期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 166, 期 2-3, 页码 1014-1019出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2008.12.001
关键词
Natural zeolite; Hydrothermal synthesis; Cation exchange capacity; Zeolite Na-P; Ammonium uptake
The Chinese natural zeolite, in which clinoptilolite coexists with quartz was treated hydrothermally with NaOH solutions, either with or without fusion with NaOH powder as pretreatment. Zeolite Na-P, Na-Y and analcime were identified as the reacted products, depending on the reaction conditions such as NaOH concentration, reaction time and hydrothermal temperature. The products were identified by X-ray diffraction, and characterized by Fourier transform IR and ICR With hydrothermal treatment after fusion of natural zeolite with NaCH, high purity of zeolite Na-Y and Na-P can be selectively formed, their cation exchange capacity (CEC) are 275 and 355 meq/100g respectively, which are greatly higher than that of the natural zeolite (97 meq/100 g). Furthermore, the ammonium removal by the synthetic zeolite Na-P in aqueous solution was also studied. The equilibrium isotherms have been got and the influence of other cations present in water upon the ammonia uptake suggested an order of preference Ca(2+) > K(+) > Mg(2+). (C) 2008 Elsevier B.V. All rights reserved.
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