أ .د سعد عزيز حسن حسـوة

Abstract The adsorption of 1-(2¯- Hydroxy-4¯-nitrophenyl azo) -2-naphthol dye onto the Cement Kiln Dust (CKD) was studied in the temperature range 298-328K. The sorption process was examined in terms of its equilibria and kinetics. Batch adsorption experiments were conducted to evaluate the percentage removal of 1-(2--Hydroxy -4- - nitrophenyl azo)-2-napthol onto CKD waste at operation conditions of sorbate concentration, pH, contact time, sorbent dose. Time-dependent experiments for the removal efficiency required a shortest contact time, i.e , binding to the CKD was rapid and occurred within 25 min. Adsorption isotherms equations were tested for all of Langmuir, Freundlich, Temkin,3 Dobinin- Radushvich, and Elovich. The equilibrium adsorption data were fitted to Freundlich and Temkin isotherms at 298K. Adsorption followed Intra – partical - diffusion rate kinetics. Thermodynamic parameters ΔG*, ΔH*, ΔS* and Ea were computed, and showed that the adsorption process onto CKD was exothermic and non-spontaneous. Also adsorption studies suggest that physisorption might be the major mode of adsorption and CKD expressed as low affinity for removal of 1-(2¯- Hydroxy-4¯-nitrophenyl azo) - 2-naphthol Dye onto the Cement Kiln Dust that the high percentage removal was found ≈50% at 298K , pH=6.

ABSTRACT : Seven chelate complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) metal ions with new azo Schiff(4-(E-((3,5-dichlorophenyl)diazenyl)-2-(((3- (trifluromethyl)phenyl)imino)methyl)phenol (PAPIP) has been prepared from condensation between 4-(3,5-dichlorophenylazo) salcyaldehyde with m-( trifluromethyl) aniline. Organic ligand and its metalized complexes have been characterized by different physico-chemical techniques such as (Mass, 1HNMR and 13CNMR of ligand), elemental analysis, IR, UV-vis spectra, conductance measurement and magnetic susceptibility for all prepare compounds. Based on analytical and spectral data we suggest octahedral geometry of all chelate complexes except Cu(II) complex was appeared tetrahedral geometry.

ABSTRACT Geometry optimization calculations for 5, 5¯-((Pentane-2,4-Diylidene bis (-1-yl-1Yalideneazan)) bis (1,3 ,4- Thiadazole-2-thiol), B, is carried out to establish a dire ct correspondence between experimental and theoretical by using density functional theory (DFT) with B3LYP/6-31G. The theoretical IR and 1H-NMR for the same molecule are performed at the same level of theory. These data suggest that the spectra of the thiadazole are consistent with the thiadazole architecture proposed by Athraa and co-workers. The investigation of HOMO and LUMO approved that this molecule is very suitable to be a semiconductor material because it has a very low energy band gap equal to 0.13628 eV.

ABSTRACT Geometry optimization calculations for (5z,5ˉz)-2,2ˉ- methylene bis (3-(5-mercapto-1 ,3,4Thiadazole-2-yal)-2-(methyl -2,3-dihydro-1,3-oxazepine-4,7-dione), B, is carried out to establish adirect correspondencebetweenexperimental and theoret ical by using density functional theory(DFT) with B3LYP/6-31G. The theoretical IR and 1H-NMR for the same molecule are performedat the same level of theory. These data suggest that the spectra of the thiadazo are consistent withthe thiadazole architecture proposed by Abbas and co-workers. The investigation of HOMO andLUMO approved that this molecule is very suitable to be a semiconductor material because it'shave a very low energy band gap equal to 0.13 628 ev.

ABSTRACT The adsorption of Murexide, Eosin yellowish and Bromo cresol green(BCG) dyes by CKD wascarried out by varying the parameters such as contact time, dye concentration, adsorbent dose, pHand temperature. Adsorption isotherm equations were tested for all of Langmuir, Freundlich, Temkin, Modified Frumkin, Dobinin-Radushvich, Harkins-Jura and Elovich. The equilibriumadsorption data were fitted between Freundlich and Temkin isotherms for Murexide, D-R isothermfor Eosin yellowish and Freundlich for BCG. Adsorption followed pseudo-second-order ratekinetics. The high percentage removal was found ≈ 80.2% at 333K , pH 6 ; ≈ 42% at 303K, pH6; and ≈ 50% at 303K, pH 5 of Murexide, Eosin yellowish and BCG respectively. Thermodynamicparameters ΔG, ΔH, ΔS and Ea were computed ,and showed that the adsorption process onto CKD was endothermic and spontaneous in Murexide adsorption process, while in Eosin yellowishand BCG adsorption was exothermic and spontaneous. Also adsorption studies suggest thatphysisorption might be the major mode of adsorption and CKD expressed as low affinity forremoval of Eosin yellowish and BCG and in general the adsorption process was less affected by temperature

Abstract A study on the use of sudan III dye as corrosion inhibitor for carbon steel ST37-2 in aerated 0.01,0.5x10 5 M H2SO4solutions has been carried out by using potentiodynamic polarization technique. The corrosion parameters such as, corrosion rates, corrosion potential ,corrosion current ,inhibition efficiency and Tafel slopes were evaluated. The effect of temperature on the corrosion behaviour of carbon steel in H2SO4 solutions with and without addition of 5,25,50,100 and 150ppm of sudan III was studied in the temperature range 303-333 K. It was found that sudan III has been proved to be good inhibitor in 0.01 , 0.5x10-5M H2SO4 attaining its highest efficiency, 50% and 99% respectively and though temperature rising. This reduction in the corrosion rate was due to the formation of an external layer formed by sudan III which was adsorbed physically and chemically on the carbon steel ST37-2 surface. Sudan III acted as a mixed type of inhibitor. Values of the activation energies (Ea), enthalpies (ΔH*),Gibbs free energies (ΔG*),entropies of activation (ΔS*),besides the thermodynamic parameters of corrosion and adsorption provided evidence of the inhibitory effect of sudan III. Langmuir isotherm model fitted well the adsorption process onto carbon steel surface in H2SO4 solution