Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 192, Issue 2, Pages 620-627Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.05.103
Keywords
Manganese oxide nanoparticle; Manganese bioremediation; Bacillus sp.; Nanoparticle synthesis; Orthorhombic manganese oxide
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Funding
- Department of Biotechnology (Govt. of India)
- University Grant Commission, New Delhi
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A heavy metal resistant strain of Bacillus sp. (MTCC10650) is reported. The strain exhibited the property of bioaccumulating manganese, simultaneous to its remediation. The nanoparticles thus formed were characterized and identified using energy dispersive X-ray analysis (EDAX), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD) and atomic force microscopy (AFM). When the cells were challenged with manganese, the cells effectively synthesized nanoparticles of average size 4.62 +/- 0.14 nm. These were mostly spherical and monodispersed. The ex situ enzymatically synthesized nanoparticles exhibited an absorbance maximum at 329 nm. These were more discrete, small and uniform, than the manganese oxide nanoparticles recovered after cell sonication. The use of Bacillus sp. cells seems promising and advantageous approach. Since, it serves dual purposes of (i) remediation and (ii) nanoparticle synthesis. Considering the increasing demand of developing environmental friendly and cost effective technologies for nanoparticle synthesis, these cells can be exploited for the remediation of manganese from the environment in conjunction with development of a greener process for the controlled synthesis of manganese oxide nanoparticles. (C) 2011 Elsevier B.V. All rights reserved.
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