Efficient Oxidative Degradation of Azo Dyes by a Water-Soluble Manganese Porphyrin Catalyst

ChemCatChem ◽  
2013 ◽  
Vol 5 (3) ◽  
pp. 796-805 ◽  
Author(s):  
Tapan Kumar Saha ◽  
Holm Frauendorf ◽  
Michael John ◽  
Sebastian Dechert ◽  
Franc Meyer
Keyword(s):  
Azo Dyes ◽  
Oxidative Degradation ◽  
Water Soluble ◽  
Manganese Porphyrin

Oxidative Degradation of Toxic Organic Pollutants by Water Soluble Nonheme Iron(IV)-Oxo Complexes of Polydentate Nitrogen Donor Ligands

2021 ◽  
Author(s):  
Sandip Munshi ◽  
Rahul Dev Jana ◽  
Tapan Kanti Paine
Keyword(s):  
Organic Pollutants ◽  
Oxidative Degradation ◽  
Heme Iron ◽  
Water Soluble ◽  
Donor Ligands ◽  
Nitrogen Donor Ligands ◽  
Polydentate Ligands ◽  
Oxo Complexes ◽  
Non Heme Iron ◽  
Nitrogen Donor

The ability of four mononuclear non-heme iron(IV)-oxo complexes supported by nitrogen donor polydentate ligands in degrading organic pollutants has been investigated. The water soluble iron(II) complexes upon treatment with ceric...

Decoloration of Azo Dyes by Hydrogen Peroxide Catalyzed by Water-Soluble Manganese Porphyrins

1999 ◽  
Vol 69 (12) ◽  
pp. 956-960 ◽  
Author(s):  
J. Tokuda ◽  
R. Ohura ◽  
T. Iwasaki ◽  
Y. Takeuchi ◽  
A. Kashiwada ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Azo Dyes ◽  
Water Soluble ◽  
Manganese Porphyrins

Chlorite Dismutation to Chlorine Dioxide Catalyzed by a Water-Soluble Manganese Porphyrin

2010 ◽  
Vol 50 (3) ◽  
pp. 699-702 ◽  
Author(s):  
Scott D. Hicks ◽  
Jennifer L. Petersen ◽  
Curt J. Bougher ◽  
Mahdi M. Abu-Omar
Keyword(s):  
Chlorine Dioxide ◽  
Water Soluble ◽  
Manganese Porphyrin

Development of novel pH-sensitive azo dyes from Cardanol as a bioresource

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Siddhesh Umesh Mestry ◽  
Umesh Ratan Mahajan ◽  
Aswathy M. ◽  
Shashank T. Mhaske
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Density Functional ◽  
Ph Sensitivity ◽  
Water Soluble ◽  
Hydroxyl Group ◽  
Disulfonic Acid ◽  
Colour Properties ◽  
Content Type ◽  
Good Thermal Stability

Purpose The purpose of this paper is to use the bio-based resource as the starting material for the synthesis of azo dye. Cardanol is one of the most used bio-based resources for carrying out the synthesis of various compounds having numerous end applications. The study presents an attempt to develop an azo dye from Cardanol having end applications in pH-responsive dyes. Design/methodology/approach The cardanol was sulfonated to block the para position by which ortho positioned hydroxyl group after diazotization and coupling will provide necessary pH-sensitivity. The diazotization of two naphthalene derivatives, i.e. 1-naphthol-8-amino-3,6-disulfonic acid (H-acid) and 7-amino-4-hydroxy-2-naphthalene sulfonic acid (J-acid) was carried out using the standard practice, and the diazotized compounds were coupled with the sulfonated cardanol. The obtained dyes were characterized by Fourier transform infrared, nuclear magnetic resonance, carbon-hydrogen-nitrogen-sulfur analysis and hydroxyl value. The colour properties were checked using UV-vis spectrophotometry and density functional theory, while thermogravimetric analysis was used for the thermal degradation studies of both the dyes. Findings Water-soluble cardanol-based azo dyes were prepared successfully having good thermal stability, and the obtained results are being presented in this paper. Originality/value The originality lies between the use of cardanol as a bio-based resource for the synthesis of azo-dye and the obtained azo-dye has the pH-sensitivity.

