• Title/Summary/Keyword: industrial dyes

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Elimination of COD and Color of Dye by UV/H2O2, UV/TiO2 System (UV/H2O2, UV/TiO2 시스템에서 염료의 색도 및 COD 제거)

  • Kim, Kei-Woul;Park, Joung Mi;Sim, Su-Jin;Yee, Hi-Joung;Rhee, Dong Seok
    • Journal of Industrial Technology
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    • v.20 no.A
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    • pp.51-56
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    • 2000
  • The Photocatalytic decolorization and degradation of commercial dyes were studied using a batch reactor. Degussa P25 titanium dioxide and $H_2O_2$ were used as the photocatalyst and proved to be effective for dyes degradation when they were irradiated with UV light. The light source was a 20W low pressure mercury lamp. Three different kinds of dyes, such as direct dye(congo red), acid dye (acid black) and disperse dye(disperse blue) were tested. Extending the UV only treatment up to 120min, direct dye was decolorized to 60% and degraded to 30% as COD. On the other side, acid and disperse dyes were eliminated less than 10% as color and COD. But, color and COD were eliminated about 90% for all of the three dyes by $UV/H_2O_2$ system. And then the most effective decolorization was done for direct dye with 96% removal efficiency by $UV/TiO_2$ system at 120min with 500mg/L of $TiO_2$.

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Competitive Adsorption of Two Basic Dyes RB5 and GB4 on a Local Clay (점토에 대한 2개 염기성 염료 RB5와 GB4의 경쟁 흡착)

  • Elaziouti, A.;Derriche, Z.;Bouberka, Z.;Laouedj, N.
    • Journal of the Korean Chemical Society
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    • v.54 no.1
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    • pp.110-114
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    • 2010
  • The equilibrium of adsorption of basics dyes RB 5 and BG 4 from a single dyes in the mixtures on the sodium-exchanged clay of the Maghnia (Algeria) was studied. The maximum adsorption capacities of BR5 and BG4 in single dyes were 465.13 and 469.90 mg/g respectively. In the simultaneous adsorption of BR5 and BG4 from mixture solutions, three different initials concentrations ratios R (R=$C_{(BR5)}/C_{(BG4)}$) were tested: 2.5/1, 1/1 and 1/2.5 using ADMI method. The isotherms adsorptions of dyes from the mixtures are characteristics of competition phenomenon. A very strong interaction between BR5 and BG4 for the active sites of adsorption of surface of clay is obtained for R = 1/1. The ratio R' (R'=$Qe_{(mixture)}/Qe_{(single)}$) of the adsorption capacity of BR5 and BG4 in the mixture were reduced by factor of 0.86, 0.74 and 0.84 for the initials concentrations ratios R (R=$C_{(BR5)}/C_{(BG4)}$) of 2.5/1, 1/1 and 1/2.5 respectively. The variation of the ratio of the adsorption capacity R‘ of BR5 and BG4 in the mixture solutions with initial concentration ratios R indicates that BR5 dye is slightly favourable in the competition adsorption than BG4. Langmuir and Freundlich models fit very well with adsorption behaviour of single dyes as well as the dyes in mixture solutions.

Relation between Chemical Structure of Yellow Disperse Dyes and Their Lightfastness

  • Kim, Sung-Dong;Park, Eun-Jin
    • Fibers and Polymers
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    • v.2 no.3
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    • pp.159-163
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    • 2001
  • Five yellow disperse dyes were synthesized and their dyeing, fastness and photodegradation behaviors were investigated. It was found that dyes derived from phenylindole and N-alkylaminobenzene showed dye uptake directly proportional to the dye concentration, but the build-up of dyes derived from carbazole and pyridone were not good. The wavelength at maximum absorption. molar extinction coefficient. and the tendency to the photodegradation were strongly dependent on the electron donating ability of the coupling component. The dye, whose coupling component was phenylindole, possessed the excellent dyeing properties and the high degree of lightfastness. UVA had an effect on the inhibition of the photodegradation especially for the easily photodegradabte dyes.

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Monitoring of phase separation between silk fibroin and sericin using various dye system

  • Kwak, Hyo Won;Lee, Ki Hoon
    • International Journal of Industrial Entomology and Biomaterials
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    • v.30 no.1
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    • pp.1-5
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    • 2015
  • Understanding the interactions between fibroin and sericin is crucial in solving the mechanism of silk spinning. In this study, various commercially available dyes were used to monitor the interface between fibroin and sericin during the gelation of fibroin. The phase separation between fibroin and sericin could be observed by the addition of azo dyes over a certain molecular weight. Furthermore, the addition of the dyes to the sericin layer showed vivid phase separation over addition to the fibroin layer.

Reactive dyeing systems for wool fibres based on hetero-bifunctional reactive dyes

  • Jeong, Jo-Ho;D. M. Lewis
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2003.04a
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    • pp.37-42
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    • 2003
  • Although fibre reactive dyes for wool were developed before those for cellulosic fibres, there are still limited ranges of fibre reactive dyes available for wool compared to those for cellulosic fbres. Since Fujioka and Abeta introduced the first mixed bifunctional reactive system in the early 1980s for cellulosic fibres, there has been some works on cotton and on silk. (omitted)

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Dyeing of high Light Fastness Solvent Dyes on Polyester Fiber (고 일광견뢰도 Solvent 염료의 폴리에스터 염색에 관한 연구)

  • 최재홍
    • Textile Coloration and Finishing
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    • v.15 no.3
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    • pp.176-184
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    • 2003
  • This research aimed at scrutinizing the dyeability of some solvent dyes on polyester and their light fastness to be exploited as a breakthrough in light fastness where utmost fastness is required such as ultramicrofibers and industrial markets. Dyeability on polyester was mainly evaluated by HT exhaust dyeing according to the general procedure. Light fastness has been tested by a preliminary UV test followed by HT xenon test in compliance with standard SAE J1885, 224 KJ. Fading has been determined quantitatively by evaluating the shade deviation and the strength difference between unexposed and exposed samples by means of CIELab values.

