scholarly journals Franconibacter sp., 1MS: A New Strain in Decolorization and Degradation of Azo Dyes Ponceau S Red and Methyl Orange

ACS Omega ◽  
2020 ◽  
Vol 5 (43) ◽  
pp. 28146-28157
Author(s):  
Dayana Baena-Baldiris ◽  
Alfredo Montes-Robledo ◽  
Rosa Baldiris-Avila
Keyword(s):  
Methyl Orange ◽  
Azo Dyes ◽  
Ponceau S

Electrospun 3,5-dithienylvinyleneBODIPY embedded polystyrene nanofibers for the photocatalytic degradation of azo dyes in industrial wastewaters

2018 ◽  
Vol 22 (06) ◽  
pp. 501-508 ◽  
Author(s):  
Augustus K. Lebechi ◽  
Lizhi Gai ◽  
Zhen Shen ◽  
Tebello Nyokong ◽  
John Mack
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Azo Dyes ◽  
Solid Phase ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
First Order Kinetics ◽  
Orange G ◽  
Methyl Orange Concentration ◽  
Degradation Properties

The potential utility of electrospun polystyrene (PS) nanofibers embedded with 2,6-diiodo-8-phenyl-1,7-dimethyl-3,5-di-2-thienylvinyleneBODIPY for the photocatalytic degradation of azo dyes is investigated. A comparison of the singlet oxygen quantum yield of the [Formula: see text]-extended BODIPY dye in solution and in the PS nanofibers demonstrates that its photosensitizer properties are retained when it is embedded in the solid phase. The photocatalytic degradation properties of the PS nanofibers for Methyl Orange and Orange G were determined by using a Thorlabs 625 nm light emitting diode. The rate of photodegradation increases with the Orange G and Methyl Orange concentration and follows pseudo-first order kinetics at pH 6.7.

scholarly journals Biochemical and molecular characterization of an azoreductase from Staphylococcus aureus, a tetrameric NADPH-dependent flavoprotein

Microbiology ◽  
2005 ◽  
Vol 151 (5) ◽  
pp. 1433-1441 ◽  
Author(s):  
Huizhong Chen ◽  
Sherryll L. Hopper ◽  
Carl E. Cerniglia
Keyword(s):  
Staphylococcus Aureus ◽  
Azo Dyes ◽  
Mrna Level ◽  
Hydrophobic Interaction Chromatography ◽  
Consumer Products ◽  
Methyl Red ◽  
Gene Encoding ◽  
Native Molecular Mass ◽  
Ponceau S ◽  
Prosthetic Groups

Azo dyes are a predominant class of colourants used in tattooing, cosmetics, foods and consumer products. A gene encoding NADPH-flavin azoreductase (Azo1) from the skin bacterium Staphylococcus aureus ATCC 25923 was identified and overexpressed in Escherichia coli. RT-PCR results demonstrated that the azo1 gene was constitutively expressed at the mRNA level in S. aureus. Azo1 was found to be a tetramer with a native molecular mass of 85 kDa containing four non-covalently bound FMN. Azo1 requires NADPH, but not NADH, as an electron donor for its activity. The enzyme was resolved to dimeric apoprotein by removing the flavin prosthetic groups using hydrophobic-interaction chromatography. The dimeric apoprotein was reconstituted on-column and in free stage with FMN, resulting in the formation of a fully functional native-like tetrameric enzyme. The enzyme cleaved the model azo dye 2-[4-(dimethylamino)phenylazo]benzoic acid (Methyl Red) into N,N-dimethyl-p-phenylenediamine and 2-aminobenzoic acid. The apparent K m values for NADPH and Methyl Red substrates were 0·074 and 0·057 mM, respectively. The apparent V max was 0·4 μM min−1 (mg protein)−1. Azo1 was also able to metabolize Orange II, Amaranth, Ponceau BS and Ponceau S azo dyes. Azo1 represents the first azoreductase to be identified and characterized from human skin microflora.

