Abstract

In the present study, bimetallic aluminium (Al)-doped zinc oxide (AZO) nano-assemblies were synthesized for heavy metal removal and disinfection of wastewater. These bimetallic nanoparticles (NPs) were prepared by a simple co-precipitation method and characterized using FETEM, XRD, FT-IR, BET, Litesizer, and EDS. The designed NPs was tested for lead removal at various environmental conditions and optimized at pH 4 and 25 °C. The kinetic data were fitted well to the pseudo-second-order model and the process consisted of both surface adsorption and intraparticle diffusion. Al doping enhanced the surface charge of AZO by four folds as compared to ZnO, which improved colloidal stability and contributed towards its reusability. AZO exhibited excellent removal efficiency of 86% up to three adsorption-desorption cycles. The adsorption was found to be an exothermic and physiochemical process. The prepared AZO were also used to treat a real wastewater sample and found to effectively remove Pb(II) along with killing of bacterial inhabitants.

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