Bioleaching and electrochemical property of marmatite by Leptospirillum ferrooxidans

Ban, Jin-rong; Gu, Guohua; Hu, Ke-ting

doi:10.1016/s1003-6326(13)62490-5

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…19 Therefore, it is more suitable for bio-dissolution. [20][21][22] Some recent studies have shown the interactions of different sulde minerals in sulfuric acid and also in the presence of bacteria. Zhao et al 23 reported that bornite decreased the oxidation reduction potential (ORP) and maintained it at an appropriate range (380-480 mV vs. Ag/AgCl) to promote chalcopyrite (A) dissolution; however, this caused the redox potential to be out of the optimum range and inhibited chalcopyrite (B) dissolution in the presence of L. ferriphilum.…”

Section: Introductionmentioning

confidence: 99%

Interactions between marmatite and bornite during the oxidative dissolution process in abiotic and biotic systems

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Interactions between marmatite and bornite during the oxidative dissolution process in abiotic and biotic systems

et al. 2019

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“…Moreover, the negative mutant #22 showed higher leaching capacity than Ni1-3 ( Figure 2E ), suggesting that the divergent extracellular electron transfer (EET) pathway may be involved between the AMR degradation and the cathodic material leaching. Practically speaking, using mutant #21 for cathodic material bioleaching would be a better way than the traditional bioleaching methods by using obligate and acidophilic chemoautotrophs mostly ( Ban et al, 2013 ), which would greatly save the operation time and capital costs, because the latter method may take 12–14 days to get only 30% Ni and 40% Co leached out ( Xin et al, 2016 ). These results suggested that Ni1-3 and the mutants could be promising candidates for bioremediation in industrial scale.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Bioremediation Potential of Shewanella decolorationis RNA Polymerase Mutants and Evidence for Novel Azo Dye Biodegradation Pathways

et al. 2022

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Bioremediation has been considered as a promising method for recovering chemical polluted environments. Here Shewanella decolorationis strain Ni1-3 showed versatile abilities in bioremediation. To improve the bioremediation activity, RNA polymerase (RNAP) mutations of strain Ni1-3 were screened. Eleven mutants were obtained, of which mutant #40 showed enhanced Amaranth (AMR) degradation capacity, while mutant #21 showed defected capacity in AMR degradation but greatly enhanced capacity in cathodic metal leaching which is three to four times faster than that of the wild-type (WT) strain Ni1-3, suggesting that different pathways were involved in these two processes. Transcriptional profiling and gene co-expression networks between the mutants (i.e., #40 and #22) and the WT strain disclosed that the non-CymA-Mtr but cytochrome b- and flavin-oxidoreductase-dominated azo dye degradation pathways existed in S. decolorationis, which involved key proteins TorC, TorA, YceJ, YceI, Sye4, etc. Furthermore, the involvement of TorA was verified by trimethylamine N-oxide reduction and molybdenum enzyme inhibitory experiments. This study clearly demonstrates that RNAP mutations are effective to screen active microbial candidates in bioremediation. Meanwhile, by clarifying the novel gene co-expression network of extracellular electron transfer pathways, this study provides new insights in azo dye degradation and broadens the application of Shewanella spp. in bioremediation as well.

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“…The copper extraction capability of L. ferriphilum YTW315 was analyzed by Zhang et al and revealed that 44.56% of copper was recovered after 30 days, however, in this study 45.7 ± 3.5% of copper was extracted after 8 days of incubation by L. ferriphilum . The impact of several variables on marmatite dissolution by pure L. ferrooxidans was studied by Ban et al and reported that the zinc extraction increases with decrease of pulp density. Furthermore, our findings revealed that the iron and sulfur‐oxidizing bacterial isolate At.…”

Section: Discussionmentioning

confidence: 99%

Culture‐dependent hunt and characterization of iron‐oxidizing bacteria in Baiyin Copper Mine, China, and their application in metals extraction

Sajjad

Zheng

et al. 2018

J Basic Microbiol

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The exploration of microbial diversity in extremely acidic habitats has provided a vital base for the progression of minerals biotechnology. Three indigenous ironoxidizing acidophilic bacterial strains were isolated through serial dilution of enriched bacterial culture from Baiyin Copper Mine Stope, China. The morphological, biochemical, physiological, and phylogenetic characteristics of isolates were investigated. These isolates were motile, Gram-negative, and curved shape with pleomorphism except isolate WG101 that was a straight rod. The optimum growth pH and temperature for all isolates were 1.5 and 30°C, respectively, and showed extreme acidophilic nature. All the isolates showed obligate chemoautotrophic nature and used ferrous iron and pyrite as an energy source, however, isolates WG102 and WG103 were unable to use sulfur, while isolate WG101 could use elemental sulfur and reduced inorganic sodium thiosulfate as an energy source. The phylogenetic analyses based on 16S rRNA sequences revealed that the isolates WG101, WG102, and WG103 were homologous with Acidithiobacillus ferrooxidans strain AS2 (99%), Leptospirillum ferriphilum strain YSK (98%), and Leptospirillum ferrooxidans strain L15 (98%), respectively. These bacterial isolates showed efficient copper and zinc dissolution from the ore. The metals dissolution rate of At. ferrooxidans strain WG101 was 54.5 ± 4.33% (copper) and 49.6 ± 5% (zinc). The metals recovery rate of L.ferriphilum strain WG102 was 45.7 ± 3.5% (copper) and 40.5 ± 2.5% (zinc). The recovery rate of copper and zinc was 49.6 ± 4% and 46.5 ± 3% respectively in the case of L. ferrooxidans strain WG103. The findings of this study are consistent with the notion that the indigenous bacteria are more efficient in minerals dissolution. K E Y W O R D SAcidithiobacillus ferrooxidans, Baiyin Copper Mine, bioleaching, Leptospirillum ferriphilum, Leptospirillum ferrooxidansAbbreviations: AMD, acid mine drainage; EPS, exopolysaccharide; ORP, oxidation-reduction potential.

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Bioleaching and electrochemical property of marmatite by Leptospirillum ferrooxidans

Cited by 16 publications

References 21 publications

Interactions between marmatite and bornite during the oxidative dissolution process in abiotic and biotic systems

Interactions between marmatite and bornite during the oxidative dissolution process in abiotic and biotic systems

Enhanced Bioremediation Potential of Shewanella decolorationis RNA Polymerase Mutants and Evidence for Novel Azo Dye Biodegradation Pathways

Culture‐dependent hunt and characterization of iron‐oxidizing bacteria in Baiyin Copper Mine, China, and their application in metals extraction

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