Cr(VI) reduction by an Aspergillus tubingensis strain: Role of carboxylic acids and implications for natural attenuation and biotreatment of Cr(VI) contamination

Coreño-Alonso, Alejandro; Aguilar, Francisco Javier Acevedo; Reyna-López, Georgina E.; Tomasini, Araceli; Fernandez, F; Wróbel, Katarzyna; Gutiérrez-Corona, J. Félix

doi:10.1016/j.chemosphere.2009.02.031

Cited by 31 publications

(11 citation statements)

References 25 publications

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“…This implies that it would not be possible to continuously remove Cr(VI) on a long-term basis without intermittently reseeding the biological system. However, there are recent reports concerning stable biological Cr(VI) reduction in continuous systems which could contradict this theory [21,31,32].…”

Section: Introductionmentioning

confidence: 85%

“…For example, in Cr(VI) removal experiments using fed-batch reactors [43] or sequential batch reactors (SBR) where a partial replacement of the culture medium is performed [32], results may reflect the accumulation of potentially toxic by-products. In addition, if only the carbon source but not the entire culture medium is respiked [8] then an imbalance of nutrients may occur.…”

Section: Tablementioning

confidence: 99%

See 1 more Smart Citation

Cr(Vi) reduction capacity of activated sludge as affected by nitrogen and carbon sources, microbial acclimation and cell multiplication

Orozco

Contreras

Zaritzky

2010

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 85%

Section: Tablementioning

confidence: 99%

Cr(Vi) reduction capacity of activated sludge as affected by nitrogen and carbon sources, microbial acclimation and cell multiplication

Orozco

Contreras

Zaritzky

2010

Journal of Hazardous Materials

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“…Cr(VI) -resistant organisms are known to produce chromium reductase, which mediates the transfer of electrons from NAD(P)H to Cr(VI), converting it to Cr(III) [25,29,51]. The abilities of Aspergillus and Penicillium species to massively reduce Cr(VI) to Cr(III) have earlier been reported [26,[52][53][54][55].…”

Section: Cr(vi) -Reducing Activity Of Fungal Extractsmentioning

confidence: 99%

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Shugaba¹,

Buba²,

Bg³

et al. 2012

J Pet Environ Biotechnol

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The uptake and reduction of Cr(VI) by Aspergillus niger and A. parasiticus was studied in this journal. After 96 hours of growth, the culture solutions spiked with an initial dichromate concentration of 20 mg/l, were completely decolorized and had residual Cr(VI) concentrations of only 0.74 ± 0.55 and 1.69 ± 0.29 mg/l in A. niger and A. parasiticus cultures representing Cr(VI) removal of 96.3% and 91.6%, respectively. In the A. niger culture, significantly (P < 0.01) lower Cr(VI) concentrations were observed within 72 hours of growth compared to those of A. parasiticus, but in both cultures complete removal was almost achieved by 144 hours of growth. The rate of Cr(VI) removal was 0.21 ± 0.09 mgl -1 hr -1 and 0.20 ± 0.07 mgl -1 hr -1 for A. niger and A. parasiticus, respectively. Cellular concentrations of Cr(VI) in the two fungi increased significantly (P < 0.05 -0.001) with increasing concentrations of the dichromate treatments. Although tannic acid as sole source of carbon and energy gave significantly lower Cr(VI) removal than glucose (P < 0.001) and acetate (P < 0.01), it supported the removal of about 85.0% and 68.8% of the metal ion by A. niger and A. parasiticus, respectively. The active mycelia of both fungi showed significantly (P < 0.001) higher Cr(VI) removal than inactivated mycelia after incubation at 30°C for 72 hours. Incubation of cell -free extracts of both fungi with NADH at 30°C for 2 hours showed Cr(VI) reduction of 68.0% and 55.5% for A. niger and A. parasiticus, respectively. These findings suggest that uptake and metabolic reduction may be the process by which the two fungi are able to tolerate the toxic effects of hexavalent chromium. However, Cr removal via uptake by the two fungal biomass was observed to be in the range of 0.5 -1.78% only, for all the concentrations applied, which is insignificant when compared with the initial Cr concentration in the culture medium. The results obtained through this investigation indicate the possibility of treating waste effluents containing hexavalent chromium using Aspergillus niger and A. parasiticus.

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“…due to its high toxicity [6]. In contrast, Cr(III) is much less toxic and vital to plants and human life [7,8]. Therefore, reduction of Cr(VI) to Cr(III) has attracted wide consideration around the world [9].…”

Section: Introductionmentioning

confidence: 99%

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

et al. 2017

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Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr(VI) over transparent polyvinyl alcohol/titanium dioxide (PVA/TiO2) nanocomposite films under sunlight irradiation. The transparent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high transparency. Photocatalytic reduction of Cr(VI) over PVA/TiO2 nanocomposite films exhibited superior visible light photocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and electrons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclability during multicycle Cr(VI) photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorption ability for Cr(III), and thus totally removal of Cr(VI) was achieved after photoreduction process.

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Cr(VI) reduction by an Aspergillus tubingensis strain: Role of carboxylic acids and implications for natural attenuation and biotreatment of Cr(VI) contamination

Cited by 31 publications

References 25 publications

Cr(Vi) reduction capacity of activated sludge as affected by nitrogen and carbon sources, microbial acclimation and cell multiplication

Cr(Vi) reduction capacity of activated sludge as affected by nitrogen and carbon sources, microbial acclimation and cell multiplication

Uptake and Reduction of Hexavalent Chromium by Aspergillus Niger and Aspergillus Parasiticus

Multicycle photocatalytic reduction of Cr(VI) over transparent PVA/TiO2 nanocomposite films under visible light

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