improved the adsorption capacity of each component to targeted metal ions and solved the recycling and separation problem of g-C3N4, which is powdery sorbent and hard to recycle after adsorption. The calculated maximum adsorption capacity of Pb(II), Ni(II) and Cu(II) were 383.4, 306.3 and 168.2 mg g(-1), respectively. Adsorption isotherms studies showed that the equilibrium adsorption data fitted well to the Langmuir model and the adsorption kinetic data described well with the pseudo-second-order model according to kinetics studies. More significantly, g-C3N4/SA showed excellent regeneration ability and repeatedly utilized at least five cycles without obvious adsorption capacity loss. As-fabricated g-C3N4/SA can be considered as a potential sorbent for highly effective adsorption of Pb(II), Ni(II) and Cu(II) ions from contaminated water. (C) 2019 Elsevier B.V. All rights reserved.
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