Study on the Development of Practical Application of Indigo Dyes (실용화를 위한 쪽 염료의 관한 연구)

  • Lee, Sang-Phil;Kim, Soon-Hee
    • The Research Journal of the Costume Culture
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    • v.19 no.3
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    • pp.612-621
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    • 2011
  • The process of making or cultivating indigo dyes is very cumbersome and complex. The dye extraction and dyeing methods using general plant dye, moth repellent dye, fast acting natural dye, and other dyes are very different. This research investigates the extraction of indigo dye and liquid dye extraction of polygonum(indigo) plants using calcium oxide water. While extracting indigo dye the concentration of purified indigo dye may be controlled by adjusting the pH level. Due to the various uses of dyes the adjustment of surface color must be considered. In regard to the change according to different concentrations of reducing agents, it was found that cotton fabrics and ramie fabrics show the highest color difference at 0.4% and 0.3% respectively. As the reduction temperature increases, the color difference increases as well. The maximum color difference was found to appear at $90^{\circ}C$. Cotton fabrics and ramie fabrics showed 70.55 and 67.01 respectively. The color difference increases as the concentration of dyes increases, but at a concentration of 300%, cotton fabrics was found to show 6.22PB in H value using the Munsell color system, containing purple and blue color. The pH of the polygonum dyes extracted through this experiment were adjusted by adding calcium oxide to the experimental water, without directly adding calcium oxide to the liquid polygonum extract. In a refine state, it was mixed with polygonum extract to extract a more refine and highly concentrated indigo dye. When lye and reducing agents are added to extracted indigo dye and sealed for long-term storage, it can be effective and easily used for dyeing.

A Study on the Decolorization of Reactive Dyes by Using Ozone Treatment (오존에 의한 반응성 염료의 탈색에 관한 연구)

  • Lee, Mun-Soo
    • The Journal of Natural Sciences
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    • v.9 no.1
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    • pp.9-17
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    • 1997
  • We studied on the decoloring efficiency of a dying and finishing industrial wastewater containing reactive dyes in the ozone treatment system. The wastewater containing reactive dyes improved the decolorization by the ozone oxidation. In order to determine the optical conditions for ozonation, various operation factors such as initial wastewater concentrations, pH, temperature, and ozone dose were evaluated. Ozone utilization rate was improved in general with the increase of initial concentration of wastewater. And the decolorization speed or reactive dyes was more decreased in deep color of blue series than in light color such as yellow series. The colorization of wastewater containing reactive dyes was changed step through midle color depending upon increasing of ozone treated time. The efficiency of decolorization for wastewater was improved with the pH increased and the temperature of ozone treatment system decreased.

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The Characteristic of Natural Dyeing with Mulberry Leaf and Coffee Powder using Zinc Mordant (아연 매염제를 이용한 뽕잎, 커피 천연염재의 염색특성)

  • Lee, Jonggwan;Ko, Jaehoon
    • Textile Coloration and Finishing
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    • v.28 no.2
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    • pp.118-123
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    • 2016
  • The use of natural organic dyes obtained from renewable resources such as plants and trees has the potential for not only preserving petrochemicals but also all-endangered environment for coming next generations. In spite of inferior fastness, natural dyes can be employed in the colouration of natural as well as synthetic fibers. Recently, the potentiality of using natural dyes in colouration with additional UV-protection and antimicrobial properties has been reported. This study is aimed to investigate the effect of Zinc compounds compared to another metallic compounds as mordants on the dyeing properties of natural dye extracted from mulberry leaves and coffee. In this study, the results showed Zinc compounds was expose that is more similar than other mordants in washing fastness through a repeated experiment. Also, Zinc is the environmental impact is less material compared with other mordants, essential edibility minerals ingredient that is necessary in human body.

A Preliminary Study on Natural Dyeing by the Delphi Method (Part III) -Developing Valuation of Natural Dyes- (델파이법을 이용한 천연염색에 관한 기초 연구 (제3보) -천연염료의 개발가치 평가-)

  • You Myung-Nim;Roh Eui-Kyung
    • Journal of the Korean Society of Clothing and Textiles
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    • v.30 no.5 s.153
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    • pp.733-741
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    • 2006
  • This study was to investigate categories of valuation and make the standard on developing valuation of natural dyes by Delphi method. The three-round Delphi tests were performed with 36 professional in the academic, the industrial, and the art field.'Dyeability property' meant levelling, adsorption, color diversity with mordant, color stability, 'marketability', possibility of mass production, economical efficiency, functionality, demand and supply of natural dyes, 'color', yield, beautiful color, value of color and 'color fastness', washing, perspiration and light fastness. Indigo, persimmon, cochineal, safflower and onion in dyeability property were evaluated highly, functional natural dyes in marketability, red and purple color ones except indigo in color and ones containing tannin in color fastness.