Influence of the fluorescent brightener Periblanc BA on the degree of whiteness of the knitted cotton fabric

In this study the influence of the different fluorescent brightener Periblanc BA concentrations on the degree of knitted cotton fabric whiteness was investigated. Two consecutive experimental runs were performed. The first was the bleaching of the knitted cotton fabric with hydrogen peroxide using the methods of two and single bath exhaustion while the second was the optical bleaching with fluorescent brightener Periblanc BA using the exhaustion method. CIE Whiteness Index and Tint value were measured on the Color-Eye 3000 spectrophotometer at the standard illuminant D65 (Ice-Texicon, d/8, D65/10?) while K/S values were determined using the Kubelka Munk equation. The results show that cotton fabric bleached with fluorescent brightener Periblanc BA after bleaching with hydrogen peroxide using two bath exhaustion method has higher degree of whiteness (118.8) with a reddish tint in comparison to the one bleached with hydrogen peroxide using single bath method (106.1).

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Degree of cotton fabric whiteness obtained by the fluorescent bleaching agent UVITEX BHT and H2O2

Facta universitatis - series Physics Chemistry and Technology ◽

10.2298/fupct2001057m ◽

2020 ◽

Vol 18 (1) ◽

pp. 57-63

Author(s):

Milena Miljkovic ◽

Vojkan Miljkovic ◽

Dusan Trajkovic ◽

Sandra Konstantinovic

Keyword(s):

Hydrogen Peroxide ◽

Cotton Fabric ◽

Cotton Fabrics ◽

Second Phase ◽

Cotton Wool ◽

Bleaching Agent ◽

Color Strength ◽

Whiteness Index ◽

The One ◽

Optical Bleach

In this paper, the influence of the fluorescent bleaching agent, UVITEX BHT optical bleach, on the degree of whiteness of cotton fabric was examined. In the first phase of the test, the bleaching of cotton with hydrogen peroxide, as the bleaching agent, was done. In the second phase, the effect of fluorescent bleaching agent on the whiteness of cotton wool bleached in the first phase was tested. Moreover, the color strength (K/S) and CIE L*a*b* were determined using Coloreye - 3000 spectrophotometer. The whiteness degree achieved with bleaching agent UVITEX BHT was almost twice larger than the one achieved with chemical bleaching compounds. The highest whiteness index (WI) of cotton fabrics was achieved when fluorescent UVITEX BHT bleach was used in the concentration of 0.1%.

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Hydrogen Peroxide Bleaching of Cationized Cotton Fabric

AATCC Journal of Research ◽

10.14504/ajr.6.5.4 ◽

2019 ◽

Vol 6 (5) ◽

pp. 21-29

Author(s):

Sha Fu ◽

Matthew J. Farrell ◽

Mary A. Ankeny ◽

Edwin T. Turner ◽

Victoria Rizk

Keyword(s):

Hydrogen Peroxide ◽

Statistical Model ◽

Magnesium Sulfate ◽

Cotton Fabric ◽

Significant Loss ◽

Bleaching Agent ◽

Color Strength ◽

Whiteness Index ◽

Peroxide Bleaching ◽

Screening Experiment

Hydrogen peroxide (H2O2) is the most commonly used bleaching agent for cotton fabric. However, the conventional H2O2 bleaching formula is not applicable for cationized cotton due to the low whiteness index after bleaching, fabric weakening, and a significant loss of cationic sites. In this work, magnesium sulfate (MgSO4) was added in the H2O2 bleaching formula to stabilize the bleaching system for cationized cotton. Additionally, a screening experiment with temperature and time, and sodium hydroxide (NaOH), H2O2, and MgSO4 concentrations as the factors, and whiteness index, bursting strength, and color strength from dyeing as the responses, was formulated. A statistical model was created using JMP software, which demonstrated how the bleaching conditions influenced the fabric properties. This procedure can be useful for bleaching cationized cotton in production settings.

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The effect of cation concentration on the nitrogen splitting constant of nitroxide free radicals

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19902377 ◽

1990 ◽

Vol 55 (10) ◽

pp. 2377-2380

Author(s):

Hamza A. Hussain

Keyword(s):

Hydrogen Peroxide ◽

Hydrogen Bonding ◽

Free Radicals ◽

Esr Spectroscopy ◽

The Other ◽

Tetraethylammonium Bromide ◽

Splitting Constant ◽

The One ◽

Positively Charged ◽

Two Equilibria

Nitroxide free radicals prepared from diethylamine, piperidine and pyrrolidine by oxidation with hydrogen peroxide were studied by ESR spectroscopy. The changes in the 14N splitting constant (aN) caused by the addition of KBr or tetraethylammonium bromide were measured in dependence on the concentration of the ions. For diethylamine nitroxide and piperidine nitroxide, the results are discussed in terms of two equilibria: the one, involving the anion, is associated with a gain or loss of hydrogen bonds to the nitroxide oxygen atom, the other is associated with the formation of solvent shared units involving the cation, which results in changes in the hydrogen bonding strenght. The large increase in the aN value in the case of pyrrolidine nitroxide is explained in terms of an interaction from one side of the positively charged N atom; the increase in aN in the case of diethylamine and piperidine nitroxides is explained in terms of interactions with both sides of the positively charged N atom.

