Selenite reduction and biogenesis of selenium-nanoparticles by different size groups of aerobic granular sludge under aerobic conditions

Sudharsan, G.; Sarvajith, M.; Nancharaiah, Y.V.

doi:10.1016/j.jenvman.2023.117482

Cited by 8 publications

(1 citation statement)

References 28 publications

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“…7 c). The presence of organic components, such as extracellular polymeric compounds or enzymes/molecules involved in the biogenesis of Se 0 particles, is indicated by the presence of C, O, N, P, and S elements in the biofilm, which in agreement with Sudharsan et al [ 60 ]. Reducing SeO 3 2− towards Se 0 deposition could illustrate the lowered toxicity.…”

Section: Resultssupporting

confidence: 84%

Electroactive Brevundimonas diminuta consortium mediated selenite bioreduction, biogenesis of selenium nanoparticles and bio-electricity generation

Sakr,

Khater,

El‑khatib

2024

J Nanobiotechnol

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In this study, highly selenite-resistant strains belonging to Brevundimonas diminuta (OK287021, OK287022) genus were isolated from previously operated single chamber microbial fuel cell (SCMFC). The central composite design showed that the B. diminuta consortium could reduce selenite. Under optimum conditions, 15.38 Log CFU mL-1 microbial growth, 99.08% Se(IV) reduction, and 89.94% chemical oxygen demand (COD) removal were observed. Moreover, the UV–visible spectroscopy (UV) and Fourier transform infrared spectroscopy (FTIR) analyses confirmed the synthesis of elemental selenium nanoparticles (SeNPs). In addition, transmission electron microscopy (TEM) and scanning electron microscope (SEM) revealed the formation of SeNPs nano-spheres. Besides, the bioelectrochemical performance of B. diminuta in the SCMFC illustrated that the maximum power density was higher in the case of selenite SCMFCs than those of the sterile control SCMFCs. Additionally, the bioelectrochemical impedance spectroscopy and cyclic voltammetry characterization illustrated the production of definite extracellular redox mediators that might be involved in the electron transfer progression during the reduction of selenite. In conclusion, B. diminuta whose electrochemical activity has never previously been reported could be a suitable and robust biocatalyst for selenite bioreduction along with wastewater treatment, bioelectricity generation, and economical synthesis of SeNPs in MFCs.

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Section: Resultssupporting

confidence: 84%