Bioreduction of hexavalent chromium by chromium resistant alkalophilic bacteria isolated from tannery effluent

Sarankumar, Raja Kumaresan; Arulprakash, Arumugam; Devanesan, Sandhanasamy; Selvi, A.; AlSalhi, Mohamad S.; Rajasekar, Aruliah; Ahamed, A. Jafar

doi:10.1016/j.jksus.2020.02.010

Cited by 40 publications

(9 citation statements)

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“…A steady increase in the world population and extensive urbanization of the landscape leads to a massive amount of waste disposal and in turn to environmental pollution and human health problems. , Among various heavy metal contaminations, chromium species have received particular attention owing to their rapid migration, environmental accumulation, and acute toxicity . In general, Cr metal exists as Cr(VI) and Cr(III) species, wherein the low-valent oxidation state is a nutrient, while the high-valent species are toxic systems. − When Cr(VI) species enter the bloodstream, they damage blood cells and DNA and, in turn, hemolysis and kidney and liver failure occur. − In the literature, there is sufficient evidence for human carcinogenicity by the Cr(VI) species. ,, The following are some of the sources of chromium species: cement-producing plants, asbestos linings, automotive catalytic converters, tobacco smoke, tannery industries, and so on. − It is noteworthy that the tannery industries are one of the major sources of chromium discharges. It is estimated that 40 million liters of chromium-containing tannery wastewater have been released per year worldwide .…”

Section: Introductionmentioning

confidence: 99%

“…In general, Cr metal exists as Cr(VI) and Cr(III) species, wherein the low-valent oxidation state is a nutrient, while the high-valent species are toxic systems. − When Cr(VI) species enter the bloodstream, they damage blood cells and DNA and, in turn, hemolysis and kidney and liver failure occur. − In the literature, there is sufficient evidence for human carcinogenicity by the Cr(VI) species. ,, The following are some of the sources of chromium species: cement-producing plants, asbestos linings, automotive catalytic converters, tobacco smoke, tannery industries, and so on. − It is noteworthy that the tannery industries are one of the major sources of chromium discharges. It is estimated that 40 million liters of chromium-containing tannery wastewater have been released per year worldwide . Thus, selective removal, conversion of toxic Cr(VI) to nontoxic Cr(III) (detoxification), and sensing are considered to be demanding research interests for the interdisciplinary areas of catalysis, environmental monitoring, and chemical-treatment technologies.…”

Section: Introductionmentioning

confidence: 99%

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High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

Srinivas

Kumar

2022

J. Phys. Chem. C

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Electrochemical reduction of the hexavalent chromium compounds, a serious environmental pollutant and carcinogen, to a nontoxic Cr(III) species is of significant research interest in interdisciplinary areas. Due to its high oxidation potential (1.36 V vs RHE) and associated surface fouling problems with organic-electrocatalyst systems, expensive precious metalbased electrodes like Au, Ag, Pt, and Pd have been widely used for this purpose. Herein we report, an in situ electrochemically prepared highly redox-active Binol species (Binol-Redox)-impregnated carbon nanofiber-modified electrode (CNF@Binol-Redox), E o ′ = 0.50 V versus Ag/AgCl and surface excess value (Γ Binol-Redox ) = 32.5 × 10 −9 mol•cm −2 , as a low-cost, stable, and highperformance molecular electrocatalyst for selective electrochemical reduction of Cr(VI) species in pH 2 HCL/KCl. The new electrode material was characterized using SEM, FTIR, Raman, GC-MS, 1 H NMR (active site isolated as an ethanolic extract), and scanning electrochemical microscopy (SECM) techniques. It has been revealed that an intermediate electrochemical oxygen reduction reaction to H 2 O 2 occurred at CNF@Binol ads , which is a key step for the surface-adsorbed Binol-precursor oxidation to redox-active molecular electrocatalyst. CNF@Binol-Redox showed a high-performance reduction reaction at a reduction potential of 0.5 V versus Ag/AgCl (low overpotential, η = 0.5 V), which is much better than that of several conducting polymers and Pd-based electrocatalysts (high η = 1.5−0.6 V) and closer to the performance of a bulk gold electrode system. Further, this new electrode does not show any dissolved oxygen interference or surface-fouling problem. The Andrieux-Savent electrochemical kinetic model was adopted to calculate the heterogeneous rate constant (k chem ) as 4.29 × 10 5 mol −1 •dm 3 •s −1 . As practical applications, a prototype electrochemical Cr(VI) sensor operatable by one-drop analysis and bulk electrochemical detoxification of Cr(VI) to Cr(III) have been successfully demonstrated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

Srinivas

Kumar

2022

J. Phys. Chem. C

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“…Furthermore, the CPC aerogel was employed to recognize Cr(VI) in simulated leather wastewater (Table S1, Supporting Information). [ 21 ] It was found that the CPC aerogel exhibited a significant fluorescence quenching (Figure S6, Supporting Information), demonstrating great potential for real‐world applications. These results indicate that the prepared CPC aerogel fluorescent sensors are suitable for the determination of Cr(VI) in environmental water samples.…”

