الفهرس | Only 14 pages are availabe for public view |
Abstract Chapter 1, the introduction: The first chapter is the introduction in which an outline on the importance of nano materials and their applications in different fields is presented. This chapter also includes a literature survey on the previous work performed on the removal of different organic pollutants from water samples. Chapter 2, the experimental: This chapter includes complete description of the materials and methods used for the preparation of the nanosized mono oxides of magnesium, zirconium and MgO-ZrO2 mixed nanooxides. This chapter also describes the instrument used in characterization of the prepared samples such as thermogravimetric – differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier Transform Infrared spectra (FTIR) and UV-Visible spectrophotometer. Chapter 3, results and discussion: This chapter contains the discussion of the results obtained and their analysis which can be summarize as follows: The oxides were prepared by titration of 50 ml of 0.1 M hydrated magnesium acetate, zirconyl chloride or both of them DROP by DROP to 50 ml of 0.2 M of different organic acids viz. oxalic, tartaric, citric, succinic, malic, malonic and glycine, respectively, in 1: 2 M ratio. The powder so obtained was annealed at 750oC for six hours in muffle furnace to obtain the corresponding nanosized magnesium oxides. The prepared nanoparticles were characterized as follows: 1- TGA/DTA analysis showed that the organic precursors degrade through three steps; the first represents the dehydration of physically adsorbed water molecule 113 while the second represents the dehydration of water of crystallization while the third represents the decomposition of the organic metal precursors to the corresponding nanosized metal oxide (MgO). 2- FTIR spectra of the organic acids and glycine precursors, showed the presence of bands characteristic to νOH, νC=O, δOH and νM-O.The first three bands disappeared in the spectra of the calicinated samples with the appearance of the bands corresponding to the stretching vibrations of the metal oxide. 3- The XRD patterns of magnesium, zirconium and mixed magnesium – zirconium nanooxides showed the presence of MgO (cubic) and the orthorhombic type phase of zirconium oxide |