Methyl Orange를 이용한 나일론 직물의 염색 및 산성용액 접촉에 따른 색 변화

이소현,강채린,박진희,이정진 한국섬유공학회 2020 한국섬유공학회지 Vol.57 No.2

Strong acids, such as hydrochloric acid and sulfuric acid, are colorless and are not easily detected when leaked. Halochromic dyes can be used for detecting strong acids because they show different colors when exposed to acid liquids. In this study, methyl orange was used as a pH-indicating dye in detecting acid liquids. Nylon 66 woven fabric was dyed with methyl orange, and the dyeing properties were determined, along with the pH-sensing property, colorfastness, and fixing agent effect. Methyl orange in an aqueous solution showed maximum absorption at 464 nm with orange color at a pH of 5−10, whereas the maximum absorption changed to 507 nm showing red color at a pH of 2. Nylon 66 dyed with methyl orange exhibited a good color yield (K/S), and the dyeing property was influenced by the pH and dye concentration. When the dyed sample was immersed in a solution with a pH range of 3.5−4.0, its original orange color was maintained. Then, the color turned to reddish-orange when immersed in a solution of 2.0-3.0 pH and red in a pH 1.5 solution. The acid-sensing property was retained after fixing agent treatment. The wash and water fastness of the dyed fabrics varied from poor to very poor, and the fastness of the staining was improved to a moderate level by fixing agent treatment. The lightfastness indicators before and after the application of fixing agent treatment were moderate and good, respectively.

촉매 오존화 공정에서 메틸오렌지 제거에 미치는 운전변수의 영향

이명은(Myoung-Eun Lee),김지은(Ji-Eun Kim),정재우(Jae Woo Chung) 대한환경공학회 2017 대한환경공학회지 Vol.39 No.7

촉매오존화 공정에 의한 메틸오렌지 제거특성과 그에 미치는 운전변수의 영향에 관한 회분식 실험과 동력학적 연구를 수행하였다. 활성탄은 오존의 자가분해를 촉진시켜 OH·를 발생시키므로 메틸오렌지 분해속도를 증가시키는 것으로 나타났다. 활성탄의 투입량이 증가함에 따라 메틸오렌지 분해반응의 속도상수가 증가하는 것으로 나타났다. 가스상 오존농도 증가는 수용액으로의 물질전달을 증가시켜 메틸오렌지 분해반응의 속도를 증가시키는 것으로 나타났다. 메틸오렌지 제거반응은 실험된 5~12 범위에서, TOC 제거는 7 이상의 pH에서 큰 영향을 미치지 않는 것으로 나타났다. 이러한 결과는 촉매오존화공정이 효과적인 염료처리 기술로서 고려될 수 있음을 보여준다. Removal characteristics of methyl orange and their dependence on operating parameters in a catalytic ozonation were investigated through a series of batch experiments. Activated carbon enhanced the self-decomposition of ozone, generating OH·, thus promoting methyl orange degradation. As the carbon dose increases, the pseudo-first order rate constants of methyl orange degradation increased, resulting in the fast removal of methyl orange. The increase of gaseous ozone concentration enhanced the mass transfer to the aqueous solution, therefore, promoted the methyl orange removal. The methyl orange degradation was not significantly affected by the change of pH in the range of 5~12, and TOC removal was negligibly affected by the variation of pH over 7. The results indicate that the catalytic ozonation can be considered as an effective dye treatment technology.

Silver Surface의 특성에 따른 Methyl Orange의 표면증강라만스펙트럼에 관한 연구

이철재 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.3

In this study, the experiments for surface enhancement of silver mirror substrates were done, where we checked the characteristics of silver surface made by Tollen's method. The surface enhancement of Methyl orange was analyzed by silver surfaces. We observed the Surface Enhanced Raman Spectra of Methyl orange. The assignments of the vibrational bands shown in SERS spectra are given based on both literature and the semi-empirical calculations at the PM3 methods. We deduced that the adsorption orientation of Methyl orange was little tilted parallel to the silver surfaces by using of the surface selection rules.

