JOURNAL OF COLOR SCIENCE AND TECHNOLOGY
Year:2018 | Volume:11 | Issue:4 |Papers Count:8

Metal salts such as copper not only cause a variety of colors in dyeing, but also improve wash and light fastnesses of direct dyes. Copper sulfate and copper nano-particles are used as disinfectant against fungal and bacterial infections. In this paper, cotton fabric was dyed with direct dye, then copper sulfate and copper nano-particles were used on dyed fabrics. The color characteristics of the samples, light and wash fastnesses were measured. Atomic absorption analysis was taken to measure the amount of copper ions, and antibacterial test was carried out for antibacterial properties of nano-copper and copper sulfate impregnated samples. Nano-copper resulted neighboring properties to copper sulfate in lower concentrations. So that a concentration of 1% copper sulfate showed close results to concentration 0. 0001 % of the copper nano particles. The results showed that at higher concentrations up to 1% copper sulfate and 0. 0001 % for nano copper, color yield was constant and wash-fastness was reduced. Light fastness indicated reducing color yield after exposure to light. However, at higher concentrations, better light fastness was observed that appear with increasing concentration, light fastness will be improved. J. Color Sci. Tech. 11(2018), 239-244© . Institute for Color Science and Technology.

In this research, zinc oxide-manganese oxide nanocomposite adsorbent based on active alumina was synthesized by heterogeneous precipitation method of urea homogeneous hydrolysis that is an applied and economical method. The effect of calcination temperature on morphology, formation of phase, type of formed bonds and the crystallite size of nano-composite were tested by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), analysis of gravimetric thermal (TGA) and fourier transform infrared (FT-IR). The effect of different weight ratios of zinc oxide and manganese oxide (alumina with constant wt%) on surface area, surface charge of nanocomposites and eventually adsorption of methyl orange anionic dye were investigated. The results indicated that the sample contains 35 wt. % of zinc oxide calcined at 400 ° C, showed 96 % adsorption efficiency (within twenty minutes) for the methyl orange anionic dye. These can be attributed to the high surface area (88 m2/gr) and also active sites of the nanocomposite. Microscopic observations showed formation of nanoflakes on surfaces of active alumina particle. J. Color Sci. Tech. 11(2018), 245-255© . Institute for Color Science and Technology.

In this research, ZnO NPs were synthesized via a green chemistry method using phenylalanine. At the first step, phenylalanine, 5– sulfosalicylaldehyde sodium salt, and zinc acetate dehydrate were separately solved in water. The obtained solutions were then mixed and stirred to appear white sediment. This compound was calcined to synthesis ZnO powder. The STA results showed that phase transformation was accomplished in the temperature range of 400-500 º C; therefore the firing temperatures were selected as 400 and 500 º C. Both of the samples consisted of ZnO phase without impurity, whereas peaks intensity and degree of crystallinity increased by increasing the calcination temperature. Microscopic images showed that particle size and image quality were improved by temperature increasing. This phenomenon led to improve the optical properties of the synthesized sample. The absorbance and photoluminescence were intensified by increasing the calcination temperature. J. Color Sci. Tech. 11(2018), 257-263© . Institute for Color Science and Technology.

Dyes are one of the most important pollutants in textile wastewater, which are often carcinogenic, mutagenic and non-biodegradable, so it is important to remove them from the wastewater in terms of the environment. Therefore, the purpose of this study is to evaluate the efficiency of the compilative process of US/S2O8-2 in Eosin Y Dye removal from Aqueous Solutions. In this experimental study, it was possible to remove Eosin Y dye using ultrasonic waves alone and with persulfate oxidants. All reactions were performed in a 1000 ml cell of the ultrasonic bath. The effects of different parameters such as molar persulfate concentration (0. 005-0. 001 mol/l), dye concentration (100-100 mg/l) and pH (11-11) were investigated. To measure Eosin Y dye, UV/Vis-DR 5000 spectrophotometer was used at 515 nm wavelength. The results of this study showed that by increasing the oxidant concentration, the removal efficiency increased significantly, then a steady trend was observed in removing Eosin Y dye. The process used (US/S2O8-2) at pH=3, the persulfate concentration of 0. 200 mol/l, and the time of 60 min had the highest removal efficiency (99. 03%). Ultrasonic alone had little effect on the removal of this dye. The results of the effect of ion changes from calcium chloride on the performance of the process of US/S2O8-2 were ineffective for Eosin Y dye. Finally, the kinetic results showed that the US/S2O8-2 process followed a first-order reaction. The results of the use of the US/S2O8-2 process in the removal of Eosin Y dye indicated that this process has the proper ability to remove dyes and can be used as an effective method to remove Eosin Y from industrial wastewaters. J. Color Sci. Tech. 11(2018), 265-274© . Institute for Color Science and Technology.

