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حذف نیترات با استفاده از سنگدانه‌های پامیس پوشش داده شده با نانو ذرات زئولیت اصلاح شده توسط سورفکتانت کاتیونی از محلول‌های آبی سنتتیک | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 19، دوره 50، شماره 8، دی 1398، صفحه 2073-2083 اصل مقاله (1021.12 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.276803.668134 | ||
| نویسندگان | ||
| زینب میخک بیرانوند1؛ سعید برومند نسب* 2؛ عبدالرحیم هوشمند3 | ||
| 1دانشجوی دکترا، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 2استاد، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 3دانشیار، گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| چکیده | ||
| بالا بودن نیترات در منابع آبی باعث مشکلات بهداشتی و زیست‌محیطی متعددی می‌گردد. به همین منظور در این پژوهش از تثبیت نانو ذرات زئولیت اصلاح شده توسط سورفکتانت کاتیونی بر روی بستر سنگدانه‌های پامیس جهت حذف نیترات مازاد از محلول‌های آبی استفاده گردید. نانو ذرات زئولیت پس از اصلاح توسط سورفکتانت CTAB بر روی بستر سنگدانه‌های پامیس تثبیت و مشخصات فیزیکی و ساختاری جاذب آماده شده با تکنیک‌های XRD، EDAX و SEM بررسی گردید. در این تحقیق از روش سطح پاسخ بر مبنای طراحی باکس بنکن جهت ارزیابی اثر متغیرهای مستقل pH (5-9)، دما (15-45 درجه سانتی گراد) و مقدار جاذب (5-15 گرم) بر عملکرد پاسخ و همچنین پیشبینی بهترین مقدار پاسخ استفاده شد. نتایج نشان داد که حداکثر راندمان حذف نیترات در شرایط بهینه پیشبینی شده توسط مدل (دمای 34 درجه، pH برابر با 5 و مقدار جاذب 15 گرم) برابر با 26/52 درصد بود. همچنین با افزایش مقدار جاذب و زمان تماس میزان حذف نیترات افزایش یافت در حالی که با افزایش pH و غلظت اولیه نیترات راندمان حذف آن کاهش پیدا کرد. در نهایت نتایج نشان داد که سنگدانه‌های پامیس پوشش داده شده با نانوذرات زئولیت می‌تواند به عنوان جاذب موثر و در عین حال قابل دسترس برای حذف آلاینده‌ها مورد استفاده قرار بگیرد. | ||
| کلیدواژه‌ها | ||
| حذف نیترات؛ پامیس اصلاح شده؛ طراحی باکس بنکن | ||
| عنوان مقاله [English] | ||
| Nitrate Removal Using Pumice Aggregate Coated with Zeolite Nanoparticles Modified by Cationic Surfactant from Synthetic Aqueous Solutions | ||
| نویسندگان [English] | ||
| zeinab mikhak beiranvand1؛ saeed boroomand nasab2؛ Abdolrahim hooshmand3 | ||
| 1Ph.D. student, Department of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran. | ||
| 2Professor, Department of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 3Associate Professor, Department of Irrigation and Drainage, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| چکیده [English] | ||
| High nitrate concentration in water resources leads to many health and environmental problems. In this study, stabilization of the zeolite nanoparticles modified by cationic surfactant was applied on the pumice bed to remove excess nitrate from aqueous solutions. Zeolite nanoparticles, following modification by CTAB surfactant, were stabilized on the substrate of pumice aggregate and their physical and structural characteristics were investigated by XRD, EDAX, and SEM analyses. In this research, the response surface method based on the Box-Behnken model was used to evaluate the effects of independent variables pH (5-9), temperature (15-45 ºC), and adsorbent dosage (5-15 g) on the response function and to predict the best response value. The results revealed that the maximum nitrate removal efficiency predicted by the model was 52.26 % in optimal conditions (temperature 34°C, pH 5 and adsorbent amount of 15 g). Also, the nitrate removal rate was increased by increasing the adsorbent dosage and contact time, while the removal efficiency decreased with increasing pH and initial nitrate concentration. The study showed that the modified pumice aggregates could be used as an effective and economical adsorbent for removal of pollutants. | ||
| کلیدواژه‌ها [English] | ||
| Nitrate Removal, Modified Pumice, Box Behnken | ||
| مراجع | ||
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