scholarly journals Water Contaminated by Industrial Textile Dye: Study on Decolorization Process

Environments ◽  
2019 ◽  
Vol 6 (9) ◽  
pp. 101 ◽  
Author(s):  
Pierantonio De Luca ◽  
Paola Foglia ◽  
Carlo Siciliano ◽  
Jànos B. Nagy ◽  
Anastasia Macario
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Oxide ◽  
Sodium Carbonate ◽  
Dye Degradation ◽  
Reaction Rates ◽  
Textile Dye ◽  
Reactive Black 5 ◽  
Experimental Conditions ◽  
Textile Industries

This work aims to investigate possible interferences due to the presence of sodium carbonate on the photodegradation of the reactive Black 5 azoic dye, both in systems containing only titanium oxide and those containing titanium oxide and hydrogen peroxide. The role of hydrogen peroxide is explicitly treated. Sodium carbonate, in fact, is often present in the wastewater of textile industries as it is used in the fiber dyeing phases. The use of TiO2 nanoparticles is emphasized, and the possible danger is underlined. Each system was subjected to ultraviolet irradiation (UV) by varying the exposure time. After the photodegrading tests, the resulting solutions were analyzed by UV-vis spectrophotometry and High-Resolution Nuclear Magnetic Resonance to measure the residual concentrations of dye. The dye degradation curves and reaction rates for different UV exposure times were obtained and discussed as a function of the used additives. All the data are repeated three times, and they differ only by a maximum of 5%. The results indicated a reduction of about 50% of the initial concentration of Reactive Black 5 after 30 min under optimal experimental conditions. The NMR analysis indicated the formation of a series of aromatic structures that were generated by the UV-induced photochemical fragmentation of the original molecule.

scholarly journals Metmyoglobin Oxidation during Electron Transport Reactions in Mitochondria

1965 ◽  
Vol 48 (4) ◽  
pp. 685-698 ◽  
Author(s):  
Ann E. Kaplan-Bresler
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Transport ◽  
Dissolved Oxygen ◽  
Heart Muscle ◽  
Absorption Peak ◽  
Experimental Conditions ◽  
Simultaneous Oxidation

Studies of the intracellular role of myoglobin were carried out by recording spectrophotometric changes in acid metmyoglobin and oxymyoglobin during electron transport reactions with mitochondria prepared from pigeon heart muscle by the method of Chance and Hagihara. The absorption peak of metmyoglobin at 409 mµ disappeared when substrate was added to normal or antimycin-inhibited preparations, and was replaced by a new maximum at 423 to 424 mµ, identified as due to the oxidation to ferrylmyoglobin. Further investigation revealed that the oxidation of metmyoglobin took place with the simultaneous oxidation of reduced flavoprotein. Hydrogen peroxide, formed by the reaction of reduced flavoprotein with oxygen, was considered to be the probable intermediate for the oxidation of metmyoglobin in experiments in which catalase was added as a competitor for the oxidant. When DPNH was added to the reaction mixture, the reductant acted to resynthesize the ferri-derivative by reaction with ferrylmyoglobin. Oxymyoglobin could not be used in place of metmyoglobin in these systems. Under the experimental conditions, oxymyoglobin dissociated when dissolved oxygen was depleted from the medium by enzyme oxidations; the resultant ferromyoglobin underwent oxidation to metmyoglobin.

scholarly journals Degradation of Reactive Dyes by Thermally Activated Persulfate and Reuse of Treated Textile Dye-Bath

2021 ◽  
Author(s):  
Amanda Basilio ◽  
Lucas Dohler ◽  
Matheus Servin ◽  
Carlos Gouvea ◽  
Ronny Ribeiro ◽  
...  
Keyword(s):  
Textile Industry ◽  
Dye Degradation ◽  
Textile Dyes ◽  
Color Removal ◽  
Textile Dye ◽  
Reactive Black 5 ◽  
Thermally Activated ◽  
Good Potential ◽  
High Concentrations ◽  
Activated Persulfate

Due to the usual resistance of textile dyes to conventional biological treatment processes, the color removal of dyeing wastewaters remains a challenge for the textile industry. This work evaluates the capacity of advanced oxidation processes based on thermally-activated persulfate concerning textile dyes’ degradation in aqueous solution and the reuse of dyeing baths. Preliminary studies were carried out in a bench-scale jacketed reactor, using Reactive Black 5 (40 mg L-1) as a model dye. Almost complete dye degradation was observed in 60 min in this stage, using 300 mg L-1 of persulfate and activation temperatures of 80 ºC, basically due to the action of radical sulfate. The use of high concentrations of persulfate (1000 mg L-1) allowed efficient color removal of dyeing baths containing remazol dyes in processes activated at 80 and 90 ºC. However, the wastewaters treated under these conditions did not lead to high dyeing efficiency in reuse studies, probably due to residual persulfate presence. In contrast, low concentrations of persulfate (250 mg L-1) lead to partial color removal and a better dyeing quality. The results suggest a good potential for treating high-temperature dyeing baths, saving water and auxiliary agents used in textile dyeing processes.

