Simultaneous microbial reduction of vanadium (V) and chromium (VI) by Shewanella loihica PV-4

Wang, Guangyu; Zhang, Baogang; Li, Shuang; Meng, Yonggang; Yin, Chang-Cheng

doi:10.1016/j.biortech.2016.12.070

Cited by 113 publications

(57 citation statements)

References 42 publications

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“…Based on the results of this study and previous investigations, 8,24,37 we herein propose a mechanism for Cr(VI) reduction by S. xiamenensis in the presence of HNQ-GO composite as depicted in Fig. 6.…”

Section: Proposed Mechanism Of Cr(vi) Reduction By S Xiamenensis In supporting

confidence: 66%

“…xiamenensis cells was obtained (OD 600 ≈ 0.3) using anaerobic medium at 30 °C. Cellular components were separated according to previous methods . The free compounds secreted by active S .…”

Section: Methodsmentioning

confidence: 99%

“…In order to determine whether different cellular components of S. xiamenensis cells were responsible for intracellular Cr(VI) reduction, an enrichment culture of S. xiamenensis cells was obtained (OD 600 ≈ 0.3) using anaerobic medium at 30 ∘ C. Cellular components were separated according to previous methods. [22][23][24] The free compounds secreted by active S. xiamenensis cells (i.e. cell-free extract) were collected from the culture filtrate.…”

Section: Identification Of Intracellular Cr(vi) Reduction From Cellulmentioning

confidence: 99%

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Application of 2‐hydroxy‐1,4‐naphthoquinone‐ graphene oxide (HNQ‐GO) composite as recyclable catalyst to enhance Cr(VI) reduction by Shewanella xiamenensis

Luo

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Microbial reduction of Cr(VI) has been demonstrated as an environmentally friendly remediation protocol in recent years. In this study, the catalytic capability of soluble quinone compounds [i.e. anthraquinone‐2,6‐disulphonate (AQDS), 2‐hydroxy‐1,4‐naphthoquinone (HNQ) and ubiquinone (CoQ)] as well as an immobilized HNQ‐graphene oxide (GO) composite were evaluated for their ability to mediate Cr(VI) bioreduction by Shewanella xiamenensis. Additionally, the mechanism for Cr(VI) bioreduction was rigorously explored. RESULT At a test concentration of 0.02 mmol L−1, HNQ exhibited the highest efficiency for catalysing Cr(VI) bioreduction compared to AQDS and CoQ. During a 48 h test period, the highest removal efficiency (100%) of Cr(VI) (50 mg L−1) was exhibited in the presence of 0.015 mmol L−1 HNQ compared to biotic supplementations with 0.005, 0.010 and 0.020 mmol L−1 of HNQ. Furthermore, supplementation with 13.0 mg HNQ‐GO composite greatly enhanced Cr(VI) bioreduction compared to the biotic assay without any quinone compounds. Specifically, complete reduction of Cr(VI) was found in the first reaction cycle (following 72 h), compared to < 26% Cr(VI) reduction observed in the control group under the same reaction time. Moreover, HNQ‐GO composite was recovered and reused up to three times resulting in a ∼20% loss of catalytic efficacy during the third use. In the presence of HNQ‐GO composite, Cr(VI) bioreduction resulted predominantly from the enhancement of extracellular electron transfer mediated by HNQ and partly due to intracellular electron transfer processes occurring in the special metal respiratory system. CONCLUSION Our findings provide a promising alternative technology for remediating Cr(VI)‐polluted wastewater. © 2018 Society of Chemical Industry

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Section: Proposed Mechanism Of Cr(vi) Reduction By S Xiamenensis In supporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Identification Of Intracellular Cr(vi) Reduction From Cellulmentioning

confidence: 99%

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Application of 2‐hydroxy‐1,4‐naphthoquinone‐ graphene oxide (HNQ‐GO) composite as recyclable catalyst to enhance Cr(VI) reduction by Shewanella xiamenensis

Luo

et al. 2018

J of Chemical Tech & Biotech

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show abstract

“…Shewanella species, which are dissimilatory metalreducing bacteria widely distributed in sediment or seawater, grow optimally between 25 and 40 °C and can reduce metal ions via a special electron pathway called the Mtr pathway (Fredrickson et al 2008;Shi et al 2012;Wang et al 2017). Shewanella oneidensis MR-1, isolated from Oneida Lake, New York (Myers and Nealson 1988), has been reported to reduce Au 3+ into discrete spherical Au@NPs that are well dispersed with homogeneous sizes.…”

Section: Introductionmentioning

confidence: 99%

Biofabrication of gold nanoparticles by Shewanella species

2017

Bioresour. Bioprocess.

