Mycoremediation of heavy metals: processes, mechanisms, and affecting factors

Kumar, Vinay; Dwivedi, S.K.

doi:10.1007/s11356-020-11491-8

Cited by 88 publications

(42 citation statements)

References 300 publications

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“…Fungal cells have high surface area with excellent HM-binding properties due to negative charges of functional groups present in cell wall components [31,32]. Additionally, fungi possess multiple antioxidant systems, metal transporters, metal-buffering molecules, metal-transformation enzymes, vacuolar sequestration abilities, and secrete metal-precipitating compounds; however, few mechanisms have been characterized in filamentous fungi [25,[33][34][35]. Not only are they cosmopolitan microorganisms, but they are also frequently more resilient than bacteria in metalliferous soils [36][37][38] and have the ability to colonize porous matrices with their hyphae networks.…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

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Filamentous fungi native to heavy metals (HMs) contaminated sites have great potential for bioremediation, yet are still often underexploited. This research aimed to assess the HMs resistance and Hg remediation capacity of fungi isolated from the rhizosphere of plants resident on highly Hg-contaminated substrate. Analysis of Hg, Pb, Cu, Zn, and Cd concentrations by X-ray spectrometry generated the ecological risk of the rhizosphere soil. A total of 32 HM-resistant fungal isolates were molecularly identified. Their resistance spectrum for the investigated elements was characterized by tolerance indices (TIs) and minimum inhibitory concentrations (MICs). Clustering analysis of TIs was coupled with isolates’ phylogeny to evaluate HMs resistance patterns. The bioremediation potential of five isolates’ live biomasses, in 100 mg/L Hg2+ aqueous solution over 48 h at 120 r/min, was quantified by atomic absorption spectrometry. New species or genera that were previously unrelated to Hg-contaminated substrates were identified. Ascomycota representatives were common, diverse, and exhibited varied HMs resistance spectra, especially towards the elements with ecological risk, in contrast to Mucoromycota-recovered isolates. HMs resistance patterns were similar within phylogenetically related clades, although isolate specific resistance occurred. Cladosporium sp., Didymella glomerata, Fusarium oxysporum, Phoma costaricensis, and Sarocladium kiliense isolates displayed very high MIC (mg/L) for Hg (140–200), in addition to Pb (1568), Cu (381), Zn (2092–2353), or Cd (337). The Hg biosorption capacity of these highly Hg-resistant species ranged from 33.8 to 54.9 mg/g dry weight, with a removal capacity from 47% to 97%. Thus, the fungi identified herein showed great potential as bioremediators for highly Hg-contaminated aqueous substrates.

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Section: Introductionmentioning

confidence: 99%

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Văcar

Covaci

Chakraborty

et al. 2021

JoF

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“…The presence of these negatively charged functional groups on the cell wall of the fungal biomass facilities the interaction with the positive charges of copper ions via electrostatic attraction. This interaction of metal with the surface ligands of biomass provides the adsorption process, holding copper ions inside the pores of the biomass [ 2 , 18 ]. Similar results are described in others studies reported in the literature [ 76 – 80 ].…”

Section: Resultsmentioning

confidence: 99%

“…The fungal cell walls are complex macromolecular structures predominantly consisting of chitin, glycans, mannans, which have various functional groups (amine, imidazole, phosphate, sulfate, sulfhydryl and hydroxyl) that are potential metal-binding sites. Furthermore, some fungal species produce a dark-brown pigment closely associated with chitin, known as melanin that contains many groups including carboxyl, phenolic and alcoholic hydroxyl, carbonyl and methoxyl, which have a vital role in metal adsorption, significantly increasing the efficiency of the biosorption process [ 18 , 24 – 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…We characterize this pigment as 3,4-dihydroxyphenylalanine (DOPA)-melanin according to its physicochemical properties and tests with melanin biosynthesis inhibitors [ 29 ]. In the literature, other studies have also suggested that biomass from fungi pigmented can be considered a promising biosorbent due to the fact that melanin acts as a metal chelator, significantly enhancing the biomass-metal interaction and consequently its biosorption capacity [ 18 , 30 – 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Innovative method for encapsulating highly pigmented biomass from Aspergillus nidulans mutant for copper ions removal and recovery

