کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9633075 | 1425878 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization and environmental application of a Chilean natural zeolite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Characterization and environmental application of a Chilean natural zeolite Characterization and environmental application of a Chilean natural zeolite](/preview/png/9633075.png)
چکیده انگلیسی
The use of natural zeolites for environmental applications is gaining new research interests mainly due to their properties and significant worldwide occurrence. The present work describes the characterization of a natural Chilean zeolite and the results as adsorbent for ammonia from aqueous solutions. The zeolitic-rich tuff sample, mainly composed of clinoptilolite and mordenite, consisted of 13 μm mean volumetric particle diameter, 55 m2 gâ1 (methylene blue adsorption) and 177 m2 gâ1 (nitrogen adsorption) of specific surface area. Particles were negatively charged over a broad pH range (with or without ammonia) and 1.02 meq NH4+ gâ1 cation-exchange capacity. The ammonia removal appears to proceed through ion-exchange and rapid kinetics (rate constant of 0.3 minâ1) at neutral pH value, with removal capacities up to 0.68 meq NH4+ gâ1. The Langmuir isotherm model provided excellent equilibrium data fitting (R2=0.97). Results indicate a significant potential for the Chilean natural zeolite as an adsorbent/ion-exchange material for wastewater treatment and water reuse applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mineral Processing - Volume 75, Issues 1â2, 6 January 2005, Pages 21-29
Journal: International Journal of Mineral Processing - Volume 75, Issues 1â2, 6 January 2005, Pages 21-29
نویسندگان
A.H. Englert, J. Rubio,