Section: Resultsmentioning

confidence: 99%

Exhausted Cr(VI) Sensing/Removal Aerogels Are Recycled for Water Purification and Solar‐Thermal Energy Generation

Shi

et al. 2022

Small

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Heavy metal pollution has resulted in numerous environmental challenges. However, classic approaches, involving the use of solid adsorbents are subject to limitations, including the high energy consumption required for processing before and after use. Accordingly, strategies that facilitate the use of metal capture media that extends beyond waste remediation are attractive. Herein, a porous fluorescent aerogel (CPC aerogel) is constructed by immersing amino‐based carbon dots (CDs‐NH2) into a polyethyleneimine (PEI)/carboxymethylated cellulose (CMC) aerogel network for the simultaneous detection and adsorption of Cr(VI). Adsorption experiments confirm that the CMC/PEI containing CDs‐NH2 aerogel (CPC aerogel) exhibits good Cr(VI) extraction capacity, and can reach a level that conforms with industrial water safety standards. In addition, the CPC aerogel can continuously detect and remove Cr(VI) at high flux. Following Cr(VI) absorption, the CPC aerogel may be vulcanized (MSx‐CPC gel) and used for solar thermoelectric generation resulting in power generation. Additionally, the MSx‐CPC gel can be used for solar steam generation and exhibits excellent evaporation rates of ≈1.31 kg m–2 h–1 under one sun irradiation. The results serve to underscore how materials designed for metal ion recognition and adsorption once exhausted can be exploited to provide materials for solar thermoelectric power generation and seawater desalination.

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“…was isolated from tropical agricultural soils by Minari et al [66], and could effectively remove 60% of the Cr (VI) in the medium. In addition, the Bacillus cereus, Bacillus licheniformis and Bacillus subtilis of Bacillus genus all have good Cr (VI) removal ability in solutions, and the removal rates were 100%, 95% and 93.5% [16,35,67]. In this study, strains AF-1, LB-1, LB-2, LB-3, LB-4 and LB-5 had significantly decreased rhizosphere soil Cr (VI) concentrations from 27.5% to 70.5%, indicating the Cr (VI)-reducing ability of these bacteria.…”

Section: Influence Of Cr-tolerant Bacteria On Soil Total Cr Concentra...mentioning

confidence: 99%

The Difference between Rhizosphere and Endophytic Bacteria on the Safe Cultivation of Lettuce in Cr-Contaminated Farmland

Wen

Liu

Yu³

et al. 2023

Toxics

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Chromium (Cr) is a major pollutant affecting the environment and human health and microbial remediation is considered to be the most promising technology for the restoration of the heavily metal-polluted soil. However, the difference between rhizosphere and endophytic bacteria on the potential of crop safety production in Cr-contaminated farmland is not clearly elucidated. Therefore, eight Cr-tolerant endophytic strains of three species: Serratia (SR-1~2), Lysinebacillus (LB-1~5) and Pseudomonas (PA-1) were isolated from rice and maize. Additionally, one Cr-tolerant strain of Alcaligenes faecalis (AF-1) was isolated from the rhizosphere of maize. A randomized group pot experiment with heavily Cr-contaminated (a total Cr concentration of 1020.18 mg kg−1) paddy clay soil was conducted and the effects of different bacteria on plant growth, absorption and accumulation of Cr in lettuce (Lactuca sativa var. Hort) were compared. The results show that: (i) the addition of SR-2, PA-1 and LB-5 could promote the accumulation of plant fresh weight by 10.3%, 13.5% and 14.2%, respectively; (ii) most of the bacteria could significantly increase the activities of rhizosphere soil catalase and sucrase, among which LB-1 promotes catalase activity by 224.60% and PA-1 increases sucrase activity by 247%; (iii) AF-1, SR-1, LB-1, SR-2, LB-2, LB-3, LB-4 and LB-5 strains could significantly decrease shoot the Cr concentration by 19.2–83.6%. The results reveal that Cr-tolerant bacteria have good potential to reduce shoot Cr concentration at the heavily contaminated soil and endophytic bacteria have the same or even better effects than rhizosphere bacteria; this suggests that bacteria in plants are more ecological friendly than bacteria in soil, thus aiming to safely produce crops in Cr-polluted farmland and alleviate Cr contamination from the food chain.

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Bioreduction of hexavalent chromium by chromium resistant alkalophilic bacteria isolated from tannery effluent

Cited by 40 publications

References 32 publications

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

High-Performance Electrocatalytic Reduction and Sensing of Hazardous Hexavalent Chromium Using a Redox-Active Binol Species-Impregnated Carbon Nanofiber-Modified Electrode

Exhausted Cr(VI) Sensing/Removal Aerogels Are Recycled for Water Purification and Solar‐Thermal Energy Generation

The Difference between Rhizosphere and Endophytic Bacteria on the Safe Cultivation of Lettuce in Cr-Contaminated Farmland

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