Ca2+ and SO42− accelerate the reduction of Cr(VI) by Penicillium oxalicum SL2

Luo, Yang; Ye, Binhui; Ye, Jien; Pang, Jingli; Xu, Qiao; Shi, Jing; Long, Bibo; Shi, Jiyan

doi:10.1016/j.jhazmat.2019.121072

Cited by 30 publications

(7 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In exceptional cases, CuCl 2 as Ni‐Fe hydrogenase inhibitor contributes to enhance Cr(VI) reduction (Bai et al ., 2018). With the exception of Cu(II), Ca(II) and sulphate ion can accelerate the reduction of Cr(VI) by Penicillium oxalicum SL2 (Luo et al ., 2020). In addition, chromium reductase is also a nitroreductase, and there exists a copper‐induced nitroreductase CinD.…”

Section: Resultsmentioning

confidence: 99%

Cu(II) nonspecifically binding chromate reductase NfoR promotes Cr(VI) reduction

Han

Zheng

Zhou

et al. 2020

Environmental Microbiology

View full text Add to dashboard Cite

Summary Cu(II)‐enhanced microbial Cr(VI) reduction is common in the environment, yet its mechanism is unknown. The specific activity of chromate reductase, NfoR, from Staphylococcus aureus sp. LZ‐01 was augmented 1.5‐fold by Cu(II). Isothermal titration calorimetry and spectral data show that Cu(II) binds to NfoR nonspecifically. Further, Cu(II) stimulates the nitrobenzene reduction of NfoR, indicating that Cu(II) promotes electron transfer. The crystal structure of NfoR in complex with CuSO4 (1.46 Å) was determined. The overall structure of NfoR‐Cu(II) complex is a dimer that covalently binds with FMN and Cu(II)‐binding pocket is located at the interface of the NfoR dimer. Structural superposition revealed that NfoR resembles the structure of class II chromate reductase. Site‐directed mutagenesis revealed that Leu46 and Phe123 were involved in NADH binding, whereas Trp70 and Ser45 were the key residues for nitrobenzene binding. Furthermore, His100 and Asp171 were preferential affinity sites for Cu(II) and that Cys163 is an active site for FMN binding. Attenuation reductase activity in C163S can be partially restored to 54% wild type by increasing Cu(II) concentration. Partial restoration indicates dual‐channel electron transfer of NfoR via Cu(II) and FMN. We propose a catalytic mechanism for Cu(II)‐enhanced NfoR activity in which Cu(I) is formed transiently. Together, the current results provide an insight on Cu (II)‐induced enhancement and benefit of Cr(VI) bioremediation.

show abstract

Section: Resultsmentioning

confidence: 99%

Cu(II) nonspecifically binding chromate reductase NfoR promotes Cr(VI) reduction

Han

Zheng

Zhou

et al. 2020

Environmental Microbiology

View full text Add to dashboard Cite

show abstract

“…Another anion, SO 4 −2 also ensured increased Cr(VI) reduction by improving cell growth in some species (Bonilla et al, 2016;He et al, 2019). In a different way, the synthesis of thiol compounds from SO 4 −2 alleviated the oxidative stress of Cr(VI), which accelerated Cr(VI) reduction (Luo et al, 2020). NO 3 − -N as the sole nitrogen source also promoted Cr(VI) reduction by Pseudomonas brassicacearum LZ-4 (Yu et al, 2016).…”

Section: Other Chemical Influencesmentioning

confidence: 99%

“…Addition of Ca(II) in the medium weakened the damage of Cr(VI) and promoted Cr(VI) reduction by Penicillium oxalicum SL2. The main role of this divalent cation was in stimulating the synthesis of calcium oxalate crystals for maintaining the integrity of cell wall (Luo et al, 2020). Amendment of Na(I) contributed to an increase in the activity of Cr(VI) reduction by the yeast, Pichia jadinii M9, where the role of monovalent cation in the bioprocess remained unidentified (Martorell et al, 2012).…”

Section: Other Chemical Influencesmentioning

confidence: 99%

Chemical-Assisted Microbially Mediated Chromium (Cr) (VI) Reduction Under the Influence of Various Electron Donors, Redox Mediators, and Other Additives: An Outlook on Enhanced Cr(VI) Removal

Rahman

Thomas

2021

Front. Microbiol.

