Degradation of azo dye RP2B by Pseudomonas luteola

1998 ◽  
Vol 38 (4-5) ◽  
pp. 299-306 ◽  
Author(s):  
T. L. Hu
Keyword(s):  
Azo Dye ◽  
Industrial Effluent ◽  
Order Reaction ◽  
Growth Substrate ◽  
First Order ◽  
Orthanilic Acid ◽  
Low Glucose ◽  
Pseudomonas Luteola ◽  
Degradation Ability ◽  
Degradation Of Azo Dye

Pseudomonas luteola grew well in media containing low glucose concentration (0.125%) and no nitrogen source. It had 95% color removability within 5 days through shaking-static incubation process. It was found that the azoreductase of P. luteola was an inducible enzyme; it reacted with RP2B in a first order reaction. The azo dye acted as an inducer without serving as a growth substrate. The metabolic product of the degradation of RP2B by P. luteola was orthanilic acid. P. luteola's high RP2B degradation ability, low nutritient requirement and shaking-static decolorization process enable it to be used in the treatment of industrial effluent containing azo dyes.

Degradation of azo dye with dirhodium(II) caprolactamate as heterogeneous catalyst

2012 ◽  
Vol 65 (12) ◽  
pp. 2175-2182
Author(s):  
Abeer S. Elsherbiny ◽  
Sahar H. El-Khalafy ◽  
Michael P. Doyle
Keyword(s):  
Hydroxyl Radicals ◽  
Azo Dye ◽  
Degradation Kinetics ◽  
Oxidative Degradation ◽  
Total Carbon ◽  
Order Kinetic ◽  
First Order ◽  
Pseudo First Order ◽  
Kinetics Of ◽  
Degradation Of Azo Dye

The kinetics of the oxidative degradation of an azo dye Metanil Yellow (MY) was investigated in aqueous solution using dirhodium(II) caprolactamate, Rh2(cap)4, as a catalyst in the presence of H2O2 as oxidizing agent. The reaction process was followed by UV/Vis spectrophotometer. The decolorization and degradation kinetics were investigated and both followed a pseudo-first-order kinetic with respect to the [MY]. The effects of various parameters such as H2O2 and dye concentrations, the amount of catalyst and temperature have been studied. The studies show that Rh2(cap)4 is a very effective catalyst for the formation of hydroxyl radicals HO• which oxidized and degraded about 92% of MY into CO2 and H2O after 24 h as measured by total carbon analyzer.

scholarly journals Photoisomerization and photoorientation of brilliant yellow in the thin film state

2019 ◽  
Vol 63 (2) ◽  
pp. 169-174
Author(s):  
S. N. Lemiashonak ◽  
Zh. D. Chaplanova ◽  
V. E. Agabekov ◽  
N. A. Ivanova ◽  
I. N. Kukhta
Keyword(s):  
Thin Film ◽  
Azo Dye ◽  
Order Reaction ◽  
Dye Molecules ◽  
Brilliant Yellow ◽  
Reaction Equation ◽  
First Order ◽  
Ultra High Pressure ◽  
Linearly Polarized ◽  
Film State

The features of photoisomerization and photoorientation of azo dye brilliant yellow (BY) in the thin film state are studied. The trans-cis-isomerization of the dye molecules is established to proceed upon irradiation of the films based on BY with a full light of an ultra-high pressure lamp DRT-1000 (UV / VID light), this reaction is described by the first-order reaction equation. Under the action of linearly polarized blue light (λ = 457 nm), an optical anisotropy arises in films of BY. Optically anisotropic films of BY with a high dichroic ratio (>10) are shown to be formed using N-methylpyrrolidone and N, N-dimethylformamide as solvents and cellulose acetate as the polymer matrix.

scholarly journals Degradasi Larutan Pewarna Azo Tekstil Menggunakan Sistem Heterogenan O3, O3/UL, O3/TiO2/UL dan O3/H2O2/UL

2012 ◽  
Author(s):  
Razak Ali ◽  
Wan Azelee Wan Abu Bakar ◽  
Azmi Aris ◽  
Pak Yan Mok
Keyword(s):  
Hydrogen Peroxide ◽  
Azo Dye ◽  
Degradation Rate ◽  
Degradation Process ◽  
Order Reaction ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Photocatalytic System ◽  
Degradation Degree ◽  
Oxidation System

