臺灣博碩士論文加值系統

本研究利用萃取劑D2EHPA改質粒狀活性碳(GAC)，以提升活性碳吸附金屬的效率。由控制不同實驗參數找出最佳吸附效率的參數值，利用這些參數值進行動力吸附模式、等溫吸附模式模擬與管柱實驗。
批次式吸附實驗結果顯示平衡時間與最佳吸附效率的pH值分別為12小時與pH 7。動力吸附模式模擬結果顯示，改質後的活性碳(DGAC)與GAC在溫度為25℃，pH值為7的條件下，分別吸附濃度為100及200 mg/L鎘金屬溶液，以擬二階反應模式最符合，其線性回歸R2皆在0.995以上。等溫吸附模式的模擬結果顯示， Langmuir等溫吸附模式最符合，求出的DGAC和GAC最大吸附量各別為21.93與11.44 mg/g。在管柱實驗裡，DGAC無法直接使用，因為pH值是影響吸附能力的主要因素，當pH值下降，吸附效率隨即降低，所以DGAC應用在管柱前，需要先以鈉離子替換DGAC的氫離子，避免pH值下降，影響吸附效率。
最後由批次實驗與管柱測試結果，得知利用D2EHPA改質粒狀活性碳(GAC)，確實可有效提升吸附金屬的能力，對鎘金屬的去除效率可提升約2倍。

GAC was impregnate with D2EHPA (di(2-ethylhexyl) phosphoric acid) dissolved in acetone to enhance its metal adsorption capacity for cadmium removal from aqueous solution. Batch adsorption experiments were conducted under different D2EHPA dosages, temperature, equilibrium time, and pH. According to the experiments results, the equilibrium time, optimum D2EHPA dosages, and optimum pH were found to be 12 hr, 10 g, and 7, respectively. Adsorption processes were found to follow pseudo-second order rate equation at two different initial concentrations of 100 and 200 mg/g. Adsorption isotherms correlate well with the Langmuir isotherm model and the maximum sorption capacity of impregnated GAC for cadmium is 21.93 mg/g.

誌謝 I
中文摘要 II
ABSTRACT III
目錄 IV
圖目錄 VIII
表目錄 XI
第一章、前言 1
1-1 研究緣起與目的 1
1-2 研究內容 3
第二章、文獻回顧 4
2-1 吸附劑改質 4
2-1-1 強酸強鹼氧化改質法 4
2-1-2 硫化物改質法 5
2-1-3 金屬氧化改質法 6
2-1-4 萃取劑浸泡改質法 7
2-1-5 其他改質方法 8
2-2 活性碳吸附鎘金屬的機制 14
2-3 影響活性碳吸附重金屬的因子 15
2-3-1 pH 值的影響 15
2-3-2 活性碳表面面積與官能基的影響 16
2-3-3 其他金屬離子的影響 17
2-3-4 溫度的影響 17
2-4 吸附動力模式 18
2-4-1 擬一階動力吸附模式(Pseudo first-order model) 18
2-4-2 擬二階動力吸附模式(Pseudo second-order model) 19
2-5 等溫吸附模式 20
2-5-1 Langmuir等溫吸附模式 20
2-5-2 Freundlich等溫吸附模式 21
2-6 管柱吸附 23
2-7 再生 24
第三章、材料與方法 25
3-1 實驗材料與設備 25
3-1-1 實驗材料 25
3-1-2 實驗設備 28
3-2 實驗步驟 32
3-2-1 吸附測試 32
3-2-2 溶出測試 32
3-2-3 不同pH值 33
3-2-4 動力吸附實驗 33
3-2-5 等溫吸附實驗 33
3-2-6 管柱實驗 34
3-2-7 批次式再生實驗 34
3-2-8 再生與再利用實驗 34
3-3 分析方法與干擾去除 35
3-3-1 總鎘分析 35
3-3-2 TOC分析 35
3-3-3 比表面積分析 35
3-3-4 氯鹽檢測方法 36
第四章、結果與討論 37
4-1 活性碳改質 37
4-1-1 不同改質方法對吸附鎘金屬之影響 37
4-1-2 不同D2EHPA添加量對吸附鎘金屬之影響 38
4-1-3 烘乾時間對DGAC吸附鎘金屬之影響 41
4-2 吸附鎘金屬之影響 43
4-2-1 反應時間 43
4-2-2 pH值對活性碳吸附鎘金屬之影響 47
4-2-3 等溫吸附曲線 48
4-2-4 動力吸附模式 51
4-3 再生批次實驗 57
4-4 管柱實驗 58
4-4-1 管柱吸附 58
4-4-2 管柱吸附之再生與重覆使用 59
第五章、結論與建議 64
5-1 結論 64
5-2 建議 65
參考文獻 66