scholarly journals Degradation of Reactive Blue 19 (RB19) by a Green Process Based on Peroxymonocarbonate Oxidation System

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Thi Bich Viet Nguyen ◽  
Ngan Nguyen-Bich ◽  
Ngoc Duy Vu ◽  
Hien Ho Phuong ◽  
Hanh Nguyen Thi
Keyword(s):  
Uv Irradiation ◽  
Dye Degradation ◽  
Textile Dye ◽  
Experimental Conditions ◽  
Reactive Blue 19 ◽  
Toc Removal ◽  
Reaction Orders ◽  
Ph Range ◽  
Oxidation System

The effectiveness of peroxymonocarbonate ( HCO 4 − ) on the degradation of Reactive Blue 19 (RB19) textile dye was investigated in this study. The formation kinetics of HCO 4 − produced in situ in a H 2 O 2 − HCO 3 − system was studied to control the experimental conditions for the investigation of RB19 degradation at mild conditions. The effects of metallic ion catalysts, the pH, the input HCO 3 − and Co2+ concentrations, and UV irradiation were studied. The obtained result showed that Co2+ ion gave the highest efficiency on accelerating the rate of RB19 degradation by the H2O2– HCO 3 − system. In the pH range of 7–10, the higher pH values resulted in faster dye degradation. The reaction orders of the RB19 degradation with respect to Co2+ and HCO3– were determined to be 1.2 and 1.7, respectively. The UV irradiation remarkably enhanced the radical formation in the oxidation system, which led to high degradation efficiencies. The COD, TOC removal, and HPLC results clearly revealed complete mineralization of RB19 by the H 2 O 2 − HCO 3 − − Co 2 + system.

Electrochemical degradation of industrial textile dye disperse yellow 3: Role of electrocatalytic material and experimental conditions on the catalytic production of oxidants and oxidation pathway

Chemosphere ◽  
2018 ◽  
Vol 198 ◽  
pp. 21-29 ◽  
Author(s):  
Ricardo Salazar ◽  
M. Soledad Ureta-Zañartu ◽  
Camilo González-Vargas ◽  
Christiane do Nascimento Brito ◽  
Carlos A. Martinez-Huitle
Keyword(s):  
Textile Dye ◽  
Electrochemical Degradation ◽  
Experimental Conditions ◽  
Oxidation Pathway

The Role of Free‐Radical Pathway in Catalytic Dye Degradation by Hydrogen Peroxide on the Zr‐Based UiO‐66‐NH 2 MOF

2021 ◽  
Vol 6 (42) ◽  
pp. 11675-11681
Author(s):  
Ahmed H. Ibrahim ◽  
Rana R. Haikal ◽  
Reham Shams Eldin ◽  
Worood A. El‐Mehalmey ◽  
Mohamed H. Alkordi
Keyword(s):  
Hydrogen Peroxide ◽  
Free Radical ◽  
Dye Degradation

scholarly journals Hydrogen peroxide discolors blood in the cavity of the hematoma under the nail and in the skin over the bruise

2020 ◽  
Vol 19 (2) ◽  
pp. 67-74
Author(s):  
A. L. Urakov ◽  
N. A. Urakova
Keyword(s):  
Hydrogen Peroxide ◽  
Venous Blood ◽  
Intradermal Injection ◽  
Alkaline Solutions ◽  
Experimental Conditions ◽  
Medical Standards ◽  
Subungual Hematoma ◽  
Clinical Conditions ◽  
Osmotic Activity

Purpose. Modern medical standards do not contain information about the urgent bleaching of nail hematomas and bruises. The aim of this work is developing of new ways and means for blood bleaching of the bruising and subungual hematomas for its immediate discoloration. Materials and methods. The peculiarities of hydrogen peroxide effect on blood color alteration in different environment have been studied in laboratory, by experiment and in clinical conditions. We studied the peroxide effect on liquid and dry venous blood in a Petri dishes, in bloody gauze bandages, on the surface of the skin, in hematoma under the nail in humans and in the skin over the bruise created by intradermal injection of pig blood. The studies take into account the role of local interaction such factors as the duration of interaction, the concentration of ingredients, local temperature, the value of alkaline and osmotic activity of the studied solutions. The results were recorded by color photo and video. Results. In laboratory and experimental conditions the red and blue blood as well as red, brown and/or blue stained tissues were shown to be urgently bleached by alkaline solutions of hydrogen peroxide. Hemoglobin was found to be the «dye» of blood-stained tissues. We listed the inventions to the intradermal bruising discoloration, subungual hematomas, and fresh and dried blood. The main ingredients of the inventions for intradermal and subungual hematomas bleaching are reported. The essence of the invented methods of skin and nail hematomas discoloration is presented. Conclusion. The alkaline solution of hydrogen peroxide can be used for emergency discoloration subungual hematoma, the skin in the area of bruise and the bandage stained with blood.

