Amido Black 10B Dye Copper Complex�Synthesis, Characterization and Color Analysis

The present paper presents the obtaining and the characterization of a new complex acid dye by combining the transition metal Cu (II) with an azo acid dye, namely Amido Black 10B (C.I. 20.470), as ligand. The ligand and the resulted new azo complex were characterized by FT/IR spectroscopy, UV-Vis spectroscopy, AAs spectrometry, thermal analysis, and PXRD spectrometry. The structure of the ligand and the structure of the new synthesized copper complex were elucidated by all the above mentioned analysis methods. The formation of the azo metal complex with Cu(II) was confirmed by UV-Vis spectrum. Thermogravimetric and spectral analysis reveal its different stability in the air and nitrogen atmosphere, with high nitrogen stability. The PXRD analysis shows crystalline structure for the copper complex. At the same time, the color analysis was performed for the ligand and the synthesized complex in powder by means of UV-Vis CIEL*a*b* color space parameters, under the CIE recommended illuminants: D65 (natural day light), A (incandescent light) and F2 (fluorescent light) under the standard 10� observer angle. An important color phenomenon, namely metamerism, was highlighted for the complex, as well. Due to the presence of the Cu (II) ions, this azo complex presents a different color, calculated by the color differences AE*ab and AC*, a superior saturation and color strength than its ligand.

Adsorption of Amido Black 10B by ZnFe2O4-ZnO Nanopowder

ZnFe2O4 -ZnO nanopowder was synthesized by solution combustion method using zinc nitrate and ferric nitrate as oxidizers and oxalyl dihydrazide as fuel. The nanopowder was characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area measurements. The nanopowder was used as adsorbent for the removal of the dye Amido Black 10B (AB 10) from its aqueous solution. The effect of dosage of the nanopowder and contact time was studied. The results indicated that the nanopowder acted as a good adsorbent for the removal of AB 10. More than 89% removal of the dye was achieved for a catalyst dosage of 0.8g of the nanopowder per liter of the dye solution. The optimum contact time was found to be 40 minutes. Adsorption isotherms and adsorption kinetic models were applied to the adsorption data to know the mechanism and kinetics of adsorption. The adsorption data fitted well for the Langmuir adsorption isotherm and followed pseudo-second order kinetics.

Synthesis and Characterization of PMMA Polymer/Clay Nanocomposites for Removal of Dyes

The adsorbent polymer/clay nanocomposites were prepared by in situ emulsion polymerization method. The prepared adsorbent was characterized using FT-IR, XRD, TGA and the surface morphology was analyzed using FE-SEM. The prepared polymer/clay nano-composite was used for the removal of malachite green and amido black 10B. The effects of initial pH, adsorbent dosage, initial metal ion concentration, contact time and thermodynamic studies on the malachite green and amido black 10B adsorption were studied. The adsorption isotherm parameters of the adsorption process were determined by using Langmuir, Freundlich and Temkin adsorption isotherm equations. The kinetic parameters were predicted with Lagergren’s pseudo-first order and pseudo-second order equations. The effect of temperature of the adsorption process was demonstrated by using the thermodynamic parameters. The maximum adsorption capacity of malachite green and amido black 10B onto polymer/clay nanocomposites was found at pH 7 and 2. Adsorption of malachite green and amido black 10B onto polymer/clay nanocomposites followed the Langmuir adsorption isotherm and it follows pseudo-second order rate constant equation The thermodynamic parameters, such as ΔHº, ΔSº and ΔGº were also determined which suggested that the studied adsorption process was an endothermic reaction.