• Title/Summary/Keyword: azo dyes

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The Investigation on Color Change of Dis-azo Acid Dye in Wool Dyeing (양모섬유의 염색시 디스아조계 산성염료의 변색현상 규명)

  • 김미경;김태경;윤석한;임용진
    • Textile Coloration and Finishing
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    • v.15 no.2
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    • pp.86-92
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    • 2003
  • It is already known that the color of wool fabric dyed with disazo acid dyes could be changed in dyeing process and this is accelerated under alkaline condition. Focus was given to figuring out the mechanism of this color change, through the LC-MS analysis. In this study, no color change was seen in wool fabrics dyed with C. I. Acid Blue 113 under weak acidic, neutral and weak alkaline conditions for 1hour. However, the wool fabrics dyed under weak alkaline condition for a long time over 3 hours fumed reddish orange. When the wool fabrics dyed under weak acidic, neutral and weak alkaline conditions were treated with $0.5g/L\;Na_2C0_3$ solution, all of them turned reddish orange. On the other hand, the color of silk fabrics dyed with C. I. Acid Blue 113 were not changed after the same alkaline treatment. Wool contains cystine and cysteine, whereas silk does not. Due to the reversible reduction/oxidation process of cystine and cysteine in wool dyeing, the C. I. Acid Blue 113 of the dis-azo type is decomposed by reduction and consequently turned them into the reddish orange mono-azo types dye.

Potential Use of Probiotic Consortium Isolated from Kefir for Textile Azo Dye Decolorization

  • Ayed, Lamia;Zmantar, Tarek;Bayar, Sihem;Charef, Abdelkrim;Achour, Sami;Mansour, Hedi Ben;Mzoughi, Ridha El
    • Journal of Microbiology and Biotechnology
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    • v.29 no.10
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    • pp.1629-1635
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    • 2019
  • Azo dyes are recalcitrant pollutants, which are toxic, carcinogenic, mutagenic and teratogenic, that constitute a significant burden to the environment. The decolorization and the mineralization efficiency of Remazol Brillant Orange 3R (RBO 3R) was studied using a probiotic consortium (Lactobacillus acidophilus and Lactobacillus plantarum). Biodegradation of RBO 3R (750 ppm) was investigated under shaking condition in Mineral Salt Medium (MSM) solution at pH 11.5 and temperature $25^{\circ}C$. The bio-decolorization process was further confirmed by FTIR and UV-Vis analysis. Under optimal conditions, the bacterial consortium was able to decolorize the dye completely (>99%) within 12 h. The color removal was 99.37% at 750 ppm. Muliplex PCR technique was used to detect the Lactobacillus genes. Using phytotoxicity, cytotoxicity, mutagenicity and biototoxicity endpoints, toxicological studies of RBO 3R before and after biodegradation were examined. A toxicity assay signaled that biodegradation led to detoxification of RBO 3R dye.

Characterization of Diester functional-based Alkali-clearable Azo Disperse dyes (Diester계 치환기를 이용한 분산염료의 알칼리 영향성에 관한 연구)

  • Choe, Jong-Yun;Choe, Jae-Hong;Lee, Hyeon-Yeong;Gwon, O-Tak
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.10a
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    • pp.25-26
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    • 2008
  • 일반적인 분산염료, Phthalimide계 중간체로 사용한 분삼염료, Diester계 커플러만 이용한 분산염료와 비교한 Diester계 치환기를 이용한 분산 염료들은 R/C조건과 EtOAc와 증류수로 층분리하여 증류수층의 UV-Vis absorbance은 떨어지고 용해성은 증가한다. 그리고 Thiopene ring만 가진 염료와 비교한 염료들은 같은 파장에서의 UV-Vis absorbance은 떨어져 용해도는 증가하고 Thiopene ring과 Azo group의 분해에 의한 화합물 때문에 단파장에서의 UV-Vis absorbance가 크게 증가하여 염색 폐수의 색도를 감소시킬 수 있다.

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Green synthesis of aluminum-based metal organic framework for the removal of azo dye Acid Black 1 from aqueous media

  • Jung, Kyung-Won;Choi, Brian Hyun;Lee, Seon Yong;Ahn, Kyu-Hong;Lee, Young Jae
    • Journal of Industrial and Engineering Chemistry
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    • v.67
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    • pp.316-325
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    • 2018
  • Aluminum based metal-organic framework using a di-carboxylate linker succinic acid (Al-SA MOF), are synthesized in water with minimal generation of secondary pollutants. The physicochemical properties of Al-SA MOF were examined, followed by its utility for the adsorption of Acid Black 1 (AB1) in aqueous media. Influences of key parameters such as pH, contact time, initial AB1 concentration,temperature, and selectivity on the adsorption process were assessed. A series of adsorption mechanisms are proposed, which involve electrostatic, hydrogen bonding, and hydrophobic interactions. These findings suggest that Al-SA MOF is a potent candidate in removing complex azo dyes molecules from aqueous media.

Washing Fastness of Polyester Artificial Suede Fabric According to Reduction Clearing Method (환원세정방법에 따른 스웨드 직물의 세탁견뢰도)

  • 강연희;백진주;서말용;김삼수;허만우;이난형
    • Textile Coloration and Finishing
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    • v.13 no.4
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    • pp.234-240
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    • 2001
  • In order to improve the washing fastness of dyed polyester artificial suede fabric, it was dyed by using auto and anthraguinone type disperse dyes and treated with 3 different reduction clearing methods. The reduction clearing methods used in this study were normal alkaline reduction clearing, $N_2$ gas replacement method, and ultrasonic treatment during normal reduction clearing. The results were as followings ; The washing fastness property of dyed polyester artificial suede fabric was slightly improved by reduction clearing with $N_2$ gas replacement or with ultrasonic treatment comparing with normal alkaline reduction clearing. It was found that the use of $N_2$ gas replacement or ultrasonic treatment during reduction clearing eave effective removal of unfixed dyes on the fiber surface. We also obtained that the azo type disperse dye on polyester artificial fabric suede fabric showed higher wash fastness than anthraquinone type disperse dye.

