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題 名 | 顆粒活性碳液相吸附硝酸鹽氮之動力模式探討=On the Study of Nitrate Adsorption Removal Process in Solution using Modified Granular Active Carbon |
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作 者 | 孫志誠; 王瑞彥; 翁崇銘; | 書刊名 | 永達學報 |
卷 期 | 7:1 民95.06 |
頁 次 | 頁41-49 |
分類號 | 445.463 |
關鍵詞 | 顆粒活性碳; 吸附; 硝酸氮; 動力模式; 酸化改質; Granular active carbon; Adsorption; Nitrate; Kinetic model; Acidic modify; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究應用顆粒狀活性碳進行液相中硝酸鹽氮之吸附去除,顆粒狀活性碳經由酸化改質,由吸附效率及溶液中各種陰離子之濃度變化,瞭解改質之效果。改質後之活性碳吸附動力模式驗證亦一併探討。實驗結果顯示,硝酸鹽氮溶液在濃度50 mg NO₃¯-N/L及總體積1升的條件下,以25克活性碳進行液相吸附時,未經酸化改質處理之活性碳,其單位活性碳之吸附量為0.9 mg NO₃¯-N/g,但經酸化處理後,可提升至1.7mg NO₃¯-N/g,提升約1.8倍。由吸附溶液中之陰離子分析可知,未經酸化處理之活性碳吸附之陰離子主要為硫酸根,吸附進行時溶液中之硝酸鹽氮與吸附於活性碳上之硫酸根進行置換,以達硝酸鹽氮之吸附去除。再者,溶液陰離子分析數據更顯示,酸化處理之活性碳上吸附之陰離子主要為氯離子,溶液中之硝酸鹽氮與吸附於活性碳上之氯離子進行置換。酸化改質之活性碳吸附數據經帶入擬一階、二階吸附方程式以及顆粒內質傳等動力模式作圖與計算得知,擬二階吸附動力模式,線性做圖所得之R²值皆為0.999。由擬二階吸附模式所得之單位活性碳之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3.5%。此結果更可證實擬二階吸附模式可用以表達此吸附系統。 |
英文摘要 | The nitrate removal in solution using granulated active carbon was discussed in this study. The effects of acidic modified granulated active carbon on the adsorption efficiency were proven by the variation of anion concentration in solution. The test of adsorption kinetic models was also studied. The experimental results indicate that the amount of adsorption at equilibrium of unmodified and modified active carbon were 0.9 mg NO₃¯-N/g and 1.7mg NO₃¯-N/g, respectively, the amount of adsorption at equilibrium was promoted to about 1.8 times, under the condition of 25g active carbon adding to the one liter solution with the concentration of 50mg NO₃¯-N/L. The analysis of anion in adsorption solution indicate that the sulfate was the major anion in unmodified active carbon adsorption system, the sulfate adsorbed on the unmodified active carbon was displaced by the nitrate in solution. In addition, the anion analysis also indicate that the chloride was the major anion in modified active carbon adsorption system, the chloride adsorbed on the modified active carbon was displaced by the nitrate in solution. The adsorption data of modified 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-second-order equation can exactly describe the nitrate adsorption, and the R-square are all equal to about 0.999. The amount of adsorption at equilibrium calculated from pseudo-second-order equation (q□)□ was fitted to the experimental data (q□)□, the average normalized standard deviation △q was 3.5%. This result can verify the fact that the pseudo-second-order model can express this adsorption system. |
本系統中英文摘要資訊取自各篇刊載內容。