Rawatan larutan pewarna azo tekstil, Sumifix Supra Blue BRF 150% Gran (SSBBRF) melibatkan sistem yang berbeza, O3, O3/UL, 03/TiO2/UL dan O3/H2O2/UL telah dikaji. Keputusan yang diperoleh menunjukkan bahawa degradasi larutan SSBBRF melalui sistem pengoksidaan berasaskan ozon adalah lebih efektif berbanding dengan sistem pemangkinanfoto. Darjah degradasi keserapan dan warna yang tinggi serta degradasi COD dan TOC yang ketara, menunjukkan bahawa sistem pengoksidaan yang berasaskan ozon berupaya memecahkan pewarna azo dalam air tercemar kepada spesies yang lebih terbiorawat. Keputusan yang diperoleh juga menunjukkan bahawa sistem pengozonan (O3 sahaja dalam keadaan gelap), dan sistem gandingan pengozonanfoto–pemangkinanfoto (03/TiO2/UL) tidak menunjukkan perbezaan kadar degradasi pewarna azo yang ketara berbanding sistem pengozonanfoto (O3/UL) tetapi penambahan hidrogen peroksida (H2O2) ke dalam sistem 03/UL mampu meningkatkan lagi kadar degradasi pewarna azo. Perbandingan keupayaan sistem yang dikaji bagi degradasi pewarna SSBBRF adalah mengikut urutan: 03/H202/UL > O3/UL > O3/TiO2/UL > O3 > TiO2/UL. Proses pendegradasian pewarna SSBBRF mematuhi kinetik tindak balas tertib pertama pseudo dengan nilai pemalar kadar, k, dari julat 0.20 min–1 hingga 0.24 min–1 untuk 20 minit yang pertama. Kata kunci: Pewarna azo; pengozonanfoto; pemangkinanfoto; hidrogen peroksida Treatment of aqueous textile azo dye, Sumifix Supra Blue BRF 150% Gran (SSBBRF) by different kinds of systems, 03, O3/UV, 03/TiO2/UV and O3/H2O2/UV has been investigated. The results obtained showed that the degradation of SSBBRF solution involving ozone–assisted oxidation system is more superior compared to photocatalytic system. The high degradation degree of Absorbance and colour as well as the significant degradation of COD and TOC indicated that the ozone–assisited system is capable of disrupting the azo dye in the wastewater to more biotreatable species. The results obtained, also showed that ozonation (O3 alone in dark) system and simultaneous photoozonation–photocatalytic (03/TiO2/UV) system do not give significant effect to the degradation rate of azo dye in comparison with photoozonation (O3/UV) system, but addition of hydrogen peroxide (H202) in the O3/UV system may enhance the degradation rate of the azo dye. The degradation potential of these different systems studied towards SSBBRF are in the following the order: O3/H2O2/UV > O3/UV > 03/TiO2/UV > O3 > TiO2/UV. The degradation process of SSBBRF is following the kinetic of pseudo–first order reaction with the rate constants, k, ranging from 0.20 min–1 up to 0.24 min–1 for the first 20 minutes of the reactions. Key words: Azo dye; photoozonation; photocatalysis; hydrogen peroxide

Visible Light Photocatalytic Degradation of Reactive Deep Blue K-R by BiOI and BiOCl0.2Br0.1I0.7

2012 ◽  
Vol 217-219 ◽  
pp. 1186-1190
Author(s):  
Kai Jin Huang ◽  
Yu Yao Nie ◽  
Yun Liu
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Photocatalytic Performance ◽  
Reaction Kinetic ◽  
Order Reaction ◽  
First Order ◽  
Deep Blue ◽  
Visible Light Degradation ◽  
Visible Light Photocatalytic