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Synthesis of a Super Hydrophobic Violet Dye for Pure Polyolefin(PP/UHMWPE) Fibers (순수 폴리올레핀(PP/UHMWPE) 소재용 초소수성 보라색 염료의 합성)

  • Kim, Taekyeong;Lee, Changwhan
    • Textile Coloration and Finishing
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    • v.25 no.3
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    • pp.165-171
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    • 2013
  • A new monoazo violet dye optimized for polyolefin fibers such as polypropylene and ultra high molecular weight polyethylene fibers was synthesized and its dyeability was investigated. Two hexyl groups were introduced to coupler, 2,5-dimethoxyaniline, in order to increase hydrophobicity of the dye. The maximum absorption wavelength was appeared at 580nm, which meant that the dye showed violet color. From the dyeing results at various conditions, the optimum dyeing was determined as $130^{\circ}C$ for 1 hour with 5% owf of dyes. The good fastness ratings to washing, rubbing were obtained showing at least 4 for both fibers. Light fastness was acceptable for polypropylene fibers giving ratings 3~4. However, relatively poor light fastness was obtained in case of ultra high molecular weight polyethylene fibers showing ratings 2.

The Influence of Simple Electrolyte on the Behaviour of Some Acid Dyes in Aqueous Media

  • M. M. El-Fass;N. A. Badawy;A. A. El-Bayaa;N. S. Moursy
    • Bulletin of the Korean Chemical Society
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    • v.16 no.5
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    • pp.458-461
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    • 1995
  • The influence of adding counter-ion such as Na+ on the dimerization of the two sulphonated azo dyes, C.I. Acid Red 14 and C.I. Acid Red 17 in aqueous media has been studied spectrophotometrically. The observed hypochromic effect on increasing the amount of salt has been described. The dye concentration range where the dimerization equilibrium is applicable was chosen. No metachromatic behaviour was observed on changing the dye concentration and the amount of salt. This behaviour was attributed to the ability of the counter-ion to disrupt the structure of water as well as reducing the electrostatic repulsion forces between dye anions which will lead to the increase of aggregation tendency of the dye species.

Synthesis and Dyeing Properties of novel azo dyes derived from phthalimide (프탈이미드계 신규분산염료 합성 및 PET 섬유 염색 특성)

  • Lee, Hyeon-Yeong;Choe, Jae-Hong;Jeong, Won-Sik
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2008.04a
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    • pp.129-131
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    • 2008
  • 본 연구는 고 세탁견뢰도를 가지는 신규 Phthalimed계 염료를 합성하고, 일반 PET 섬유 및 해도형 PET에 염색하여 염색거동과 견뢰도 특성에 대해 알아보았다. 대부분의 염료는 4급 이상의 세탁견뢰도를 가지며, 몇 가지 염료는 90%이상의 염착률을 가진다.

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Dispersant-free dyeing of polyester with temporarily solubilised azo disperse dyes from pyridone derivatives (피리돈계 일시적 수용성 아조 분산염료를 이용한 폴리에스테르 섬유의 염색)

  • 이정진;한남근;이원재;최재홍;김재필
    • Proceedings of the Korean Fiber Society Conference
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    • 2002.04a
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    • pp.143-146
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    • 2002
  • 폴리에스테르를 염색할 수 있는 분산염료는 비수용성이기 때문에 염색시 염욕 내에서 응집, 결정화되는 현상을 방지하기 위하여 반드시 분산제를 첨가하여야 한다. 그러나 분산제를 사용하더라도 분산염료를 염욕 내에서 완전한 분산상태로 만들 수 없으며, 염색시 여러 원인에 의해 염료의 재응집 현상이 발생될 수 있을 뿐만 아니라 최근 거론되고 있는 환경문제로 인하여 분산제의 사용이 제한될 가능성도 있다. (중략)

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Green Synthesis of Nanoparticles Using Extract of Ecklonia Cava and Catalytic Activity for Synthetic Dyes

  • Kim, Beomjin;Song, Woo Chang;Park, Sun Young;Park, Geuntae
    • Journal of Environmental Science International
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    • v.29 no.12
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    • pp.1171-1184
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    • 2020
  • The green synthesis of inorganic nanoparticles (NPs) using biomaterials has garnered considerable attention in recent years because of its eco-friendly, non-toxic, simple, and low-cost nature. In this study, we synthesized NPs of noble metals, such as Ag and Au using an aqueous extract of a marine seaweed, Ecklonia cava. The formation of AgNPs and AuNPs was confirmed by the presence of surface plasmon resonance peaks in UV-Vis absorption spectra at approximately 430 and 530 nm, respectively. Various properties of the NPs were evaluated using characterization techniques, such as dynamic light scattering, transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction analysis. Phytochemicals in the seaweed extract, such as phlorotannins, acted as both reducing and stabilizing agents for the growth of the NPs. The green-synthesized AgNPs and AuNPs were found to exhibit high catalytic activity for the decomposition of organic dyes, including azo dyes, methylene blue, rhodamine B, and methyl orange.