et al. 2021

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Biosorption has been considered a promising technology for the treatment of industrial effluents containing heavy metals. However, the development of a cost-effective technique for biomass immobilization is essential for successful application of biosorption in industrial processes. In this study, a new method of reversible encapsulation of the highly pigmented biomass from Aspergillus nidulans mutant using semipermeable cellulose membrane was developed and the efficiency of the encapsulated biosorbent in the removal and recovery of copper ions was evaluated. Data analysis showed that the pseudo-second-order model better described copper adsorption by encapsulated biosorbent and a good correlation (r2 > 0.96) to the Langmuir isotherm was obtained. The maximum biosorption capacities for the encapsulated biosorbents were higher (333.5 and 116.1 mg g-1 for EB10 and EB30, respectively) than that for free biomass (92.0 mg g-1). SEM-EDXS and FT-IR analysis revealed that several functional groups on fungal biomass were involved in copper adsorption through ion-exchange mechanism. Sorption/desorption experiments showed that the metal recovery efficiency by encapsulated biosorbent remained constant at approximately 70% during five biosorption/desorption cycles. Therefore, this study demonstrated that the new encapsulation method of the fungal biomass using a semipermeable cellulose membrane is efficient for heavy metal ion removal and recovery from aqueous solutions in multiple adsorption-desorption cycles. In addition, this reversible encapsulation method has great potential for application in the treatment of heavy metal contaminated industrial effluents due to its low cost, the possibility of recovering adsorbed ions and the reuse of biosorbent in consecutive biosorption/desorption cycles with high efficiency of metal removal and recovery.

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“…However, researchers have studied a promising branch of bioremediation that utilises the processes mediated by microorganisms such as fungi and bacteria, exploiting their metabolism to change metal bioavailability, mobilisation, and solubilisation, and to degrade organic pollutants. Two of the main approaches typically employed in marine sediments depend on the specific conditions created to stimulate microbial metabolism: bioaugmentation, which comprises inoculation of microbial strains in the sediments, and biostimulation, which stimulates the metabolic activities of the native microbial communities by the inoculation of specific nutrients [23][24][25].…”

Section: Based On the Principles Of Bioremediationmentioning

confidence: 99%

Port Sediments: Problem or Resource? A Review Concerning the Treatment and Decontamination of Port Sediments by Fungi and Bacteria

et al. 2021

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Contamination of marine sediments by organic and/or inorganic compounds represents one of the most critical problems in marine environments. This issue affects not only biodiversity but also ecosystems, with negative impacts on sea water quality. The scientific community and the European Commission have recently discussed marine environment and ecosystem protection and restoration by sustainable green technologies among the main objectives of their scientific programmes. One of the primary goals of sustainable restoration and remediation of contaminated marine sediments is research regarding new biotechnologies employable in the decontamination of marine sediments, to consider sediments as a resource in many fields such as industry. In this context, microorganisms—in particular, fungi and bacteria—play a central and crucial role as the best tools of sustainable and green remediation processes. This review, carried out in the framework of the Interreg IT-FR Maritime GEREMIA Project, collects and shows the bioremediation and mycoremediation studies carried out on marine sediments contaminated with ecotoxic metals and organic pollutants. This work evidences the potentialities and limiting factors of these biotechnologies and outlines the possible future scenarios of the bioremediation of marine sediments, and also highlights the opportunities of an integrated approach that involves fungi and bacteria together.

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Mycoremediation of heavy metals: processes, mechanisms, and affecting factors

Cited by 88 publications

References 300 publications

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Heavy Metal-Resistant Filamentous Fungi as Potential Mercury Bioremediators

Innovative method for encapsulating highly pigmented biomass from Aspergillus nidulans mutant for copper ions removal and recovery

Port Sediments: Problem or Resource? A Review Concerning the Treatment and Decontamination of Port Sediments by Fungi and Bacteria

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