Improvement of simultaneous Cr(VI) and phenol removal by an immobilised bacterial consortium and characterisation of biodegradation products

Ontañon, Ornella Mailén; González, Pablo J.; Barros, Germán; Agostini, Elizabeth

doi:10.1016/j.nbt.2017.02.003

Cited by 36 publications

(17 citation statements)

References 38 publications

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“…According to Tao et al [52], the use of free microorganisms for bioremediation of contaminated sites can fail because the inoculants must be able to overcome biotic and abiotic stresses in the environment that they were introduced. The advantages of immobilized microorganisms rather than free bacteria include better adaptation, greater control of bioprocesses, lower susceptibility to contamination by undesirable microorganisms, greater resistance to extreme environmental conditions, possibility of reutilization and improved degradation efficiency [10,13]. In addition, immobilized microorganisms can be used in bioreactors, increasing these biocatalysts applications.…”

Section: Reuse Of Chitosan Beads With Immobilized Bacteriamentioning

confidence: 99%

“…Compared to the conventional physical-chemical treatments, the use of microorganisms has been highly efficient, stable, economic, and eco-friendly [8,9]. However, finding strains capable of degrading PAHs is quite difficult, since high concentrations of these compounds and environmental conditions can affect the microbial growth and survival [10]. Therefore, to overcome this problem and improve the bioremediation efficiency, the use of microorganisms immobilized in supports showed several advantages over the use of free cells [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Fluoranthene Biodegradation by Serratia sp. AC-11 Immobilized into Chitosan Beads

Garcia

Araújo

Birolli

et al. 2019

Appl Biochem Biotechnol

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The intensive production of polycyclic aromatic hydrocarbons by anthropogenic activities is a serious environmental problem. Therefore, new bioremediation methods are required to avoid widespread contamination. In this work, Serratia sp. AC-11 strain isolated from a tropical peat was selected for immobilization into chitosan beads, which were employed in the biodegradation of fluoranthene. The sizes of the produced beads were relatively uniform with an average diameter of 3 mm. The material was characterized by SEM and FT-IR, confirming the cells immobilization and the protective barrier formed by the chitosan surrounding the biomass. The immobilized bacteria were able to degrade 56% of fluoranthene (the initial concentration was 100 mg L −1) in just 1 day at twice the degradation rate achieved by freeliving cells. Furthermore, the immobilized bacteria showed excellent removal during five reuse cycles, from 76% to 59% of biodegradation. These results showed the potential of this approach for remediation of contaminated sites.

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Section: Reuse Of Chitosan Beads With Immobilized Bacteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluoranthene Biodegradation by Serratia sp. AC-11 Immobilized into Chitosan Beads

Garcia

Araújo

Birolli

et al. 2019

Appl Biochem Biotechnol

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“…[1][2][3] This compound is discharged into the ecosystem by effluent from a wide range of industries: tanning, painting production, pharmaceuticals, and processing of petroleum. [4][5][6][7] The phenol is difficult to degrade by conventional procedures. Specifically, the biological treatment is typically ineffective due to the self-inhibiting effect on the bacteria when phenol derivative compounds are involved.…”

Section: Introductionmentioning

confidence: 99%

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Zakaria

Hassan

Ibrahim

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Heterogeneous photocatalysis has been demonstrated to be a promising alternative to treating emerging pollutants in wastewater. Phenol, an extremely toxic substance among existing pollutants, can cause long‐term unintended effects when improperly disposed. An effective measure to address this problem is to develop suitable heterojunctions. Among various photocatalyst, titanium dioxide (TiO2) appears to be an excellent photocatalyst in the degradation of organic pollutants. RESULTS Synthetization of well‐constructed heterojunction composite of niobium oxide (Nb2O5) and fibrous silica titania (FST) for enhanced photocatalytic degradation of phenol has been investigated. The photocatalytic performance demonstrated that 5 wt% Nb2O5 loaded on FST (5 Nb/FST) gave the maximum phenol degradation rate (1.70 × 10−2 mM min−1) of 10 mg L−1 phenol at pH 5 using 1000 mg L−1 catalyst within 180 min. Meanwhile, under the same conditions, 1 Nb/FST, FST, 10 Nb/FST and Nb2O5 only delivered 1.51 × 10−2, 1.30 × 10−2, 1.01 × 10−2 and 0.07 × 10−2 mM min−1, respectively. Further phenol photocatalytic degradation routes by 5 Nb/FST reveal that the main intermediates detected are hydroquinone, catechol, maleic, fumaric, and malonic acid. CONCLUSION In this work, 5 Nb2O5/FST composite, as an effective‐performance photocatalyst for phenol degradation, was well‐constructed. The advanced activity can primarily be attributed to the regulated Nb2O5 loading with FST and the effect of Nb/FST microsphere heterojunctions, synergistically. Besides, larger crystallite size, high impurity levels and Si‐O‐Nb and Nb–O–Ti bonds, offers excellent phenol degradation. © 2020 Society of Chemical Industry (SCI)

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“…In recent years, various techniques of removing contaminants in wastewater have been investigated, including adsorption [ 7 , 8 ], biodegradation [ 9 , 10 ], photocatalysis [ 11 , 12 ], and biocatalytic oxidation [ 13 , 14 ]. Among them, adsorption has been the most widely used and effective approach in wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Reusable Montmorillonite/Fe3O4/Humic Acid Nanocomposites for Simultaneous Removal of Cr(VI) and Aniline

Wang

et al. 2018

Nanomaterials

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Recyclable nanomaterials are in great need to develop clean technology for applications in the removal of water contaminants. In this work, easily separable montmorillonite/Fe3O4/humic acid (MFH) nanocomposites were fabricated through a facile hydrothermal route. It was found the adsorption ability and stability of MFH was significantly enhanced due to the synergistic effects between montmorillonite, Fe3O4 nanoparticles and humic acid. The MFH nanocomposites are highly efficient and recyclable as they can remove at least 82.3% of Cr(VI) and 95.1% of aniline in six consecutive runs. The adsorption mechanism was investigated by analyzing the kinetic parameters of pseudo first-order, pseudo second-order, and intraparticle diffusion models and describing the equilibrium isotherms of Langmuir and Freundlich models. Results indicated different adsorption mechanisms of Cr(VI) and aniline by MFH. The readily synthesized MFH nanocomposites can act as effective and practical materials for environmental applications.

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Improvement of simultaneous Cr(VI) and phenol removal by an immobilised bacterial consortium and characterisation of biodegradation products

Cited by 36 publications

References 38 publications

Fluoranthene Biodegradation by Serratia sp. AC-11 Immobilized into Chitosan Beads

Fluoranthene Biodegradation by Serratia sp. AC-11 Immobilized into Chitosan Beads

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

Highly Efficient and Reusable Montmorillonite/Fe3O4/Humic Acid Nanocomposites for Simultaneous Removal of Cr(VI) and Aniline

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