Preparation of carboxylated graphene oxide for enhanced adsorption of U(VI)

Mechanically tough and highly stretchable poly(acrylic acid) hydrogel cross-linked by 2D graphene oxide

“…The stretching vibrations of alkoxy C-O occurred at 1055 cm À1 . [42][43][44] The spectral band information strongly validated the successful conversion of graphene oxide from graphite. The spectral differences between CGO and GO indicated the successful carboxylation of GO by the treatment of chloroacetic acid.…”

“…One was the reduction of intensity of the characteristic vibration band of C-O-C (1226 cm À1 ) and another was broadening of the absorption band of C]O groups at 1732 cm À1 . 33,34,44 The shiing of the broad peak of O-H stretching vibration to lower wavenumber 3393 cm À1 indicated the formation of a large number of carboxyl groups on GO surface. The appearance of the peaks at 3408 cm À1 , 1731 cm À1 and 1161 cm À1 in the spectrum of GOBC, were attributed to the stretching vibrations of N-H, C]O, and C-N bonds, respectively, of methacrylate groups.…”

Valmet Chiral Schiff‐Base Ligands And Their Copper(II) Complexes as Organo, Homogeneous and Heterogeneous Catalysts for Henry, Cyanosilylation and Aldol Coupling Reactions

“…In addition, the band at 1620 cm −1 , attributed to the C=C stretching vibrations represents a fingerprint of GO [35] . Upon the treatment with NaOH and ClCH 2 COOH, the increase of the intensity of the bands assigned to COOH (1722 cm −1 ) and CH 2 (2949 cm −1 ) groups confirms the anchorage of more carboxyl groups [36] . After the treatment with NaOH and ClCH 2 COOH the intensity of the C−O−C characteristic vibration bands (1070 cm −1 ) decreased and a new band at 1300 cm −1 corresponding to the in‐plane OH bending mode appeared [37] …”

Preparation of Graphene Oxide Composites and Assessment of Their Adsorption Properties for Lanthanum (III)

“…As shown in Figure 1, the surface of GO (a) prepared by the improved Hummers' method was smooth, with an accumulated flaky structure and numerous wrinkles. Compared with the GO, the surface of GOH (b) was relatively rough, with numerous irregular wrinkles and cracks, which were possibly due to the activation of the epoxide and ester groups, and the conversion of hydroxyl groups (−OH) into carboxyl groups (-COOH) [18,19]. As observed in the SEM image (c) of the pretreated DE, DE was discshaped with a smooth surface and regular porosity [20].…”