Photocatalytic Clearing of Disperse Dyed Polyester

2019 ◽  
Vol 6 (5) ◽  
pp. 10-15 ◽  
Author(s):  
Semiha Eren
Keyword(s):  
Hydrogen Peroxide ◽  
Uv Irradiation ◽  
Room Temperature ◽  
Color Difference ◽  
Polyester Fabric ◽  
Disperse Dyes ◽  
Wash Fastness ◽  
Ph Values ◽  
Thiourea Dioxide ◽  
Color Differences

Trials were conducted to examine the efficiency of photocatalytic afterclearing on disperse dyed polyester. The photocatalytic afterclearing was performed by ultraviolet (UV) irradiation and hydrogen peroxide (H2O2). Polyester fabric samples were dyed with three disperse dyes at 4% depth of shade, individually. The control afterclearing treatment was a conventional reductive clearing by thiourea dioxide and caustic soda. The H2O2 impregnated samples, using various concentrations of H2O2 at various pH values, were treated under 254 nm UV irradiation (5, 10, 20, and 30 min) at room temperature. Color, color difference, wash fastness, and tensile strength values of the samples were compared. Photocatalytic clearing of disperse dyed polyester was successful in giving comparable wash fastness results as compared to conventional reduction clearing without significant color differences.

Effects of Disperse Dyes on Dyeing of Ethylated Chinese Fir Powder

2013 ◽  
Vol 788 ◽  
pp. 241-245 ◽  
Author(s):  
Ze Hua Yu ◽  
Jing Fang Tang ◽  
Xiao Qiao Wan ◽  
Xiu Chen ◽  
Wei Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Smooth Surface ◽  
Ph Value ◽  
Polyester Fabric ◽  
Chinese Fir ◽  
Disperse Dyes ◽  
Wash Fastness ◽  
Ft Ir ◽  
Reflection Of Light

The dyeing properties of ethylated Chinese fir powder with disperse dyes under high temperature and high pressure were investigated in this paper, the dyeing results indicated that the color shade of dyed ethylated fir is similar to that of dyed polyester fabric while PH value of dyeing solution is between 4~5, and the dyed sample is of a good wash fastness. At the same time, the characteristics of the samples were analyzed by FT-IR and SEM, it indicated that dyes molecules were adsorbed on the surface and went into the microporous of ethylated fir powder, so that brighter color were observed due to the fact that the ethylated fir powder leads to a smooth surface which being favorable for the reflection of light.

Reaction of Thiourea with Hydrogen Peroxide: 13C NMR Studies of an Oxidative/Reductive Bleaching Process

1992 ◽  
Vol 62 (2) ◽  
pp. 94-100 ◽  
Author(s):  
Mustafa Arifoglu ◽  
William N. Marmer ◽  
Robert L. Dudley
Keyword(s):  
Hydrogen Peroxide ◽  
Redox Potential ◽  
Rapid Change ◽  
Molar Ratio ◽  
Initial Reaction ◽  
Neutral Medium ◽  
Sufficient Data ◽  
Nmr Studies ◽  
Ph Values ◽  
Thiourea Dioxide

Thiourea's reaction with hydrogen peroxide in solution under bleaching conditions at three different pH values has been investigated using 13C NMR spectroscopy. Since this reaction is fast and exothermic, it is essential that short total acquisition times be used to accumulate sufficient data to detect different species formed during the reaction. As the abundance of 13C in the reactants in the concentration range studied is very low, 13C-labeled thiourea was used as the starting material. Sufficient data were accumulated in short acquisition times (2–4 minutes) to identify different species formed during the reaction. The results showed that different intermediate products are formed during the reactions, depending on the pH of the medium and the molar ratio of the reactants. The reaction goes through a thiourea dioxide intermediate; this then hydrolyzes under heat and neutral or alkaline conditions to yield sulfonate anion and urea if the initial reaction of thiourea with hydrogen peroxide is allowed to take place in acidic/neutral medium (pH = 4.0–7.0). Because thiourea dioxide hydrolyzes in solution, there is a rapid change in redox potential from a positive value to a high negative value. The species causing the negative redox potential, and hence the species responsible for reductive bleaching, is believed to be the sulfinate anion. The reaction of thiourea with hydrogen peroxide in hydrochloric acid at pH < 1 results in the formation of formamidine disulfide dihydrochloride, which decomposes at pH values greater than 1.