Facile Fabrication of Quaternary Ammonium Salt Modified Cotton Linter by Radiation Grafting and its Effective Removal of Methyl Orange: Batch and Dynamic Flow Mode Studies

Jifu Du,Manman Zhang,Zhen Dong,Xin Yang,Houhua Xiong,Zhengkui Zeng,Zhiyuan Chen,Long Zhao 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4

Methyl orange plays a vital role in various branches of the dyeing and textile industries and must be treated beforebeing discharged into the environment. In this study, methacryloxyethyltrimethyl ammonium chloride (DMC) functionalizedcotton linter (DMCCL) was prepared using a radiation technique. The prepared DMCCL was then characterized by IR, SEM,TG, and XPS analyses. The results showed that DMC was successfully grafted onto the surface of the cotton linter. Theadsorption performance toward methyl orange (MO) was investigated using batch and fix-bed column experiments. Adsorption kinetic and isotherm studies were well described by pseudo-second-order kinetic and Langmuir isotherm model,respectively. The maximum adsorption capacity for MO was 645.16 mg/g. The fixed-bed column experiment showed thatThomas and Yoon-Nelson models described the experimental data well. The column study showed the adsorption capacityreached 564.46 mg/g with a MO concentration of 25 mg/l and flow rate 1.5 ml/min. The saturated DMCCL column could beregenerated efficiently by eluting with 1 M HCl. Therefore, the DMCCL exhibited excellent adsorption performance, whichis suitable for MO removal from aqueous solution.

Rapid removal of methyl orange by a UV Fenton-like reaction using magnetically recyclable Fe-oxalate complex prepared with rice husk

Heo, Jun Neoung,Do, Jeong Yeon,Son, Namgyu,Kim, Junyeong,Kim, Yang Soo,Hwang, Haejin,Kang, Misook Elsevier 2019 Journal of industrial and engineering chemistry Vol.70 No.-

<P><B>Abstract</B></P> <P>Porous Fe-oxalate complexes were prepared by thermally treating iron sources and rice husks under nitrogen gas purging. Fe oxidation states of 0, 2.5+, and 3+ in the complex were identified by X-ray photoelectron spectroscopy, which were oxidized into ferrites and separated by the magnet after removal of methyl orange. The Fe-oxalate complex treated at 700°C exhibited the strongest magnetic properties, and its catalytic ability to remove 100ppm of methyl orange was optimized after 60min. In conclusion, the oxalate ions in Fe-oxalate complex could promote the decomposition of organic compounds accelerating the OH radical generation in a UV Fenton-like system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Recyclable Fe-oxalate complexes were synthesized. </LI> <LI> The Fe-oxalate complex treated at 700°C exhibited the strongest magnetic property. </LI> <LI> The Fe-oxalate complex perfectly removed 100ppm of methyl orange in 60min. </LI> <LI> Oxalate ions in Fe-complex accelerated the generation of OH radicals. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Rapid removal of methyl orange by a UV Fenton-like reaction using magnetically recyclable Fe-oxalate complex prepared with rice husk

허준녕,도정연,손남규,김준영,김양수,황해진,강미숙 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-

Porous Fe-oxalate complexes were prepared by thermally treating iron sources and rice husks undernitrogen gas purging. Fe oxidation states of 0, 2.5+, and 3+ in the complex were identified by X-rayphotoelectron spectroscopy, which were oxidized into ferrites and separated by the magnet after removalof methyl orange. The Fe-oxalate complex treated at 700 C exhibited the strongest magnetic properties,and its catalytic ability to remove 100 ppm of methyl orange was optimized after 60 min. In conclusion,the oxalate ions in Fe-oxalate complex could promote the decomposition of organic compoundsaccelerating the OH radical generation in a UV Fenton-like system.