The visible-light photocatalytic degradation of an azo dye Reactive Deep Blue K-R by BiOI and BiOCl0.2Br0.1I0.7photocatalysts was investigated. When the reaction proceeded for 1 h under the conditions of 15mg/l Reactive Deep Blue K-R solution and PH=3, the visible-light degradation degrees of Reactive Deep Blue K-R were 93% and 52% for BiOCl0.2Br0.1I0.7and BiOI, respectively.Moreover, the photodegradation of Reactive Deep Blue K-R by BiOI and BiOCl0.2Br0.1I0.7followed a first-order reaction kinetic and the values of k for BiOI and BiOCl0.2Br0.1I0.7are 0.911h-1 and 1.981h-1, respectively. BiOCl0.2Br0.1I0.7exhibits better visible-light-responsive photocatalytic performance for photodegradation of Reactive Deep Blue K-R than BiOI due to the smaller particle size, the larger specific surface area and the stronger redox potential of BiOCl0.2Br0.1I0.7.

scholarly journals Degradation of azo dye by bacterium, Alishewanella sp. CBL-2 isolated from industrial effluent and its potential use in decontamination of wastewater

2018 ◽  
Vol 8 (4) ◽  
pp. 507-515 ◽  
Author(s):  
Mehvish Ajaz ◽  
Amina Elahi ◽  
Abdul Rehman
Keyword(s):  
16S Rrna ◽  
Azo Dye ◽  
Industrial Wastewater ◽  
Industrial Effluent ◽  
Predominant Form ◽  
Rrna Sequencing ◽  
Tlc Analysis ◽  
Layer Chromatography ◽  
Potential Use ◽  
Degradation Of Azo Dye

Abstract In the present study, Alishewanella sp. CBL-2 was characterized on the basis of biochemical and 16S rRNA sequencing. The bacterium was found to decolorize 83% Sumifex Tourqi blue within a period of 6 days at 37 °C and pH 7. The predominant form of the enzyme was found to be extracellular (78%) as compared to intracellular (16%). The breakdown of azo bond was confirmed through thin layer chromatography (TLC) analysis as new bands and peaks were observed in chromatograms of extracted metabolites of decolorized samples. Growth of beneficial microbial fauna in the presence of bacterial decolorized wastewater indicates that this wastewater is safe for the survival of microorganisms. High bioremediation potential makes Alishewanella sp. CBL-2 an impending foundation for green chemistry to remove azo dyes from industrial wastewater.

Leaching Kinetics of Atrazine and Inorganic Chemicals in Tilled and Orchard Soils

2014 ◽  
Vol 28 (2) ◽  
pp. 231-237 ◽  
Author(s):  
Lech W. Szajdak ◽  
Jerzy Lipiec ◽  
Anna Siczek ◽  
Artur Nosalewicz ◽  
Urszula Majewska
Keyword(s):  
Reaction Rate ◽  
Inorganic Compounds ◽  
Model Performance ◽  
Order Reaction ◽  
First Order Reaction ◽  
Order Kinetic ◽  
Time Data ◽  
First Order ◽  
Concentration Changes ◽  
Reaction Constants

Abstract The aim of this study was to verify first-order kinetic reaction rate model performance in predicting of leaching of atrazine and inorganic compounds (K+1, Fe+3, Mg+2, Mn+2, NH4 +, NO3 - and PO4 -3) from tilled and orchard silty loam soils. This model provided an excellent fit to the experimental concentration changes of the compounds vs. time data during leaching. Calculated values of the first-order reaction rate constants for the changes of all chemicals were from 3.8 to 19.0 times higher in orchard than in tilled soil. Higher first-order reaction constants for orchard than tilled soil correspond with both higher total porosity and contribution of biological pores in the former. The first order reaction constants for the leaching of chemical compounds enables prediction of the actual compound concentration and the interactions between compound and soil as affected by management system. The study demonstrates the effectiveness of simultaneous chemical and physical analyses as a tool for the understanding of leaching in variously managed soils.

The Kinetics of Glucose Decomposition with Sulfate Reduction in the Anaerobic Fluidized Bed Reactor

1993 ◽  
Vol 28 (2) ◽  
pp. 135-144 ◽  
Author(s):  
S. Matsui ◽  
R. Ikemoto Yamamoto ◽  
Y. Tsuchiya ◽  
B. Inanc
Keyword(s):  
Sulfate Reduction ◽  
Fluidized Bed ◽  
Kinetic Equations ◽  
Fluidized Bed Reactor ◽  
Order Reaction ◽  
First Order Reaction ◽  
First Order ◽  
Glucose Decomposition ◽  
Reaction Equations ◽  
Kinetics Of

