Applicability of Goethite/Reduced Graphene Oxide Nanocomposites to Remove Lead from Wastewater

Abstract

Lead ion in drinking water is one of the most dangerous metals. It affects several systems, such as the nervous, gastrointestinal, reproductive, renal, and cardiovascular systems. Adsorption process is used as a technology that can solve this problem through suitable composites. The adsorption of lead (Pb(II)) on graphene oxide (GO) and on two goethite (α-FeOOH)/reduced graphene oxide (rGO) composites (composite 1: 0.10 g GO: 22.22 g α-FeOOH and composite 2: 0.10 g GO: 5.56 g α-FeOOH), in aqueous medium, was studied. The GO was synthesized from a commercial pencil lead. Composites 1 and 2 were prepared from GO and ferrous sulfate. The GO and both composites were characterized by using scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), Raman spectroscopy, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and dynamic light scattering (DLS). The adsorption capacity of Pb(II) on the GO and both composites was evaluated through adsorption isotherms. Composite 1 presented a significant agglomeration of α-FeOOH nanorods on the reduced graphene oxide layers. Meanwhile, composite 2 exhibited a more uniform distribution of nanorods. The adsorption of Pb(II) on the three adsorbents fits the Langmuir isotherm, with an adsorption capacity of 277.78 mg/g for composite 2200 mg/g for GO and 138.89 mg/g for composite 1. Composite 2 emerged as a highly efficient alternative to purify water contaminated with Pb(II).

Adsorption performance of Pb(II) ions on green synthesized GO and rGO: Isotherm and thermodynamic studies

“…Besides, graphite has a high intense of 2D band. The I 2D /I G ratio=0.36 indicates the presence of multilayers of graphite as reported similar [40]. By comparing graphite and GO, it is obviously seen that more intense D band observed in Figure 6b.…”

Zinc removal from synthetic waters using magnetite/graphene oxide composites

“…The sample was filtered with a polyvinylidene fluoride filter (pore: 0.45 μm). The retained solid was dried at 104°C for 15 h in a Venticell 404 Standard Blue Line stove (Gordon‐Nuñez et al, 2019).…”

Goethite Nanofibers /CNTs based Nanocomposites Synthesized by Free-Template Hydrothermal Method and their Physico-Chemical Properties for Energy Storage Application

“…Moreover, Goethite is used with reduced Graphene Oxide to remove lead from wastewater via adsorption technique. The lead ion is considered one of the most dangerous metals, as it affects several systems, such as nervous system, digestive system, kidneys, heart and blood vessels [19]. On the other hand, Biochar-supported Al-Substituted Goethite (BAG) is used also as a new absorbent in order to get rid of polluted nitrates in groundwater [20].…”