Evaluation of Textile Dye Degradation Due to the Combined Action of Enzyme Horseradish Peroxidase and Hydrogen Peroxide

2014 ◽  
Vol 174 (8) ◽  
pp. 2741-2747 ◽  
Author(s):  
A. R. Pereira ◽  
R. S. da Costa ◽  
L. Yokoyama ◽  
E. M. Alhadeff ◽  
L. A. C. Teixeira
Keyword(s):  
Hydrogen Peroxide ◽  
Horseradish Peroxidase ◽  
Dye Degradation ◽  
Textile Dye ◽  
Combined Action

Site of Lysosome Production During Hepatic Injury

1969 ◽  
Vol 27 ◽  
pp. 348-349
Author(s):  
Nalin J. Unakar
Keyword(s):  
Electron Microscopy ◽  
Golgi Apparatus ◽  
Mouse Liver ◽  
Hepatic Injury ◽  
Close Approximation ◽  
Experimental Conditions ◽  
Toxic Injury

The increased number of lysosomes as well as the close approximation of lysosomes to the Golgi apparatus in tissue under variety of experimental conditions is commonly observed. These observations suggest Golgi involvement in lysosomal production. The role of the Golgi apparatus in the production of lysosomes in mouse liver was studied by electron microscopy of liver following toxic injury by CCI4.

SEM analysis of the change in the reaction rates with deposit structures in the copper-iron cementation system

1978 ◽  
Vol 36 (1) ◽  
pp. 456-457
Author(s):  
V. Annamalai ◽  
L.E. Murr
Keyword(s):  
Structural Characteristics ◽  
Secondary Electron Emission ◽  
Copper Deposit ◽  
Reaction Rates ◽  
Sem Analysis ◽  
Experimental Conditions ◽  
Major Drawback ◽  
Emission Mode ◽  
Scrap Iron ◽  
Image Position

Economical recovery of copper metal from leach liquors has been carried out by the simple process of cementing copper onto a suitable substrate metal, such as scrap-iron, since the 16th century. The process has, however, a major drawback of consuming more iron than stoichiometrically needed by the reaction.Therefore, many research groups started looking into the process more closely. Though it is accepted that the structural characteristics of the resultant copper deposit cause changes in reaction rates for various experimental conditions, not many systems have been systematically investigated. This paper examines the deposit structures and the kinetic data, and explains the correlations between them.A simple cementation cell along with rotating discs of pure iron (99.9%) were employed in this study to obtain the kinetic results The resultant copper deposits were studied in a Hitachi Perkin-Elmer HHS-2R scanning electron microscope operated at 25kV in the secondary electron emission mode.

The role of copper ions in hydrogen peroxide bleaching: Their origin, removal, and effect on pulp quality

TAPPI Journal ◽  
2012 ◽  
Vol 11 (7) ◽  
pp. 37-46 ◽  
Author(s):  
PEDRO E.G. LOUREIRO ◽  
SANDRINE DUARTE ◽  
DMITRY V. EVTUGUIN ◽  
M. GRAÇA V.S. CARVALHO
Keyword(s):  
Hydrogen Peroxide ◽  
Copper Ions ◽  
Peroxide Bleaching ◽  
Metals Removal ◽  
Peroxide Decomposition ◽  
Equipment Corrosion ◽  
And Performance ◽  
And Control ◽  
Main Effects

This study puts particular emphasis on the role of copper ions in the performance of hydrogen peroxide bleaching (P-stage). Owing to their variable levels across the bleaching line due to washing filtrates, bleaching reagents, and equipment corrosion, these ions can play a major role in hydrogen peroxide decomposition and be detrimental to polysaccharide integrity. In this study, a Cu-contaminated D0(EOP)D1 prebleached pulp was subjected to an acidic washing (A-stage) or chelation (Q-stage) before the alkaline P-stage. The objective was to understand the isolated and combined role of copper ions in peroxide bleaching performance. By applying an experimental design, it was possible to identify the main effects of the pretreatment variables on the extent of metals removal and performance of the P-stage. The acid treatment was unsuccessful in terms of complete copper removal, magnesium preservation, and control of hydrogen peroxide consumption in the following P-stage. Increasing reaction temperature and time of the acidic A-stage improved the brightness stability of the D0(EOP)D1AP bleached pulp. The optimum conditions for chelation pretreatment to maximize the brightness gains obtained in the subsequent P-stage with the lowest peroxide consumption were 0.4% diethylenetriaminepentaacetic acid (DTPA), 80ºC, and 4.5 pH.

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