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Effect of Hydrogen Peroxide in the Growth of Yellow Passion Fruit Seedlings Under Salinity Stress

Journal of Agricultural Science ◽

10.5539/jas.v10n10p151 ◽

2018 ◽

Vol 10 (10) ◽

pp. 151 ◽

Cited By ~ 1

Author(s):

Adriana da S. Santos ◽

Railene H. C. R. Araújo ◽

Reginaldo G. Nobre ◽

Valéria F. de O. Sousa ◽

Marília H. B. S. Rodrigues ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Salinity Stress ◽

Irrigation Water ◽

Block Design ◽

Harmful Effect ◽

Passion Fruit ◽

Biotic And Abiotic Stress ◽

Randomized Block Design ◽

The One ◽

Yellow Passion Fruit

Hydrogen peroxide (H2O2) is a molecule that can flag plants under biotic and abiotic stress conditions. Among the kinds of stress, the salinity stress is the one that most usually affects plants. Consequently, the purpose hereof was to use hydrogen peroxide (H2O2) to mitigate the possible harmful effects of salinity in yellow passion fruit seedlings. We employed a randomized block design, in a 5 × 3 factorial scheme, corresponding to five irrigation water electric conductivity levels (0.3; 1.3; 2.3; 3.3; and 4.3 dS m-1) and three hydrogen peroxide concentrations (0; 5; and 15 μmol L-1), with four repetitions. The treatments were applied foliarly 7 and 15 days after the seedlings’ germination with hand sprayers. Sixty days after sowing, we evaluated the seedlings’ growth and quality variables, which finally proved that hydrogen peroxide mitigates the harmful effect of the irrigation water’s salinity up to 2 dS m-1 in the growth of yellow passion fruit seedlings at the concentration of 5 μmol/L. Nonetheless, excessive concentrations (15 μmol L-1) associated with high salt concentrations were proven detrimental to the seedlings’ phenological growth and quality.

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THE COMPARATIVE RESISTANCE OF BACTERIA AND HUMAN TISSUE CELLS TO CERTAIN COMMON ANTISEPTICS

Journal of Experimental Medicine ◽

10.1084/jem.24.6.683 ◽

1916 ◽

Vol 24 (6) ◽

pp. 683-688 ◽

Cited By ~ 10

Author(s):

Robert A. Lambert

Keyword(s):

Hydrogen Peroxide ◽

Staphylococcus Aureus ◽

Connective Tissue ◽

Human Tissue ◽

Tissue Cultures ◽

Mercuric Iodide ◽

Living Body ◽

Tissue Cells ◽

The One ◽

The Ideal

The comparative resistance of bacteria and human tissue cells to antiseptics and other chemicals may be easily tested by tissue cultures under conditions which approximate those found in the living body. A comparative study shows that while human cells (connective tissue and wandering cells) are highly resistant to many antiseptics, they are in general more easily killed than bacteria (Staphylococcus aureus). Of the antiseptics tested, which include mercuric chloride, iodine, potassium mercuric iodide, phenol, tricresol, hydrogen peroxide, hypochlorites (Dakin's solution), argyrol, and alcohol, the one which approaches most closely the ideal disinfectant is iodine, which kills bacteria in strengths that do not seriously injure connective tissue cells or wandering cells.

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Photoreaktivierung von UV-inaktivierter Polyuridylsäure

Zeitschrift für Naturforschung B ◽

10.1515/znb-1964-0509 ◽

1964 ◽

Vol 19 (5) ◽

pp. 406-408 ◽

Cited By ~ 7

Author(s):

Adolf Wacker ◽

Makoto Ishimoto ◽

Prakash Chandra ◽

Reinhold Selzer

Keyword(s):

Hydrogen Peroxide ◽

Visible Light ◽

Uv Irradiation ◽

Trichloroacetic Acid ◽

Uranyl Acetate ◽

Free System ◽

E Coli ◽

Polyuridylic Acid ◽

A Cell ◽

The One

A study on the effect of UV-irradiated polyuridylic acid on the incorporation of phenylalanine into the polypeptide precipitable through trichloroacetic acid, in a cell-free system from E. coli was made. Attempts were made to reactivate the UV-inactivated polyuridylic acid through hydrogen peroxide, uranyl acetate and visible light. We could show that polyuridylic acid irradiated at a dose of 1.2 ×105 ergs/mm2 could be completely reactivated, while the one irradiated at a higher dose of 2.4 ×105 ergs/mm2 could not be completely reactivated under the conditions of our experiment. We have studied the effects of hydrogen peroxide and uranyl acetate on UV-irradiated polyuridylic acid chemically as well. Our results altogether show that the photoreactivating effect of uranyl acetate and hydrogen peroxide is due to their ability to split the uracil dimers formed during UV-irradiation.

