Detoxification of azo dye Direct Black G by thermophilic Anoxybacillus sp. PDR2 and its application potential in bioremediation

Chen, Guotao; An, Xiaopeng; Li, Hanguang; Lai, Fenju; Yuan, Erdong; Xia, Xiang; Zhang, Qinghua

doi:10.1016/j.ecoenv.2021.112084

Cited by 50 publications

(16 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, how to get rid of azo dye pollution from wastewater has been attracting significant attention. So far, numerous technical and engineering approaches have been engaged to treat azo dye wastewater, such as the adsorption method using activated carbon [ 9 ], membrane separation technology [ 10 ], magnetic separation technology [ 11 ], the chemical oxidation method [ 12 ] and the biological method [ 13 ]. Among these techniques, adsorption using a suitable adsorbent is an alternative procedure and exhibits the best results [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Ding

2022

Materials

View full text Add to dashboard Cite

Hydrogen peroxide (H2O2), an accessible and eco-friendly oxidant, was employed for the template-free hydrothermal synthesis of mesoporous CeO2 based on a cerium carbonate precursor (Ce2(CO3)3•xH2O). Its microstructure and physicochemical properties were characterized by XRD, TEM and N2 sorption techniques. The formation of the CeO2 phase with a porous structure was strongly dependent on the presence of H2O2, while the values of the BET surface area, pore diameter and pore volume of CeO2 were generally related to the amount of H2O2 in the template-free hydrothermal synthesis. The BET surface area and pore volume of the mesoporous CeO2 synthesized hydrothermally at 180 °C with 10 mL H2O2 were 112.8 m2/g and 0.1436 cm3/g, respectively. The adsorption process had basically finished within 30 min, and the maximum adsorption efficiency within 30 min was 99.8% for the mesoporous CeO2 synthesized hydrothermally at 140 °C with 10 mL, when the initial AO7 concentration was 120 mg/L without pH preadjustment. The experimental data of AO7 adsorption were analyzed using the Langmuir and Freundlich isotherm modes. Moreover, the mesoporous CeO2 synthesized at 140 °C with 10 mL H2O2 was regenerated in successive adsorption–desorption cycles eight times without significant loss in adsorption capacity, suggesting that the as-synthesized mesoporous CeO2 in this work was suitable as an adsorbent for the efficient adsorption of AO7 dye from an aqueous solution.

show abstract

Section: Introductionmentioning

confidence: 99%

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Ding

2022

Materials

View full text Add to dashboard Cite

show abstract

“…Many thermophilic microbial species convert toxic azo dyes and/or their intermediates into low toxicity metabolites at elevated temperatures. This indicates that thermophiles have metabolic pathways for the degradation and detoxification of textile dyes ( Chen G. et al, 2021 ).…”

Section: Dye Types Used By the Textile Industry Their Environmental I...mentioning

confidence: 99%

“…Similarly, another thermophilic bacterial strain, Anoxybacillus sp. PDR2, was shown to effectively degrade Direct Black G (DBG), a dye known to be highly toxic to most organisms ( Chen G. et al, 2021 ).…”

Section: Dye Types Used By the Textile Industry Their Environmental I...mentioning

confidence: 99%

“…The microbial oxidative stress enzymes (SOD and CAT) both play a role in protecting the cell from OS generated during the degradation of dye, Reactive Orange 16 (RO16) ( Bedekar et al, 2014 ). These enzymes were shown to be thermostable and are to degrade the dye at elevated temperatures ( Chen G. et al, 2021 ). Other enzymes involved in dye degradation are azoreductases which are responsible for the reductive cleavage of the azo bonds ( Lellis et al, 2019 ; Krithika et al, 2021 ), tyrosinase, lignin peroxidase, NADH-DCIP reductase, riboflavin reductase, and laccases ( Dawkar et al, 2010 ; Saratale et al, 2011 ).…”

