Abstract
Increasing heavy metal pollution in water continues to endanger human health. The genus Shinella has potential for heavy metal bioremediation but has rarely been studied. In this study, we report that Shinella zoogloeoides PQ7 turns black in the presence of lead ions. Transmission electron microscopy (TEM), Scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) indicated that PbS nanoparticles (NPs) were synthesized by PQ7. Moreover, PQ7 was used as a biosorbent to remove Pb(II) from aqueous solutions. Biosorption performance was evaluated in terms of contact time, pH, biomass dosage and initial Pb(II) concentration. The equilibrium and kinetic data were consistent with the Freundlich isotherm model (R2 = 0.986) and pseudo-second-order model (R2 = 0.977), respectively. The maximum (qmax) Pb(II) adsorption reached 222.22 mg/g, which was higher than that of other bacteria reported in previous literature. SEM–EDS, XRD and Fourier transform infrared (FTIR) analyses also confirmed the adsorption of Pb(II) by the PQ7 cells. In conclusion, PQ7 is a promising strain in removing and recovering Pb(II) from wastewater.
Highlights
Heavy metals are among the most concerning environmental pollutants because of their toxicity and tendency to accumulate in the environment [1,2]
The maximum Pb(II) adsorption reached 222.22 mg/g, which was higher than that of other bacteria reported in previous literature
The Transmission electron microscopy (TEM) images indicated that nanoparticles were synthesized by Shinella zoogloeoides PQ7 in contrast to the control (Figure 2a, b)
Summary
Heavy metals are among the most concerning environmental pollutants because of their toxicity and tendency to accumulate in the environment [1,2]. Shinella zoogloeoides PQ7 was isolated from contaminated soil [17] It can resist quite a few heavy metals, such as zinc(II), copper(II), lead(II) and chromium(IV), and turn black in the presence of lead ions. This study was carried out to explore the reason for this color change in the presence of lead ions and the adsorption of Pb(II). To this end, transmission electron microscopy (TEM), scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) were employed to characterize the black materials. Kinetic models and isotherm models were used to investigate the adsorption behavior
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