View full text Add to dashboard Cite

Chromium (Cr) (VI) is a well-known toxin to all types of biological organisms. Over the past few decades, many investigators have employed numerous bioprocesses to neutralize the toxic effects of Cr(VI). One of the main process for its treatment is bioreduction into Cr(III). Key to this process is the ability of microbial enzymes, which facilitate the transfer of electrons into the high valence state of the metal that acts as an electron acceptor. Many underlying previous efforts have stressed on the use of different external organic and inorganic substances as electron donors to promote Cr(VI) reduction process by different microorganisms. The use of various redox mediators enabled electron transport facility for extracellular Cr(VI) reduction and accelerated the reaction. Also, many chemicals have employed diverse roles to improve the Cr(VI) reduction process in different microorganisms. The application of aforementioned materials at the contaminated systems has offered a variety of influence on Cr(VI) bioremediation by altering microbial community structures and functions and redox environment. The collective insights suggest that the knowledge of appropriate implementation of suitable nutrients can strongly inspire the Cr(VI) reduction rate and efficiency. However, a comprehensive information on such substances and their roles and biochemical pathways in different microorganisms remains elusive. In this regard, our review sheds light on the contributions of various chemicals as electron donors, redox mediators, cofactors, etc., on microbial Cr(VI) reduction for enhanced treatment practices.

show abstract

“…) is known to be carcinogenic, mutagenic, and teratogenic, and much more mobile in the environment [5,6]. In order to minimize the harm of Cr(VI), reduction of Cr(VI) to Cr(Ⅲ ) is one of the most common methods [7,8].…”

Section: -mentioning

confidence: 99%

Removal of Hexavalent Chromium From Wastewater by Cu/Fe Bimetallic Nanoparticles

Wang

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

BackgroundNanoscale zerovalent iron (nZVI) is a promising material for removing heavy metals from wastewater. However, passivation of nZVI hinders its efficiency in water treatment. Loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Purpose of this study was to clarify the effects and mechanisms of Cu loading on the removal efficiency of Cr(VI).ResultsThe results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. It was found that Cr(VI) removal followed a pseudo-first-order kinetic model. When the Cu loading rate was 3%, the initial concentration of Cr(VI) was 100 mg/L, the observed first-order rate coefficient (kobs) was 0.016 min-1 for Cu/Fe bimetallic nanoparticles at pH of 3.5, which was twice than that of nZVI (0.008 min-1). X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(Ⅲ) and precipitated on the particle surface as hydroxylated Cr(OH)3 and CrxFe1-x(OH)3 coprecipitation.ConclusionsIn this study, it was found that the loading of Cu can significantly increase the specific surface area and the Cr(VI) remove efficiency of nZVI, and the removal efficiency decreases with increasing pH and Cr(VI) initial concentration. Therefore, Cu loading can alleviate the passivation of nZVI effectively and can be beneficial for the application of iron-based nanomaterials in remediation of wastewater.

show abstract

Ca2+ and SO42− accelerate the reduction of Cr(VI) by Penicillium oxalicum SL2

Cited by 30 publications

References 51 publications

Cu(II) nonspecifically binding chromate reductase NfoR promotes Cr(VI) reduction

Cu(II) nonspecifically binding chromate reductase NfoR promotes Cr(VI) reduction

Chemical-Assisted Microbially Mediated Chromium (Cr) (VI) Reduction Under the Influence of Various Electron Donors, Redox Mediators, and Other Additives: An Outlook on Enhanced Cr(VI) Removal

Removal of Hexavalent Chromium From Wastewater by Cu/Fe Bimetallic Nanoparticles

Contact Info

Product

Resources

About