• 한국생물공학회:학술대회논문집
• /
• 한국생물공학회 2003년도 생물공학의 동향(XII)
• /
• pp.356-360
• /
• 2003

분리된 미생물 중 염색폐수의 색도 제거능이 우수한 3균주(RA1, RA2, YA1)을 선별하여 실험에 이용하였다. 동일한 조건에서 실험한 결과 YA1이라 명명한 균주가 약 53%의 색도제거율을 보여 가장 우수한 균주로 판명되었고, 최적의 배양조건을 탐구하는 연구를 수행하였다.

• Journal of the Korean Wood Science and Technology
• /
• 제51권6호
• /
• pp.481-492
• /
• 2023

The ecofriendly lifestyle has attracted considerable support for sustainable development. Natural dyes, as sustainable products, have become a research focus and development area for many scientists. Ecofriendly processing also supports circular sustainable development. This study effectively obtained tannins as a natural dye from merbau (Intsia bijuga) sawdust using water as an ecofriendly solvent. Merbau sawdust is an underutilized industrial waste. Temperature and solid-solvent ratio variations were performed to extract tannins from merbau sawdust. Temperature and solid-solvent ratio positively affected solution yield and tannin concentration. The optimal condition was identified using response surface methodology and experimental observations. A yield of 0.2217 g tannins/g merbau was obtained under the conditions of 333.15 K and 0.125 solid-solvent ratio. Extraction was controlled by convective mass transfer at the interface of solid particles.

• Journal of Forest and Environmental Science
• /
• 제32권3호
• /
• pp.253-261
• /
• 2016

Xanthoceras sorbifolia seed coat (XSSC) is a processing residue of the bioenergy crop. This work aimed to evaluate the applicability of using the steam explosion to modify the residue for dye biosorption from aqueous solutions by using methylene blue as a model cationic dye. Equilibrium, kinetic and thermodynamic parameters for the biosorption of methylene blue on the steam-exploded XSSC (SE-XSSC) were evaluated. The kinetic data followed the pseudo-second-order model, and the rate-limiting step was the chemical adsorption. Intraparticle diffusion was one of the rate-controlling factors. The equilibrium data agreed well with the Langmuir isotherm, and the biosorption was favorable. The steam-explosion pretreatment strongly affected the biosorption in some respects. It reduced the adsorption rate constant and the initial sorption rate of the pseudo-second-order model. It enhanced the adsorption capacity of methylene blue at higher temperatures while reduced the capacity at lower ones. It changed the biosorption from an exothermic process driven by both the enthalpy and the entropy to an endothermic one driven by entropy only. It increased the surface area and decreased the pH point of zero charge of the biomass. Compared with the native XSSC, SE-XSSC is preferable to MB biosorption from warmer dye effluents.

• 분석과학
• /
• 제10권3호
• /
• pp.225-229
• /
• 1997

졸겔법에 의해 제조된 organically modified silicate(Ormosil)에 Rhodamine 6G perchlorate(Rh6GP)를 침투시켰으며, 이 유기염료가 무기/유기 복합 기저체(host)에 안정하게 침투되었는지를 확인하였다. 복합졸의 상태에서 측정된 유기염료의 흡수스펙트럼과 겔화된 후의 스펙트럼, 그리고 복합체가 완전히 건조된 상태에서의 스펙트럼을 비교하여 Rh6GP가 이합체화되지 않고 안정한 상태로 있을 수 있는 Ormosil의 조성을 확립하였다. 졸겔반응시의 촉매로 사용된 염산의 농도가 Tetraethyl orthosilicate(TEOS) 1몰을 기준으로 0.1몰 이내의 범위에서만 유기염료가 안정하고 이합체화되지 않은 상태가 유지되었다.

• Bulletin of the Korean Chemical Society
• /
• 제31권9호
• /
• pp.2531-2536
• /
• 2010

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of two dyes containing diphenylaniline and 4-diphenylamino-diphenylaniline as donor moiety (TPA1 and TPA3). The geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating capability of 4-diphenylamino-diphenylaniline is stronger than that of diphenylaniline. The computed highest occupied molecular orbital (HOMO) energy levels are -5.31 and -4.90 eV, while the lowest unoccupied molecular orbital (LUMO) energies are -2.29 and -2.26 eV for TPA1 and TPA3, respectively, revealing that the interfacial charge transfer between the dyes and the semiconductor electrode are electron injection processes from the photon-excited dyes to the semiconductor conduction band. Furthermore, all the experimental absorption bands of TPA1 and TPA3 have been assigned according to the TDDFT calculations.

