A facile method of synthesizing ammonia modified graphene oxide for efficient removal of uranyl ions from aqueous medium

Abstract

Adsorption of uranyl ions on NH3 modified graphene oxide at pH 6.

Boron Nitride based Ternary Nanocomposites with Different Carbonaceous Materials Decorated by Polyaniline for Supercapacitor Application

“…However, little shifting of peak position corresponding to C=C stretching of the quinoid and benzinoid rings in all the ternary composites can be due to interaction between π‐electron of PANI with other constituents of nanocomposites. Notably, intensity of the characteristic peak for C=O bond of GO at 1730 cm −1 is tremendously decreased for BN/GO/PANI, which can be attributed to the uniform deposition of polyaniline on well‐exfoliated GO and BN that restricts the C=O mode of vibration for GO . Similar phenomenon is also observed for BN too, where the peak intensity of B−N‐B bending mode drastically decreased in all ternary composites, as compared to BN alone.…”

Carbon nanotubes, graphene, and their derivatives for heavy metal removal

“…Temkin isotherm assumes that the heat of adsorption decreases linearly rather than logarithmic with coverage. Instead of pure GO, Verma et al [120] utilized ammonia-modified GO to enhance its adsorption selectivity towards U(VI), and the adsorption capacity was in good agreement with the Temkin model. Redlich-Peterson isotherm is a hybrid of the Langmuir and Freundlich isotherms.…”

The Role of Diamines in the Formation of Graphene Aerogels

“…FT-IR spectra of all aerogels showed, in comparison with the spectrum of GO, a significant decrease of the characteristic GO bands, and appearance of new bands from the incorporated diamines (see Figures 5, 6). The spectrum of pure GO showed a broad band at 3,400-3,200 cm −1 due to the OH stretching vibration (carboxyl, hydroxyl groups, or intercalated water), a shoulder at 1,710 cm −1 (carboxylic C=O stretch) and bands at 1,380 cm −1 (carboxylic O-H deformation vibration), 1,620 cm −1 (aromatic C=C stretches) (Ma et al, 2012;Hu et al, 2013;Verma and Dutta, 2015), 1,200 cm −1 and 1,046 cm −1 [usually assigned to phenolic C-OH stretches, as well as to epoxide (or alcoxy) stretches (Guo et al, 2009;Ma et al, 2012;Kellici et al, 2014)]. After reduction/functionalization, the bands assigned to oxygen groups at 1,046, 1,200, 1,710, and 3,200-3,400 cm −1 were significantly reduced in the spectra of rGO's.…”