近年來隨著科技的發展，污水中含氮廢棄物的處理成為主流的議題。而活性碳在污水處理中被廣泛的使用。
本研究利用活性碳吸附水溶液中氨氮與雙氧水，並分別探討活性碳劑量、初始溶液pH值、初始反應物濃度以及雙氧水與反應物濃度比等變因對反應物去除之影響。
以活性碳吸附氨氮與雙氧水水溶液之系統中，溶液pH值為影響反應最重要之因素。由於氨氮與雙氧水的酸解離常數(pKa)分別為9.3及11.6，活性炭的零電位點(pHpzc)為7.63，因此溶液pH值的改變會分別影響水溶液中氨氮、雙氧水的物種分布情形以及活性碳表面電荷。本實驗研究結果顯示，氨氮在鹼性條件下吸附量增加，而在酸性與中性條件下氨氮吸附量不佳；而雙氧水在溶液pH值大於11時，移除效率隨之增加。
本研究初步認為，以活性碳處理水溶液中氨氮與雙氧水，其最適條件為：活性碳劑量=20 g/L，初始溶液pH=9。在此操作條件下，反應120分鐘後，水溶液中氨氮吸附量可達6.06 mg/g。
最後，本研究亦發現，雙氧水會影響活性碳對於氨氮的吸附。水溶液中加入雙氧水同樣會被活性碳移除，但氨氮的移除則不具有顯著效果。可能原因是活性碳與雙氧水反應速率遠大於活性碳與氨氮反應，因此雙氧水不利於氨氮被活性碳吸附。

Water and wastewater treatment has become a major social, technological, economical, and political problem in recent years such as pollution of nitrogenous pollutants in wastewater. Activated carbon (AC) has been recognized as one of the most popular and widely used adsorbent in water and wastewater treatment throughout the world.
Adsorption of ammonium and hydrogen peroxide in aqueous solution by activated carbon was studies under various activated carbon dosage, initial solution pH, initial ammonium concentration and concentration of hydrogen peroxide to ammonium ratio.
For ammonium, hydrogen peroxide and activated carbon, the initial solution pH was a significant factor to affect the removal of ammonium. It is attributed to ammonium and hydrogen peroxide could decompose in aqueous solution with the pKa values of 9.3 and 11.6, respectively. Activated carbon also with the pHpzc values of 7.63. Results showed that the adsorption of ammonium was found to be enhanced under alkaline condition, whereas there were a few ammonium removals under acidic and neutral conditions. On the other hand, the hydrogen peroxide was enhanced when the pH value above 11.
In this study, the optimum operating conditions for adsorption of ammonium by activated carbon was as follows: activated carbon dosage 20 g/L, initial solution pH 9. According to the conditions, the maximum adsorption capacity of ammonium is 6.06 mg/g after 120 minutes.
Finally, Hydrogen peroxide would influence the adsorption of ammonium in aqueous solution by activated carbon. Results showed that the adsorption of hydrogen peroxide has no influence, but almost no ammonium had been adsorbed. This result would be explained activated carbon reacted with hydrogen peroxide prior to activated carbon reacted with ammonium.

Adebisi, G. A., Chowdhury, Z. Z., and Alaba, P. A., “Equilibrium, Kinetic, and Thermodynamic Studies of Lead Ion and Zinc Ion Adsorption form Aqueous Solution onto Activated Carbon Prepared from Palm Oil Mill Effluent,” J. Clean Prod., Vol. 148, pp. 958-968 (2017).
Arena, N., Lee, J., and Clift, R., “Life Cycle Assessment of Activated Carbon Production from Coconut Shells,” J. Clean Prod., Vol. 125, pp. 68-77 (2016).
Bhatnagar, A., Hogland, W., Marques, M., and Sillanpaa, M., “An Overview of the Modification Methods of Activated Carbon for Its Water Treatment Applications,” Chem. Eng. J., Vol. 219, pp. 499-511 (2013).
Boehm, H. P., “Some Aspects of the Surface Chemistry of Carbon Blacks and Other Carbons,” Carbon, Vol. 32, No. 5, pp. 759-769 (1994).
Boopathy, R., Karthikeyan, S., Mandal, A. B., and Sekaran, G., “Adsorption of Ammonium ion by Coconut Shell-activated carbon from Aqueous Solution: Kinetic, Isotherm, and Thermodynamic Studies,” Environ. Sci. Pollut. Res., Vol. 20, pp. 533-542 (2013).
Choi, K. J., Kim, S. G., Kin, C. W., and Kim, S. H., “Effect of Activated Carbon Types and Service Life on Removal of Endocrine Disrupting Chemicals: Amitrol, Nonylphenol, and Bisphenol-A,” Chemosphere, Vol. 58, pp. 1535-1545 (2005).
Dakubo, F., Baygents, J. C., and Farrell, J., “Hydrogen Peroxide Removal from Chemical-Mechanical Planarization Wastewater,” IEEE Trans. Semicond. Manuf., Vol. 25, No. 4, pp. 623-629 (2012).
