Abstract
AbstractAmino-functionalized graphene oxide (GO-NH2) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH2 with high surface area and numerous active sites can efficiently adsorb Cr(VI), Cu(II), Pb(II) and Cd(II) ions. The maximum adsorption capacities of GO-NH2 for Cr(VI), Cu(II), Pb(II) and Cd(II) were 280.11, 26.25, 71.89 and 10.04 mg g−1, respectively. The pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic processes. The experimental data agreed well with the pseudo-second-order kinetic equation, and the adsorption of heavy metals onto GO-NH2 occurs via chemical adsorption. The characteristics of Cr(VI), Cu(II), Pb(II) and Cd(II) in the GO-NH2 adsorption processes were analyzed using the Langmuir and Freundlich isotherm models. The adsorption processes of Pb(II) and Cd(II) on GO-NH2 were fit by the Langmuir model. The Freundlich isotherm model was well correlated to Cr(VI) and Cu(II). The GO-NH2 is a promising material for the removal of heavy metal ions from industrial wastewater. This study provides an effective pathway to process industrial wastewater, and the GO-NH2 has a good adsorption effect for the treatment of heavy metals in industrial wastewater.
Highlights
Amino-functionalized graphene oxide (GONH2) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface
A much rougher surface and more wrinkled structure are found in the GO-NH2 Scanning electron microscopy (SEM) image (Figure 1B), and yet, the image was very similar to the GO SEM image
The Transmission electron microscopy (TEM) image of GO (Figure 1C) shows that few-layered structures were formed with lateral dimensions of several micrometers and that the GO had a smooth surface with many wrinkles
Summary
Abstract: Amino-functionalized graphene oxide (GONH2) was synthesized by grafting (3-aminopropyl) triethoxysilane on the graphene oxide (GO) surface. The GO-NH2 is a promising material for the removal of heavy metal ions from industrial wastewater. Adsorption is regarded as one of the most promising technologies owing to its low operational cost and its environmentally friendly properties in the process of removing trace levels of heavy metal ions [4]. The effectiveness of various nanostructured adsorbents for the adsorption of heavy metal ions from contaminated water has been demonstrated [9,10,11,12]. To achieve a high adsorption efficiency and selectivity, GO has been modified with various functional groups to remove heavy metal ions in contaminated water. GO-NH2 exhibited a high adsorption capacity for heavy metal ion removal from real industrial wastewater
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