• 한국염색가공학회지
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• 제16권2호
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• pp.34-40
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• 2004

This study was conducted to remove the reactive dyes by the Ozone demand flask method which are one of the main pollutants in dye wastewater, Ozone oxidation of three kinds of the reactive dyes was examined to investigate the reactivity of dyes with ozone, Trihalomethane formation potentials(THMFPs), competition reaction and ozone utilization on various conditions for single- and multi-solute dye solution. Concentration of dyes was decreased continuously with increasing ozone dosage in the single-solute dye solutions. THMFPs per unit dye concentration were gradually increased with increase of ozone dosage. By the result of THMFPs change with reaction time, THMFPs were rapidly decreased within 1 minute in single-solute dye solutions. Dey were increased after 1 minute of reaction time, and then they were consistently decreased again after longer reaction time. Competition quotient values were calculated to investigate the preferential oxidation of individual dyes in multi-solute dye solutions. Competition quotients$(CQ_i)$ and values of the overall utilization efficiency, no$_3$, were increased at 40mg/1 of ozone dosage in multi-solute dye solutions.

• 한국염색가공학회지
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• 제19권3호
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• pp.26-36
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• 2007

This study was carried out to treat the aqueous solutions containing reactive dyes(RB19, RR120 and RY179) by the Ozone demand flask method and adsorption process using activated carbon fiber(ACF) which are one of the main pollutants in dye wastewater. Ozone oxidation of three kinds of the reactive dyes was examined to investigate the reactivity of dyes with ozone, competition reaction and ozone utilization on various conditions for single- and multi-solute dye solution. Concentration of dyes was decreased continuously with increasing ozone dosage in the single-solute dye solutions. Competition quotient values were calculated to investigate the preferential oxidation of individual dyes in multi-solute dye solutions. Competition quotients(CQi) and values of the overall utilization efficiency, ${\eta}O_3$, were increased at 40mg/l of ozone dosage in multi-solute dye solutions. ACF(A-15) has much larger specific surface area$(1,584m^2/g-ACF)$ in comparison with granular activated carbon adsorbent (F400, $1,125m^2/g-GAC$), which is commonly used, and most of pores were found to be micropores with pore radius of 2nm and below. It was found that RB19 was most easily adsorbed among the dyes in this study. In the case of PCP (p-chlorophenol) and sucrose, which are single component adsorbate, adsorption capacities of ACF(A-15) were in good agreement with the batch adsorption measurement, and saturation time predicted of ACF columns for these components was also well agreed with practically measured time. But in the case of reactive dyes, which have relatively high molecular weight and aggregated with multi-components, adsorption capacities or saturation time predicted were not agreed with practically measured values.

• 한국염색가공학회지
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• 제17권6호
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• pp.11-19
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• 2005

Textile dyeing with vat dyes has the highest color fastness although one and the same dye of all vat dyes cannot always satisfy every color fastness requirement. So we examined cotton, nylon 6, and polyester fabrics dyed with vat dyes. Cotton, nylon 6 and polyester fabrics were dyed with vat dyes such as C. I. Vat Blue 1, Blue 19, Black 9, Green 1, Orange 2, and Violet 1 containing sodium hydrosulfite and NaOH. Oxidation were carried out by a sodium peroxoborate after dyeing. The dyed materials were soaped at the boil after oxidation. Especially hydrolysis and overreduction for dyed polyester with vats dyes containing -NHCO- and -NH- groups such as C. I. Vat Blue 6, Black 25, Black 27, Red 10, and Green 3 occurred. It seems that these phenomena are due to a high dyeing temperature. Wash and rubbing fastness of nylon are higher than that of cotton and polyester. Light fastness of cotton is higher than that of polyester and nylon.

• 대한환경공학회지
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• 제22권11호
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• pp.2077-2083
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• 2000

산업 현장에서 많이 사용되고 있는 반응성 염료인 remazol $black_5$를 연구 대상물로 선택하여 촉매습식 산화공법으로 처리하였다. 이때 반응성 염료성분의 분해효율, 촉매 첨가량 및 반응온도와 상호 관련하여 검토한 결과를 정리하였다. 이산화티탄 담체에 백금을 5.0wt% 담지한 촉매 1.5g/L, 6기압, $200^{\circ}C$ 이상에서 remazol $black_5$는 약 95% 이상 분해되었다. 반응온도 $250^{\circ}C$에서 240분 촉매산화를 하였을 때 uv 흡광 잔존율은 4%이고 반응온도가 $250^{\circ}C$, 120분 경과 후 색도 제거율은 약 95% 이상이었다.