Dalal, R. C., “Effect of Associated Anions on Ammonium Adsorption by and Desorption from Soils,” J. Agric. Food Chem., Vol. 23, No. 4, pp. 684-687 (1975).
Daverey, A., Su, S. H., Huang, Y. T., and Lin, J. G., “Nitrogen Removal From Opto-Electronic Wastewater using the Simultaneous Partial Nitrification, Anaerobic Ammonium Oxidation and Denitrification (SNAD) Process in Sequencing Batch Reactor,” Bioresour. Technol., Vol. 113, pp. 225-231 (2012).
Foo, K. Y., and Hameed, B. H., “Insights into the Modeling of Adsorption Isotherm Systems,” Chem. Eng. J., Vol. 156, pp. 2-10 (2010).
Georgi, A., and Kopinke, F. D., “Interaction of Adsorption and Catalytic Reactions in Water Decontamination Processes Part I. Oxidation of Organic Contaminants with Hydrogen Peroxide Catalyzed by Activated Carbon,” Appl. Catal. B-Environ., Vol. 58, pp. 9-18 (2005).
Gesikiewicz-Puchalska, A., Zgrzebnicki, M., Michalkiewicz, B., Narkiewicz, U., Morawski, A. W., and Wrobel, R. J., “Improvement of CO2 Uptake of Activated Carbon by Treatment with Mineral Acids,” Chem. Eng. J., Vol. 309, pp. 159-171 (2017).
Goertzen, S. L., Theriault, K. D., Oickle, A. M., Tarasuk, A. C., and Andreas, H. A., “Standardization of the Boehm Titration. Part I. CO2 Expulsion and Endpoint Determonation,” Carbon, Vol. 48, pp. 1252-1261 (2010).
Goswami, M., and Phukan, P., “Enhanced Adsorption of Cationic Dyes using Sulfonic Acid Modified Activated Carbon,” J. Environ. Eng., Vol. 5, pp. 3508-3517 (2017).
Gratuito, M. K. B., Panyathanmaporn, T., Chumnanklang, R. A., Sirinuntawittaya, N., and Dutta, A., “Production of Activated Carbon from Coconut Shell: Optimization using Response Surface Methodology,” Bioresour. Technol., Vol. 99, pp. 4887-4895 (2008).
Hamdaoui, O., and Naffrechoux, E., “Modeling of Adsorption Isotherms of Phenol and Chlorophenols onto Granular Activated Carbon Part I. Two-Parameter Models and Equations Allowing Determination of Thermodynamic Parameters,” J. Hazard. Mater., Vol. 147, pp. 381-394 (2007).
Hameed, B. H., Ahmad, A. L., and Latiff, K. N. A., “Adsorption of Basic Dye (Methylene Blue) onto Activated Carbon Prepared from Rattan Sawdust,” Dyes Pigment., Vol. 75, pp. 143-149 (2007).
Hameed, B. H., Din, A. T. M., and Ahmad, A. L., “Adsorption of Methylene Blue onto Bamboo-based Activated Carbon: Kinetics and Equilibrium Studies,” J. Hazard. Mater., Vol. 141, pp. 819-825 (2007).
Hu, X., Zhang, H., and Sun, Z., “Adsorption of Low Concentration Ceftazidime from Aqueous Solutions using Impregnated Activated Carbon Promoted by Iron, Copper and Aluminum,” Appl. Surf. Sci., Vol. 392, pp. 332-341 (2017).
Ioannidou, O., and Zabaniotou, A., “Agricultural Residues as Precursors for Activated Carbon Production,” Renew. Sust. Energ. Rev., Vol. 11, pp. 1966-2005 (2007).
Jorgensen, T. C., and Weatherley, L. R., “Ammonia Removal from Wastewater by Ion Exchange in the Presence of Organic Contaminants,” Water Res., Vol. 37, pp. 1723-1728 (2003).
Kang, Y., Guo, Z., Zhang, J., Xie, H., Liu, H., and Zhang, C., “Enhancement of Ni(II) Removal by Urea-modified Activated Carbon Derived from Pennisetum Alopecuroides with Phosphoric Acid Activation,” J. Taiwan Inst. Chem. Eng., Vol. 60, pp. 335-341 (2016).
Kurniawan, T. A., and Lo, W. H., “Removal of Refractory Compounds from Stabilized Landfill Leachate using an Integrated H2O2 Oxidation and Granular Activated Carbon (GAC) Adsorption Treatment,” Water Res., Vol. 43, pp. 4079-4091 (2009).
Li, T. W., “Treatment of Nitrogenous Substances in Aqueous Solution by UV/H2O2 Process,” Master’s Thesis, National Taiwan University of Science and Technology, Taiwan Taipei (2016).
