摘要
以天然斜发沸石为研究对象,通过不同温度及时间梯度焙烧改造天然斜发沸石,重点研究了焙烧改造后沸石结构特征的变化以及对再生水中氨氮去除性能的影响.结果表明:在适宜的焙烧温度和时间下,天然斜发沸石因孔道内部水分及杂质脱除,比表面积增大,而晶体结构和孔径分布特征无明显变化,且阳离子交换容量并不增加,但对水中氨氮去除率由53.15%提高到72.13%;而过高温度及过长时间的焙烧改造沸石,导致沸石特征衍射峰减弱,骨架结构出现坍塌,比表面积与阳离子交换容量大幅下降,孔径分布特征变化明显,对水中氨氮的去除率明显下降.
The natural clinoptilolite as the object of study, which were modified by roasting at different temperature and time gradient, the changes of structural characteristics and ammonia- nitrogen removal ability in recycled water for zeolite after roasting modification were studied emphatically. The results showed that specific surface of zeolite increased, crystal structure, pore size distribution and cation exchange capacity of zeolite changed slightly, but ammonium-nitrogen removal rates increased from 53. 15% to 72. 13% , because of the remove of water and impurity in the pore channel for natural clinoptilolite in the suitable roasted temperature and time. While the zeolite roasted in overtemperature and excessive time, characteristic diffraction peak of natural zeolite became weaker, the framework collapsed, specific surface area and cation exchange capacity decreased dramatically, pore size distribution changed significantly, and ammonium- nitrogen removal ability decreased significantly.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第12期1778-1782,共5页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(51174017)
关键词
天然沸石
焙烧改造
孔径分布
氨氮
比表面积
natural zeolite
roasting modification
pore size distribution
ammonium-nitrogen
specific surface area