Effects of the protonation and the polar solvation on the molecular properties of methyl orange: A density functional theory study

유강현,권오필,김동욱 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.6

Methyl orange (MO) and its protonated derivatives were investigated at thedensity functional theory (DFT) level using CAM-B3LYP functional and 6-311+G(d,p) basis sets; their absorption spectra in aqueous solution were simu-lated, their relative stabilities in both the gas phase and the polar solutionswere calculated, and the activation energy barrier for thecis-to-transisomeriza-tion in both phases were computed. Except the protonation at the aminogroup, all the protonated isomers show a bathochromic shift of the mostintense absorption peak. In the gas phase, the sulfonate unit turns out to bethe most favorable proton acceptor. In the polar solutions, however, azogroups are more effective to accept the proton. The protonation at the azo Natom next to the phenyl-sulfonate group significantly reduces the energy bar-rier for thecis-to-transconversion in the aqueous solution, which suggests aswift conversion in the ground state.

Degradation kinetics for photocatalytic reaction of methyl orange over Al-doped ZnO nanoparticles

이현정,김주현,박승수,홍성수,이근대 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-

Al-doped ZnO nanoparticles with different Al concentrations were prepared and employed as photocatalysts for the degradation of methyl orange. The samples were characterized by XRD, FESEM, XPS, BET, UV–vis DRS and photoluminescence techniques. The kinetic behavior could be described in terms of the Langmuir–Hinshelwood model. The adsorption equilibrium constant increased with increasing Al concentration and the reaction rate constant showed a maximum at 3% Al. It can be deduced that the enhancement of photocatalytic activity of ZnO by addition of Al could be attributed not to increase of surface area but to effective suppression of photoinduced electrons and holes.

Synthesis of Active MFe2O4/γ-Fe2O3 Nanocomposites (Metal = Ni or Co) for Reduction of Nitro-Containing Pollutants and Methyl Orange Degradation

G. M. El-Subruiti,A. S. Eltaweil,S. A. Sallam 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.10

Metal-ferrite/maghemite nanocomposites (NiFe2O4/***γ-Fe2O3 and CoFe2O4/γ-Fe2O3) were synthesized via doping maghemite with metal salt (NiCl2 or CoCl2) followed by reduction of metal ions using NaBH4. The synthesized metal-ferrite/maghemite nanocomposites were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared (FTIR) and the amounts of the dopant-metal (Ni/Co) were determined using ICP-OES technique. Results showed that this synthetic route produced nanocomposites with highly active ferrite phases MFe2O4. The synthesized nanocomposites exhibited exceptional catalytic activities for the reduction of 4-nitrophenol and 2-nitroaniline as well as the catalytic degradation of methyl orange. Specific activity parameter of NiFe2O4/γ-Fe2O3 and CoFe2O4/γ-Fe2O3 toward reduction of 4-NP reached 993.9 and 929.8 s -1 g -1 metal, respectively. These high values of specific activities are higher than most reported metal-ferrite composites prepared via traditional co-precipitation methods. Besides, strong magnetic properties of the prepared metal-ferrite/maghemites facilitates easy separation process for several reuses.

Characterization and Photocatalytic Performance of Nanosize TiO₂ Powders Prepared by the Solvothermal Method

Nam, Woo Seok,Han, Gui Young 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.6

The solvothermal reaction of titanium tetra-isopmpoxide (TIP) in Werent alcohol solvents was investigated in the pressure range 40±2 bar to prepare Titanium (IV) oxide. The results show that the physical properties of the prcducts, such as nystal size, shape, and structure, are strongly influenced by the types of solvents and temperature during the reaction. The effects of reaction conditions on the physical properties and the crystal structure of powder were investigated by using XRD, SEM, DLS, DSC and BET. The obtained TiO₂ powder prepared at an organic solvent condition exhibited submicron size and huge surface area with a narrow size distribution hut some agglomeration. TiO₂ powder prepared at 1,4-butanediol and 623 K shows the highest photoactivity on the photodegradation rate of methyl orange.