• 한국인쇄학회지
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• 제12권1호
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• pp.117-132
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• 1994

New methodolgies for the syntheses of unsymmetrical squarylium(SQ) dyes for organic photoconductors(OPC) were developed and photostabilities for these dyes were dicucced. These dyes absorbed at 640-690nm and exhibit high molecular extinction coefficient about 10. photodegradation rate of these dyes is acceralated in the presence if singlet oxygen sensitizer. On the other hand, the photodegradation rate os retarded by adding effective singlet oxygen quencher, such as 2:1 metal dithiolate. It is suggested that the photodegration of unsymmetrical SQ dye may be due to a photo-oxidation involving singlet oxygen.

• Advances in environmental research
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• 제9권3호
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• pp.161-173
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• 2020

The removal of two dyes, namely Methylene Blue (MB) and Reactive Brillant Red (RR) from aqueous solution was investigated using magnetite iron coated pumice (MIP) composite in the Fenton-like oxidation process. A weight ratio of 2.5 g (with the molar ratio of Fe³⁺ to Fe²⁺ to be 2) (5%) of iron to the total pumice (50 g) was enabled during synthesis of catalyst. Surface composition and characteristics of the catalyst were assessed by SEM-EDX, FT-IR, Raman spectral analysis. The effect of the amount of pumice solely used or MIP, H₂O₂ concentration, pH and initial concentration of MB or RR dyes on Fenton-like process efficiency was investigated. EDAX spectrums of pumice and MIP showed that oxygen and silisium are the major elements. The Fe content of MIP increased to 2.24%. SEM, FT-IR and Raman spectrums confirmed the impregnation of Fe on pumice surface. The experimental results revealed that high removal rates of dyes could be obtained using MIP that demonstrated a higher stability for removal of MB dye. pH affected the removal efficiency of both dyes and the degradation of both dyes was sharply dropped when pH was increased above 4. The removal of dyes did not significantly change with increasing H₂O₂ concentration. Degradation rates of both MB and RR dyes increased 3.3 and 2.8 times with the use of MIP compared to pumice alone, respectively. Furthermore, MIP enabled a good removal efficiency at higher dye concentrations. It can be emphasized that MIP composite can be used in the heterogeneous Fenton-like systems considering the economic and easily separation aspects.

• 자연과학논문집
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• 제9권1호
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• pp.9-17
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• 1997

염색가공 폐액중의 반응성 염료에 대한 탈색효과를 검토하기 위하여 산화력이 강한 오존을 사용하여 염료의 농도, 처리용액의 pH, 처리용액의 온도조건 등을 변화시켜 가며 오존의 농도와 피로시간에 대한 염료의 탈색과정에 대하여 연구하였다. 오존의 처리 능력은 염료 폐액의 농도가 높아지면 그만큼 오존이 많이 필요하게 되므로 처리 속도도 떨어졌다. 반응성 염료의 탈색 속도는 진한 색상인 blue가 제일 늦었으며 옅은 색상일수록 빠르게 탈색이 진행되었다. 오존의 처리 시간이 경과함에 따라 반응성 염료의 색상은 중간색을 거쳐 무색으로 변하여 색상이 파괴됨을 보였다. 반응성 염료는 색상에 따라 약간의 차이는 있지만 알칼리 영역에서보다는 산성영역에서 더 빠르게 탈색이 진행되었다. 오존처리 온도가 낮을수록 탈색속도가 빠르게 나타났지만 그 차이는 적었다.

• 한국염색가공학회지
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• 제18권5호
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• pp.53-60
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• 2006

The 1,3-bis(4-aminoaryl)squaraines showed color, change behavior, they were found to undergo reduction with sodium borohydride in solution to give colorless leuco compounds, which oxidized readily in air back to the colored squaraine dye. We have shown that initial observations indicated that the derivatives synthesized gave new donor-acceptor chromophores. It is also interesting to note than the oxidation of the leuco squaraines did initially produce a species absorbing about 630-680 wavelengths. The 1,3-squaraines have found many uses as near-infrared absorbers, laser dyes and photoconductive materials. Furthermore their color-change redox behavior has potential in the area of peroxidase-based bioassaysas oxidation sensitive indicator systems were investigated.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제39차 학술발표회
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• pp.115-116
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• 2008

The textile wastewater discharged from printing and dyeing processes is characterized by high chemical oxygen demand(COD), low biochemical oxygen demand(BOD), and heavy color. The release of dyes into the environment constitutes only small proportion of water pollution, but dyes are visible in small quantities due to their brilliance. In this study, We are investigated to optimization of Ozone Oxidation process for Decolorization.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2009년도 학술발표대회
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• pp.69-70
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• 2009