碩士 / 長庚大學 / 化工與材料工程研究所 / 94 / Abstract
The thesis contents are research of the adsorption isotherms and kinetics of adsorption of As3+ and As5+ on corals of different particle size(6/8 mesh, 8/20 mesh), and on activated carbons modified by CuSO4 and Ag2SO4, denoted as Cu/C and Ag/C. In addition, the research content also includes examinations of break through curves of adsorption of As5+ on corals and activated carbons in packed bed, and that of copper ions on ion exchangers by Wheeler equation and linear driving force model.
Calculating the experimental data of adsorption of As3+ and As5+ in batch systems, the adsorption capacity of As3+ and As5+ on corals(6/8 mesh) are 0.0396 mmol/g and 0.0360 mmol/g, while that on corals(8/20 mesh) 0.0407 mmol/g and 0.0450 mmol/g, respectively. From the above result, the adsorption capacity of smaller particle size is larger than that of bigger one. The adsorption capacity of As3+ and As5+ on Cu/C are 0.321 mmol/g and 0.29 mmol/g, while that on Ag/C are 0.35 mmol/g and 0.30 mmol/g. From the above result, the adsorption capacity of Ag/C is larger than Cu/C. Comparing effective diffusion coefficient of As3+ and As5+ on corals(6/8 mesh, 8/20 mesh) and Cu/C, Ag/C, De of As3+ and As5+ on corals are the lowest, ranging from 1.78×10-8 to 7.03×10-8 cm2/sec, while that of As5+ on Cu/C the highest, ranging from 3.07×10-7 to 3.60×10-7 cm2/sec. In adsorption isotherm calculations, Langmuir isotherm is suitable for adsorption of As3+ on Cu/C and Ag/C, while Freundlich isotherm for that of As5+ on Cu/C and Ag/C.
In examination of adsorption of As5+ on Cu/C, Ag/C, and corals(6/8 mesh) in packed bed, we use Wheeler equation and linear driving force model. From the regression result by Wheeler equation, the adsorption capacity of As5+ on Cu/C is 0.00716 g/g , the highest. From the simulation by linear driving force model, adsorption of As5+ on corals(6/8 mesh) has the best matching result between experimental and theoretical data.
In examination of adsorption of Cu2+ on ion exchangers in packed bed, we use Wheeler equation and linear driving force model. From the regression results by Wheeler equation, the average adsorption capacity of Cu2+ on ion exchangers is 0.0872 g/g. From the simulation by linear driving force model, there are three important parameters to regulate. These are equilibrium constant, adsorption capacity, and effective diffusion coefficient. By doing so, the experimental and theoretical data would match well. The values of equilibrium constant, adsorption capacity, and effective diffusion coefficient are set to be 15000 l/mol, 0.6 mol/l, and 4×10-7 cm2/sec, respectively.
| Identifer | oai:union.ndltd.org:TW/094CGU00063072 |
| Date | January 2006 |
| Creators | Shui-Wei Chen, 陳秀偉 |
| Contributors | Tsan-Sheng Lu, 盧贊生 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 98 |
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