Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54053#.VOBT2SzQrzE Author(s)   Pedro Oliver Dunstan Affiliation(s) Instituto de Química, Universidade Estadual de Campinas, Campinas, Brazil . ABSTRACT Complexes of the general formula [MBr 2 (TMTU)n] (where M is Mn, Fe, Co, Ni, Cu, Zn or Cd; TMTU is Tetramethylthiourea; n is 0.75, 2 or 3) were obtained by the reaction of salts and ligand in solution. The bromides were selected among several other salts because they had thermochemical data in the literature. Properties as capillary melting points; C, H, N, Br and metal contents; TG/DTG and DSC curves; and IR and electronic spectra were determined. The values of several thermodynamic parameters for the complexes were found by solution calorimetry. From them, the standard enthalpies of the metal-sulphur coordinated bonds were calculated. The standard enthalpies of the formation of the gaseous phase addu...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53966#.VN2pyyzQrzE Author(s)   Sabri M. Husssein 1 , Omar H. Shihab 2 , Sattar S. Ibrahim 1 , Naser M. Ahmed 3*   Affiliation(s) 1 Department of Chemistry, College of Science, University of Anbar, Anbar, Iraq . 2 Department of Chemistry, College of Women Education, University of Anbar, Anbar, Iraq . 3 Nano-Optoelectronics Research and Technology Laboratory, School of Physics, University Sains Malaysia, Penang, Malaysia . ABSTRACT Interaction between kaolin (particle size 53 and 106 μm) and urea was studied by infrared spectroscopy and powder X-ray diffraction. Interaction was found to be dependent on the particle size of kaolin raw material. Nature of interaction achieved through the formation of hydrogen bonds between urea and both AlOH and Si-O surface of kaolinite. Effect of temperature on equilibrium adsorption of methylene blue (MB) from aqueou...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53019#.VLR7LcnQrzE Author(s)    Mohamed Erhayem 1 , Fatima Al-Tohami 1 , Ragwan Mohamed 2 , Khadija Ahmida 1   Affiliation(s) 1 Department of Chemistry, Faculty of Science, Sebha University, Sebha, Libya . 2 Department of Chemistry, Faculty of Science, Sirte University, Sirte, Libya . ABSTRACT The present work deals with the equilibrium adsorption of Hg(II) onto carbonized Rosmarinus officinalis leaves (ACROL) as a new adsorbent from aqueous solution and it has been investigated. ACROL samples were prepared by physical carbonization at 773 K for 1 h. Titration method was used to determine the concentration of Hg(II) before and after adsorption onto ACROL by ethylenediaminetetraacetic acid, EDTA, as chelating agent. Batch equilibrium studies were carried out under different experimental conditions such as Hg(II) concentration and temperature. The r...