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Background: Shewanella oneidensis MR-1 (MR-1) and Shewanella xiamenensis BC01 (SXM) are facultative anaerobic bacteria that exhibit outstanding performance in the dissimilatory reduction of metal ions. Shewanella species have been reported to produce metal nanoparticles, but the mechanism and optimization are still not extensively studied and clearly understood. Herein, the effects of pH, biomass, gold ion concentration, and photoinduction are evaluated to optimize gold nanoparticle (Au@NP) production by Shewanella. Results:The highest amount of Au@NPs produced by SXM and MR-1 were 108 and 62 ppm, respectively, at pH 5 when 2.4 g/L biomass was immersed in 300 ppm gold ions and 50 mM lactate under a light intensity of 100 µmol/ m 2 /s. By scanning election microscopy and zeta potential analysis, the proposed mechanism of Au@NP formation was that Shewanella used lactate as electron donors for the Mtr pathway, stimulated by photosensitive proteins resulting in the nucleation of NPs on the cell membrane. Besides, the resting cells retained the ability for biofabrication of nanoparticles for nearly 25 days. Conclusions:The optimal conditions evaluated for Au@NPs production by Shewanella were biomass, pH, ions concentration, and photoinduction. To the best of our knowledge, this is the first attempt to explore a two-step mechanism for Au@NPs formation in Shewanella. First, the HAuCl 4 solution reacted with sodium lactate to form metallic gold ions. Second, the metallic gold ions were adsorbed onto the outer membrane of cell, and the formation of Au@NPs at the surface was triggered. Shewanella-based Au@NPs production could be a potential ecofriendly solution for the recovery of Au ions from secondary resources like industrial waste.

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“…For example, spherical palladium (Pd) nanoparticles with an approximate diameter of 6 to 8 nm are prepared in situ on the surface of titanium dioxide (TiO 2 ) nanotubes (TNTs) via S. oneidensis MR-1 under benign conditions to form a heterojunction structure with TNTs. [39][40][41][42] The Pd/TNT nanocomposites have demonstrated greater photocatalytic efficiency than single TiO 2 nanomaterials. Over the last few years, considerable research attention has been paid to developing non-noble metal catalysts for the reduction of 4-NP.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesis of Cu nanoparticles supported on carbon nanotubes and its catalytic performance under different test conditions

Huang

Shi

2020

J of Chemical Tech & Biotech

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BACKGROUND 4‐Nitrophenol (4‐NP) is used widely in pesticides and other areas, but it can cause adverse environmental effects. Thus, it is desirable to convert it to 4‐aminophenol (4‐AP). Microbial synthesis of nanomaterials has the characteristics of low cost and effective control of secondary pollution. The catalytic performance of biosynthesized nanocomposites of copper (Cu) and carbon nanotubes (CNTs) in reducing 4‐NP to 4‐AP was evaluated. RESULTS Here, Cu nanoparticles were supported in situ on CNT nanocomposites via Shewanella oneidensis MR‐1 to form Cu/CNT nanocomposites. The prepared Cu/CNTs nanocomposites were characterized by transmission electron microscopy, X‐ray photoelectron spectroscopy, Raman spectrometry, and energy dispersed X‐ray spectroscopy. The findings showed that the Cu nanoparticles were successfully synthesized on the surface of the CNTs and that they had a typical diameter of 4 to 10 nm and high crystallinity. The catalytic performance of the nanocomposites for the reduction of 4‐NP was evaluated under different initial concentrations of Cu/CNT, pH, and temperatures. The best catalytic performance, in which 99.5% 4‐NP was reduced, was obtained with 3 wt% Cu/CNT at 45 °C and pH of 10 within 80 min. Accordingly, 4‐NP degradation followed first‐order kinetics, and the rate constant (k) has been calculated to be 0.0532 min−1. The Cu/CNT nanocomposite exhibited high stability catalytic efficiency at 95.2% even after six reaction cycles. CONCLUSION The study demonstrates an environmentally friendly method for synthesizing non‐noble metal nanocomposites and using them for the catalytic reduction of 4‐NP. The method could be applied to prepare other efficient and reusable metallic nanocatalysts. © 2020 Society of Chemical Industry

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Simultaneous microbial reduction of vanadium (V) and chromium (VI) by Shewanella loihica PV-4

Cited by 113 publications

References 42 publications

Application of 2‐hydroxy‐1,4‐naphthoquinone‐ graphene oxide (HNQ‐GO) composite as recyclable catalyst to enhance Cr(VI) reduction by Shewanella xiamenensis

Application of 2‐hydroxy‐1,4‐naphthoquinone‐ graphene oxide (HNQ‐GO) composite as recyclable catalyst to enhance Cr(VI) reduction by Shewanella xiamenensis

Biofabrication of gold nanoparticles by Shewanella species

Biosynthesis of Cu nanoparticles supported on carbon nanotubes and its catalytic performance under different test conditions

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