Dissertation > Excellent graduate degree dissertation topics show

Nano Fe_2O_3 Mn_2O_3 its mixture of surface acid-base properties and adsorption behavior

Author: WuZhenSheng
Tutor: SunZhongXi
School: Jinan University
Course: Inorganic Chemistry
Keywords: Ferric oxide Manganese oxide Cadmium(II) potentiometric titration coordination constant s Arsenic(V)
CLC: O647.31
Type: Master's thesis
Year: 2010
Downloads: 62
Quote: 0
Read: Download Dissertation

Abstract


Iron and manganese are common variable valence elements in nature. In the sedimentary environment, the natural Iron and manganese oxides and hydroxides with surface charges is typical of the potential oxidant. Iron and manganese oxides as well as hydroxide minerals are very active constituents in soils because they are sensitive to environmental changes and they could control the availability of many nutrients and the toxicity of heavy metals.Fe2O3 and Mn2O3 nanoparticles were synthesized by precipitation method. Powder X-ray diffraction （XRD）, and nitrogen adsorption-desorption, transmission electron microscopy （TEM） analysis methods were used to characterize the crystal graphic, structure, morphology and the specific surface area. And we made preliminary analysis about its solubility in aqueous solution, then we found that Iron oxides makes manganese oxides more stable in their mixtures. According to the experimental data of acid base titration of mesoporousα-Fe2O3 suspention, using FITEQL computer software and Constant Capacitance Model （CCM）, the protonation and deprotonation constants of Fe2O3 and Mn2O3 were determined. Base on the acid-base constants the adsorption of heavy metal ions （Cd2+） at the surfaces of Fe2O3 and Mn2O3 was studied as a function of different pH. The solution components were distributed using computer soft ware MEDUSA and the surface complexation constants of Cd2+ at the surfaces were determined using computer software WinSGW. We calculated the free energies of adsorption reaction through the constants of Fe2O3 and Mn2O3 which belongs to the scope of chemical adsorption.The adsorption of As（V） at the surfaces of Fe2O3 and Mn2O3 was studied as a function of different pH and initial concentrations of As（V）. The results showed that Fe2O3 and Mn2O3 and its mixture have a very strong adsorption capacity for As（V）, which can be used to remove the As（V） ions in waste water. The experimental data from different As（V） initial concentration of the adsorption fitted the Langmuir equation and obtain the maximum adsorption capacity. The type of its adsorption complexes was analysed by testing Zeta potential.

Related Dissertations

  1. Research on Influnce of Silicon and Sulfur on Arsenic Uptake and Accumulation of Rice (Oryza Sativa L.),S511
  2. Synthesis and Pre-Treated of Schwertmannite and Its Efficiency of Arsenic Removal from Simulated Groundwater,X703
  3. Effects of Arsenic Trioxide on the Proliferation, Apoptosis and the Expression of BMP-2 Gene in Osteoblasts Cultured in Vitro,R363
  4. Ozone pre-oxidation and coagulation combined process of removal of arsenic in drinking water,R123.1
  5. Cyclin D1, CDK4, P16 and Rb gene in arsenic -induced malignant transformation process HaCaT cells Expression and significance,R739.5
  6. Slurry-sampling Hydride Generation Atomic Spectrometry for Speciation Analysis of Trace Arsenic,TS207.5
  7. Performance and Mechanism of Simultanious Removal of Cr(Ⅵ) and As(Ⅴ) by Fe(Ⅱ) from Contaminated Water,TU991.2
  8. Experimental Research of Chemically Modified Chitosan for Mercury and Arsenic Removal from Flue Gas,X701
  9. Valuable Iron Recycling in High Arsenic Acid Waste Water,X703
  10. The Effect of Arsenic Trioxide on Invasion, Metastasis of Human Ovarian Cancer Cell Line SKOV3,R737.31
  11. Role of Plant Growth Promoting Rhizobacteria in Phytoremediation of Arsenic Contaminated Soils,X53
  12. Preparation of La2/3Ca1/3MnO3/Zn1-xCoxO Composites and Their Electronic and Magnetic Properties,O482.5
  13. In Vitro Study of Combination of Tanshinone with Arsenic Trioxide Induced Differentiation and Apoptosis of Acute Promyelocytic Leukemia Cells,R733.71
  14. Modified attapulgite and its adsorption behavior of high arsenic in drinking water research,TU991.2
  15. Study on Forming Particularity of High Arsenic Coals in Southwestern of Guizhou Province,P618.11
  16. Wet Recovery of gold mine tailings arsenic test,TD926.4
  17. As the natural purification mechanism of high arsenic coal mine waste water in the presence of Fe (Ⅲ),X703
  18. Preparation of Zeolite Modified by Pfs and Its Ability for Arsenic，fluoride Removal,TU991.2
  19. Catalytic Oxidation of arsenic sulfide,X70
  20. Natural purification mechanism and reaction kinetics of arsenic in high arsenic coal acidic wastewater system,X703

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > The physical chemistry of surface phenomena > Adsorption > Adsorption theory
© 2012 www.DissertationTopic.Net  Mobile