Poly (N-vinylpyrrolidone-co-maleic anhydride) @ eggshell @ Fe3O4 (PNVPMA@ES@Fe3O4) eco-friendly nanocomposite was synthesized by a two-step method. In the first step, the PNVPMA copolymer was synthesized via radical polymerization method. In the second step, the PNVPMA@ES@Fe3O4 nanocomposite was synthesized through an in-situ co-precipitation technique. The PNVPMA@ES@Fe3O4 nanocomposite was used as high performance eco-friendly adsorbent to remove Congo red (CR) dye from aqueous solutions at various conditions, such as pH effect, contact time, adsorbent dosage and dye concentration. Results showed that the percentage removal of CR by synthesized magnetic nanocomposite was more than 95% at pH=6 and contact time 30 min. The results showed that the interactions between CR and the PNVPMA@ES@Fe3O4 nanocomposite were in agreement with the Langmuir isotherm and pseudo second order kinetic model. Also, thermodynamic model showed that the CR adsorption on the synthesized nanocomposite was spontaneous. J. Color Sci. Tech. 11(2018), 275-286© . Institute for Color Science and Technology.

In the present research, Fe3O4 nanoparticles and Fe3O4-CuO nanocomposite were synthesized by Co-precipitation method under N2 atmosphere in aqueous media. Ammonia and ethylendiamin were used as precipitation agents and Tween 80 as surface modifier. Structural, morphological, magnetic, color and optical properties were studied using XRD, SEM, TEM, VSM, CIE lab and UV-Vis spectrometer, respectively. XRD results showed the Fe3O4 phase in iron oxides samples and Fe3O4 and CuO phases in iron oxide-copper oxide nanocomposite solely. Increase the uniformity of spherical nano magnetite particles was shown by SEM images in the sample synthesized by Tween80 and ethylendiamine. The average crystallite size of Fe3O4 and Fe3-O4-CuO samples was 7 and 5 nm, respectively. VSM results showed that the Fe3O4 nanoparticles and Fe3O4-CuO nanocomposites were superparamagnetic with 60 and 40 emu/g magnetization, respectively. Band gap of nanocomposites was estimated about 2. 85 eV. TEM micrographs showed that core-shell nanoparticles can be obtained with the size of 12-15 nm. Moreover, color properties showed the increase of hue and chroma values in Fe3O4-CuO nanocomposites indicated the formation of brown inorganic pigments. J. Color Sci. Tech. 11(2018), 287-295© . Institute for Color Science and Technology.

Copper ferrite nanoparticles were synthesized by sol-gel auto-combustion method and characterized by XRD, SEM, FT-IR and UV-Vis. Powder XRD analysis and FT-IR spectroscopy confirmed the formation of ferrite spinel phase. The crystallite size was calculated to be 77 nm using Scherrer’ s equation. The morphology and size of the synthesized nanoparticles have been observed by scanning electron microscopy. The energy band gaps were calculated from DRS data. Dye degradation of Direct Red 264 was carried out by CuFe2O4 as a catalyst under UV lamp. Langmuir, Toth and Fritz-Schlunder isotherms were studied in photocatalytic degradation. J. Color Sci. Tech. 11(2018), 297-304© . Institute for Color Science and Technology.