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Mahmoodi N.M.,Iran Institute for Color Science and Technology
Journal of Chemical and Engineering Data | Year: 2011

In this paper, dye adsorption properties of alginate in binary systems were investigated. Physical characteristics of alginate were studied using Fourier transform infrared and scanning electron microscopy. Three textile dyes, Basic Violet 16 (BV16), Basic Red 18 (BR18), and Basic Blue 41 (BB41) were used as model compounds in single and binary systems. The effects of alginate dosage, initial dye concentration, and pH on dye removal were elucidated at 25 °C. The dye adsorption isotherm, kinetics, and thermodynamics were studied. The presence of functional groups such as hydroxyl and carboxyl groups was detected. It was found that BV16, BR18, and BB41 followed the Langmuir and extended Langmuir isotherms in single and binary systems, respectively. The adsorption kinetics of dyes was found to conform to pseudosecond order kinetics in both single and binary systems. The thermodynamic data showed that dye adsorption onto alginate was spontaneous, endothermic, and a physisorption reaction. On the basis of the data of the present investigation, one could conclude that the alginate being a biocompatible, eco-friendly, and low-cost adsorbent might be a suitable alternative to remove dyes from colored aqueous solutions. © 2011 American Chemical Society. Source


Mahmoodi N.M.,Iran Institute for Color Science and Technology
Materials Research Bulletin | Year: 2013

In this paper, magnetic zinc ferrite (ZnFe2O4) nanoparticle was synthesized and its photocatalytic dye degradation ability from colored wastewater was studied. Reactive Red 198 (RR198) and Reactive Red 120 (RR120) were used as model dyes. The characteristics of ZnFe2O 4 were investigated using Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscope (SEM). Photocatalytic dye degradation by ZnFe2O4 was studied by UV-vis spectrophotometer and ion chromatography (IC). The effects of ZnFe 2O4 dosage, initial dye concentration and salt on dye degradation were evaluated. Formate, acetate and oxalate anions were detected as dominant aliphatic intermediate. Inorganic anions (nitrate and sulfate anions) were detected as dye mineralization products. The results indicated that ZnFe2O4 could be used as a magnetic photocatalyst to degrade dyes from colored wastewater. © 2013 Elsevier Ltd. All rights reserved. Source


Mahmoodi N.M.,Iran Institute for Color Science and Technology
Journal of Environmental Engineering (United States) | Year: 2013

In this paper, photodegradation of dyes [Acid Red 14 (AR14) and Acid Red 18 (AR18)] has been studied using multiwalled carbon nanotube (MWCNT), ferrous ion (Fe2+), and hydrogen peroxide. The surface characteristics of MWCNT were investigated using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). UV-Visible (UV-Vis) and ion chromatography (IC) analyses were employed to investigate dye degradation. The effects of MWCNT, Fe2+, initial dye concentration, and salt on the photodegradation of dye were investigated. Formate, acetate, and oxalate were detected as aliphatic intermediates. The NO3- and SO42- were detected as dye mineralization products. The results showed that MWCNT/Fe2+ might be a suitable catalyst for dye degradation. © 2013 American Society of Civil Engineers. Source


Gharagozlou M.,Iran Institute for Color Science and Technology
Journal of Alloys and Compounds | Year: 2010

Magnetic nanocomposites of nickel ferrite nanoparticles uniformly dispersed in the silica matrix have been synthesized successfully by a sol-gel process using tetraethylorthosilicate (TEOS) and metallic nitrates as precursors. In addition, the influence of the annealing temperatures, varying from 400 to 900 °C, and NiFe2O4 contents, x(NiFe2O4)/(100 - x)SiO2 (10 ≤ x ≤ 60 wt.%), on the structural and magnetic properties of the nanocomposite samples have been investigated. The studies carried out using XRD, FT-IR, TEM, STA (TG-DTG-DTA) and VSM techniques. The results indicated that the structural and magnetic properties of the samples showed great dependence on the variation of the particle size caused by the annealing temperature and NiFe2O4 content. The crystallization, saturation magnetization Ms and remenant magnetization Mr increased as the annealing temperature and NiFe2O4 content increase. But the variation of coercivity Hc was not in accordance with that of Ms and Mr, indicating that Hc is not determined only by the size of NiFe2O4 nanoparticles. TEM images showed spherical nanoparticles homogeneously dispersed in the silica network and were uniform in both morphology and particle size distribution with sizes of 10-15 nm. The results showed that the well-established silica network provided nucleation locations for NiFe2O4 nanoparticles to confinement the coarsening and aggregation of nanoparticles. The synthesized nanocomposites with adjustable particle sizes and controllable magnetic properties make the applicability of nickel ferrite even more versatile. © 2010 Elsevier B.V. All rights reserved. Source


Ataeefard M.,Iran Institute for Color Science and Technology
Composites Part B: Engineering | Year: 2014

Toner as a composite of colorant, polymer and additives is a primary component of electrophotographic printing and copying processes. It can be produced by conventional mechanical milling or by more recently developed chemical polymerization methods. The emulsion aggregation is a popular chemical method that allows tight control on the size, size distribution and shape of the synthesized toner particles. These characteristics are important for producing high quality, high-resolution printed images. This research investigated the effect of agitation speed on toner synthesis using emulsion aggregation method. Particle size analysis, scanning electron microscopy, and field emission scanning electron microscopy were used to study the size, shape, and morphology of toner particles. It was found that toner particles synthesized using emulsion aggregation method is spherical in shape and decrease in size as agitation speed increases. Differential scanning calorimetry and spectrophotometric analyses results showed that the toner synthesized by this method had appropriate thermal and colorimetric characteristics as compared to an industrial toner. © 2014 Elsevier Ltd. All rights reserved. Source

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