Simultaneous Electricity Generation and Electrochemical Decolorization of Azo Dyes in Microbial Fuel Cells

2013 ◽  
Vol 291-294 ◽  
pp. 602-605 ◽  
Author(s):  
Liang Liu ◽  
Wen Yi Zhang
Keyword(s):  
Fuel Cell ◽  
Methyl Orange ◽  
Microbial Fuel Cell ◽  
Azo Dyes ◽  
Microbial Fuel Cells ◽  
Azo Dye ◽  
Electricity Generation ◽  
Sulfanilic Acid ◽  
Maximum Power Density ◽  
K Value

In this study we investigated the use of a microbial fuel cell (MFC) to abioticlly cathodic decolorization of a model azo dye, Methyl Orange (MO). Experimental results showed that electricity could be continuously generated the MO-fed MFC and MO was successfully decolorized in the cathode. The decolorization rate was highly dependent on the catholyte pH. When pH was varied from 3.0 to 9.0, the k value in relation to MO degradation decreased from 0.298 to 0.016 μmol min-1, and the maximum power density decreased from 34.77 to 1.51 mW m-2. Sulfanilic acid and N,N-dimethyl-p-phenylenediamine were identified as the decolorization products of MO by HPLC-MS.

Oxidative Decolorization of Azo Dyes with Copper Phthalocyanine Supported Mg-Al Hydrotalcites

2016 ◽  
Vol 703 ◽  
pp. 306-310
Author(s):  
Min Hong Xu ◽  
Jian Li Ma ◽  
Meng Xia Qian ◽  
Hui Na Qin
Keyword(s):  
Molecular Structure ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Azo Dyes ◽  
Acidic Solution ◽  
Copper Phthalocyanine ◽  
Ph Value ◽  
Influence Factors ◽  
Amido Black ◽  
Initial Ph

Oxidative decolorization of azo dyes with a heterogeneous catalyst copper phthalocyanine supported Mg-Al hydrotalcites was studied and the influence factors such as initial pH value, temperature, H2O2 and CuPc-LDHs/H2O2 system were discussed. The results indicated that acidic solution and high temperature were conducive to oxidative decoloration of methyl orange. CuPc-LDHs/H2O2 system showed excellent oxidative decoloration capacity to remove azo dyes. The effects of oxidative decolorization of azo dyes were related to the molecular structure and weight of azo dyes. Oxidative decoloration effects followed the order as congo red > amido black > methyl blue> methyl orange> methylene blue.

Microbial conversion of selected azo dyes and their breakdown products

2006 ◽  
Vol 53 (11) ◽  
pp. 163-171 ◽  
Author(s):  
N. Yemashova ◽  
S. Kalyuzhnyi
Keyword(s):  
Methyl Orange ◽  
Activated Sludge ◽  
Azo Dyes ◽  
Anthranilic Acid ◽  
Methyl Red ◽  
Acid Orange 7 ◽  
Microbial Conversion ◽  
Aerobic Conditions ◽  
Acid Orange ◽  
Sulphanilic Acid

Four selected azo dyes (acid orange 6, acid orange 7, methyl orange and methyl red) were completely decolourised in the presence of anaerobic granular sludge, while only methyl red was degraded in aerobic conditions using a conventional activated sludge. Additional experiments with culture broth devoid of cells showed that anaerobic decolourisation of azo dyes was performed by extracellular reducing agents produced by anaerobic bacteria. This was further confirmed by abiotic experiments with sulphide and NADH. The presence of redox mediators such as riboflavin led to dramatic acceleration of the anaerobic biodecolourisation process. The azo dye reduction products were found to be sulphanilic acid and 4-aminoresorcinol for acid orange 6; sulphanilic acid and 1-amino-2-naphthol for acid orange 7; N,N-dimethyl-1,4-phenylenediamine and sulphanilic acid for methyl orange; and N,N-dimethyl-1,4-phenylenediamine and anthranilic acid for methyl red. Anaerobic toxicity assays showed that the azo dyes were more toxic than their breakdown products (aromatic amines), except 1-amino-2-naphthol. In the presence of activated sludge, only anthranilic acid was completely mineralised while sulphanilic acid was persistent. 4-aminoresorcinol, 1-amino-2-naphthol and N,N-dimethyl-1,4-phenylenediamine underwent autooxidation in aerobic conditions yielding coloured polymeric products. On the contrary, in the presence of granular methanogenic sludge, 4-aminoresorcinol, 1-amino-2-naphthol and anthranilic acid were quantitatively methanised, sulphanilic acid was partially (70%) mineralised while N,N-dimethyl-1,4-phenylenediamine was only demethylated producing 1,4-phenylenediamine as an end product.

