Remediation of Co/Zn ions and their 60Co/65Zn radioactive nuclides from aqueous solutions by acid activated nanobentonite

Synergistic effect of nano‐bentonite and nanocadmium oxide doping concentrations on assembly, characterization, and enhanced gamma‐rays shielding properties of polypropylene ternary nanocomposites

“…9 In addition, the strong peak detected at 1074.95 cm −1 confirmed the silicate structure of the clay, as it is an indication of the presence of Si O in-plane. 44 Also, the typical composition of nano-bentonite can be seen in the two medium peaks at 464.78 and 605.59 cm −1 , which corresponded to both the Al O Si octahedral vibrations and those of Si O Si bending, respectively. Besides, the two weak peaks at 686.42 and 786.95 cm −1 are assigned to the out-of-plane vibrations of Al O and Si O.…”

“…43 The peak at 3622.74 cm −1 corresponded to the stretching vibrations of hydroxyl groups coordinated to the octahedral Al 3+ cations. 44 The FT-IR spectra of PP nanocomposites with the following compositions: 20.0 wt% CdO-NPs and 20.0 wt% NBent (Figure 3D), 40.0 wt% CdO-NPs (Figure 3E), and 40.0 wt% NBent (Figure 3F) showed almost all the characteristic absorption peaks corresponding to their constituents with some shifting in the wave number, as opposed to their pure form (Figure 3A-C). Peaks for the CdO-NPs and/or NBent function groups, which were not seen in pure PP (Figure 3A), clearly confirmed the successful chemical grafting of these nanofillers into PP matrix, as a result of the interactions between them at the processing temperature.…”

“…43 These diffraction peaks indicated the presence of the aluminum silicate structure of the NBent material, with its amorphous nature and confirmed that the sample was composed primarily of montmorillonite (M) in its hexagonal structure, quartz (Q) in its trigonal structure, and feldspar (F) with its albite structure, as the dominant clay mineral. 43,44 In case of the PP nanocomposites, samples with different wt% of CdO-NPs and NBent (Figure 2D-F) were compared with the XRD pattern of pure PP (Figure 2A). It was clearly observed that the expected additional characteristic reflection peaks of CdO-NPs and/or NBent would appear in their regular positions, according to their T A B L E 2 Chemical composition, thickness (X), density (ρ), and weight fraction elements of the prepared PP nanocomposite samples quantities, referring to the successful incorporation of these nanofillers in the PP matrix with little effect on its crystal structure.…”

“…9,46 The second stage in the 195 C-225 C range (loss = 4.532%) also marked the evaporation of water, but this time, these water molecules entrapped internally between the intercalated layers of NBent (the loss of molecular water from the exchange layer "interlayer water"). 44 The third stage extended to around 350 C with a loss equal to 3.549% of the total weight. It could be assigned to dihydroxylation of the silicate lattice, as well as the decomposition of the organic moiety present in the clay mineral.…”

Hazardous wastes treatment technologies

“…MahmoudAllam, Saad, El‐Khatib, and Soliman (2019) investigated the remediation of Co/Zn and 60 Co/ 65 Zn radioactive nuclides containing wastewater using sulfuric acid activated nanobentonite. The maximum Co/Zn adsorption capacity occurred at pH 6–7 and 20–30 min reaction time.…”