Biosorption of copper and nickel ions usingPseudomonassp. in single and binary metal systems

Abstract

AbstractPseudomonas sp. is a common kind of bacteria. In order to confirm whether Pseudomonas sp. can be used to remove the heavy metals from wastewater, the study investigated its adsorption capacity in single and Cu2+–Ni2+ binary systems. Experimental parameters affecting the metal uptake by Pseudomonas sp. in single system, such as initial solution pH, initial metal concentration, and contact time, were investigated. In single system, the highest adsorption yields of Cu2+ and Ni2+ by the Pseudomonas sp. were 44.78 mg Cu2+ g−1 and 336.84 mg Ni2+ g−1, respectively, at the optimum conditions for each metal. The kinetic and equilibrium experimental data of Cu2+ and Ni2+ ions in the single systems could be successfully described by Langmuir and Freundlich isotherms, whereas the adsorption isotherm was better described by a Langmuir model rather than a Freundlich model. In Cu2+–Ni2+ binary systems, the maximum adsorption amount of Cu2+ and Ni2+ were 38.62 mg Cu2+ g−1 and 323.47 mg Ni2+ g−1, respectively. It ...