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بررسی سینتیک و همدمای جذب نیترات و آمونیوم از محلول آبی با استفاده از زغال زیستی نی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 14، دوره 50، شماره 8، دی 1398، صفحه 2009-2021 اصل مقاله (947.98 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| شیلا خواجوی شجاعی1؛ عبدالامیر معزی* 2؛ مجتبی نوروزی مصیر3؛ مهدی تقوی زاهد کلائی4 | ||
| 1دانشجوی دکتری، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 2دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 3استادیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 4استادیار گروه شیمی- دانشکده علوم- دانشگاه شهید چمران اهواز- اهواز- ایران | ||
| چکیده | ||
| نیترات و آمونیوم از آلایندههای مهم اکوسیستمهای آبی هستند که سبب ایجاد غنی شدن منابع آبی میشوند. استفاده از جاذبهای طبیعی، ارزان و دوستدار محیط‌زیست میتواند راهکار مناسبی برای حذف نیترات و آمونیوم از محیطهای آبی باشد. هدف از این پژوهش، بررسی توانایی زغال زیستی گیاه نی (Phragmites australis) در جذب نیترات و آمونیوم از محلول آبی بود. برای این کار، زغال زیستی نی در دمای 500 درجه سلسیوس تهیه و ویژگیهای آن اندازهگیری شد. آزمایشهای جذب سطحی و تأثیر برخی از پارامترهای مؤثر بر فرایند جذب نیترات و آمونیوم بهوسیله زغال زیستی نی شامل غلظت اولیه، زمان تماس، pH و مقدار زغال زیستی، به‌صورت پیمانهای بررسی شد. جذب نیترات و آمونیوم توسط زغال زیستی نی به‌ترتیب پس از گذشت 480 و 240 دقیقه به تعادل رسید. pH بهینه در حذف نیترات و آمونیوم به‌ترتیب برابر 3 و 9 بود. کارایی حذف نیترات و آمونیوم با افزایش زمان تماس و مقدار جاذب افزایش یافت. مدل سینتیک شبه درجه دوم توصیف مناسبی از فرایند جذب آمونیوم (99/0r2 =) و نیترات (97/0r2 =) ارائه داد. مدلهای لانگمویر (99/0r2 =) و فروندلیچ (99/0r2 =) به‌ترتیب بهترین برازش را برای دادههای آمونیوم و نیترات نشان دادند. به‌طورکلی نتایج این پژوهش نشان‌دهنده توانایی بالای زغال زیستی نی برای جذب نیترات (5/73 میلیگرم بر گرم) و آمونیوم (6/42 میلیگرم بر گرم) بود. بنابراین زغال زیستی نی پس از جذب نیترات و آمونیوم بهدلیل ظرفیت مناسب در تأمین بخشی از نیتروژن موردنیاز گیاهان، پتانسیل خوبی به‌عنوان یک اصلاح‌کننده خاک دارد. | ||
| کلیدواژه‌ها | ||
| جاذب آلی؛ جذب سطحی؛ زغال زیستی نی؛ نیتروژن؛ همدما | ||
| عنوان مقاله [English] | ||
| Study of Ammonium and Nitrate Adsorption Kinetics and Isotherm by Common reed (Phragmites australis) Biochar from Aqueous Solution | ||
| نویسندگان [English] | ||
| Shila Khajavi-Shojaei1؛ Abdolamir Moezzi2؛ Mojtaba Norouzi Masir3؛ Mehdi Taghavi zahedkolaei4 | ||
| 1Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 2Associate Professor, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 3Assistant Professor, Department of Soil Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 4Assistant Professor, Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| چکیده [English] | ||
| Nitrate and ammonium are the major contaminants of aquatic ecosystem causing eutrophication in water resources. Application of natural, inexpensive and ecofriendly adsorbents can be a useful approach for ammonium and nitrate removal from aqueous solutions. The aim of this study was to investigate the ability of common reed biochar to absorb nitrate and ammonium from aqueous solution. For this purpose, the common reed biochar was prepared at 500°C and its characteristics were measured. The effect of initial concentration, contact time, pH and biochar dosage on nitrate and ammonium adsorption was studied using batch experiment. Adsorption of nitrate and ammonium by biochar reached to equilibrium after 480 and 240 minutes, respectively. The optimal pH for removal of nitrate and ammonium was 3 and 9, respectively. The efficiency of nitrate and ammonium removal increased with increasing contact time and dose of biochar. The pseudo second order kinetic model provides a good description for the adsorption process of ammonium (r2=0.994) and nitrate (r2 =0.970). Langmuir and Freundlich isotherms showed the best fit for ammonium and nitrate experimental data, respectively. Generally, the common reed biochar showed a high capacity for adsorption of nitrate (73.52 mg g-1) and ammonium (42.55 mg g-1). Therefore, the exhausted adsorbents containing ammonium and nitrate has a good potential as a soil conditioner that can supply part of plant''s need to nitrogen. | ||
| کلیدواژه‌ها [English] | ||
| Adsorption, Common reed biochar, Isotherm, nitrogen, Organic adsorbent | ||
| مراجع | ||
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