Dissertation > Excellent graduate degree dissertation topics show

Effects of Amounts of Surface Coatings on the Adsorption Rates of Cd to Natural Surface Coatings

Author: QiuLiMin
Tutor: DongDeMing；LiYu
School: Jilin University
Course: Environmental Science
Keywords: natural surface coatings Cd adsorption rate
CLC: X52
Type: Master's thesis
Year: 2005
Downloads: 57
Quote: 0
Read: Download Dissertation

Abstract


Natural surface coatings composed of microorganisms, oxideminerals and many other things are the composite solids existingwidely in the natural aquatic environments, and they occur on all kindsof solid surfaces and affect the behaviors of heavy metals significantly.Therefore, the aim of this research work focused on the effects ofamounts of surface coatings on the adsorption rates of Cd to naturalsurface coatings.Freshwater surface coatings were developed in Nanhu Lake, JilinProvince, P. R. China. Glass slides were fixed in the device designedfor collecting surface coatings, then submerged in water at a depth of30cm for 19 days. Concentrations of ferric oxides, manganese oxidesand organic materials in the surface coatings were quantified.Adsorption data of Cd to surface coatings whose amount ranged fromone piece to five pieces was obtained in MMS solutions with thedifferent Cd original concentration (2.0μmol·L-1 and 3.5μmol·L-1).During this procedure, the temperature of the system was maintainedat 25℃and pH at 6.0±0.1. The solution was sampled at certain timesduring the adsorption process. The model of Elovich and doubleconstant kinetic equations were employed to investigate the adsorptionprocess of Cd. Meanwhile, the relation of the amounts of surfacecoatings and the rate of Cd adsorption to natural surface coatings wasanalyzed.The results showed that the amount of surface coatings affectedthe Cd adsorption to surface coatings. When the amount of surfacecoatings ranged from one pieces to three pieces, the Cd adsorption tosurface coatings increased with the amount of surface coatings greatly.When the amount of surface coatings ranged from four pieces to fivepieces, the Cd adsorption to surface coatings increased with theamount of surface coatings less. Therefore, the amount of surfacecoatings could not increase the Cd adsorption infinitely with the sameCd original concentration. Correlation analysis between logC and t showed that there’ssignificant relationship between them. Both the Elovich equation andthe double constant kinetic equation could fit the kinetic data of Cdadsorption to surface coatings whose amount ranged from one piece tofive pieces with the different original concentration. It showed that the rate of Cd adsorption to surface coatingsincreased with the amount of surface coatings. The rate of Cdadsorption to surface coatings increased with the amount of surfacecoatings greatly when there were a few surface coatings. However, theincrease of the adsorption rate was limited when there were moresurface coatings. The result showed that when the initial concentrations of solutionwere defined (2.0μmol·L-1/3.5μmol·L-1), increasing the amount ofsurface coatings was an effective approach to improve Cd adsorption.While the adsorptive rates of per unit surface coatings for Cddecreased with the amount of surface coatings. When the initial

Related Dissertations

  1. Establishment of ELISA for Detecting Cd-MT of Pteria Penguin and Preliminary Study of ELISA-kit,X835
  2. Responses of Alocasia macrorrhiza to Different Water Stresses and Pollutants Exposures,X52
  3. Research on the Interface Modification of Epoxy Resin/Metallic Substrates and Epoxy Resin/Pigment,TQ630.1
  4. Effects of Different Water Management Methods on Cadimium Uptake and Translocation by Rice with Different Grain Accumulation Characteristics,S511
  5. Studies on the Effects of Exogenous Nitric Oxide on Rice under Cadmium Stress,S511
  6. The Proteomics Analysis of Response to Cadmium Stress in Radish (Raphanus Sativus L.),S631.1
  7. Molecular Diagnosis for Changes of Methylation of MLH1 Promoter of Arabidopsis Thaliana Induced by Cadmium Stress,X173
  8. Increased Cd and Cu Accumulation and Heavy Metal-tolerance of Plants by ACC-deaminase Producing Bacteria and the Mechanisms,X172
  9. Molecular Recognition Based on β-cyclodextrin and Chemical Modified β-cyclodextrin as Receptor,O636.12
  10. Electrochemical Studies on Interaction between ApoCopC、BSA and Cu(Ⅱ)、Cu(Ⅰ)、Cd(Ⅱ)、Ag(Ⅰ),O646
  11. Effects and Mechanism of Exasa on the Growth of Rapeseed Exposed to CD,S565.4
  12. Rat hepatoma evolution of three biochemical factors and related drugs Intervention,R735.7
  13. Complexes of two iodine three Allylthiourea together Synthesis and Characterization of cadmium,O627
  14. Different Soil Texture Cd, Pb stress on the physiological effects of wheat growth,S512.1
  15. Preparation and Luminous Property of Tm and Dy Doped YSZ Coating,TG174.442
  16. Study on the Preparation of Ursolic Acid /β- Cyclodextrin Inclusion Complex by Ultrahigh Pressure,TQ461
  17. Polyester ion exchange fabrics Preparation and adsorption theory and performance,TS156
  18. Development and Application of Insulation-Colling Coating for Outdoor Textile,TQ630.7
  19. Research of Readout Signal Modeling and Simulation Based on Next-generation Versatile Disc,TP333.4
  20. Study on Digital Baseband of RFID System Based on ARM,TP391.44
  21. Effects of TNF-α on the Transcytosis of Ldl Accross Vascular Endothelial Cells and the Underlying Mechanism,R965

CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
© 2012 www.DissertationTopic.Net  Mobile