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《Journal of Safety and Environment》 2001-01
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NEW APPLICATIONS OF ZEOLITES FOR ENVIRONMENT PROTECTION

ZHU Jian-hua,WANG Ying &XU Yang (College of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210093, China)  
Progresses in the applications of zeolites on environment protection are reviewed, especially on the removal of N-nitrosamines from the cigarette smoke and beer, purification of waste water and novel compound fertilizer as well as water-retaining materials in soils.It is shown that strong interaction exists between zeolites and N-nitrosamines and the TPSR spectra of NDMA on Nay,NaZSM-5 and HZSM-5 zeolites as well as NPYP on zeolites and molecular sieves is seen in Figs. 2 and 3. Addition of zeolite in cigarette could remove N-nitrosamines of 60% to 70% from the main-smoke, while around 40% to 50% from the side-smoke without any change in the taste of the cigarette. Since the dispersed zeolite forms an especial in situ catalysis and/or absorption layer on tobacco, pollution of N-nitrosamines in the smoke is thus suppressed, because the N-nitrosamines should contact with the zeolite layer. When N-nitrosamines contacts the zeolite at high temperature, they can be catalytically decomposed. If N-nitrosamines contacts the zeolite at a relatively low temperature, they will be strongly absorbed in the zeolite without escaping. As a result, the health of both smokers and non-smokers is protected at the same time, which will be a novel way to exclude the pollution of cigarette smoke.There are other applications of zeolites and these are reviewed in the paesent paper. First,the special absorption function of zeolite make it become an important component in the novel fertilizer. Second,after mixed with polymer materials, zeolite could be used as functional material for keeping the moisture of soil. The variation of the moisture of soil before and after the addition of zeolites (5 wt. %) with time for different zeolites is illustrated and is seen in Figs. 4-6.
【CateGory Index】: X703
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