• 한국결정성장학회지
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• 제17권5호
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• pp.196-203
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• 2007

We have studied a method for the preparation of hybrid $carbon/TiO_2$ complexes involving pitch coating, pitch binding and the penetration of titanium n-butoxide(TNB) solution with porous carbon. The photocatalysts were investigated with surface textural properties and SEM morphology, structural crystallinity and elemental identification between porous carbon and $TiO_2$, and dye decomposition performance. For the all $carbon/TiO_2$ complexes prepared by some kinds of different methods, the excellent photocatalytic effect for dye degradation should be attributed to the both effects between photo-decomposition of the supported $TiO_2$ and adsorptivity of the porous carbons.

• 한국재료학회지
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• 제27권10호
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• pp.569-575
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• 2017

To improve photocatalytic performance, a $PbS/ZnO/TiO_2$ nanotube catalyst was synthesized, and its surface characteristics and photocatalytic efficiency were investigated. The hybrid photocatalysts were produced by anodic oxidation and successive ionic layer adsorption and reaction(SILAR). The photocatalytic efficiency was evaluated using the dye degradation rate. The $PbS/ZnO/TiO_2$ photocatalyst significantly enhanced the photocatalytic activity for dye degradation, which was ascribed to the synergistic effect of their better absorption of solar light and a decrease in the rate of excited electron-hole recombination.

• 한국세라믹학회지
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• 제54권4호
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• pp.308-313
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• 2017

In this study we examined the photo-degradation efficiency of $CoS_2-G-TiO_2$ nanocomposites under visible light irritation using Reactive Black B (RBB) as standard dye, $CoS_2-G-TiO_2$ nanocomposites synthesized by facial microwave assist technique, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopic analysis. Our results show the efficiency of the $CoS_2-G-TiO_2$ ternary nanocomposite is better than $CoS_2-G$ and $TiO_2-G$ nanocomposite. The degradation efficiency of $CoS_2-G-TiO_2$ nanocomposite was found approximately 89% of Reactive Black B (RBB) degraded after 180 min. Our results will open new way for the development of a new ternary nanocomposite photocatalytic application.

• 복식문화연구
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• 제11권6호
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• pp.902-912
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• 2003

The purpose of this research was two-folds; first, to investigate the type of soil contaminated in the Hunsang excavated from the Milchang-gun burial of Mapo for the purpose of proposing the adequate washing method, second, to utilize the chemical degradation result obtained from the previous research to identify the natural dye source used in the Hunsang textile. The application of KS K0251 test showed that the soil was more oleophilic than hydrophilic thus indicating that wet cleaning was more adequate that dry cleaning for the removal of Hunsang soil. The GC-MS result of the Hunsang extraction showed dimethyl phthalate and 2,4-di-tert-butylphenol as its degradation product and these coincided with the degradation products from the alizarin standard data of previous research. The comparison of the two suggested that it is likely that Hunsang was dyed with madder which has alizarin as its major chromophore.

• 한국물환경학회지
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• 제27권2호
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• pp.194-199
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• 2011

This study has been carried out to evaluate the performance of $PbO_2$ electrode for the purpose of degradation of N,N-Dimethyl-4-nitrosoaniline (RNO, indicator of OH radical), generation of ozone and decolorization of Rhodamine B (RhB) in water. The effect of the applied current (0.2~1.2 A), electrolyte type (NaCl, KCl and $Na_2SO_4$), electrolyte concentration (0.0~2.5 g/L) and solution pH (3~11) were evaluated. Experimental results showed that RhB and RNO removal were increased with the increase of current, NaCl dosage and decrease of pH. Ozone generation tendencies appeared with the almost similar to the RhB and RNO degradation, except of solution pH (Ozone generation was increased with increase of pH). Optimum current for RhB degradation and consumption of electric power was 1.0 A. The RhB degradation with Cl type electrolyte were higher than that with the sulfate type. Optimum NaCl dosage for RhB degradation was 1.0 g/L.

