Removal of Hexavalent Chromium by <i>Aspergillus niger</i> Through Reduction and Accumulation

Xu, Hui; Hao, Ruixia; Xu, Xiyang; Ding, Yang; Lu, Anhuai; Li, Yinhuang

doi:10.1080/01490451.2020.1807659

Cited by 22 publications

(5 citation statements)

References 38 publications

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“…Next, the samples were treated with a series of resin acetone mixtures (V/V = 3:1, 1:1, and 1:3) for 0.5, 1.0, and 1.5 hr and left in pure resin overnight, and then new resin was added for 2 hr. The embedding process involved a 24‐hr incubation of the samples in new tubes under 60°C; then, the samples were sectioned in an ultrathin microtome to obtain a 90‐nm section, fixed on a copper network containing a micro‐sand carbon film (Xu et al, 2020). The samples were observed under FE‐TEM with a high voltage of 300 kV.…”

Section: Methodsmentioning

confidence: 99%

Removal of lead ions in an aqueous solution by living and modified Aspergillus niger

Hao

Yang

et al. 2020

Water Environment Research

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An indigenous lead‐tolerant fungal strain was isolated from lead‐contaminated soil and identified as Aspergillus niger, via 18S rRNA gene sequencing. We determined the adsorption and accumulation of Pb(II) by living A. niger and the adsorption of Pb(II) via modified A. niger. This strain resisted and removed 96.21%–100% Pb(II) ranging from 2 to 8 mmol/L Pb(II). Pb‐containing particles were observed outside of the cell, and lead was detected inside the cell under scanning electron microscopy and transmission electron microscopy. The process of measuring the adsorption ability of modified fungal biomass, freeze‐dried, high‐temperature, and alkali‐treated fungal samples was analyzed; they adsorbed 25.02%, 8.76%, and 15.05% Pb(II) under 8 mmol/L Pb(II) in 43, 10, and 10 hr, respectively. These three types of modified A. niger fit the pseudo‐second‐order model equation well. Practitioner points Isolation and identification of effective Pb(II) removal strain from the soil around Dexing lead‐zinc mine. The ability of living and modified Aspergillus niger to remove Pb(II) in an aqueous environment was evaluated. Lead distributions inside and outside the cell were analyzed by SEM and TEM. Kinetic models for modified biomass adsorbing Pb(II) were made for describing adsorption process.

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Section: Methodsmentioning

confidence: 99%

Removal of lead ions in an aqueous solution by living and modified Aspergillus niger

Hao

Yang

et al. 2020

Water Environment Research

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“…Besides that, fungi remediation is also a more lucrative option than bacterial remediation in remediating enzymes (Deshmukh et al, 2016;Shah, 2017). In addition, fungal cells can also live under high toxic metal concentrations with various ionisable sites and functional groups, allowing them to have the capability of broad absorption and specificity of PTEs (Khan et al, 2019;Xu et al, 2021). However, less bioremediation has been conducted using fungi as compared to other microorganisms due to longer duration required in the process (Vala et al, 2018;Zeng et al, 2015).…”

Section: Mycoremediationmentioning

confidence: 99%

Roles and significance of chelating agents for potentially toxic elements (PTEs) phytoremediation in soil: A review

Zulkernain

Uvarajan

2023

Journal of Environmental Management

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“…These substances, which typically encompass extracellular reductases and organic acids, play a crucial role in reducing Cr(VI) (Shi et al 2018). However, in the study of Aspergillus niger by Xu et al(2021) the CFE fraction was the most e cient in the reduction of Cr(VI). Also, CD and CFE have an important role in the reduction of Cr(VI), mainly attributed to the functional groups on the cells as well as intracellular reductase (Batool et al 2012).…”

Section: Location Of Cr(vi) Reductasementioning

confidence: 99%

Mechanism of Cr(VI) removal by efficient Cr(VI)-resistant Bacillus mobilis CR3

Ye,

Hao,

Shan

et al. 2023

World J Microbiol Biotechnol

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Cr(VI) is a hazardous environmental pollutant that poses signi cant risks to both ecosystems and human health. We successfully isolated a novel strain of Bacillus mobilis, strain CR3, from Cr(VI)-contaminated soil. The strain CR3 could show 86.70% removal capacity at 200 mg/L Cr(VI) and also good Cr(VI) removal capacity at different pH, temperature, coexisting ions and electron donor conditions. Different concentrations of Cr(VI) affected the activity of Bacillus mobilis CR3 cells and the removal rate of Cr(VI), and about 3.46% of total Cr was immobilized at the end of the reaction. The combination of SEM-EDS and TEM-EDS analysis showed that Cr accumulated both on the cell surface and inside the cells after treatment with Cr(VI). XPS analysis showed that both Cr(III) and Cr(VI) were present on the cell surface, and FTIR results indicated that the presence of Cr on the cell surface was mainly related to functional groups such as O-H, phosphate groups and -COOH. The removal of Cr(VI) was mainly bioreduction, which primarily occurred outside the cell. Metabolomics analysis revealed upregulation of ve metabolites, including phenol and L-carnosine, closely associated with Cr(VI) reduction, heavy metal chelation, and detoxi cation mechanisms. Additionally, numerous other metabolites linked to cellular homeostasis exhibited differential expression. The presence of Cr(VI) exerted inhibitory effects on division rate and in uenced critical pathways like energy metabolism, nucleotide metabolism, and amino acid synthesis and catabolism. These ndings reveal the molecular mechanism of Cr(VI) removal by strain CR3 and provide valuable insights for guiding the remediation of Cr(VI)-contaminated sites.

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Removal of Hexavalent Chromium by Aspergillus niger Through Reduction and Accumulation

Cited by 22 publications

References 38 publications

Removal of lead ions in an aqueous solution by living and modified Aspergillus niger

Removal of lead ions in an aqueous solution by living and modified Aspergillus niger

Roles and significance of chelating agents for potentially toxic elements (PTEs) phytoremediation in soil: A review

Mechanism of Cr(VI) removal by efficient Cr(VI)-resistant Bacillus mobilis CR3

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