圖目錄
Figure 1. Speciation diagram of cadmium, TOTCd = 10-3 M. 16
Figure 2. Linear isotherm of Freundilch model. 22
Figure 3. Schematic of glass reactor. 29
Figure 4. Schematic of column reactor. 30
Figure 5. The effects of impregnation method on Cd removal and the amount of D2EHPA dissolution. Solute test: DGAC=20 g/L. Adsorbent test: GAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Initial pH =5.7. Reaction time = 30 min. Shaking speed = 150 rpm. Particle size = 0.71~1.41 mm. 38
Figure 6. The effects of D2EHPA dosage on Cd removal and the amount of D2EHPA attachment. GAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Reaction time = 30 min. Particle size = 0.71~1.41 mm. Error bars are one standard deviation from the mean for triplicate experiments. 39
Figure 7. SEM image of GAC and DGAC : (a) GAC, (b) DGAC (10 g D2EHPA), (c) DGAC (20 g D2EHPA). Magnification = 3000×. 40
Figure 8. Plot of different dosage of D2EHPA versus BET. Red line is the BET of GAC. 41
Figure 9. The effects of drying time on Cd removal and the amount of D2EHPA attachment. GAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Reaction time = 2 hr. Fixed pH = 7.0. Error bars are one standard deviation from the mean for triplicate experiments. 42
Figure 10. The effects of drying time on BET and micropore volume. 43
Figure 11. Cd(II) removal efficiency as a function of reaction time for GAC and DGAC. GAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Fixed pH = 7.0. Error bars are one standard deviation from the mean for triplicate experiments. 44
Figure 12. (a) Cd(II) removal efficiency as a function of reaction time for GAC and DGAC. (b) Plot of pH versus reaction time for GAC and DGAC. GAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Initial pH = 7. Particle size = 0.71~1.41 mm. Error bars are one standard deviation from the mean for triplicate experiments. 46
Figure 13. Cd(II) removal efficiency as a function of reaction time for DGAC under various pH conditions. DGAC = 10 g/L. Initial Cd(II) concentration = 100 mg/L. Particle size = 0.71~1.41 mm. Error bars are one standard deviation from the mean for triplicate experiments. 48
Figure 14. Adsorption isotherm for DGAC. Fixed pH = 7.0. Reaction time = 12 hrs. 49
Figure 15. Adsorption isotherm for GAC. Fixed pH = 7.0. Reaction time = 6 hrs. 49
Figure 16. Plot of adsorbed amount versus reaction time for Cd at various initial concentrations and different GAC. 52
Figure 17. Pseudo-first-order kinetics for Cd onto GAC. GAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 53
Figure 18. Pseudo-first-order kinetics for Cd onto DGAC. DGAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 53
Figure 19. Pseudo-second-order kinetics for Cd onto GAC. GAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 55
Figure 20. Pseudo-second-order kinetics for Cd onto DGAC. DGAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 55
Figure 21. Pseudo-second-order kinetics for Cd onto GAC within 20 min. GAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 56
Figure 22. Pseudo-second-order kinetics for Cd onto DGAC within 20 min. DGAC = 10 g/L. Initial Cd(II) concentration = 100 and 200 mg/L. Fixed pH = 7.0. 56
Figure 23. Comparision between qe obtained from pseudo-second order model and Langmuir isotherms model. 57
Figure 24. DGAC regenerated by various regenerants. DGAC = 10 g/L. 58
Figure 25. Breakthrough curves for Cd adsorption onto DGAC. Influent Cd(II) concentration = 100 mg/L. Influent pH = 7. Internal diameter = 1.8 cm. Depth = 69.5 cm. EBCT = 10 min. 59
Figure 26. Breakthrough curves for Cd adsorption onto DGAC. Influent Cd(II) concentration = 100 mg/L. Influent pH = 7. Internal diameter = 1.8 cm. Depth = 69.5 cm. EBCT = 10 min. 61
Figure 27. Breakthrough curves for Cd adsorption onto DGAC. Influent Cd(II) concentration = 100 mg/L. Influent pH = 7. Internal diameter = 1.8 cm. Depth = 69.5 cm. EBCT = 10 min. 62
Figure 28. Breakthrough curves for Cd adsorption onto DGAC. Influent Cd(II) concentration = 100 mg/L. Influent pH = 7. Internal diameter = 1.8 cm. Depth = 69.5 cm. EBCT = 10 min. 63
Figure 29. Scheme of the preparation coated DGAC. 65

表目錄
Table 1. Summary of sorption density of various adsorbents. 11
Table 2. Summary of sorption density of various adsorbents (continued). 12
Table 3. Summary of sorption density of various adsorbents (continued). 13
Tabel 4. Physico-chemical properties of F-300 GAC. 25
Table 5. Reagents used in this study. 27
Table 6. Langmuir and Freundlich isotherms parameter(25℃). 50
Table 7. Data of Langmuir isotherms model in different initial concentration. 51
Table 8. Pseudo second-order parameter. 54
Table 9. Cd adsorbed on DGAC in different regeneration cycles. 61

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