Effects of UV absorbers and reducing agents on light fastness of cotton fabrics pre-dyed with sodium copper chlorophyllin and gardenia yellow

2020 ◽  
Vol 90 (19-20) ◽  
pp. 2245-2257
Author(s):  
Zhong Zhao ◽  
Mingwen Zhang ◽  
Chris Hurren ◽  
Liming Zhou ◽  
Jihong Wu ◽  
...  
Keyword(s):  
Sodium Citrate ◽  
Cotton Fabrics ◽  
Reducing Agents ◽  
Simulated Sunlight ◽  
Light Fastness ◽  
Sunlight Irradiation ◽  
Uv Absorbers ◽  
Dyed Fabrics ◽  
Sodium Copper Chlorophyllin ◽  
Inorganic And Organic

In this study, inorganic and organic UV absorbers, as well as reducing agents, were employed to treat cotton fabrics that were pre-dyed with two natural dyes (sodium copper chlorophyllin and gardenia yellow) to improve light fastness. The performance of UV absorbers and reducing agents was evaluated by comparing ΔE (CIELAB) of the treated samples caused by their exposure to simulated sunlight irradiation. Results show that both inorganic and organic UV absorbers present unsatisfactory effects on inhibiting the photo-fading of dyes, while the reducing agents (i.e. sodium citrate and glucose) exhibit distinctive effects on improving their light fastness. The protection was enhanced when the amount of the two reducing agents was increased from 1% to 5% o.w.f. Sodium citrate was found to be more efficient than glucose in this regard. Change in shade of gardenia yellow and sodium copper chlorophyllin pre-dyed fabrics with a treatment of 5% o.w.f. sodium citrate after 10 h exposure to simulated sunlight were ΔE 3.95 and 2.46, while for the controls were ΔE 10.34 and 8.11, respectively.

scholarly journals Dyed fabrics modified via assembly with phytic acid/berberine for antibacterial, UV resistance, and self-cleaning applications

2019 ◽  
Vol 14 ◽  
pp. 155892501988897
Author(s):  
Jiaojiao Liu ◽  
Xinghuan Lin ◽  
Hui’e Liang
Keyword(s):  
Phytic Acid ◽  
Uv Light ◽  
Cotton Fabrics ◽  
Uv Resistance ◽  
Light Fastness ◽  
Bacterial Reduction ◽  
Berberine Hydrochloride ◽  
Self Cleaning ◽  
Dyed Fabrics ◽  
Fabric Surface

There is a growing demand for dyed cotton fabrics for antibacterial and UV-resistant materials application. Here, we use titanium dioxide (TiO2) to improve the UV resistance and impart self-cleaning property to cotton fabrics. Besides, to produce antibacterial dyed fabrics, berberine hydrochloride is used as a dye and antibacterial agent. Phytic acid and berberine hydrochloride are coated onto the fabrics via self-assembly to improve the light fastness. Scanning electron microscopy and Fourier-transform infrared spectroscopy tests show that TiO2 nanoparticles are grafted onto fabrics, and phytic acid (–) and berberine hydrochloride (+) are successfully assembled onto the fabric surface. The treated fabrics exhibit excellent UV light fastness and good self-cleaning property. Most importantly, the obtained cotton fabrics illustrate remarkable antimicrobial activity against Staphylococcus aureus and Escherichia coli O157:H7 with 97.63% and 84.52% bacterial reduction within 60 min of contact time, respectively. Therefore, our designed dyed antibacterial fabrics may have great potential for use in textiles.

scholarly journals Psuderanthimum reticulatum: A New Green Source for Dyeing of Cotton Fabric

2020 ◽  
Vol 32 (10) ◽  
pp. 2583-2588
Author(s):  
S. Margrat Sheela ◽  
J. Rosaline Vimala ◽  
M. Stella Bharathy ◽  
A. Agila ◽  
S. Sharmila ◽  
...  
Keyword(s):  
Aqueous Extract ◽  
Copper Sulphate ◽  
Stannous Chloride ◽  
Ferrous Sulphate ◽  
Cotton Fabrics ◽  
Fastness Properties ◽  
Anthocyanin Pigment ◽  
Light Fastness ◽  
Chemical Test ◽  
Dyed Fabrics

