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حذف نیترات از محلول‌هاى آبى با استفاده از میکرو و نانو ساختار برگ درخت راش | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 6، دوره 51، شماره 2، اردیبهشت 1399، صفحه 353-362 اصل مقاله (944.23 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.276857.668135 | ||
| نویسندگان | ||
| طیبه دهقان1؛ محمد علی غلامی سفیدکوهی* 1؛ مجتبی خوش روش2؛ نرگس صمدانی لنگرودی3 | ||
| 1دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| 2گروه مهندسی آب، دانشکده مهندسی زراعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| 3گروه شیمی/ دانشگاه گلستان | ||
| چکیده | ||
| نیترات یکی از آلاینده‌های عمده‌ای است که به‌طور گسترده در منابع آبی بسیاری از کشورها وجود دارد که منجر به بروز مشکلات زیست محیطی می‌شود. در این پژوهش با استفاده از سیستم ناپیوسته، حذف نیترات از محلول‌های آبی توسط میکرو و نانو ذرات برگ درخت راش مورد بررسی قرار گرفت. پس از تهیه و اصلاح جاذب‌ها، تاثیر اسیدیته محلول، زمان تماس و مقدار جاذب بر جذب نیترات بررسی شد. به‌منظور مدل‌سازی فرایند جذب از مدل‌های سینتیک و ایزوترم جذب استفاده شد. نتایج نشان داد که اسیدیته و مقدار بهینه جاذب برای حذف نیترات توسط میکرو و نانوجاذب برگ راش به‌ترتیب 3 و 10 گرم در لیتر می‌باشد. زمان تعادل برای میکروجاذب برگ راش 120 دقیقه و برای نانوجاذب برگ راش 90 دقیقه به‌دست آمد. از بین مدل‌های سینتیک، مدل سینتیک هو و همکاران برای میکروجاذب و مدل سینتیک لاگرگرن برای نانوجاذب بهترین برازش را داشته است. مقایسه مدل لانگمویر نشان داد که بیشینه ظرفیت جذب برای نانوجاذب برگ راش (69/16 میلی‌گرم بر گرم) بیشتر از میکروجاذب برگ راش (68/10 میلی‌گرم بر گرم) است. یافته‌ها نشان داد که نانو ذرات برگ راش توانایی بیشتری در حذف نیترات از محلول‌های آبی دارد. | ||
| کلیدواژه‌ها | ||
| آزمایش ناپیوسته؛ ایزوترم جذب؛ برگ؛ سینتیک جذب؛ نانوجاذب | ||
| عنوان مقاله [English] | ||
| Nitrate Removal from Aqueous Solutions Using Micro and Nano Particles of Beech Leaves | ||
| نویسندگان [English] | ||
| Tayebe dehghan1؛ Mohammad Ali Gholami Sefidkouhi1؛ Mojtab Khoshravesh2؛ narges samadani3 | ||
| 1sari university | ||
| 2Dept. of Water Eng., Faculty of Agricultural Eng., Sari Agricultural Sciences and Natural Resources University | ||
| 3Department of chemist/Golestan University | ||
| چکیده [English] | ||
| Nitrate is a major contaminant that is extensively found in water resources in many countries, leading to environmental problems. In this study, a batch system was used to study the removal of nitrate from aqueous solutions by micro and nanoparticles of beech leaves. After the preparation and modification of adsorbents, the effect of soluble pH, contact time, and dosage of adsorbent on nitrate adsorption were investigated. Kinetic and isotherm adsorption models were used to study the adsorption process. The results showed that the optimum pH and adsorbent dosage for nitrate removal by micro and nanoadsorbent of beech leaves were 3 and 10 g/L, respectively. Equilibrium time for micro and nanoadsorbent beech leaves was obtained 120 and 90 minutes, respectively. Among the kinetic models, Ho ̓s pseudo-second-order for the micro adsorbent and the Lagergren ̓s pseudo-first-order kinetic model for the nanoadsorbent had the best fit to the experimental data. According to the Langmuir model, the maximum adsorption capacity for nanoadsorbent beech leaves (16.69 mg/l) was higher than the micro adsorbent beech leaves (10.68 mg/l). The results showed that the nanoadsorbent of beech leaves are more capable for nitrate removal from aqueous solutions than the microadsorbrnt. | ||
| کلیدواژه‌ها [English] | ||
| Batch experiment, Isotherm adsorption, Kinetic adsorption, Leaf, Nano adsorbent | ||
| مراجع | ||
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