Nickel and lead biosorption by Curtobacterium sp. FM01, an indigenous bacterium isolated from farmland soils of northeast Iran

• Published in: Journal of environmental chemical engineering Vol. 4; no. 1; pp. 950 - 957
• Main Authors: Masoumi, Fatemeh, Khadivinia, Elnaz, Alidoust, Leila, Mansourinejad, Zahra, Shahryari, Shahab, Safaei, Mahdieh, Mousavi, Amir, Salmanian, Ali-Hatef, Zahiri, Hossein Shahbani, Vali, Hojatollah, Noghabi, Kambiz Akbari
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2016
• Subjects: Biosorption; Curtobacterium sp. FM01; Kinetic; Lead; Nickel; Lead; Nickel; Biosorption; Kinetic; Curtobacterium sp. FM01
• ISSN: 2213-3437; 2213-3437
• DOI: 10.1016/j.jece.2015.12.025

The Curtobacterium sp. FM01 was isolated from farmland soils of northeast Iran and tested for eight heavy metals removal in aqueous solutions. The results showed that the metal removal (%) values for Ni (II) and Pb (II) with FM01 were significantly superior to the corresponding values with other metals. Accordingly, further analyses were concerted on the removal of Ni (II) and Pb (II) from aqueous solution in batch mode using dead biomass of Curtobacterium sp. FM01. Basic parameters such as pH (3–7), initial metal ion concentration (0.125–0.5mM), contact time (5–720min), varying biomass concentration (1–30mg) and temperature (10–50°C), were evaluated to determine the best biosorption conditions. The biosorption data are fitted well by the Langmuir biosorption isotherms for Ni (II) and Pb (II). The maximum biosorption capacity was found to be 186.60 for Pb (II) and 140.99mgg−1 for Ni (II). The biosorption process of Pb (II) onto the FM01 was followed second-order rate kinetics; however, kinetics of biosorption of Pb (II) followed both first- and second-order rate equations, indicating that the process involving the rate-controlling step is complex. Fourier transform infrared (FT-IR) analysis was carried out to characterize involvement of the functional groups of FM01 in the metal ions biosorption. Transmission electron microscopic (TEM) examination of metabolically active bacterial cells revealed surface morphological changed following metal ions biosorption. The observed electron-dense area on the cells is due to the presence of metal ions and contains the biosorbed ions. The study suggests that Curtobacterium sp. FM01 could be a promising candidate with a capacity to remove Ni (II) and Pb (II) from aqueous solutions.