• Analytical Science and Technology
• /
• v.22 no.3
• /
• pp.254-262
• /
• 2009

Activated carbon fiber treated with iron compound (Fe-ACF) was employed for preparation of Feactivated carbon fiber/$TiO_2$ (Fe-ACF/$TiO_2$) composite catalysts. Then, the prepared Fe-ACF/$TiO_2$ composite catalysts were characterized by employing BET, SEM, XRD and EDX instruments. It showed that BET surface area was related to adsorption capacity for each composite. The SEM results showed that ferric compound and titanium dioxide were distributed on the surfaces of ACF. The XRD results showed that Fe-ACF/$TiO_2$ composite mostly contained an anatase structure with a Fe mediated compound. EDX results showed the presence of C, O, and Ti with Fe peaks in Fe-ACF/$TiO_2$ composites. From photocataytic degradation effect, it was observed in the organic dye (Methylene blue, MB) degradation by these composites. Different degradation effect can be attributed to the synergetic effects of photo-Fenton reaction of Fe. It was considered that the combined reactions of Fe-ACF/$TiO_2$ produce powerful photo-Fenton process in the MB degradation.

• Journal of the Korean Chemical Society
• /
• v.29 no.4
• /
• pp.365-371
• /
• 1985

A cationic dye, methylene blue $(MTB^+)$ was examined as a counter ion in the separation of organic and inorganic anions by ion-pair chromatography. Nonabsorbing anions could be indirectly detected by photometric detector with the assistance of MTB^+ in visible range (665nm). A mixture of anions was able to be separated with good base line resolution and high sensitivity. The capacity factors were also determined in various experimental conditions to study retention mechanism. The retention followed the ion-interaction model where the $MTB^+$ occupies a primary layer at the stationary phase while the analyte anion and other anions in the system compete for forming the secondary layer.

• Journal of Environmental Science International
• /
• v.21 no.11
• /
• pp.1371-1377
• /
• 2012

The simulated dyes solution containing Basic Red 46(BR 46), Yellow 21(Y 21), and Maxilon Blue 30(MB 30) were electrochemically oxidized using carbon fiber as an anode. The electrolyses were performed in a electrolytic flow cell constructed by Vycor glass tube. The carbon fiber was positioned in the inside of Vycor glass tube and platinum wire coiled around outside of tube as a cathode. Several operating variables, such as current, time, pH and flow rate of solution were studied. Increasing current density would lead to a corresponding increase in the dye removal efficiency 99.2 % at a 200 mA. The electrolyses time could also improve and removal efficiency was about 99 % after 1.5 hours of electrolyses. The removal efficiency was increased with the increase of flow rate of solution and optimum flow rate was 5 mL/min. THe pHs of solution affect the removal efficiency. The removal efficiency was decreased with the increase of pH of solution and optimum pH was 5.05 (0.1 M $KNO_3$).

• Journal of the Korean Chemical Society
• /
• v.27 no.3
• /
• pp.213-217
• /
• 1983

Devices that mimic the natural photosynthetic pathway are of considerable interest as fuel sources. Quantum yield of viologen radical formation in several water-in-oil microemulsion system were measured. The yield of hexadecylviologen radical formation in microemulsion system using EDTA as an electron donor, ruthenium bipyridinium complex as photosensitizer, and hexadecylviologen as an electron acceptor was 12%. When benzylnicotinamide was inserted in the interface of the microemulsion and azo compound was dissolved in oil face, the quantum yield of hydroazo compound was 0.16. Organic dye (Rose bengal) was used as photosensitizer for the photoinduced electron transfer reaction. In anionic microemulsion no electrontransfer was observed.

• Textile Coloration and Finishing
• /
• v.15 no.2
• /
• pp.93-101
• /
• 2003

To acquire dyeing ability on aramid(Nomex) spun yarn in supercritical fluid dyeing, supercritical fluid dying(SFD) machine of 3L scale was designed. C. I. Disperse Red 60 and Red 360 were used in this work. It was possible to increase dyeing ability and to get level dyeing of fiber by attaching assistance devices(controlling device of supercritical fluid, nozzle, cover of carrier, etc.) to SFD machine. Physical properties(tensile strength, elongation, shrinkage) of Nomex spun yam treated by SFD were not changed. K/S values of dyed Nomex spun yam with Red 360 were higher than that with Red 60 and color fastness of dyed Nomex spun yam by SFD was similar to that by conventional dyeing method.