• 한국미생물·생명공학회지
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• 제27권2호
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• pp.118-123
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• 1999

A bacterial strain, designated T116, degrading terephthalic acid (TPA) was isolated from the soil around Taegu industrial area into which dye works wastewater flow. The isolate was identified as pseudomonas sp. based on its morphological and physiological characteristics. Degradation of TPA by the strain T116 was confirmed with UV scanning and HPLC. About 90% and 98% of TPA were degraded after 36 and 60 hours, respectively, during the culture in a liquid medium containing 0.1% TPA. Addition of KH2PO4 at a final concentration of 100ppm enhanced the chemical oxygen demand (COD) removal rate about 50% from dye works wastewater by Pseudomonas sp. T116. Optimum pH and temperature for COD reduction from wastewater were 7.0 and 3$0^{\circ}C$, respectively. The bacterium was applied to the continuous culture for the treatment of dye works wastewater whose TPA concentration and CODMn were 2,200ppm and 1,620ppm, respectively. It was observed that 90-95% of COD was eliminated after 4 days culture in the continuous culture with a retention time of 37 or 47 hours.

• 한국의류학회지
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• 제29권12호
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• pp.1608-1618
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• 2005

본 연구는 꼭두서니와 그 표준 색소인 알리자린으로 염색한 직물에 조건적 퇴화를 유도하고, 가스 크로마토그라피 질량분석기(GC-MS)를 이용해 퇴화물을 분석하여 이를 선행연구에서 밝혀진 표준 알리자린 색소의 퇴화물과 비교함으로써 대조구로서의 꼭두서니 염료의 정보를 완성하는데 그 목적을 둔다. 아울러 퇴화 전후 염직물의 색차를 측정하여 조건퇴화에 따른 색의 변화를 조사하였다. 퇴화조건은 상온 (RT), 저온$(7^{\circ}C)$ (LT), 고온$(100^{\circ}C)$(OV)의 세 종류의 온도 조건과 염료 폐수처리 용도로 활용되고 있는 $H_2O_2/UV$법 (PER)을 사용하였다. 퇴화시간은 6시간, 24시간, 48시간, 1주, 2주, 4주 각각을 측정하였다. 꼭두서니와 알리자린 염직물 모두 퇴화 전후의 시료에서 alizarin(10.1분)이 검출되었다. 꼭두서니와 알리자린 염직물 모두 퇴화 후 benzoic acid(4.7분), 2,4-di-tert-butylphenol(6.8분), phthalic anhydride(5.8분)가 검출되었다. 꼭두서니와 알리자린 염직물 모두 퇴화 후 붉은색과 노란색이 감소하였다. 꼭두서니 염직물보다 알리자린 염직물의 경우 퇴화 전후의 색차가 더 심하였다. 그러나 가장 퇴화조건이 강한 PER퇴화조건 하에서는 꼭두서니 염직물의 색차가 1주 경과 후에도 매우 심하게 나는 것을 볼 수 있었다. 본 연구의 결과꼭두서니와 그 표준 색소로 염색한 직물이 퇴화할 경우에도 선행연구에서 밝혀진 알리자린의 퇴화물인 benzoic acid, 2,4-di-tert-butylphenol, phthalic anhydride가 검출됨을 확인하였다. 따라서 이들 화합물은 갈변되어 고유의 색을 알 수 없는 출토복식의 염료를 판정할 때 꼭두서니 염료의 사용여부를 확인할 수 있는 대조구 화합물로 사용될 수 있을 것으로 사료된다. 퇴화 전후의 색차에 대한 측정결과는 퇴화에 따른 염료의 색 변화에 대한 결과이다 출토복식의 갈변현상은 염료의 변색과 더불어 토양 유기물에 의한 착색도 기인하므로, 출토복식의 색상 변화를 실질적으로 조사하기 위해서는 본 연구의 결과와 함께 토양유기물에 의한 착색에 대한 연구가 병행되어야 할 것으로 본다

• Advances in environmental research
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• 제5권3호
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• pp.189-200
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• 2016

