“…65, No. SI:13B (2022) on Copper diffusion from the solution bulk to the bentonite/GO surface [46]. The concentration effect of Copper and Zinc ions on the removal rate of sorption at different times showed in Fig.…”
Section: Concentration Effectsmentioning
confidence: 99%
“…Hence, the optimum bentonite/ GO mass for adsorption of Cu(II) and Zn(II) ions are 0.5 g/L. Due to the agglomeration and particle interactions that limit active sites, a limitation of surface area was observed while increasing the adsorbent dosage [45,46].…”
The efficient sorbents for the heavy metal ions elimination from wastewater, like graphene and carbon nanotubes, are widely utilized in nanomaterials development. Clays (bentonite), activated carbon, metal oxides, and zeolites are commonly used as adsorbents in the heavy metals removal from solutions, such as Pb (II), Zn (II), Cd (II), Ni (II), as well as Cu (II). The graphene oxide (GO), in this study, was produced from graphite powder using a modified Hummer's technique, then altered by doping with acid-activated bentonite. SEM, EDAX, TEM, FTIR, and XRD characterized modified graphene oxide. The Cu(II) and Zinc (II) were adsorbed onto the modified GO using the simple batch-adsorption mode. pH values, initial concentration, adsorbent dosage, reaction temperature, and contact time were used to successfully vary the percentage of removed Zn(II) and Cu(II). At pH 5.6 under the ambient conditions ( according to the diagram of zero point charge ), over 45 min adsorption time, and 0.5 g/L adsorbent dose, the highest removal efficiency of Cu(II) and Zn(II) were 99.75% and 99.79%. The highest adsorption capacities of modified GO were 39.896 and 39.954 (mg/g) for Cu(II) and Zn(II), respectively, and the experimental values correlate well with the Langmuir isotherm.
“…Ra, and its shortlived daughter products [29][30][31][32][33][34][35]. The spectra of different samples were measured by a highresolution gamma-ray spectrometer (high-purity germanium (HPGe) detector).…”
Section: Sample Collection and Preparationmentioning
The Nubian sandstone aquifer's hydrogeophysical and natural radioactivity parameters at the Northwestern part of El Ain village, Sharq El Oweinat, Southwestern desert, Egypt are resolved using geophysical well logging and natural radioactivity techniques. The study aims to monitor the phenomenon of appearing an unusual high gamma-ray at a zone of high resistivity record. A nest of well logs is collected to assess how the phenomenon is widespread. Results of correlated well logs are clarified that this phenomenon at zone between 80 and 100 m and zone of 200 and 230m depth is noticed. The petro-physical properties are estimated from the recorded well logs. The results showed that the percentage of the average of effective porosity % varies between 20 and 28.2%, while average vary from 2 to 12.5 %, which indicates that the aquifer of Nubian Sandstone is classified as a clean aquifer. The natural radioactivities of the studied area in the rock samples were evaluated using high-purity germanium (HPGe) detector. The results indicated that the average value of Th-232 is (51.32 ±4.92%) Bq/kg, Ra-226 is (29.03 ± 4.68%) Bq/kg while the radioactivity concentration of K-40 exists only in one sample with low concentration.
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