Using a fluidized bed reactor, experiments on glucose decomposition with and without sulfate reduction were conducted. Glucose in the reactor was mainly decomposed into lactate and ethanol. Lactate was mainly decomposed into propionate and acetate, while ethanol was decomposed into propionate, acetate, and hydrogen. Sulfate reduction was not involved in the decomposition of glucose, lactate, and ethanol, but was related to propionate and acetate decomposition. The stepwise reactions were modeled using either a Monod expression or first order reaction kinetics in respect to the reactions. The coefficients of the kinetic equations were determined experimentally. The modified Monod and first order reaction equations were effective at predicting concentrations of glucose, lactate, ethanol, propionate, acetate, and sulfate along the beight of the reactor. With sulfate reduction, propionate was decomposed into acetate, while without sulfate reduction, accumulation of propionate was observed in the reactor. Sulfate reduction accelerated propionate conversion into acetate by decreasing the hydrogen concentration.

Complete monotonicity of entropy production in chemical reaction

1981 ◽  
Vol 46 (2) ◽  
pp. 452-456
Author(s):  
Milan Šolc
Keyword(s):  
Entropy Production ◽  
Equilibrium Constant ◽  
Chemical Reaction ◽  
Relative Entropy ◽  
Order Reaction ◽  
Complete Monotonicity ◽  
First Order Reaction ◽  
First Order ◽  
Completely Monotonic ◽  
Derivatives Of

The successive time derivatives of relative entropy and entropy production for a system with a reversible first-order reaction alternate in sign. It is proved that the relative entropy for reactions with an equilibrium constant smaller than or equal to one is completely monotonic in the whole definition interval, and for reactions with an equilibrium constant larger than one this function is completely monotonic at the beginning of the reaction and near to equilibrium.

Photocolouration of 2,4,4,6-Tetraaryl-4H-pyrans and Their Heteroanalogues: Importance of Hypervalent Photoisomers

1995 ◽  
Vol 60 (10) ◽  
pp. 1621-1633 ◽  
Author(s):  
Stanislav Böhm ◽  
Mojmír Adamec ◽  
Stanislav Nešpůrek ◽  
Josef Kuthan
Keyword(s):  
Reaction Kinetics ◽  
Absorption Spectra ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Theoretical Data ◽  
Order Reaction ◽  
Bleaching Process ◽  
First Order ◽  
Photodegradation Products ◽  
Hypervalent Molecules

Molecular geometries of 2,4,4,6-tetraphenyl-4H-pyran (Ia), 4,4-(biphenyl-2,2e-diyl)-2,6-diphenyl-4H-pyran (Ib) and their heterocyclic isomers II-V were optimized by the PM3 method and used for the calculation of electronic absorption spectra by the CNDO/S-CI procedure. Comparison of the theoretical data with experimental UV-VIS absorption spectra made possible to select hypervalent molecules IIIa, IIIb, IVa and IVb being responsible for the photocolouration of 4H-pyrans Ia, Ib, while compounds Va, Vb, VI and VII come into account as possible photodegradation products. The bleaching process of the UV illuminated compound Ia is analyzed in terms of dispersive first-order reaction kinetics.

Kinetics and Mechanism of Hexachloroiridate(IV) Oxidation of Arsenic(III) in Acidic Perchlorate Solutions

1992 ◽  
Vol 57 (7) ◽  
pp. 1451-1458 ◽  
Author(s):  
Refat M. Hassan
Keyword(s):  
Ionic Strength ◽  
Fractional Order ◽  
Activation Parameters ◽  
Order Reaction ◽  
First Order Reaction ◽  
Intermediate Complex ◽  
Constant Ionic Strength ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Kinetics Of

The kinetics of oxidation of arsenic(III) by hexachloroiridate(IV) at lower acid concentrations and at constant ionic strength of 1.0 mol dm-3 have been investigated spectrophotometrically. A first-order reaction in [IrCl62-] and fractional order with respect to arsenic(III) have been observed. A kinetic evidence for the formation of an intermediate complex between the hydrolyzed arsenic(III) species and the oxidant was presented. The results showed that decreasing the [H+] is accompanied by an appreciable acceleration of the rate of oxidation. The activation parameters have been evaluated and a mechanism consistent with the kinetic results was suggested.

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