UV irradiation induced formation of Au nanoparticles at room temperature: The case of pH values

2007 ◽  
Vol 301 (1-3) ◽  
pp. 174-183 ◽  
Author(s):  
Shengchun Yang ◽  
Yaping Wang ◽  
Qingfeng Wang ◽  
Ruili Zhang ◽  
Bingjun Ding
Keyword(s):  
Uv Irradiation ◽  
Room Temperature ◽  
Au Nanoparticles ◽  
Ph Values

Dyeing Properties of Cyanoethylated Wood with Disperse Dyes

2012 ◽  
Vol 531 ◽  
pp. 308-311 ◽  
Author(s):  
Xiao Qiao Wan ◽  
Fang Zhao ◽  
Ze Hua Yu ◽  
Ying Zhao
Keyword(s):  
Electron Microscopy ◽  
Color Difference ◽  
Polyester Fabric ◽  
Disperse Dyes ◽  
High Temperature And Pressure ◽  
Ft Ir ◽  
Temperature And Pressure ◽  
Unmodified Wood ◽  
Scanning Electron ◽  
Modified Wood

The color cyanoethylated wood were preparated by means of dyeing under high temperature and pressure. The results indicates that the percentage of dye exhaustion (%E) on cyanoethylated fir powder is 95.3~98.8%. The color shade of dyed modified wood is similar to that of dyed polyester fabric. Compared with the dyed polyester fabric, the color difference (∆E) of dyed modified wood is smaller than that of dyed unmodified wood under the same dyeing condition. Unmodified fir powder, cyanoethylated fir powder and dyed cyanoethylated fir powder were characterized by Fouriertrans- form infrared (FT-IR), scanning electron microscopy (SEM).

Dyeing Properties of Acetylated Wood with Red Disperse Dyes

2011 ◽  
Vol 335-336 ◽  
pp. 1061-1066 ◽  
Author(s):  
Ying Zhao ◽  
Xiao Yan Tan ◽  
Xiao Qiao Wan ◽  
Wei Liu ◽  
Ze Hua Yu
Keyword(s):  
Ir Spectra ◽  
Dye Removal ◽  
Color Difference ◽  
Polyester Fabric ◽  
Disperse Dyes ◽  
Color Fastness ◽  
Dyeing Properties ◽  
Excellent Color ◽  
Unmodified Wood ◽  
Modified Wood

The dyeing properties of acetylated fir powder and acetylated poplar spill with 8 red disperse dyes were studied in this paper. The dyeing results indicate that the percentage of dye exhaustion (% E)on acetylated fir powder is 96~99%. As for acetylated poplar spill, the percentage of dye exhaustion reaches 58~78%. The color shade of dyed modified wood is similar to that of dyed polyester fabric. Compared with the dyed polyester fabric, the color difference(∆E) of dyed modified wood is smaller than that of dyed unmodified wood under the same dyeing conditions. Furthermore, modified fir powder has excellent color fastness to washing, the dye removal of dyed acetylated fir powder is 0.4 ~ 1.8 % at 80°C for 2 h in the water. Both the Infrared (IR) spectra and microscopic images of fir powder, acetylated fir powder and dyed acetylated fir powder were investigated.

