Synthesis and characterization of MgAl- layered double hydroxide with graphene oxide intercalation: Application in lead removal from spent batteries effluent

New-energy batteries are being developed so quickly leaving behind a challenge of lead contamination from spent batteries. Many adsorbents were developed to eliminate lead from the wastewater, layered double hydroxide (LDH) is one of them. A super adsorbent Graphene Oxide (GO) intercalated MgAl-LDH (GO-LDH) was specially designed and synthesized as effective and selective lead adsorption. The GO-LDH was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM). XRD result shows an increase in d-spacing corresponding to the (003) plane of LDH. A disappearance of the COOH group stretching in the FTIR spectrum of GO-LDH was observed in the FTIR spectrum. These results confirm the intercalation of GO between the basal plane of MgAl-LDH. To fit the adsorption isotherm, the Langmuir model was utilised, yielding pseudo-second-order rate kinetics with a maximum sorption capacity of 1034 mg/g at 50 °C and pH 6.0. These findings conclude that GO-LDH could be a promising application to treat heavy metal-containing wastewater with selective adsorption of lead.