Treatment of textile wastewater containing mixed toxic azo dye and chromium (VI) BY haloalkaliphilic bacterial consortium

Biju, Leena Merlin; Pooshana, V.; Kumar, P. Senthil; Krishnaswamy, Veena Gayathri; Ansar, Sabah; Govindaraju, Saravanan

doi:10.1016/j.chemosphere.2021.132280

Cited by 29 publications

(14 citation statements)

References 53 publications

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“…In particular, diazo dyes are more toxic because of their difficult degradation and possible secondary pollution after the first treatment [3]. Congo red (CR), which is a diazo dye, possesses an intricate aromatic structure [4] and is a potent mutagen that results in diseases of the blood, nerves, respiratory system, intestines, stomach, and reproductive system [5]. Therefore, it is crucial to treat CR wastewater before it is discharged into the environment.…”

Section: Introductionmentioning

confidence: 99%

Combustion process for magnetic copper–cobalt ferrite and its Congo red adsorption property

Liu

Ouyang

Wang

2022

Mater. Res. Express

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A rapid combustion process was introduced for the preparation of magnetic copper–cobalt ferrite, which was characterized using X-ray diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Brunauer–Emmett–Teller techniques (BET). The prepared magnetic copper–cobalt ferrite showed a large specific surface area (104.6 cm2/g) and nanoscale particle size (55.4 nm), with a saturation magnetization of 19.6 Am2/kg. The nanoparticles were used to adsorb and remove Congo red (CR) from dyestuff wastewater, and the adsorption mechanism was revealed. Compared with the pseudo-first-order kinetic model and intraparticle diffusion kinetic model, the pseudo-second-order kinetic model was better at describing the CR adsorption process on the Cu0.5Co0.5Fe2O4 nanoparticles, while the Temkin isotherm best fitted the CR adherence on the Cu0.5Co0.5Fe2O4 nanoparticles. All data suggested that the adsorption of CR on the Cu0.5Co0.5Fe2O4 nanoparticles followed the mono-multilayer hybrid chemisorption mechanism. In addition, as the pH increased from 2 to 10, the adsorption capacity of the Cu0.5Co0.5Fe2O4 nanoparticles for CR decreased, indicating that an acidic environment was beneficial for the adsorption of CR on the Cu0.5Co0.5Fe2O4 nanoparticles. When recycling the Cu0.5Co0.5Fe2O4 nanoparticles after adsorbing CR, the relative adsorption rate was still 62.5% of the initial adsorption capacity after five cycles, revealing the reusability and promising applicability of Cu0.5Co0.5Fe2O4 nanoparticles in sewage treatment.

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Section: Introductionmentioning

confidence: 99%

Combustion process for magnetic copper–cobalt ferrite and its Congo red adsorption property

Liu

Ouyang

Wang

2022

Mater. Res. Express

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“…Azo dyes as the largest class of synthetic dyes are widely used in the textile and dyeing industries. To stabilize azo dyes, heavy metals such as chromium and cobalt are used 1 . Thus, azo dyes and Cr(VI) coexist in the wastewaters of the industries mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Accordingly, the bioremoval of azo dyes and Cr(VI) has received much attention. [1][2][3] However, under anaerobic conditions, their anaerobic bioreduction rates are very slow.…”

Section: Introductionmentioning

confidence: 99%

“…To stabilize azo dyes, heavy metals such as chromium and cobalt are used. 1 Thus, azo dyes and Cr(VI) coexist in the wastewaters of the industries mentioned above. Many studies show that these pollutants are mutagenic, teratogenic and carcinogenic to aquatic creatures, and even to humans.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies show that these pollutants are mutagenic, teratogenic and carcinogenic to aquatic creatures, and even to humans 2,3 . Accordingly, the bioremoval of azo dyes and Cr(VI) has received much attention 1‐3 . However, under anaerobic conditions, their anaerobic bioreduction rates are very slow.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic molecularly imprinted polymers for selectively adsorbing flavins and their effects on bioremoval of Acid Red 18 and Cr(VI)