In the present work, cotton fabrics were dyed using the acidified aqueous extract of Psuderanthimum reticulatum leaves with different mordants such as ferrous sulphate, stannous chloride, copper sulphate, potash alum and ferric alum by premordanting technique and various shades were obtained. The washing, perspiration and light fastness properties of the dyed fabrics were carried out by standard methods, ISO 105-C06 A2S-2010, ISO 105 E04-2013 and ISO 105 B02 Methods 3:2014, respectively. Cotton fabrics dyed with copper sulphate and ferric alum showed excellent to very good properties towards the entire fastness tests studied. The bioactive colourant present in the aqueous extract of Psuderanthimum reticulatum responsible for dyeing is anthocyanin pigment and it was identified by chemical test, UV & FTIR spectral and HPLC analysis.

Preparation of La2Ti2O7/TiO2/Fe3O4 for effective persulfate activation under simulated sunlight irradiation

2021 ◽  
Vol 297 ◽  
pp. 121983
Author(s):  
Haiyu Xu ◽  
Lei Wang ◽  
Xiaolei Ma ◽  
Yan Meng ◽  
Jingwei Huang ◽  
...  
Keyword(s):  
Simulated Sunlight ◽  
Sunlight Irradiation ◽  
Persulfate Activation

New insights into the facilitated dissolution and sulfidation of silver nanoparticles under simulated sunlight irradiation in aquatic environments by extracellular polymeric substances

2021 ◽  
Author(s):  
Yi Yang ◽  
Shimei Zheng ◽  
Ruixuan Li ◽  
Xin Chen ◽  
Kunkun Wang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Extracellular Polymeric Substances ◽  
Aquatic Environments ◽  
Simulated Sunlight ◽  
Sunlight Irradiation

Impacts of extracellular polymeric substances on the dissolution and sulfidation of silver nanoparticles in aquatic environments.

Crystal and electronic structures, and photoluminescence and photocatalytic properties of α-EuZrS3

2016 ◽  
Vol 40 (12) ◽  
pp. 10219-10226 ◽  
Author(s):  
Sheng-Ping Guo ◽  
Yang Chi ◽  
Jian-Ping Zou ◽  
Huai-Guo Xue
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Electronic Structures ◽  
Photocatalytic Properties ◽  
Simulated Sunlight ◽  
Sunlight Irradiation

Novel crystalline α-EuZrS3 shows Eu2+ photoluminescence and is photocatalytically active towards the decomposition of methylene blue under visible light or simulated sunlight irradiation.

scholarly journals Synergy of the Combination of Titanate Nanotubes with Titania Nanoparticles for the Photocatalytic Hydrogen Generation from Water-Methanol Mixture Using Simulated Sunlight

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Marco Serra ◽  
Hermenegildo Garcia
Keyword(s):  
Hydrogen Generation ◽  
Titanium Dioxide Nanoparticles ◽  
Titanate Nanotubes ◽  
Titania Nanoparticles ◽  
Simulated Sunlight ◽  
Visible Absorption ◽  
Sunlight Irradiation ◽  
Photocatalytic Hydrogen Generation ◽  
Commercial Titanium ◽  
Alkali Digestion

Alkali digestion of titanium nanoparticles leads, after neutralization, to the formation of titanate nanotubes with long aspect ratio. One salient change in the formation of titanate nanotubes is the observation of an extended visible absorption band up to 550 nm, responsible for their brown colour. Combination of titanate nanotubes with commercial titanium dioxide nanoparticles, either Evonik P25 or Millennium PC500, results in an enhanced photocatalytic activity for hydrogen generation from water-methanol mixtures. This synergy between the two titanium semiconductors has an optimum for a certain proportion of the two components and is observed in both the absence and the presence of platinum or gold nanoparticles. The best efficiency under simulated sunlight irradiation was for a combination of 12 wt.% titanate nanotubes containing 0.32 wt.% platinum in 88 wt.% Millennium PC500, where a two-time increase in the hydrogen generation is observed versus the activity of Millennium PC500 containing platinum. This synergy is proposed to derive from the interfacial electron transfer from titanate nanotubes undergoing photoexcitation at wavelengths in which Millennium PC500 does not absorb this form of titania nanoparticles. Our results illustrate how the combination of several titanium semiconductors can result in an enhancement efficiency with respect to their individual components.