This study aimed at advanced oxidation of hetero tri-functional reactive dye Acid orange 7 using photo-Fenton conditions in a lab-scale experiment. Decolourisation of Acid Orange 7 dye by Fenton's process was dependent on concentration of Hydrogen peroxide, Ferrous sulphate, pH, and contact time. A $2^3$ factorial design was used to evaluate the effects of these key factors: pH, Fe(II), and $H_2O_2$ concentration, for a dye concentration of 50 mg/L with COD of 340 mg/L at pH 3.0. The response function was removal of colour under optimised conditions; pH 3.0, [Fe(II)] 40.83 mg/L, [$H_2O_2$] 4.97 mmol/L; 13.6 min. of treatment resulting in 100% colour removal. The final COD of treated wastewater was nil suggesting that AOP is a potentially useful process of color removal and dye degradation/mineralisation of effluent having AO7. Minimum contact time for complete decolourisation was at 5 mmol/l $H_2O_2$ concentration. Increase in $FeSO_4$ (mg/l) concentration resulted in decrease of time for complete decolourisation. Box-Behnken Design was used to optimize the process variables. Maximum and minimum levels of pH (3-5), $H_2O_2$ (4-6 mmol/l), $FeSO_4$ (30-46 mg/l) and contact time (5-15 minutes) were used. The statistical analysis revealed a value of 0.88 for coefficient of regression ($R^2$) indicating a good fit of model. Calculated F-value was found higher than the tabulated value confirming to significance of the model. Based on student's t-test, Ferrous sulphate, pH, and contact time have a positive effect on the percent decolourisation of Acid Orange 7.

• 한국환경보건학회지
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• 제40권2호
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• pp.137-146
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• 2014

Objectives: Feasibility of electrochemical oxidation of the aqueous non-biodegradable wastewater such as cationic dye Rhodamine B (RhB) has been investigated in an electrochemical reactor with solid polymer electrolyte (SPE). Methods: Nafion 117 cationic exchange membrane as SPE has been used. Anode/Nafion/cathode sandwiches were constructed by sandwiching Nafion between two dimensionally stable anodes (JP202 electrode). Experiments were conducted to examine the effects of applied current (0.5~2.0 A), supporting electrolyte type (0.2 N NaCl, $Na_2SO_4$, and 1.0 g/L NaCl), initial RhB concentration (2.5~30.0 mg/L) on RhB and COD degradation and $UV_{254}$ absorbance. Results: Experimental results showed that an increase of applied current in electrolysis reaction with solid polymer electrolyte has resulted in the increase of RhB and $UV_{254}$ degradation. Performance for RhB degradation by electrolyte type was best with NaCl 0.2 N followed by SPE, and $Na_2SO_4$. However, the decrease of $UV_{254}$ absorbance of RhB was different from RhB degradation: SPE > NaCl 0.2 N > $Na_2SO_4$. RhB and $UV_{254}$ absorbance decreased linearly with time regardless of the initial concentration. The initial RhB and COD degradation in electrolysis reaction using SPE showed a pseudo-first order kinetics and rate constants were 0.0617 ($R^2=0.9843$) and 0.0216 ($R^2=0.9776$), respectively. Conclusions: Degradation of RhB in the electrochemical reactor with SPE can be achieved applying electrochemical oxidation. Supporting electrolyte has no positive effect on the final $UV_{254}$ absorbance and COD degradation. Mineralization of COD may take a relatively longer time than that of the RhB degradation.

• 대한화장품학회지
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• 제34권2호
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• pp.75-82
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• 2008

본 연구에서는 금 나노입자 콜로이드를 이용하여 safranin-O의 광촉매적 분해를 관찰하였다. 금 나노입자는 용액상에서 safranin-O의 분해 속도를 빠르게 하기 위해서 사용되었다. 금 나노입자 콜로이드는 수용액상에서 $Na_2CO_3$와 PVP 고분자(poly(vinyl pyrrolidone))를 이용하는 환원방법에 의하여 제조하였다. Safranin-O의 분해현상은 자외선(UV light)와 과산화수소($H_2O_2$)의 존재 하에서 금 나노입자 콜로이드와 염화금의 농도, 반응계의 산도(pH), 반응시간과 같은 실험조건들의 조절을 통해 연구되었다. 분해반응에 사용된 금 나노입자 콜로이드의 농도가 증가함에 따라서 염료가 분해되는 속도가 증가하였다. Safranin-O의 광산화 반응은 광학적으로 측정되었고, 금 나노입자의 기본적인 물성과 촉매 특성은 UV-Vis 광학계를 이용하여 측정되었다.