• 자연과학논문집
• /
• 제10권1호
• /
• pp.103-109
• /
• 1998

본 연구는 오존의 강한 산화력을 이용하여 기상의 처리방법에 따른 비스코스 레이온의 탈색효과를 연구하였다. 오존이 발생할 때는 기체상태로 고농도이지만, 수용액 상태로 물에 녹이는 과정에서 기화요인에 의하여 오존의 손실이 많았다. 따라서 기존의 오존처리방법인 수용액상태의 처리방법이 아니라 기상의 오존을 직접 직물에 처리하므로 고농도의 오존을 단시간동안 처리하여 직물에 존재하는 색소를 산화시켜 탈색하는 방법을 사용하였다. 기상의 오존은 직접 유기색소와 반응하지 않기 때문에 물을 매개체로 하여 pick up ratio를 60%, 50%, 40%, 30%, 20%로 변화시키면서 비스코스 레이온의 탈색에 대하여 연구하였다. Pick up ratio가 40%일 때가 유기색소를 분해하는데 필요한 최적의 수산기가 발생하므로 처리포의 탈색효과가 가장 좋았다. 그러나 처리기간이 길수록 너무 과다하게 오존에 의해 산화되므로 강도와 신도의 저하를 초래하였다. 따라서 최적의 기상오존 처리시간은 60분정도에서 처리하는 것이 강도와 신도의 저하를 가장 적게 할 수 있고 백도도 향상시킬 수 있는 것으로 사료된다.

• 한국의류산업학회지
• /
• 제8권3호
• /
• pp.343-348
• /
• 2006

This study aims to attain gray tone dyed goods by using tannin that is contained in green tea. Tannin is given general name of polyphenol, which has a characteristic that bonds with protein and it is used for food preservative that protects against bacteria, as well as its purpose of black tone dye for silk treatment that has been processed since its early ages. In particular, as tannin reacts with all kinds of metallic mordant and changes to various colors, when tannin acid is combined with iron, it becomes tannin steel and produces gray tone color. Tannin that is contained in green tea is condensed tannins and its structure does not hydrolyze, thus having flavan type structure. In order to find the suitable condition for processing tannin, UV-Vis part absorption spectrum of green tea tannin, dye ability based on temperature and time, reflection rate based on concentration, color changes based on acid treatment and alkali treatment, changes on surface based on concentration or metal mordant condition, and lightfastness were measured. Maximum absorption wavelength (${\lambda}_{max}$) of green tea tannin was at around 273nm, while strong absorption was also observed at below 350 nm. Dye ability of green tea tannin is done more easily on silk rather than cellulose fibers such as cotton, while the optimum condition for dyeing was observed to be at $60^{\circ}C$, for 20 minutes. As a result of acid treatment, the color of dye material consisted highly of gray tones and showed overall gray tone with the combined color of yellow and red after the alkali treatment. While it was observed that as dye concentration and metal mordant concentration increased, the color changed at counter-clockwise direction on the Y-scale of Munsell's scale of colors. Additionally, lightfastness was more on a normal fading.

• 한국미생물·생명공학회지
• /
• 제29권2호
• /
• pp.67-71
• /
• 2001

자연계로부터 anthraquinone계 염료인 Remazol brilliant blue R를 분해.탈색하는 호알칼리성 균주를 분리하여 Bacillus sp. ARB1으로 명명하고 성장특성을 조사하였다. 최적 배양온도와 pH는 $35^{\circ}C$, pH 9.0로 나타났다. 배양액의 초기 pH가 10과 10.5일 경우 배양시간의 경과에 따라 pH 값이 점점 감소하여 40시간 후 9.3, 9.4로 각각 감소하였다. 진탕배양의 경우가 정치배양의 경우보다 Bacillus sp. ARB1의 탈색율이 현저히 높았다. 최적 배양조건에서 Bacillus sp. ARB1을 회분배양한 결과 배양 32시간 후 93%의 탈색율을 나타내었다. 실제 염색가공폐수를 사용한 회분배양에서 40시간 후에 탈색율은 78%로 나타났다.

• 한국염색가공학회지
• /
• 제21권2호
• /
• pp.1-6
• /
• 2009

Recently, polyester is widely used in textile fabrics due to its application potentials in various fields. It is known that askin fabric is prepared with mainly polyester and is enjoyed with various end uses such as marine clothing, underwear, shirts, swimming suits and so on. For this purpose, color fastness should be considered with great importance during its wet processing step. In this context, vat dyes were very much attracted due to the advantage of superior fastness property. Thus, we have used indigo dye towards askin fabric dyeings and investigated corresponding properties namely, dyeing temperature, concentration of dye, reducing agent amount and alkali amount. The results showed that higher color strengths of indigo dyeing on askin fabric were obtained at $110^{\circ}C$, 8% o.w.f, 3g/l, 5g/l, respectively. The color fastness to washing was considerable generally.

• 한국분말재료학회지
• /
• 제25권4호
• /
• pp.309-315
• /
• 2018

In the present work, we synthesize nano-sized ZnO, $SnO_2$, and $TiO_2$ powders by hydrothermal reaction using metal chlorides. We also examine the energy-storage characteristics of the resulting materials to evaluate the potential application of these powders to dye-sensitized solar cells. The control of processing parameters such as pressure, temperature, and the concentration of aqueous solution results in the formation of a variety of powder morphologies with different sizes. Nano-rod, nano-flower, and spherical powders are easily formed with the present method. Heat treatment after the hydrothermal reaction usually increases the size of the powder. At temperatures above $1000^{\circ}C$, a complete collapse of the shape occurs. With regard to the capacity of DSSC materials, the hydrothermally synthesized $TiO_2$ results in the highest current density of $9.1mA/cm^2$ among the examined oxides. This is attributed to the fine particle size and morphology with large specific surface area.