Removal process and mechanism of hexavalent chromium by adsorption-coupled reduction with marine-derived Aspergillus niger mycelial pellets

Xu, Shanshan; Zhang, Qilei; Bai, Dongmei; Cai, Li-Nian; Lu, Tao; Yao, Shan‐Jing

doi:10.1016/j.cjche.2021.10.002

Cited by 5 publications

(5 citation statements)

References 48 publications

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“…For most of the DSE fungi (PP, TKC, K.III, and DD), with an increase in Cr(VI) concentration, the removal of Cr(VI) increased. This result is in contrast with a previous study that the removal rate of removal Cr(VI) by Aspergillus niger decreased with increasing Cr(VI) concentration [1,23,30]. However, with CPP and KSP, the removal rate increased to 30 mg/L Cr(VI) and decreased to 50 mg/L.…”

Section: Removal Ability Of Cr(vi) By Dse Fungicontrasting

confidence: 96%

“…Using fungi to deteriorate the pollutants in the environment and make it contamination-free is known as mycoremediation. Many strains of fungi have been reported to have the capability to remove Cr(VI) from various wastewater with different mechanisms [14,[17][18][19][20][21][22][23]. However, to our knowledge, no scientific studies have been reported on removing Cr(VI) by dark septate endophytic (DSE) fungi.…”

Section: Introductionmentioning

confidence: 99%

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Chromium (VI) bioremediation potential of dark septate endophytic (DSE) fungi

Melati

Rahayu

Surono³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Manufacturing activities release an extensive quantity of wastes containing hazardous materials like hexavalent chromium [Chromium VI, Cr(VI)] into the surroundings, threatening human health and the ecosystem. Fungi can be utilized as an efficient Cr(VI) remediation implement. The six isolates of dark septate endophytic (DSE) fungi (KSP, CPP, PP, DD, K.III.3.4, TKC) were evaluated for their tolerance and removal ability of various Cr(VI) concentrations (10, 30, and 50 mg/L). The quantification of Cr(VI) removal was analyzed using the 1,5-diphenylcarbazide method by UV-Visible spectrophotometer (Hitachi-U 2900). The results showed that all the DSE isolates were highly tolerant to Cr(VI) concentrations up to 50 mg/L with a tolerance index (TI) of 0.89-1.22. These fungal strains showed no significant growth (p > 0.05) from the controls. Furthermore, all test fungi exhibited an efficient removal capacity of up to 99% of 50 mg/L Cr(VI). The results indicated that DSE fungi are potential agents for bioremediation of Cr(VI) polluted surroundings like manufacturing wastewater. It is the first report on the ability of DSE fungi to remove Cr(VI).

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Section: Removal Ability Of Cr(vi) By Dse Fungicontrasting

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Chromium (VI) bioremediation potential of dark septate endophytic (DSE) fungi

Melati

Rahayu

Surono³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Almost 100% of Cr(VI) were removed after 48 h for solutions with initial Cr(VI) concentrations below 10 mg/L. However, the removal rate decreased as the initial Cr(VI) concentration increased, which aligns with previous studies, suggesting that higher Cr(VI) concentrations inhibit the microbial strain’s Cr(VI) removal capacity due to the toxic effect of Cr(VI) on the organism …”

Section: Resultsmentioning

confidence: 99%

“…However, the removal rate decreased as the initial Cr(VI) concentration increased, which aligns with previous studies, suggesting that higher Cr(VI) concentrations inhibit the microbial strain's Cr(VI) removal capacity due to the toxic effect of Cr(VI) on the organism. 30 In conclusion, these results demonstrate the effectiveness of A. niger mycelial pellets in remediation of wastewater with low concentrations of Cr(VI), and provide a feasible basis for identifying potential functional genes responsible for hexavalent chromium bioremediation in A. niger.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In a study by Gu et al, it was revealed that the removal mechanism of Cr(VI) in living A. niger encompasses reduction followed by biosorption (surface immobilization) and bioaccumulation of Cr(III). Another investigation conducted by Xu et al entailed a preliminary exploration of the process and mechanism of Cr(VI) removal by A. niger mycelial pellets, unveiling the significance of the reduction coupled with adsorption process in facilitating Cr(VI) removal. Recently, a novel mechanism involving the adsorption of Cr(VI) from aqueous solutions by the spores of A. niger , followed by subsequent reduction to Cr(III), has been proposed. − …”

Section: Introductionmentioning

confidence: 99%

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Engineering Aspergillus niger for Effective Bioremoval of Hexavalent Chromium from Water

Xie,

Liu,

Sun

et al. 2024

ACS EST Water

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Aspergillus niger has shown great potential for hexavalent chromium [Cr(VI)] bioremediation in wastewater treatment. However, the specific functional genes involved in the Cr(VI) removal pathway in A. niger remain unexplored, limiting our ability to create genetically engineered A. niger strains with enhanced bioremediation capabilities. In this study, we successfully identified two critical genes in A. niger responsible for chromate removal: chrR, a putative gene encoding chromate reductase, and chrP, a putative gene encoding chromate permease. Our findings revealed that deletion of either chrR or chrP in A. niger significantly impaired Cr(VI) removal. Conversely, overexpressing chrR or chrP increased Cr(VI) removal rates by 34.0% and 29.7%, respectively, compared to the parental strain. Additionally, our study showed that sodA, one of the three cytoplasmic superoxide dismutase genes in A. niger, plays a pivotal role in detoxifying reactive oxygen species (ROS) stress induced by Cr(IV). Furthermore, by cooverexpressing chrR, chrP, and sodA to simultaneously enhance the Cr(VI) uptake, reduction, and ROS detoxification pathway, we successfully engineered an A. niger strain that exhibited a remarkable 92% improvement in Cr(VI) removal compared to the wildtype strain. This achievement highlights the significant potential of genetic engineering in addressing Cr(VI) pollution through bioremediation.

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