Simple and economic bleaching process for cotton fabric

Abdel-Halim, E.S.

doi:10.1016/j.carbpol.2012.01.082

Cited by 55 publications

(31 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The strength of the crystal is due to Van der Waals and hydrogen bonds. Waxes and pectins are responsible for the hydrophobic properties of raw cotton, while its yellowish and brownish coloration is associated with the presence of remnants of proteins and flavone pigments (Abdel-Halim, 2012;Kabir et al, 2014). Therefore, it is necessary to purify cotton fibers before bleaching, finishing, and using them (Iqbal et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, fluorescent bleaching agents (FBs) that absorb the invisible long-wavelength ultraviolet light (λ=300-400 nm) and emit visible light in the wavelength range of 400 to 500 nm (blue part of the light spectrum) are used. Removal of blue-absorbing yellow impurities is the main goal of dyeing, not cleaning (Abdel-Halim, 2012;Kabir et al, 2014). Whether it is a bio-or chemical-bleaching, the process should be conducted with minimum damage to fiber.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Miljković

Trajković

et al. 2020

Facta Univ Phys Chem Technol

View full text Add to dashboard Cite

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%.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Miljković

Trajković

et al. 2020

Facta Univ Phys Chem Technol

View full text Add to dashboard Cite

show abstract

“…In addition to those mentioned above, resins, pigments, and hemicellulose also exists in greige cotton fabric [ 9 , 10 , 11 ]. The yellowish or brown coloration of the cotton fibers is related to the protoplasmic residues of protein and the flavones pigments of cotton flowers [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Combinative Scouring, Bleaching, and Cationization Pretreatment of Greige Knitted Cotton Fabrics for Facilely Achieving Salt-Free Reactive Dyeing

Shen

Xiang

et al. 2017

Molecules

View full text Add to dashboard Cite

In order to facilely achieve pretreatment and salt-free dyeing of greige knitted cotton fabrics, a combinative scouring, bleaching, and cationization pretreatment of the fabrics is designed in this study. The fabrics are first treated in a bath containing commercial scouring and bleaching agents, and then glycidyltrimethylammonium chloride (GTA) is directly added into the bath to achieve cationization of the fabrics. Utilization of the alkaline and high-temperature conditions in scouring and bleaching process, cationization can facilely proceed in a short time. Optimal pretreatment conditions are as follows: greige knitted cotton fabrics are treated in a bath containing 4 g/L scouring agent and 6 g/L 30% hydrogen peroxide at 90 °C for 60 min, and then 30 g/L GTA and 3 g/L sodium hydroxide are added in the bath for another 15 min treatment. Fiber performances, including whiteness, water absorptivity, diffusion time, and capillary effect, are tested and evaluated. X-ray diffraction analysis, surface morphology, and thermal analysis of the pretreated cotton are also investigated and compared with that treated only with scouring and bleaching agents. Much higher dye fixation and color yield could be realized on the pretreated cotton in salt-free reactive dyeing. Colorimetric properties of the dyes are studied and good colorfastness of the dyes on the cationic fabrics are obtained. All of the above results show promising prospects of this combinative pretreatment in real application.

show abstract

“…The purpose of cotton bleaching is to decolorize natural pigments, mainly flavonoids conferring a pure white appearance to the fibres [1,2]. This process is directly related to the success of the subsequent wet processing operations such as dyeing, printing and finishing [3].…”

Section: Introductionmentioning

confidence: 99%

“…This process is directly related to the success of the subsequent wet processing operations such as dyeing, printing and finishing [3]. Nowadays hydrogen peroxide, due to its biodegradability, almost entirely replaced the conventional chlorine oxidizing chemicals [1]. It is applied at alkaline pH and temperatures closed to boiling, requiring therefore high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic pilot-scale reactor for enzymatic bleaching of cotton fabrics

Gonçalves

Herrero-Yniesta

Arce

et al. 2014

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

The potential of ultrasound-assisted technology has been demonstrated by several laboratory scale studies. However, their successful industrial scaling-up is still a challenge due to the limited pilot and commercial sonochemical reactors. In this work, a pilot reactor for laccase-hydrogen peroxide cotton bleaching assisted by ultrasound was scaled-up. For this purpose, an existing dyeing machine was transformed and adapted by including piezoelectric ultrasonic devices. Laboratory experiments demonstrated that both low frequency, high power (22 kHz, 2100 W) and high frequency, low power ultrasounds (850 kHz, 400 W) were required to achieve satisfactory results. Standard half (4 g/L H2O2 at 90 °C for 60 min) and optical (8 g/L H2O2 at 103 °C for 40 min) cotton bleaching processes were used as references. Two sequential stages were established for cotton bleaching: (1) laccase pretreatment assisted by high frequency ultrasound (850 kHz, 400 W) and (2) bleaching using high power ultrasound (22 kHz, 2100 W). When compared with conventional methods, combined laccase-hydrogen peroxide cotton bleaching with ultrasound energy improved the whitening effectiveness. Subsequently, less energy (temperature) and chemicals (hydrogen peroxide) were needed for cotton bleaching thus resulting in costs reduction. This technology allowed the combination of enzyme and hydrogen peroxide treatment in a continuous process. The developed pilot-scale reactor offers an enhancement of the cotton bleaching process with lower environmental impact as well as a better performance of further finishing operations.

show abstract

Simple and economic bleaching process for cotton fabric

Cited by 55 publications

References 32 publications

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

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

Combinative Scouring, Bleaching, and Cationization Pretreatment of Greige Knitted Cotton Fabrics for Facilely Achieving Salt-Free Reactive Dyeing

Ultrasonic pilot-scale reactor for enzymatic bleaching of cotton fabrics

Contact Info

Product

Resources

About