Hydrothermal growth of ZnO nanorods on Zn substrates and their application in degradation of azo dyes under ambient conditions

CrystEngComm ◽  
2014 ◽  
Vol 16 (33) ◽  
pp. 7761-7770 ◽  
Author(s):  
Xiaoyan Cai ◽  
Bingqian Han ◽  
Shaojuan Deng ◽  
Yan Wang ◽  
Chengjun Dong ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Azo Dyes ◽  
Zno Nanorods ◽  
Light Illumination ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Ambient Conditions ◽  
Crystal Surfaces ◽  
Additional Energy

ZnO nanorod arrays on Zn substrates with different definite crystal surfaces can efficiently degrade azo dyes (Congo red and methyl orange) under ambient conditions, requiring neither light illumination nor additional energy (agitation, ultrasonic, etc.).

scholarly journals Green synthesis of zerovalent copper nanoparticles for efficient reduction of toxic azo dyes congo red and methyl orange

2019 ◽  
Vol 8 (1) ◽  
pp. 135-143 ◽  
Author(s):  
Muhammad Ismail ◽  
Saima Gul ◽  
M.I. Khan ◽  
Murad Ali Khan ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Copper Nanoparticles ◽  
Azo Dyes ◽  
Congo Red ◽  
Direct Synthesis ◽  
Visible Spectrum ◽  
Fruit Extract ◽  
Synthesis Mechanism ◽  
Plant Materials ◽  
X Ray

Abstract In this study, plant-mediated copper nanoparticles (CuNPs) were synthesized. Due to its direct synthesis mechanism and eco-friendly nature, the current method accounts for the green chemistry approach using the fruit extract of Duranta erecta for the first time. The UV-visible spectrum of the CuNPs solution showed a distinct absorption peak at 588 nm. Fourier transform infrared spectroscopy confirmed that the fruit extract is responsible for the reduction as well as the stabilization of CuNPs. X-ray diffraction patterns conform the crystalline nature of CuNPs. Energy-dispersive X-ray spectroscopy was performed for elemental analysis whereas field emission scanning electron microscopy was carried out for surface morphology. Prepared CuNPs were used for the reduction of carcinogenic azo dyes methyl orange (MO) and congo red (CR). CuNPs exhibit outstanding catalytic reduction for MO and CR in the presence of NaBH4 as reducing agents with the pseudo-first-order rate constants of 8.6×10−3 s−1 and 5.07×10−3 s−1 for MO and CR, respectively. Thus, natural plant materials act as cheap and environmentally friendly support for the synthesis of CuNPs and could be used for the purification of water from organic dye effluents.

Photocatalytic Mineralization of Azo Dyes Using Nanostructure ZnO Thin Film Coated on Glass Bead

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Mohammad Hossein Habibi ◽  
Mohammad Khaledi Sardashti
Keyword(s):  
Thin Films ◽  
Methyl Orange ◽  
Azo Dyes ◽  
Glass Bead ◽  
Batch Reactor ◽  
Textile Dyes ◽  
Zno Thin Films ◽  
Textile Dye ◽  
Structure Surface ◽  
Zno Powder

AbstractNanostructure ZnO thin films ZnO have been coated on glass bead by our novel centrifuge coating technique. The structure, surface and optical properties of the particles and thin films were characterized by XRD, SEM, AFM and UV/Vis techniques. The photoassisted degradation of four different azo textile dyes (C.I. Reactive Yellow 84 (HR), C.I. Reactive Red 195 (3BF), Erichrome blue black B (EBB) and Methyl orange (MO)) was examined in a batch reactor using nanostructure ZnO thin films on glass beads. The ZnO thin films loading of the glass bead was 0.23% (w/w). The amount of ZnO on the film was about the same the ZnO powder added in suspension to discolor the same solution of the same azo dyes used as a probe. Mineralization (TOC) of the azo textile dyes was attained within ca. 2 h of UV irradiation of the ZnO thin films glass bead/azo textile dye system. Mineralization kinetics was, in general, appreciably influenced by the pH and tends to be somewhat slower in alkaline or acidic media. Methyl orange was photomineralized more slowly than the others. Final products were, in all cases, CO

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