Effects of nanoTiO2–SiO2 on the hydrophilicity/dyeability of polyester fabric and photostability of disperse dyes under UV irradiation

2014 ◽  
Vol 253 ◽  
pp. 185-193 ◽  
Author(s):  
Darinka Fakin ◽  
Karin Stana Kleinschek ◽  
Manja Kurečič ◽  
Alenka Ojstršek
Keyword(s):  
Uv Irradiation ◽  
Polyester Fabric ◽  
Disperse Dyes

The Study of Photoreversibility, Photopolimerization and Photocleavage Properties of Polyurethane Coumarin by Means of Electronic Spectrometry and AFM Methods

2017 ◽  
Vol 68 (7) ◽  
pp. 1632-1635
Author(s):  
Silviu Gurlui ◽  
Emil Buruiana ◽  
Ioan Gabriel Sandu ◽  
Mitachi Strat
Keyword(s):  
Uv Irradiation ◽  
Room Temperature ◽  
Dimethyl Formamide ◽  
Photon Excitation ◽  
Photochemical Properties ◽  
Film State

The spectroscopic and photochemical properties of polyurethane coumarin (PUC) in dimethyl sulf-oxide (DMSO), thetra hydro furan (THF), dimethyl formamide (DMF) and film state were investigated at room temperature under one photon excitation. The results show that under irradiation of l ] 310 nm photodimerization process are increased and under UV irradiation with l[ 260 nm, photocleavage of polymer have been evidenced, too.

scholarly journals Enhanced Oil Removal by a Non-Toxic Biosurfactant Formulation

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 467
Author(s):  
Emília Mendes da Silva Santos ◽  
Isabela Regina Alvares da Silva Lira ◽  
Hugo Moraes Meira ◽  
Jaciana dos Santos Aguiar ◽  
Raquel Diniz Rufino ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Aeration Rate ◽  
Oil Removal ◽  
Central Composite Rotatable Design ◽  
Chemical Methods ◽  
Ph Values ◽  
Spectroscopic Analyses ◽  
New Formulation ◽  
Central Composite

In this study, a new formulation of low-cost, biodegradable, and non-toxic biosurfactant by Candida sphaerica UCP 0995 was investigated. The study was conducted in a bioreactor on an industrial waste-based medium, and a central composite rotatable design was used for optimization. The best results, namely a 25.22 mN/m reduction in surface tension, a biosurfactant yield of 10.0 g/L, and a critical micelle concentration of 0.2 g/L, were achieved in 132 h at an agitation speed of 175 rpm and an aeration rate of 1.5 vvm. Compositional and spectroscopic analyses of the purified biosurfactant by chemical methods, Fourier transform infrared spectroscopy, and nuclear magnetic resonance suggested that it is a glycolipid-type biosurfactant, and it showed no cytotoxicity in the MTT assay. The biosurfactant, submitted to different formulation methods as a commercial additive, remained stable for 120 days at room temperature. Tensioactive properties and stability were evaluated at different pH values, temperatures, and salt concentrations. The biosurfactant obtained with all formulation methods demonstrated good stability, with tolerance to wide ranges of pH, temperature and salinity, enabling application under extreme environmental conditions. Bioremediation tests were performed to check the efficacy of the isolated biosurfactant and the selected microbial species in removing oil from soil. The results demonstrated that the biosurfactant produced has promising properties as an agent for the bioremediation of contaminated soil.

Manganese Oxide Photodeposited onto Titanium Dioxide as a New Environmental Catalyst

2005 ◽  
Vol 480-481 ◽  
pp. 117-122 ◽  
Author(s):  
Ayumu Tateoka ◽  
Yoshika Sekine ◽  
Takamasa Tsuda ◽  
Takanobu Ohashi
Keyword(s):  
Carbon Dioxide ◽  
Titanium Dioxide ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Room Temperature ◽  
Complex Oxide ◽  
Environmental Catalysis ◽  
Environmental Catalyst ◽  
Formaldehyde In Air

Authors have successfully synthesized a new environmental catalysis which reacted with harmful formaldehyde in air at room temperature. Although manganese oxide is practically used for a major ingredient of formaldehyde removing materials, intermediates such as formate formed on the surface reduced the removal efficiency. Then, manganese oxide was photodeposited onto the surface of titanium dioxide particles which could decompose certain organic compounds with UV irradiation. It was confirmed that the complex oxide decomposed formaldehyde into carbon dioxide at room temperature. Moreover, UV irradiation enhanced the production of the carbon dioxide.

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