Effect of dye bath pH on dyeing and functional properties of wool fabric dyed with tea extract

Ren, Yanfei; Gong, Jixian; Wang, Fubang; Li, Zheng; Zhang, Jianfei; Fu, Ranran; Lou, Jiangfei

doi:10.1016/j.dyepig.2016.07.032

Cited by 73 publications

(37 citation statements)

References 15 publications

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“…The FT‐IR spectrum consists of two regions namely functional and fingerprint. The functional region where many stretching frequencies appear is between 4000 and 1500 cm −1 , and the fingerprint region is below 1500 cm −1 and has many peaks that are difficult to assign . In Figure , the broad absorption at the wavenumber range 3580 to 3200 cm −1 arises because of stretching hydrogen bonds ascribed to the hydroxyl group (O─H) vibration of dye .…”

Section: Resultsmentioning

confidence: 99%

“…The functional region where many stretching frequencies appear is between 4000 and 1500 cm −1 , and the fingerprint region is below 1500 cm −1 and has many peaks that are difficult to assign. [28][29][30][31][32] In Figure 2, the broad absorption at the wavenumber range 3580 to 3200 cm −1 arises because of stretching hydrogen bonds ascribed to the hydroxyl group (O─H) vibration of dye. [33][34][35] The signals in the range 2950 to 2850 cm −1 are related to the stretching vibrations of ─CH, ─CH 2 , and ─CH 3 .…”

Section: Ft-ir Measurementsmentioning

confidence: 99%

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St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

et al. 2019

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Summary Natural dyes extracted from fruits, vegetables, flowers, and leaves are considered as promising alternative sensitizers to replace synthetic dyes for dye‐sensitized solar cells (DSSCs). Generally, solar activity of natural dyes stem from anthocyanin pigment. Carbonyl, carboxyl, and hydroxyl groups present in the anthocyanin molecule improve the adsorption ability of dye on TiO2 and therefore facilitate charge transfer. Here, for the first time, novel natural dyes extracted from St. Lucie cherry, yellow jasmine, and madder berries are reported to act as sensitizer in DSSCs. These novel natural dye extracts are prepared by dissolving related fruits in ethanol. The ingredient of the dyes is identified by FT‐IR spectroscopy. Accordingly, FT‐IR spectrum reveals that novel natural dye extracts exhibit all the characteristic peaks of anthocyanin pigment. Specifically, St. Lucie cherry consists of more distinct carbonyl group than other sources. Also, photoanodes composed of three TiO2 layers are prepared by using a spin‐coating method. Then, they are immersed into natural dyes and analyzed by conducting UV‐Vis spectroscopy. Compared with bare TiO2, natural dye–loaded photoanodes demonstrate far higher absorption ability in the visible region. After fabrication of devices with different novel natural dye sensitizers, current‐voltage characteristics and electrochemical impedance spectroscopy measurements are performed. The best power conversion efficiency (PCE) of 0.19% is obtained by sensitization of St. Lucie cherry with an open‐circuit voltage (Voc) of 0.56 V, short‐circuit current density (Jsc) of 181 μA cm−2, and fill factor (FF) of 0.55. Furthermore, St. Lucie cherry–sensitized devices show the lowest charge transfer and highest recombination resistances. This result can be attributed to the obvious carbonyl group exhibited by St. Lucie cherry.

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Section: Resultsmentioning

confidence: 99%

Section: Ft-ir Measurementsmentioning

confidence: 99%

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

et al. 2019

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“…Thus indigo dyeing of synthetic fibres should be the first process to be resolved. However, to date only indigo is used to dye natural fibres such as cotton, wool and latex . There are few reports of the application of indigo for dyeing synthetic fibres …”

Section: Introductionmentioning

confidence: 99%

“…However, to date only indigo is used to dye natural fibres such as cotton, wool and latex. [17][18][19][20] There are few reports of the application of indigo for dyeing synthetic fibres. [21][22][23] There are many polar groups in the molecular structure of nylon, which is thus fit to be dyed by multiple dyestuffs.…”

Section: Introductionmentioning

confidence: 99%

Energy‐efficient dyeing of nylon 6 using indigo powder dyestuff after atmospheric plasma treatment at ambient pressure

Fei

2019

Coloration Technology

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Nylon 6 was treated with a dielectric barrier discharge, i.e. atmospheric plasma at ordinary air pressure. Factors influencing the dyeing process of nylon 6 using indigo blue powder were studied. The mechanism and effect of this dyeing technology were compared with those of conventional technology. Dyeing after plasma treatment at 30–50 °C can produce high dye uptake in a short time. Notably, dyeing after plasma treatment is beneficial for energy conservation. However, at 60–70 °C, the K/S values of plasma‐treatment dyeing sharply increased over a short time, after which they remained largely unchanged. This finding indicated that the dyeing mechanism changed. The speed constant of dyeing after plasma treatment is 2.8 times that of conventional dyeing. The K/S values of dyeing samples after plasma treatment approached the dyeing saturation K/S value in a short time; therefore, this method of dyeing after plasma treatment achieves energy conservation and efficiency in a brief period of time. Conversely, conventional dyeing is more effective at high temperatures but consumes more energy. The adaptive electro‐discharge condition is achieved under the treatment conditions of 375 W for 2 min. The chromatic aberration of the dyed samples after plasma treatment is smaller than that of conventional dyeing at 50 °C for 75 min.

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“…Tea polyphenol could be oxidized to quinone intermediates under high temperature or alkaline conditions, which would be transformed into theaflavin promptly on the grounds that quinone intermediates are unstable [ 18 ], and theabrownin would be generated via a non-enzymatic browning reaction between theaflavin and amino acid. Addition of exogenous additives not only could enhance the content of tea pigments, but also endow a pleasant aroma to dyed fabrics, which could achieve the processing simultaneously by both dyeing and finishing accordingly [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Eco-dyeing with biocolourant based on natural compounds

et al. 2018

Self Cite

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Biomass pigments have been regarded as promising alternatives to conventional synthetic dyestuffs for the development of sustainable and clean dyeing. This investigation focused on in situ dyeing of fabrics with biopigments derived from tea polyphenols via non-enzymatic browning reaction. The average particle size of dyed residual liquor with natural tea polyphenol was 717.0 nm (ranging from 615.5 to 811.2 nm), and the Integ value of dyed wool fabrics was the greatest compared to those of counterparts. In addition, the Integ values of dyed fabrics with residual liquor were much bigger than those with the first reaction solutions when dyed by identical dyeing liquor. As a result, the dyeing process could be carried out many times because the concentration of the residual liquor was relatively superior. All dyed fabrics acquired admirable rubbing as well as washing fastness, and the relevant dyeing mechanism has been analysed in the paper.

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Effect of dye bath pH on dyeing and functional properties of wool fabric dyed with tea extract

Cited by 73 publications

References 15 publications

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

St. Lucie cherry, yellow jasmine, and madder berries as novel natural sensitizers for dye‐sensitized solar cells

Energy‐efficient dyeing of nylon 6 using indigo powder dyestuff after atmospheric plasma treatment at ambient pressure

Eco-dyeing with biocolourant based on natural compounds

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