• Proceedings of the Korean Fiber Society Conference
• /
• 1998.10a
• /
• pp.145-148
• /
• 1998

1821년경 최초로 "loess"라는 이름으로 사용된 황토는 산화철을 함유하는 황갈색의 광물성 염료이며, 이것은 일반적으로 황토가 포함된 원토를 채에 담아 물 속에서 선별하거나 바람에 날려 분리시켜 얻어지며, 분리되어진 황토는 불투명한 황갈색의 색조와 항균성이 있는 것으로 알려져 왔다[1]. 그러나 황토는 물기름, 유기용제 등에 불용성이며 섬유와 친화력이 없어 염색후 내세탁성이 낮아 황토 염색시 고착제인 콩즙을 이용하는 전통적인 방법이 알려지다가 최근에 Kim[2]은 고착제 없이 황토의 입자 크기를 5 $mu extrm{m}$ 이하로 하여 9$0^{\circ}C$에서 5~10 분간 교반하는 방법으로 면직물에 염색해 내세탁성과 항균성이 있는 염색물을 얻고자 하였으나 입자 크기가 5$\mu\textrm{m}$이하 수준에서도 친화력이 부족하여 내세탁성에는 크게 영향을 미치지 못하였으며 항균 효과도 낮게 나온 것으로 보고되었다. (중략)

• Proceedings of the Membrane Society of Korea Conference
• /
• 1992.10a
• /
• pp.76-76
• /
• 1992

본 연구의 목적은 국내 섬유산업에서 문제시되는 염색폐수처리에 막분리공정의 적용가능성과 문제점을 실험실규모와 pilot 규모의 실험을 통하여 규명하는 것이다. 염색폐수는 섬유의 가공공정에 따라 염료, 분산제, 정염제, 반응제 등 다양한 유기물질과 무기염을 함유하며 온도가 10-90$\circ$C로 높은 것이 특징이다. 본 연구에서는 2종류의 Nanofiltration: NF40, XU45; 두종류의 복합막; BW30, SW30HR; 2종류의 Cellulose Acetate 비대칭막의 평막 Sample을 사용하여 합성염색폐수의 배제율과 압력변화에 따른 투과수에 미치는 영향을 조사하였다. 실제 혼합염색폐수의 처리는 2개의 2.5"$\times$ 40" Nanofiltration 모듈을 장착한 Pilot 장치를 염색단지 종합처리장에 설치하여 3개월에 걸쳐 시행하였다. 현재까지 얻어진 실험결과에 의하면 전처리공정의 효율롸를 통해 부유물질에 의한 Fouling을 최소화하고 폐수의 성분분석과 사용된 막의 표면분석을 통한 체계적인 조사가 필요하다. 염색폐수처리에 막분리공정이 기존처리방법과 비교하여 경제성을 가지려면 효율적인 막세척방법을 개발하여 투과율의 감소를 최소화시켜야 한다.

• Current Photovoltaic Research
• /
• v.11 no.1
• /
• pp.1-7
• /
• 2023

Flexible dye sensitized photovoltaics (f-DSPVs) based on plastic substrates have attracted significant interest due to their light-weight, flexibility, and compatibility with roll-to-roll processing, as well as their potential application to ubiquitous power sources. However, f-DSPVs exhibit inferior power conversion efficiencies (PCE) compared to conventional DSPVs since the fabrication process must be conducted at a low-temperature (≤ 150℃) to prevent thermal damage of the plastic substrates, which generally results in poor interconnection between the TiO₂ nanoparticles. Numerous novel low-temperature manufacturing approaches for flexible photoanode and counter electrode have been developed. In this review, current progress on low temperature strategies for f-DSPVs technology are discussed.

• Journal of Conservation Science
• /
• v.35 no.6
• /
• pp.689-700
• /
• 2019

This study aimed to analyze the nature and characteristics of the preserved state, materials, and colored pigments of a Buddhist painting of Eunhaesa temple(gwaebultaeng), which is Treasure No. 1270 of Korea, through scientific investigation and analysis. Based on the historical background of the subject, the study investigated the aspects of conservation and analyzed the material characteristics of each pigment in the painting. Results indicate that various colors were created using inorganic pigments such as white lead, minium, cinnabar, orpiment, gold, atacamite, malachite, and smalt and using organic pigments such as black and indigo. The Eunhaesa painting used "cho" as a material for wallpaper, which was unusual during the Joseon period. In addition, a white layer was formed using various white pigments, which was also rare during this period.

• Journal of Conservation Science
• /
• v.36 no.6
• /
• pp.519-532
• /
• 2020

This study aimed to interpret the coloring materials recorded in the ceremonial writing with the scientific investigation results of the Hanging Painting of the Chiljangsa Temple (Five Buddhas). The results confirm that the Jinboon, Joohong, Hwangdan, Hwanggeum and Seokjahwang are clearly connected to lead white, cinnabar, minium, gold, and orpiment, respectively. Danghayeop and samrok are related to Copper trihydroxychloride, while Daecheong and Joongcheong are azurite, and they seems to be classified by the particle size. Yeonji and Chunghwa are organic dyes in red and blue, respectively, with blue confirming the existence of the side, but Yeonji differs from the names of the ancient texts and Chinese characters; it is unclear whether it is a commonly used Yeonji because of differences in the names of the ancient texts. The presence of Sootohwang has not been confirmed in the gwaebultaeng, but it can be extracted from the soil as a yellow-colored material but the possibility of Deunghwang cannot be ruled out.