| Autor: |
Ibrahim MIM; Department of Soil Science, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt.; Department of Soil Physics and Chemistry, Soil, Water and Environment Research Institute (SWERI), The Agricultural Research Center (ARC), Giza 12619, Egypt., Awad EAM; Department of Soil Science, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt., Dahdouh SMM; Department of Soil Science, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt., El-Etr WMT; Department of Soil Physics and Chemistry, Soil, Water and Environment Research Institute (SWERI), The Agricultural Research Center (ARC), Giza 12619, Egypt., Marey SA; King Saud University, Riyadh 11451, Saudi Arabia., Hatamleh AA; Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia., Mahmood M; Center for Eco-Environment Restoration Engineering of Hainan Province, College of Ecology and Environment, Hainan University, Haikou 570228, China., Elrys AS; Department of Soil Science, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt.; Liebig Centre for Agroecology and Climate Impact Research, Justus Liebig University, 35390 Giessen, Germany. |
| Abstrakt: |
High concentrations of graphene oxide (GO), a nanoparticle substance with rapid manufacturing development, have the ability to penetrate the soil surface down to the mineral-rich subsurface layers. The destiny and distribution of such an unusual sort of nanomaterial in the environment must therefore be fully understood. However, the way the chemistry of solutions impacts GO nanoparticle adsorption on clay minerals is still unclear. Here, the adsorption of GO on clay minerals (e.g., bentonite and kaolinite) was tested under various chemical conditions (e.g., GO concentration, soil pH, and cation valence). Non-linear Langmuir and Freundlich models have been applied to describe the adsorption isotherm by comparing the amount of adsorbed GO nanoparticle to the concentration at the equilibrium of the solution. Our results showed fondness for GO in bentonite and kaolinite under similar conditions, but the GO nanoparticle adsorption with bentonite was superior to kaolinite, mainly due to its higher surface area and surface charge. We also found that increasing the ionic strength and decreasing the pH increased the adsorption of GO nanoparticles to bentonite and kaolinite, mainly due to the interaction between these clay minerals and GO nanoparticles' surface oxygen functional groups. Experimental data fit well to the non-linear pseudo-second-order kinetic model of Freundlich. The model of the Freundlich isotherm was more fitting at a lower pH and higher ionic strength in the bentonite soil while the lowest R 2 value of the Freundlich model was recorded at a higher pH and lower ionic strength in the kaolinite soil. These results improve our understanding of GO behavior in soils by revealing environmental factors influencing GO nanoparticle movement and transmission towards groundwater. |