Synthesis, Application and Antimicrobial activity of New Acid Dyes based on 3-Amino-2-thioxo-4-thiazolidinone nucleus on Wool and Silk fabrics

2021 ◽  
Vol 18 ◽  
Author(s):  
Fatma A. Mohamed ◽  
Shaban Elkhabiry ◽  
Ismail A. Ismail ◽  
Attia O. Attia
Keyword(s):  
Antimicrobial Activity ◽  
Fastness Properties ◽  
Acid Dyes ◽  
Light Fastness ◽  
Gram Positive ◽  
Gram Negative ◽  
Wool Fabrics ◽  
Infra Red ◽  
Dyed Fabrics ◽  
Silk Fabrics

: The dyes are synthesized by 3-Amino-2-thioxo-4thiazolidinone (N-Amino rhodanine) with glutaraldehyde or Terephthalaldehyde by 2:1 mole to form a and b then coupled with diazonium salts p-Amino benzenesulfonic acid and 4-Amino 3,4 disulfoazobenzeneazobenzene by 2:1 to form new different bis monoazo a1, b1 and diazo a2 and b2 acid dyes. Therefore, the synthesized dyes were applied to both silk and wool fabric materials. We also evaluated the antimicrobial activity for these dyed fabrics against two model gram-negative and gram-positive bacteria. Further, the chemical composition of these dyes is emphasized by elemental analysis Aims: This paper aims to synthesize, apply dye and antimicrobial to four new acid dyes based on derivatives of N-Amino rodanine as a chromophoric group. These dyes are used in dyeing silk and wool with the good lightfastness and are also excellent for washing, rubbing, and sweating fastness. Also, we measure antimicrobial activity for silk and wool fabrics toward Gram-negative, Gram-positive. Background: The search for a synthesis of new acid dyes has antimicrobial for gram-negative and gram-positive. These dyes are mainly used on silk and wool fabrics which have excellent for light fastness, washing, rubbing, and sweating fastness. Objective: The present studies were aimed at synthesis, characterization and antimicrobial toward gram- negative and gram-positive. Methods: The infra-red spectrum was recorded using an Infra-red spectrometer, Perkin Elmer/1650 FT-IR. The 1H-NMR spectra were recorded using a Varian 400MHz spectrometer. The absorbance of the dyes was measured in the ultraviolet-visible region between 300 and 700 nm by a UNICAM UV spectrophotometer. The dye uptake by wool and silk fabrics was measured using a Shimadzu UV-2401PC (UV/V is spectrophotometer at λmax) before and after dyeing. The produced dyes were found to have good antimicrobial activity against a variety of bacteria. Results and Discussion: The compounds a1, b1, a2 &b2 shows good antimicrobial activity toward gram-negative (E. coli), gram-positive (S. aurous). The data showed that exhaustion and the fastness properties of silk and wool dyed fabrics were both very high. Conclusion: This work prepares newly synthesized acid dyes based on 3-Amino-2-thioxo-4thiazolidinone derivatives and uses them for dyeing wool and silk fabrics. Both synthetic dyes have good light fastness and fastness properties. Also, all dyes have a good antimicrobial effect.

The Tetrakis(trimethylphosphine)cobalt Anion

1977 ◽  
Vol 32 (2) ◽  
pp. 138-143 ◽  
Author(s):  
Reinhard Hammer ◽  
Hans-Friedrich Klein
Keyword(s):  
Solid State ◽  
Alkali Metals ◽  
Reducing Agents ◽  
Phosphine Ligands ◽  
Organic Halides ◽  
Oxidative Additions ◽  
Reversible Formation ◽  
Inorganic And Organic

Reduction of paramagnetic L4Co (L = (CH3)3P) (d9) by alkali metals affords salts of L4Co- (d10). These are strong reducing agents, powerful bases and very able nucleophiles. They rapidly exchange three of their phosphine ligands for CO. Their reactions with a variety of inorganic and organic halides are shown to be effectively oxidative additions. From the distinct thermochromic behaviour of these salts both in the solid state and in solution a reversible formation involving different states of solvation is deduced.

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