Dissertation > Excellent graduate degree dissertation topics show

Study on the Preparation of Functionalized Graphene and Adsorption of Heavy Metal and Methylene Blue

Author: DengXiaoJiao
Tutor: LuoFang
School: Northeast Normal University
Course: Inorganic Chemistry
Keywords: Graphene electrolysis functionalize adsorption lead cadmium methylene blue
CLC: O647.3
Type: Master's thesis
Year: 2011
Downloads: 254
Quote: 0
Read: Download Dissertation

Abstract


Graphene which is 2D carbon nanomaterial with SP2 carbon atoms has attracted enormous scientific attentions in chemical and physical domains since it was detected in 2004. It has many excellent properties, its theoretical specific area is 2630 m2g-1, and its excellent mobility of charge carriers and high thermal conductivity are 15 000 cm2V-1s-1 and 5300 W/mK respectively, it also has high values of its Young’s modulus (1100 GPa) and fracture strength (125 GPa). Graphene has many potential applications in computer, solar cells, super capacitors, biological technology, catalysis, composite materials and so on due to its excellent properties. There are many synthesis methods of graphene, the main methods are micromechanical cleavage, chemical vapour deposition (CVD), epitaxial growth and graphite redox methods.In this paper, the functionalized graphene (GNSPF6) was fabricated by simple and fast method of electrolysis with potassium hexafluorophosphate solution as electrolyte under the static potential of 15 V. The characterization results of transmission electron microscopy, atom force microscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, Raman spectroscopy and Thermogravimetric analysis indicate that graphite rod was exfoliated completely to graphene layer containing 30 wt % PF6~- with the average thickness is ca. 1.0 nm.Our sample of GNSPF6 was developed for the removal of Pb(Ⅱ) or Cd(Ⅱ) ions from water, and the determined adsorption capacities are 406.6 mg/g (pH=5.1) for Pb(Ⅱ) and 73.42 mg/g (pH=6.2) for Cd(Ⅱ), which is much higher than that by our previous sample of GNSC8P and carbon nanotube. The adsorption processes reach equilibrium in just forty minutes and the adsorption data are described well by Langmuir and Freundlich classical isotherms models.The adsorption property of methylene blue (MB) onto functionalized graphene (GNSPF6) is investigated as well. The researches show that the adsorption amount increases with the increase of pH, as well as temperature which suggesting that the adsorption process is endothermic in our investigation. The adsorption process reaches equilibrium in 60 min, and the regression results show that pseudo-second-order kinetic model provides a better correlation than pseudo-first-order. The typical Langmuir and Freundlich models describe the experiment data well. Meanwhile, the maximum adsorption capacity of MB onto GNSPF6 is 374.4 mg/g obtained from Langmuir model at 20 oC.

Related Dissertations

  1. Density Functional Theory Study of Dimethyl Ether Adsorption on the Low-Index Pt Surface,O485
  2. Preparation of Based on the Phenolic Resin of Activated Carbon and Adsorption-Photopcatalytical Character of Supported TiO2,TQ424.19
  3. Research on Geological Features of Yinchanggou-Qiluogou Lead-Zinc Ore Deposit, Ningnan County, Sichuan Province,P618.4
  4. Studies on Synthesis, Characterization and Properties of Fe-V Co-doped TiO2 Catalyst,O614.411
  5. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  6. Under microaerobic conditions closed calcium carbide furnace exhaust COS gas adsorption purification,X781
  7. Study on the Accumulation and Remove of Cadmium and Lead in Oysters,X174
  8. Study on the Synthesis and Adsorption Behaviour of Chitosan Derivative,TS254.9
  9. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  10. Optimization Design Andapplication of Extracting Methods of Maize (Zea Mays L.) Volatile Compounds,S513
  11. The Study of Lead Exposure on Cyprinus Carpio Ovary Epithelial Cells,X174
  12. Cadmium, Chromium and Lead Accumlation, Distribution in Aralia Elata Var. Inermia and Their Effect on Leaf Antioxidative System,S792
  13. Responses of Alocasia macrorrhiza to Different Water Stresses and Pollutants Exposures,X52
  14. Synthesis and Study on Graphene and Co3O4/Graphene Composite about the Characteristics of Electrochemistry,O613.71
  15. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  16. Cloning and Expression of Responsive Genes Related to Cadmium Stress in Radish (Raphanus sativus L.),S631.1
  17. Effect of Cadmium Stress and Sulfur Deficiency on Non-Protein Thiol Content and Glutathione S-Transferase Activity in Rice,S511
  18. Syntheses, Structures and Properties of Metal-organic Frameworks Based on Dicarboxylate Ligands,O621.13
  19. Effects of Added Maize Straw and Citric Acid on Cu and Cd Availability in Soil,X131.3
  20. Synthesis and Pre-Treated of Schwertmannite and Its Efficiency of Arsenic Removal from Simulated Groundwater,X703
  21. The Research of Fast Integrated Physicochemical Technology for Emergent Treatment of Organic Contamination Accidents,X703

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