Synthesis, thermal stability, electronic features, and antimicrobial activity of phenolic azo dyes and their Ni(II) and Cu(II) complexes

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Selma Bal ◽  
Sedat Bal ◽  
Abdullah Erener ◽  
Hatice Halipci ◽  
Seyhan Akar
Keyword(s):  
Thermal Stability ◽  
Antimicrobial Activity ◽  
Antifungal Activity ◽  
Azo Dyes ◽  
Coordination Compounds ◽  
Decomposition Temperature ◽  
Water Soluble ◽  
The Other ◽  
Spectroscopic Methods ◽  
Antimicrobial And Antifungal Activity

AbstractFour water soluble azo dyes, 4-(isopropyl)-2-[(E)-(4-chlorophenyl)diazenyl]phenol (L 1), 4-(isopropyl)-2-[(E)-(2,4-dichlorophenyl)diazenyl]phenol (L2), 4-(sec-butyl)-2-[(E)-(4-chlorophenyl) diazenyl]phenol (L 3), 4-(sec-butyl)-2-[(E)-(2,4-dichlorophenyl)diazenyl]phenol (L 4), and their Cu(II) and Ni(II) complexes were synthesized and characterized using spectroscopic methods. Examination of their thermal stability revealed similar decomposition temperature of approximately 260–300°C and that they were more thermally stable than their metal complexes. Ni(II) complexes of ligands L2 and L4 were more stable than the other coordination compounds. Among the synthesized ligands, L2 and the complexes Cu(L3)2 and Ni(L4)2 showed both antimicrobial and antifungal activity. However, the other ligands and the complexes were poorly active against selected microorganisms.

Mechanistic study of a manganese porphyrin catalyst for on-demand production of chlorine dioxide in water

2015 ◽  
Vol 19 (01-03) ◽  
pp. 492-499 ◽  
Author(s):  
Scott D. Hicks ◽  
Silei Xiong ◽  
Curt J. Bougher ◽  
Grigori A. Medvedev ◽  
James Caruthers ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Chlorine Dioxide ◽  
Transfer Reaction ◽  
Water Soluble ◽  
Reaction Pathways ◽  
Mechanistic Study ◽  
Manganese Porphyrin ◽  
Oxygen Atom Transfer ◽  
On Demand ◽  
Proton Coupled Electron Transfer

A water-soluble manganese porphyrin complex was examined for the catalytic formation of chlorine dioxide from chlorite under ambient temperature at pH 5.00 and 6.90. Quantitative kinetic modeling allowed for the deduction of a mechanism that accounts for all experimental observations. Catalysis is initiated via an OAT (Oxygen Atom Transfer) reaction resulting in formation of a putative manganese(V) oxo species, which undergoes ET (Electron Transfer) with chlorite to form chlorine dioxide. As chlorine dioxide accumulates in solution, chlorite consumption slows down and ClO 2 reaches a maximum as the system reaches equilibrium. In phosphate buffer at pH 6.90, manganese(IV) oxo accumulates and its reaction with ClO 2 gives ClO 3-. However, at pH 5.00 acetate buffer proton coupled electron transfer (PCET) from chlorite to manganese(IV) oxo is fast and irreversible leading to chlorate formation only via the putative manganese(V) oxo species. These differences underscore how PCET rates affect reaction pathways and mechanism. The ClO 2 product can be collected from the aqueous reaction mixture via purging with an inert gas, allowing for the preparation of chlorine dioxide on-demand.

Kinetics of metribuzin degradation by colloidal manganese dioxide in absence and presence of surfactants

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Qamruzzaman ◽  
Abu Nasar
Keyword(s):  
Sodium Dodecyl ◽  
Oxidative Degradation ◽  
Activation Parameters ◽  
Water Soluble ◽  
Ionic Surfactant ◽  
Ammonium Bromide ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Colloidal Mno2 ◽  
Kinetics Of

AbstractThe kinetics of the degradation of metribuzin by water-soluble colloidal MnO2 in acidic medium (HClO4) were studied spectrophotometrically in the absence and presence of surfactants. The experiments were performed under pseudo-first-order reaction conditions in respect of MnO2. The degradation was observed to be of the first order in respect of MnO2 while of fractional order for both metribuzin and HClO4. The rate constant for the degradation of metribuzin was observed to decrease as the concentration of MnO2 increased. The anionic surfactant, sodium dodecyl sulphate (SDS), was observed to be ineffective whereas the non-ionic surfactant, Triton X-100 (TX-100), accelerated the reaction rate. However, the cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), caused flocculation with oppositely-charged colloidal MnO2; hence further study was not possible. The catalytic effect of TX-100 was discussed in the light of the available mathematical model. The kinetic data were exploited to generate the various activation parameters for the oxidative degradation of metribuzin by colloidal MnO2 in the absence as well as the presence of the non-ionic surfactant, TX-100.

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