Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 274, Issue -, Pages 145-155Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.03.062
Keywords
Graphene oxide; Oligomer; Pb(II) removal; Adsorption capacity; Selectivity
Categories
Funding
- Hunan Provincial Natural Science Foundation of China [14JJ1015]
- National Natural Science Foundation of China [51178173, 51202065, 51238002, 51272099, 51378187]
- Program for Innovation Research Team in University [IRT1238]
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A high performance sorbent, oligomer-linked graphene oxide (GO) composite, was prepared through simple cross-linking reactions between GO sheets and poly3-aminopropyltriethoxysilane (PAS) oligomers as crosslinking agents. The three-dimensional PAS oligomers prevented GO sheets from aggregation, provided foreign molecules with easier access, and introduced a large amount of amino functional groups. The morphology, structure and property of the PAS-GO composite were determined by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourie transform infrared (FTIR), X-ray diffractometer (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The adsorption performance of PAS-GO was investigated in removing Pb(II) ions from water. Compared to 3-aminopropyltriethoxysilane functionalized GO (AS-GO) which was prepared by the direct reaction between 3-aminopropyltriethoxysilane and GO, PAS-GO exhibited much higher adsorptivity toward Pb(II) with the maximum adsorption capacity of 312.5 mg/g at 303 K and furthermore the maximum adsorption capacity increased with increasing temperature. The adsorption could be conducted in a wide pH range of 4.0-7.0. Importantly, PAS-GO had a priority tendency to adsorb Pb, Cu and Fe from a mixed solution of metal ions, especially from a practical industrial effluent. (C) 2014 Elsevier B.V. All rights reserved.
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