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題名 | 顆粒活性碳酸性溶液中吸附亞硝酸鹽氮之動力模式探討=Kinetic Modeling Study on the Nitrite Adsorption in Acidic Solution Using Granular Active Carbon |
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作者 | 孫志誠; 王瑞彥; 游志輝; | 書刊名 | 永達學報 |
卷期 | 8:1 2007.06[民96.06] |
頁次 | 頁9-17 |
分類號 | 460.025 |
關鍵詞 | 顆粒活性碳; 吸附; 亞硝酸氮; 動力模式; Granular active carbon; Adsoption; Nitrite; Kinetic model; |
語文 | 中文(Chinese) |
中文摘要 | 本文應用顆粒狀活性碳,進行酸性溶液中亞硝酸鹽氮之吸附去除。顆粒狀活性碳在酸性溶液中可改變表面之帶電情形,經由溶液中亞硝酸鹽氮離子之濃度變化以及吸附效率之計算,瞭解其對吸附提昇之效果。實驗結果顯示,以25克活性碳進行酸性溶液中液相吸附時,溶液在濃度20 mg NO₂¯-N/L及總體積2升的條件下,亞硝酸鹽氮之起始去除速率為2.57 mg NO₂¯-N/min,其單位活性碳之吸附量為0.51 mg NO₂¯-N/g,而酸性溶液中未加活性碳之起始去除速率僅為0.12 mg NO₂¯-N/min。另外,活性碳吸附亞硝酸鹽氮動力模式驗證程序中,酸性溶液中活性碳吸附數據經帶入擬一階、二階吸附動力方程式以及顆粒內質傳等動力模式作圖與計算得知,擬一階吸附動力模式與顆粒內質傳動力模式,-線性作圖所得之R²值皆大於0.96。由擬一階吸附動力模式所得之單位活性碳之亞硝酸鹽氮吸附量計算值q□(□),與由實驗數據所得之q□(□)值極為符合,其平均△q值為7.50%。此結果更可證實擬一階吸附動力模式可用以表達此吸附系統。 |
英文摘要 | The adsorption removal of nitrite in acidic solution using granular active carbon was discussed in this study. According to the analysis of anion concentrations and the calculation of adsorption efficiency, the surface of active carbon was modified, and the adsorption efficiency was promoted in acidic solution. The experimental results indicate that the initial removal rate was 2.57 mg NO₂¯-N/min, and the amount of adsorption at equilibrium was 0.51 mg NO₂¯-N/g, under the condition of 25 g active carbon added to the two liter acidic solution with the concentration of 20 mg NO₂¯-N/L. but the initial removal rate was just 0.12 mg NO₂¯-N/min without the applying of active carbon. In addition, the test of adsorption kinetic models was also studied. The adsorption data of active carbon were fitted using the kinetic models of pseudo-first-order, pseudo-second-order, and intraparticle diffusion equations. The fitting validity of these models can be check by linear plot and calculation of adsorption parameters. The pseudo-first-order and intraparticle diffusion equations can exactly describe the nitrite adsorption, and the R-square are all higher than 0.96. The amount of adsorption at equilibrium calculated from pseudo-first-order equation (q□)□ was fitted to the experimental data (q□)□, the average normalized standard deviation △q was 7.50%. This result can verify the fact that the pseudo-first-order model can express this adsorption system. |
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