Liu

Lü

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Flavins can be used as redox mediators to accelerate anaerobic biotransformation of refractory pollutants. For better application of flavins, suitable immobilization methods need to be developed. As most microorganisms can synthesize flavins, it is a good strategy to develop selective solid sorbents for immobilizing the flavins released by waste biomass including waste activated sludge (WAS). RESULTS Novel core–shell magnetic molecularly imprinted polymers (MMIPs) for flavins were successfully prepared. The adsorption amount of 10 mg of MMIPs for flavin mononucleotide (FMN) could reach 29.19 μmol g−1, which was around 24.9‐fold higher than that of magnetic non‐molecularly imprinted polymers (1.17 μmol g−1). Their isothermal adsorption process followed the Langmuir model. Similar adsorption behaviors of MMIPs were also observed for flavin adenine dinucleotide (FAD) and riboflavin. The three flavins adsorbed on MMIPs enhanced the removal rates of azo dye Acid Red 18 (AR 18) and Cr(VI) by Shewanella oneidensis MR‐1. Moreover, the catalytic performance of MMIPs–FMN could remain at 97.6% of the original value after five repeated usages. Further studies found that MMIPs could efficiently adsorb FAD from the lysate of WAS, and MMIPs–FAD enhanced the decolorization of AR 18. CONCLUSIONS The novel MMIPs could selectively adsorb flavins. MMIPs–flavins exhibited good catalytic and repeated usage performances, indicating that they could be used for accelerating anaerobic biotransformation of refractory pollutants. © 2022 Society of Chemical Industry (SCI).

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Facile Synthesis of Hybrid Nanoflowers Using Glycine and Phenylalanine and Investigation of Their Catalytic Activity

Demırbas

Karsli

Öçsoy

2023

Chemistry & Biodiversity

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In the context of the proposed work, two different amino acids (Glycine, Phenylalanine) have interacted with copper ions in a phosphate buffer (PBS) in place of enzymes. This interaction resulted in the nucleation of copper phosphate crystals and the formation of flower‐shaped amino acid‐copper hybrid nanostructures (AA‐hNFs), which grew through self‐assembly. While Cu (II) ions in the structure of AA‐hNFs were used as Fenton's agent for the catalytic activity. SEM, energy dispersive X‐ray spectroscopy, X‐ray diffraction, and Fourier transform infrared spectroscopy measurements were used to define the AA‐hNFs′ characterisation. The peroxidase‐like activities of AA‐hNFs were investigated by UV/VIS spectrophotometer. Metal nanoparticles have peroxidase‐like activity. A class of enzymes known as peroxidases is able to catalyze the conversion of hydrogen peroxide into hydroxyl radicals. These radicals also take part in electron transfers with substrates, which results in color during oxidation. When cupric oxide nanoparticles are added to the peroxidase substrate while H2O2 is present, a blue color product with a maximum absorbance at=652 nm can result, demonstrating the catalytic activity of a peroxidase. The morphology and composition of AA‐hNFs were carefully characterized and the synthesized parameters were optimized systematically. Results showed that the nanoparticles were dispersed with an average diameter of 7–9 μm and indicated a uniform flower shape. The results of the investigation are anticipated to significantly advance a number of technical and scientific sectors.

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Treatment of textile wastewater containing mixed toxic azo dye and chromium (VI) BY haloalkaliphilic bacterial consortium

Cited by 29 publications

References 53 publications

Combustion process for magnetic copper–cobalt ferrite and its Congo red adsorption property

Combustion process for magnetic copper–cobalt ferrite and its Congo red adsorption property

Magnetic molecularly imprinted polymers for selectively adsorbing flavins and their effects on bioremoval of Acid Red 18 and Cr(VI)

Facile Synthesis of Hybrid Nanoflowers Using Glycine and Phenylalanine and Investigation of Their Catalytic Activity

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