Removal of low-concentration ammonia in water by ion-exchange using Na-mordenite.
Removal of low-concentration ammonia in water by ion-exchange using Na-mordenite.
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DOI：
10.1016/j.watres.2006.10.035
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发表时间：
2007
期刊：
影响因子：
12.8
通讯作者：
Yi Wang;Yuichi Kmiya;T. Okuhara
中科院分区：
文献类型：
--
作者：
Yi Wang;Yuichi Kmiya;T. Okuhara
Removal of low-concentration ammonia (2–10ppm) in water by ion exchange with Na-form zeolites was investigated using a flow system at 278–333K. Results indicated that Na-mordenite was the most efficient cation-exchanger (compared with Na-ferrierite, Na-ZSM-5, Na-β, and Na-Y, as well as the K- and H-form mordenite) for the removal of low-concentration ammonia. The ammonia uptake and the ion-exchange level achieved using mordenite with NH4+for removal of 10ppm ammonia at 333K were 1.21mmolg−1and 79.1%, respectively. The high efficiency of Na-mordenite for removal of low-concentration ammonia in water is due to the strong acidity of the corresponding H-form mordenite as demonstrated by ammonia temperature-programmed desorption. Ammonia uptake on the Na-mordenite was minimally influenced by operating temperature in the range of 278–333K. The coexistent K+and Na+in water had little influence on ammonia uptake of the Na-mordenite. In contrast, coexistent Ca2+and Mg2+significantly lowered the efficiency of the Na-mordenite for ammonia removal.
