| URN | etd-0726111-135943 | Statistics | This thesis had been viewed 599 times. Download 0 times. |
| Author | Xin-Hong Pan | ||
| Author's Email Address | No Public. | ||
| Department | hazards | ||
| Year | 2010 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 60 |
| Title | Study of the Adsorption Efficiency of Activated Bentonite for Methylene Blue | ||
| Keyword | |||
| Abstract | The objective of this study is to activate bentonite by sulfuric acid to enhance the adsorption performance of bentonite. Several Experiments were carried out, including: 1. To measure the specific surface area for both raw bentonite and activated bentonite by using brunauer emmett teller (BET) measurements, 2. To observe the difference of bentonite surface by using scanning electron microscopy (SEM), 3. To understand the characteristics of adsorption for on thermodynamics and kinetics Activation of the bentonite for both raw bentonite and activated bentonite by using basic dye Methyleneblue (MB) as a solute. The result indicated that the surface area of 76.11 m2/g was for the raw bentonite whereas the activated bentonite had the surface area of 116.131 m2/g. From SEM figures, we found that the surface of bentonite after activation significantly increased the fold. It was inferred that Fe3 +, Ca2 +, Mg2 +, Na + and other cations in montmorillonite crystal layer of bentonite had been replaced by hydrogen ions. From experiments of kinetic study, the adsorption rate constants for MB bentonite were increased by temperature after bentonite was activated whereas they were not increased by pH value and concentration of MB. From experiments of thermodynamic study, adsorption reactions of MB for both raw bentonite and activated bentonite were irreversible and endothermic reactions, and they were physical adsorptions. The results also showed that the adsorption reactions of MB for raw bentonite was a non-spontaneous reaction (ƒ´G0> 0) whereas they were spontaneous reaction (ƒ´G0 <0) for activated bentonite. Regarding to isotherm experiments, the results indicated that the phenomena of adsorption for raw bentonite could be described by Langmuir theory whereas they were more suitable for Freundlich theory for activated bentonite. |
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| Advisor Committee | |||
| Files | indicate not accessible | ||
| Date of Defense | 2011-06-24 | Date of Submission | 2011-07-26 |