Lead (II) adsorption from aqueous solutions onto modified ag nanoparticles: Modeling and optimization

Silver nanoparticles (Ag‐NPs) were synthesized viz. a green method in the presence of trisodium citrate as reducing agent and L‐cysteine as acceptor and capping agent for removal of Pb2+ ion. Central composite design (CCD) under response surface methodology (RSM) was applied for simultaneous optimization of the importance variables for synthesis of Ag‐NPs and its applicability for Pb2+ ion removal. The effects of the variables, such as pH, amount of reagent (such as L‐cysteine concentration) and contact time on the Pb2+ ion removal and subsequent elution steps were efficiently examined. The maximum of Pb2+ ion removal was obtained while concentration of sodium citrate, silver nitrate, lead nitrate and L‐cysteine was 0.05 M, 0.005 M, 27.78 mg L−1 and 0.25 M, respectively. The optimized resulting of Ag‐NP were applicable for removal of a large content of Pb2+ ion (105.4 mg g−1) from samples with high Pb2+ ion concentration in short reasonable time. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 743–749, 2016