Bioleaching of iron from laterite soil using an isolated Acidithiobacillus ferrooxidans strain and application of leached laterite iron as Fenton’s catalyst in selective herbicide degradation

Bhaskar, Sirivella Vijaya; Basavaraju, Manu; Sreenivasa, M. Y.

doi:10.1371/journal.pone.0243444

Cited by 8 publications

(2 citation statements)

References 62 publications

(82 reference statements)

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“…While the other haloalkaliphilic iron-reducers, namely Bacillus arsenicoselenatis and Bacillus selenitireducens have been quantitatively tested for Fe 3+ reduction, but no reduction rates have been reported (Blum et al, 1998). The well-known iron-reducer, Acidithiobacillus ferrooxidans reduces iron at 6.7 mM/day rate under acidic conditions of pH 2 (Bhaskar et al 2021). Notably, G. halelectricus iron reduction activity is on par with the other iron-reducers like Geothrix fermentans (1.9 mM/day) (Nevin and Lovley, 2002a), Geobacter metallireducens (1 mM/day), and Shewanella alga strain BrY (2.13 mM/day) (Nevin and Lovley, 2002b).…”

Section: Iron Cycling By G Halelectricus Via Bi-directional Eet Under...mentioning

confidence: 99%

The bidirectional extracellular electron transfer process aids iron cycling by Geoalkalibacter halelectricus in a highly saline-alkaline condition

Yadav,

Sadhotra,

Patil

2023

Appl Environ Microbiol

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Bidirectional extracellular electron transfer (EET) is crucial to upholding microbial metabolism with insoluble electron acceptors or donors in anoxic environments. Investigating bidirectional EET-capable microorganisms is desired to understand the cell-cell and microbe-mineral interactions and their role in mineral cycling besides leveraging their energy generation and conversion, biosensing, and bio-battery applications. Here, we report on iron cycling by haloalkaliphilic Geoalkalibacter halelectricus via bidirectional EET under haloalkaline conditions. It efficiently reduces Fe 3+ oxide (Fe 2 O 3 ) to Fe 0 at a 0.75 ± 0.08 mM/mg protein /d rate linked to acetate oxidation via outward EET and oxidizes Fe 0 to Fe 3+ at a 0.24 ± 0.03 mM/mg protein /d rate via inward EET to reduce fumarate. Bioelectrochemical cultivation confirmed its outward and inward EET capabilities. It produced 895 ± 23 µA/cm 2 current by linking acetate oxidation to anode reduction via outward EET and reduced fumarate by drawing electrons from the cathode (‒2.5 ± 0.3 µA/cm 2 ) via inward EET. The cyclic voltammograms of G. halelectricu s biofilms revealed redox moieties with different formal potentials, suggesting the involvement of different membrane components in bidirectional EET. The cyclic voltammetry and GC-MS analysis of the cell-free spent medium revealed the lack of soluble redox mediators, suggesting direct electron transfer by G. halelecctricu s in achieving bidirectional EET. By reporting on the first haloalkaliphilic bacterium capable of oxidizing and reducing insoluble Fe 0 and Fe 3+ oxide, respectively, this study advances the limited understanding of the metabolic capabilities of extremophiles to respire on insoluble electron acceptors or donors via bidirectional EET and invokes the possible role of G. halelectricu s in iron cycling in barely studied haloalkaline environments. IMPORTANCE Bidirectional extracellular electron transfer (EET) appears to be a key microbial metabolic process in anoxic environments that are depleted in soluble electron donor and acceptor molecules. Though it is an ecologically important and applied microbial phenomenon, it has been reported with a few microorganisms, mostly from nonextreme environments. Moreover, direct electron transfer-based bidirectional EET is studied for very few microorganisms with electrodes in engineered systems and barely with the natural insoluble electron acceptor and donor molecules in anoxic conditions. This study advances the understanding of extremophilic microbial taxa capable of bidirectional EET and its role in barely investigated Fe cycling in highly saline-alkaline environments. It also offers research opportunities for understanding the membrane components involved in the bidirectional EET of G. halelectricus . The high rate of Fe 3+ oxide reduction activity by G. halelectricus suggests its possible use as a biocatalyst in the anaerobic iron bioleaching process under neutral-alkaline pH conditions.

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Section: Iron Cycling By G Halelectricus Via Bi-directional Eet Under...mentioning

confidence: 99%

The bidirectional extracellular electron transfer process aids iron cycling by Geoalkalibacter halelectricus in a highly saline-alkaline condition

Yadav,

Sadhotra,

Patil

2023

Appl Environ Microbiol

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“…Then, this pregnant leaching solution containing copper will be processed by iron scrapings for cementation followed by electrolysis. In case of laboratory level findings, mesophilic, aerobic, iron and sulfur oxidizing microorganisms, anaerobic sulfur reducing bacteria were observed from sample collected on copper mines (S et al., 2021; Sisay Cheru, 2021). The mechanism will take place by oxidizing Fe(II) sulfide to Fe(III) sulfate on the cell wall of the bacteria.…”

Section: Industrial Application For Extraction Purposesmentioning

confidence: 99%

Recent bioleaching approaches employed for the extraction of metals in mining fields for the purpose of utilization and creating the sustainable future

Devi¹,

Sambasivam²

2023

Environmental Quality Mgmt

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Recovery of the resources is considered to be a significant thing in the perspective of saving the cost economically and also for sustainable future utilization efficiently. Metals are extracted by mining processes in mines located on all over the world to consummate the needs put forth by the developing society. But mining process was found to be possessing and creating negative impact on environment during the time of mining and even after closed completely. This negative impact mainly relies on the process which is employed during the extraction of metals. Chemical methods were conventionally used from then until today for the extraction purposes. But it was reported that it has been severely affecting the surroundings. So, many mining industries started to find out the way for shifting themselves towards eco‐friendly procedures. As a result, microorganisms are employed to promote the process towards non‐polluting and naturally sustainable way. This process of using microorganisms for the extraction purposes was termed as bioleaching. It is now regarded as one of the effective ways for extraction purposes, but in limited cases. So, rather than using the chemical leaching method which highly includes chemical reactions that may be toxic or non‐toxic, this bioleaching method could be followed for its cost‐effective nature. It is a more environmentally friendly method when compared with traditional methods of industrial mining. Bacterial and Fungal species were importantly used for carrying out bioleaching. This method has now become a possible thing because of biotechnological improvements and advancements. It is also worth to note here that many researches have been going on currently to study the diversity of this concept. This article mainly aims at elucidating the overall concept of bioleaching using microorganisms in the mining industry as well as its mechanisms, applications, recent advancements and its future expectations.

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Green synthesis of laterite iron-based nanocatalysts using Psidium guajava and Macaranga peltata plant extract for its catalytic application in Fenton’s oxidation of triclosan

Rashmishree

Bhaskar

Hari

et al. 2023

Clean Techn Environ Policy

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Bioleaching of iron from laterite soil using an isolated Acidithiobacillus ferrooxidans strain and application of leached laterite iron as Fenton’s catalyst in selective herbicide degradation

Cited by 8 publications

References 62 publications

The bidirectional extracellular electron transfer process aids iron cycling by Geoalkalibacter halelectricus in a highly saline-alkaline condition

The bidirectional extracellular electron transfer process aids iron cycling by Geoalkalibacter halelectricus in a highly saline-alkaline condition

Recent bioleaching approaches employed for the extraction of metals in mining fields for the purpose of utilization and creating the sustainable future

Green synthesis of laterite iron-based nanocatalysts using Psidium guajava and Macaranga peltata plant extract for its catalytic application in Fenton’s oxidation of triclosan

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