Section: Oxidative Stress In Thermophilesmentioning

confidence: 99%

“…When challenged with oxidative stress microorganisms protect themselves by producing different enzymes, such as superoxide dismutase and catalase ( Bedekar et al, 2014 ), NADH: quinone oxidoreductase ( Gianolini et al, 2020 ), glyoxal oxidase (MtGLOx), and other extracellular oxidoreductases ( Yan et al, 2021 ). Therefore, understanding the adaptive response mechanisms of microorganisms to oxidative stress could play an important role in the design of treatment processes ( Chen G. et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adaptive Response of Thermophiles to Redox Stress and Their Role in the Process of dye Degradation From Textile Industry Wastewater

2022

View full text Add to dashboard Cite

Release of dye-containing textile wastewater into the environment causes severe pollution with serious consequences on aquatic life. Bioremediation of dyes using thermophilic microorganisms has recently attracted attention over conventional treatment techniques. Thermophiles have the natural ability to survive under extreme environmental conditions, including high dye concentration, because they possess stress response adaptation and regulation mechanisms. Therefore, dye detoxification by thermophiles could offer enormous opportunities for bioremediation at elevated temperatures. In addition, the processes of degradation generate reactive oxygen species (ROS) and subject cells to oxidative stress. However, thermophiles exhibit better adaptation to resist the effects of oxidative stress. Some of the major adaptation mechanisms of thermophiles include macromolecule repair system; enzymes such as superoxide dismutase, catalase, and glutathione peroxidase; and non-enzymatic antioxidants like extracellular polymeric substance (EPSs), polyhydroxyalkanoates (PHAs), etc. In addition, different bacteria also possess enzymes that are directly involved in dye degradation such as azoreductase, laccase, and peroxidase. Therefore, through these processes, dyes are first degraded into smaller intermediate products finally releasing products that are non-toxic or of low toxicity. In this review, we discuss the sources of oxidative stress in thermophiles, the adaptive response of thermophiles to redox stress and their roles in dye removal, and the regulation and crosstalk between responses to oxidative stress.

show abstract

Accelerating biodegradation of an azo dye by using its inorganic intermediates

Zhang

Peng

Xuan

et al. 2021

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: The discharge of textile wastewater can cause various environment problems. How to remove these dyes in effluents effectively remains a major concern in wastewater treatment. In this work, the accelerating biodegradation effect of two inorganic intermediates generated by UV irradiation on a monoazo dye, Acid Orange 7 (AO7), was studied in a biofilm reactor. RESULTS:The biodegradation reaction fitted well with fractional-order kinetics. The promotion effects of k trend for the two inorganic intermediates were NH 4 + addition > SO 4 2− addition (> AO7 biodegradation alone). NH 4 + ions increased biochemical oxygen demand (BOD) gradually: compared with 0.5 mg L −1 addition protocol, the BOD of 3 mg L −1 addition protocol was enhanced about five-fold. SO 4 2− ions showed a positive effect at low concentration and a negative effect at high concentration. In addition, the effect of the two inorganic intermediates on aerobic microbial respiration rate (i.e. SOUR) was similar to BOD. Based on the analysis of high-throughput sequencing and cluster of orthologous groups, a mechanism of accelerating azo dye biodegradation by using its available intermediates was proposed.CONCLUSION: This work revealed that the main inorganic intermediates of the azo dye could accelerate its biodegradation rates. In addition, the bioreactor provided an integrated anaerobic/aerobic micro-environment that was beneficial to promoting this acceleration effect.

show abstract

Detoxification of azo dye Direct Black G by thermophilic Anoxybacillus sp. PDR2 and its application potential in bioremediation

Cited by 50 publications

References 46 publications

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Oxidation-Induced and Hydrothermal-Assisted Template-Free Synthesis of Mesoporous CeO2 for Adsorption of Acid Orange 7

Adaptive Response of Thermophiles to Redox Stress and Their Role in the Process of dye Degradation From Textile Industry Wastewater

Accelerating biodegradation of an azo dye by using its inorganic intermediates

Contact Info

Product

Resources

About