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Stabilization of source-separated human urine by chemical oxidation

Water Science & Technology ◽

10.2166/wst.2013.055 ◽

2013 ◽

Vol 67 (9) ◽

pp. 1901-1907 ◽

Cited By ~ 5

Author(s):

Yang Zhang ◽

Zifu Li ◽

Yuan Zhao ◽

Shuangling Chen ◽

Ibrahim Babatunde Mahmood

Keyword(s):

Hydrogen Peroxide ◽

Ozone Concentration ◽

Human Urine ◽

Heterotrophic Bacteria ◽

Inhibitory Effect ◽

Chemical Oxidation ◽

Urea Hydrolysis ◽

Urine Test ◽

Urine Concentrations ◽

The One

The inhibitory effect of ozone and hydrogen peroxide (HP) on urea hydrolysis in stored urine was investigated and compared. Ozone showed less effect on urea hydrolysis due to the complicated composition of urine (including a large amount of urease-producing bacteria) and bacteria regeneration. Ozone concentration and total heterotrophic bacteria analysis demonstrated that residual ozone concentration decreased by 43% within 15 hr from 13.50 to 7.72 mg/L in the one-time ozonation urine test, and finally completely decomposed within 4 days. In addition, bacteria regenerated quickly after ozone completely decomposed. However, HP showed a significant effect on inhibiting urea hydrolysis not only in stored urine but also in fecal-contaminated urine. The suitable doses of applied HP to inhibit urea hydrolysis in stored urine, concentrations of 0.5 and 1.0 g feces per liter of fecal-contaminated urine, were 0.03, 0.16 and 0.23 mol/L, respectively. The urea concentrations after 2 months stored were 7,145, 7,109 and 7,234 mg/L, respectively.

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Design and Thermodynamic Analysis on One-Step Amination of Benzene to Aniline Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.2607 ◽

2012 ◽

Vol 550-553 ◽

pp. 2607-2611

Author(s):

Chun Hua Yang ◽

Gang Chen ◽

Long Zhang

Keyword(s):

Hydrogen Peroxide ◽

Free Energy ◽

Equilibrium Constant ◽

Gibbs Free Energy ◽

Driving Force ◽

Theoretical Basis ◽

Free Energies ◽

One Step ◽

The One ◽

Further Development

Seven systems of one-step synthesis of aniline were designed, and it was determined which one could occur spontaneously through the calculation of Gibbs free energy of it. Among the seven systems, the Gibbs free energy of the one with ammonia as the aminating agent and hydrogen peroxide as the oxidant was the lowest, thus its process driving force was the largest, that is, .For this system just mentioned above, the standard Gibbs free energies, the equilibrium constant and the equilibrium conversions of benzene under different conditions were discussed ,which was expected to provide a theoretical basis for further development and application of the system.

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Influence of Natural Organic Matter on Oxidation of Volatile Organic Compounds by the H2O2/VisUV Process

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-1997-0306 ◽

1997 ◽

Vol 2 (3) ◽

Author(s):

James M. Symons ◽

Charlene M. Baker ◽

H. William Prengle

Keyword(s):

Hydrogen Peroxide ◽

Rate Constant ◽

Reaction Rate ◽

Tap Water ◽

Reaction Rate Constant ◽

Photon Flux ◽

Excess Hydrogen ◽

Volatile Organic ◽

Natural Organic Material ◽

Experimental Runs

AbstractThis paper presents experimental research to determine the affect of background natural organic material (NOM) on the conversion of five (5) VOC's: 1,1,1-trichloroethane (TCA), benzene (BNZ), trichloroethylene (TCE), 1,4-dichlorobenzene (DCB), and tetrachloroethylene (PCE). Experiments were conducted using DI water and Houston tap water ([TOC] = 3.6 mg/L) as solvents. In addition, the affects of buffer form and excess hydrogen peroxide were determined. Experimental runs were conducted in a photochemical-flow-stirred-tank reactor (pcfSTR), using a 450 W visible/ultraviolet radiation source. The data were analyzed using the Prengle- Shimoda reaction rate model, yielding the reaction rate constant ka (μmols A conv/min, Lr, photon flux) for comparison purposes. Analysis of the experimental data indicated the following conclusions: 1) At the concentrations used for bicarbonate or phosphate buffer, little or no affect was observed; 2) The presence of NOM surpressed the reaction rate for three of the compounds, TCA, BNZ, and PCE at the 95 % confidence level; and 3) Excess hydrogen peroxide, beyond the stoichiometric value, increased the reaction rate constant for all five compounds. The greatest increase was seen for DCB.

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