The cross-talk between lateral sheet dimensions of pristine graphene oxide nanoparticles and Ni²⁺ adsorption

Abstract

This study investigated the removal of nickel(ii) ions by using two sizes of graphene oxide nanoparticles (GO – 450 nm and GO – 200 nm).

Effect of Ni Sulfate Residue on Oxygen Evolution Reaction (OER) in Porous NiFe@NiFe Layered Double Hydroxide

“…The peaks of free at 1043 and 1109 cm −1 , as well as interlayer SO 4 2− at 1120 cm −1 ions, are confirmed using Fourier transform infrared spectrometer attenuated total reflection (FT‐IR ATR, Figure S2, Supporting Information). [ 8 ] The interlayer peak indicates SO 4 2− ions are counter anions in NiFe LDH. In addition, the residues of NiSO 4 ·6H 2 O and FeSO 4 ·7H 2 O remain on the NiFe LDH layer, whereas the presence of NiSO 4 ·6H 2 O and FeSO 4 ·7H 2 O peaks is rarely detected for NNF‐W‐7 s, compared to the case of NNF‐D in the range of 10–20° (Figure S3, Supporting Information).…”

“…A peak of 979–987 cm −1 was examined, indicating the presence of NiSO 4 ·6H 2 O and FeSO 4 ·7H 2 O, and intercalated SO 4 2− anion, as shown in Figure 1c. [ 8b,9 ] In addition, peaks at 458 and 535 cm −1 , corresponding to Ni II ‐OH and Ni II ‐O, were detected, demonstrating that the NiFe LDH layer was deposited onto the NiFe surface. [ 10 ] In the case of NNF‐W‐7 s, the presence of NiFe LDH was also detected.…”

Removal of toxic hexavalent chromium via graphene oxide nanoparticles: study of kinetics, isotherms, and thermodynamics

“…Graphite oxide was produced from natural graphite using the modied Hummers' method. 8,[11][12][13] In Scheme 2, 1.0 g graphite was ground with 50.0 g of NaCl for a few minutes to exfoliate the graphite particles and reduce their dimensions. The ground graphite was added to warm water and collected using lter paper by suction ltration.…”

“…The epoxy (C-O) group becomes visible in the lower frequency region at 1400 cm −1 . 8,16 The FTIR spectrum of GO-Cr(VI) nanosystem was performed as shown in Fig. 2b.…”

“…The abundant oxygen groups such as –OH, –COOH and –CO distributed on their surfaces imparted during the oxidation of graphite. GO nanoparticles are successfully prepared in our chemical lab 8 for using as an adsorbent for the removal of hexavalent chromium Cr( vi ) from an aqueous solution.…”