Bioreduction of Cr(VI) by Bacillus sp. QH-1 isolated from soil under chromium-containing slag heap in high altitude area

Xu, Fen; Ma, Teng; Shi, Lei; Zhang, Junwen

doi:10.1007/s13213-013-0746-2

Cited by 27 publications

(3 citation statements)

References 33 publications

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“…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: Methodsmentioning

confidence: 99%

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

confidence: 99%

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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“…Although the efficiency of 99.65% ± 0.07% at 25 • C seemed satisfactory, the outlet Cr(VI) concentration of 0.35 ± 0.07 mg L −1 exceeded the maximum contaminant level of 0.05 mg L −1 for fisheries, drinking, ground, and surface waters. A higher temperature (e.g., 45 • C) could impair the function of ChrR and dramatically reduce the Cr(VI) removal efficiency [44]. Thus, the operating temperature of the experiment with the immobilized ChrR biosystem was controlled at 35 • C. Figure 4C presents the effect of the inlet Cr(VI) concentration on the continuous treatment of synthetic Cr(VI)-containing wastewater.…”

Section: Effects Of Operating Parameters On Continuous Cr(vi) Removal By Immobilized Chrr Biosystemmentioning

confidence: 99%

Operational Characteristics of Immobilized Ochrobactrum sp. CUST210-1 Biosystem and Immobilized Chromate Reductase Biosystem in Continuously Treating Actual Chromium-Containing Wastewater

Wang¹,

Tsai

Chiu

et al. 2020

Applied Sciences

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Cr(VI) detoxification by biotreatment is considered one of the most practical detoxification methods, especially at low-to-medium concentrations. Although the capabilities of chromium-reducing bacteria and related enzymes in removing Cr(VI) have been explored, little is known about their differences in engineering applications. In this study, Ochrobactrum sp. CUST210-1 was isolated and its chromate reductase identified and separated as biological elements in biosystems developed for Cr(VI) removal. Results indicate that intracellular Cr(OH)3(s) accounted for 88.01% of Cr(VI) reduction product, and a possible reduction mechanism was exposed. The chromate reductase in Ochrobactrum sp. CUST210-1 was ChrR protein, and its crystal structure was revealed. The toxicity of Cr(VI)-containing wastewater was decreased by 57.8% and 67.0% (at minimum) by the CUST210-1 strain and ChrR, respectively. The Ochrobactrum sp. CUST210-1 biosystem demonstrated good adaptability to pH (7–9), and the ChrR biosystem exhibited high removal efficiency (>98.2%) at a wide range of temperatures (25 °C–40 °C). The outlet Cr(VI) concentration of the CUST210-1 biosystem met the industrial discharge limit of 0.5 mg L−1 when the inlet Cr(VI) concentration in the actual Cr(VI)-containing wastewater was <430 mg L−1. The stricter water quality standard of 0.05 mg L−1 could be complied with by the immobilized ChrR biosystem when <150 mg L−1 Cr(VI) concentration was introduced. These developed biosystems can be used in the bioremediation of various Cr(VI)-contaminated wastewaters. Regarding capital costs, those of the CUST210-1 biosystem were higher. To our knowledge, this is the first report comparing differences in the economic and operational characteristics of bacteria and enzyme biosystems for Cr(VI) removal.

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Electrostatic Self-assembly Aided Synthesis of CdS/Cs3PW12O40 Hybrids for Photocatalytic Reduction of Cr(VI)

Hong

et al. 2020

Water Air Soil Pollut

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Bioreduction of Cr(VI) by Bacillus sp. QH-1 isolated from soil under chromium-containing slag heap in high altitude area

Cited by 27 publications

References 33 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

Operational Characteristics of Immobilized Ochrobactrum sp. CUST210-1 Biosystem and Immobilized Chromate Reductase Biosystem in Continuously Treating Actual Chromium-Containing Wastewater

Electrostatic Self-assembly Aided Synthesis of CdS/Cs3PW12O40 Hybrids for Photocatalytic Reduction of Cr(VI)

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