Synthesis of graphene oxide grafted by diazanyl groups and its application in recovery of lead from lead-acid wastewater

Environ Sci Pollut Res Int. 2022 Nov 23. doi: 10.1007/s11356-022-24319-4. Online ahead of print.

Abstract

Heavy metal ion (HMI) in wastewater is a kind of resource that is wrongly placed. Recovery of heavy metal from lead-acid wastewater desires efficient and reusable functional materials. In this paper, graphene oxide-like with diazanyl groups (GOLA) was synthesized by a nucleophilic substitution reaction of graphene oxide-like with hydroxyl groups (GOLH) with diazane. GOLA exhibited good stability and recyclability in wastewater. The maximal adsorption capacity (qmax) values of GOLA for Pb(II), Cd(II), Cu(II), Ni(II), and Cr(III) ions were 505.80, 401.99, 83.48, 82.29, and 147.77 mg/g, respectively. The equilibrium time of GOLA adsorbing HMIs was 20 min. GOLA was employed to recover lead ions from lead-acid wastewater to give Pb(OH)2 and reusable water. Therefore, this paper provides a useful method of recycling lead from lead-acid wastewater.

Keywords: Diazanyl group; Graphene oxide; Heavy metal ion; Lead-acid wastewater; Recovery; Recyclability; Reusable water; Stability.