Green synthesis of graphene oxide‐MnFe₂O₄composites and their application in removing heavy metal ions

Abstract

The composites of graphene oxide (GO) decorated by MnFe 2 O 4 have been synthesised via a green and facile strategy that the pristine GO/MnSO 4 suspension prepared by Hummers method was directly utilised to convert into the GO-MnFe 2 O 4 composites. The as-prepared composites were characterised using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectra and X-ray photoelectron spectroscopy. The results indicated that the GO-MnFe 2 O 4 composites were successfully synthesised. The removal behaviours of Pb 2+ and Cu 2+ onto GO-MnFe 2 O 4 were investigated, which indicated that the composites exhibited great adsorption property in aqueous solution. The adsorption process could be fitted well by the pseudo-second-order model and Langmuir isotherm. The thermodynamic studies indicated that the adsorption process of Pb 2+ and Cu 2+ onto GO-MnFe 2 O 4 composites was spontaneous and endothermic in nature. Furthermore, the maximum adsorption capacities for Pb 2+ and Cu 2+ calculated from Langmuir model were about 263.85 and 103.41 mg/g at 318 K, respectively. Based on the results from the reusability experiments, the as-prepared GO-MnFe 2 O 4 composites could be used as a potential adsorbent for removing Pb 2+ and Cu 2+ ions from aqueous solutions.

Studies on the Antioxidant and Antibacterial Activities of In Situ Green Synthesized Graphene‐Gold Nanocomposite

“…[4] Accordingly, graphene incorporated with several metals (Ag, Cu, Pd, Zn, Mn, Fe, Ni, Pt, Cd, Co etc.) to produce variety of green synthesized NCs [5][6][7][8][9][10][11][12] that found large scope for research in catalytic reduction, [13] photocatalytic dye degradations, [14][15] electrochemical capacitors, [16] electrocatalyst, [17] supercapacitors, [18] and biological applications like antibacterial, [5][6][7][19][20][21] antioxidant, [21] antimicrobial activities [8-9,22,] with enhanced performances.…”

Anion intercalated graphite: a combined electrochemical and tribological investigation by in situ AFM

“…Nowadays, graphene is employed in many devices and in daily-life objects and technology (Randviir et al, 2014): lubricant (Berman et al, 2014), sensors (Nag et al, 2018;Qiao et al, 2019), green chemistry (Liao et al, 2020), biomedical fax: +39-2-2399-6126; e-mail: gianlorenzo.bussetti@polimi.it applications (Jiang et al, 2020), energy conversion (Chee et al, 2016), mechanics of composites (Papageorgiou et al, 2017) etc.…”