Effective removal of Pb(II) ions using piperazine-modified magnetic graphene oxide nanocomposite; optimization by response surface methodology

Abstract

In this research, the piperazine-modified magnetic graphene oxide (Pip@MGO) nanocomposite was synthesized and utilized as a nano-adsorbent for the removal of Pb(II) ions from environmental water and wastewater samples. The physicochemical properties of Pip@MGO nanocomposite was characterized by X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDAX), Thermo-gravimetric analysis (TGA), Vibrating Sample Magnetometery (VSM) and Fourier-transform infrared spectroscopy (FT-IR) analysis. In this method, the batch removal process were designed by response surface methodology (RSM) based on a central composite design (CCD) model. The results indicated that the highest efficiency of Pb(II) removal was obtained from the quadratic model under optimum conditions of prominent parameters (initial pH 6.0, adsorbent dosage 7 mg, initial concentration of lead 15 mg L−1 and contact time 27.5 min). Adsorption data showed that lead ions uptake on Pip@MGO nanocomposite followed the Langmuir isotherm model equation and pseudo-second order kinetic model. High adsorption capacity (558.2 mg g−1) and easy magnetic separation capability showed that the synthesized Pip@MGO nanocomposite has great potential for the removal of Pb(II) ions from contaminated wastewaters.

Adsorption of Pb2+ and Cd2+ on the l‐cysteine‐functionalized graphene oxide/chitosan/polyvinyl alcohol hydrogel: Kinetic, isotherm, and thermodynamic study

“…Moreover, there were significant changes in the composition of oxygen and carbon of PCCFG after Pb 2+ adsorption, indicating that hydroxyl and carboxylic functional groups of the hydrogel are also responsible for the adsorption of Pb 2+ (Afolabi et al, 2021). The –N, –S, and –O atoms are responsible for adsorption of Pb 2+ (Alboghbeish et al, 2022), and the Pb 2+ might be coordinated or electrostatically attracted to –NH 2 , –SH, –COOH, and –OH functional groups (Figure 2b). Furthermore, disappearance of calcium and the significant change in the amount of aluminum after Pb 2+ adsorption indicate displacement and exchange of ions between Ca 2+ , Al 3+ , and Pb 2+ (Figure 5b).…”

Efficacious Removal of Flonicamid Insecticide from Water by GO@functionalized Calix[4]pyrrole: Synergistic Effect in Adsorption

“…The GACP decomposed in four steps. Firstly, the surface moisture vaporized and adsorbed water dehydrated at a temperature range from 32–183 °C with a 17.71 % weight loss, [55] and then decomposition of a thermally liable oxygen‐containing functional group on GO sheet in the temperature range from 183–457 °C with weight loss of 15.48 % was observed [56] . The weight loss (42.32 %) increased further in the temperature range 457–667 °C due to the decomposition of the carbon skeleton of GO and azocalix[4]pyrrole [57] .…”

Preconcentration and Removal of Pb(II) Ions from Aqueous Solutions Using Graphene-Based Nanomaterials

“…Piperazine-modified magnetic graphene oxide (Pip@MGO) nanocomposite also exhibits high adsorption capacity for lead ions, taking advantage of the coordinating capability of piperazine for metal ions and also the high surface area of graphene oxide [ 87 ]. At pH 6 it is equal to 558.2 mg/g.…”

“…Nickel ferrite based reduced graphene oxide (NFrGO) nanocomposite was used by Lingamdinne et al for the removal of Pb(II) ions from aqueous solution [ 87 , 88 ]. For its preparation, hydrazine hydrate was added to the GO dispersion, followed by nickel nitrate and ferric nitrate solution at pH ≥ 12 (at 2:1 molar ratio) in an inert atmosphere.…”