Li, Y. H., “Adsorption and Desorption Study of Isopropyl Alcohol Aqueous Solution with Activated Carbon in the Fixed-bed Column,” Master’s Thesis, National Taiwan University of Science and Technology, Taiwan Taipei (2018).
Liao, H. R., “Adsorption and Desorption Study of Isopropyl Alcohol on Activated Carbon in Aqueous Solution,” Master’s Thesis, National Taiwan University of Science and Technology, Taiwan Taipei (2017).
Lin, S. S., and Gurol, M. D., “Catalytic Decomposition of Hydrogen Peroxide on Iron Oxide: Kinetics, Mechanism, and Implications,” Environ. Sci. Technol., Vol. 32, pp. 1417-1423 (1998).
Liu, H., Dong, Y., Wang, H., and Liu, Y., “Ammonium Adsorption from Aqueous Solution by Strawberry leaf Powder: Equilibrium, Kinetics and Effects of Coexisting Ions,” Desalination, Vol. 263, pp. 70-75 (2010).
Liu, S. X., Chen, X., Chen, X. Y., Liu, Z. F., and Wang, H. L., “Activated Carbon with Excellent Chromium(VI) Adsorption Performance Prepared by Acid-base Surface Modification,” J. Hazard. Mater., Vol. 141, pp. 315-319 (2007).
Lopez-Ramon, M. V., Stoeckli, F., Moreno-Castilla, C., and Carrasco-Marin, F., “On the Characterization of Acidic and Basic Surface Sites on Carbons by Various Techniques,” Carbon, Vol. 37, pp. 1215-1221 (1999).
Oliveira, L. C. A., Silva, C. N., Yoshida, M. I., and Lago, R. M., “The Effect of H2 Treatment on the Activity of Activated Carbon for the Oxidation of Organic Contaminants in Water and the H2O2 Decomposition,” Carbon, Vol. 42, pp. 2279-2284 (2004).
Ooi, C. H., Cheah, W. K., Sim, Y. L., and Pung, S. Y., “Conversion and Characterization of Activated Carbon Fiber Derived From Palm Empty Fruit Bunch Waste and its Kinetic Study on Urea Adsorption,” J. Environ. Manage., Vol. 197, pp. 199-205 (2017).
Qiu, H., Lv, L., Pan, B. C., Zhang, Q. J., Zhang, W. M., and Zhang, Q. X., “Critical Review in Adsorption Kinetic Models,” J. Zhejiang Univ.-SCI A, Vol. 10, No. 5, pp. 716-724 (2009).
Rivera-Utrilla, J., Sanchez-Polo, M., Gomez-Serrano, V., Alvarez, P. M., Alvim-Ferraz, M. C. M., and Dias, J. M., “Activated Carbon Modifications to Enhance its Water Treatment Applications,” J. Hazard. Mater., Vol. 187, pp. 1-23 (2011).
Sekar, M., Sakthi, V., and Rengaraj, S., “Kinetics and Equilibrium Adsorption Study of Lead (II) onto Activated Carbon Prepared from Coconut Shell,” J. Colloid Interface Sci., Vol. 279, pp. 307-313 (2004).
Shafeeyan, M. S., Ashri Wan Daud, W. M., Houshmand, A., and Shamiri, A., “A Review on Surface Modification of Activated Carbon for Carbon Dioxide Adsorption,” J. Anal. Appl. Pyrolysis, Vol. 89, pp. 143-151 (2010).
Srivastava, V. C., Swamy, M. M., Mall, I. D., Prasad, B., and Mishra, I. M., “Adsorptive Removal of Phenol by Bagasse Fly Ash and Activated Carbon: Equilibrium, Kinetics and Thermodynamics,” Colloid Surf. A-Physicochem. Eng. Asp., Vol. 272, pp. 89-104 (2006).
Tan, I. A. W., Hameed, B. H., and Ahmad, A. L., “Equilibrium and Kinetic Studies on Basic Dye Adsorption by Oil Palm Fibre Activated Carbon,” Chem. Eng. J., Vol. 127, pp. 111-119 (2007).
Wang, W., Deng, S., Li, D., Ren, L., Shan, D., Wang, B., Huang, J., and Wang, Y., “Sorption Behavior and Mechanism of Organophosphate Flame Retardants on Activated Carbons,” Chem. Eng. J., Vol. 332, pp. 286-292 (2018).
Zheng, W., Hu, J., Rappeport, S., Zheng, Z., Wang, Z., Han, Z., Langer, J., and Economy, J., “Activated Carbon Fiber Composites for Gas Phase Ammonia Adsorption,” Microporous Mesoporous Mat., Vol. 234, pp. 146-154 (2016).
Zhong, L., Li, W., Zhang, Y., Norris, P., Cao, Y., and Pan, W. P., “Kinetic Studies of Mercury Adsorption in Activated Carbon Modified by Iodine Steam Vapor Deposition Method,” Fuel, Vol. 188, pp. 343-351 (2017).