کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
584534 | 1453184 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ammonium exchange in aqueous solution using Chinese natural clinoptilolite and modified zeolite
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
In this study, the Chinese natural clinoptilolite (sample 1) was fused with sodium hydroxide prior to hydrothermal reaction, and it was transformed to modified zeolite Na-Y (sample 2). The uptake of ammonium ion from aqueous solutions in the concentration range 50-250 mg NH4+/l on to the two samples was compared and the equilibrium isotherms have been got. The influence of other cations present in water upon the ammonia uptake was also determined. The cations studied were potassium, calcium and magnesium. In all cases the anionic counterion present was chloride. The results showed that sample 2 exhibited much higher uptake capacity compared with sample 1. At the initial concentration of 250 mg NH4+/l, the ammonium ion uptake value of sample 2 was 19.29 mg NH4+ gâ1 adsorbent, while sample 1 was only 10.49 mg NH4+ gâ1 adsorbent. For the natural clinoptilolite, the effect of the metal ions suggested an order of preference K+ > Ca2+ > Mg2+. These contrasted with the modified zeolite, where the order appeared to be Mg2+ > Ca2+ > K+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 142, Issues 1â2, 2 April 2007, Pages 160-164
Journal: Journal of Hazardous Materials - Volume 142, Issues 1â2, 2 April 2007, Pages 160-164
نویسندگان
Y.-F. Wang, F. Lin, W.-Q. Pang,