حذف نیترات از محلول آبی با زئولیت کلینوپتیلولیت اصلاح‌شده
محورهای موضوعی : شیمی کاربردی
آزاده جدائی
1
,
اعظم آفاقی
2
,
داریوش یوسف پور
3
1 - گروه شیمی دانشگاه ازاد صوفیان
2 - گروه علوم پایه دانشگاه ازاد اسلامی صوقیان
3 - کارمند اداره استاندارد
کلید واژه: زئولیت طبیعی کلینوپتیلولیت, مس اکسید, آهن اکسید, حذف سدیم نیترات.,
چکیده مقاله :
یون‌های نیترات به دلیل حلالیت بالا در آب به‌عنوان تهدیدی جدی برای منابع آب سطحی و زیرزمینی بشمار می روند. بنابراین، حذف آن‌ها از منابع آبی لازم است. برای حذف نیترات از آب روش‌های زیادی وجود دارد که از ساده‌ترین آن‌ها می‌توان به حذف آن ها با جاذب‌هایی مانند زئولیت‌ها اشاره کرد. در این کار پژوهشی، ذره هایی از مس اکسید و آهن اکسید بر زئولیت طبیعی کلینوپتیلولیت شهر میانه نشانده شد. ویژگی‌های فیزیکی و شیمیایی نانوجاذب‌های تهیه‌شده با روش‌های پراش پرتو ایکس (XRD)، میکروسکوپی الکترونی روبشی (SEM)، طیف‌سنجی بازتابی پخشی (DRS) و اندازه‌گیری سطح ویژه جاذب‌ها با روش (BET) بررسی شد. پس از انتخاب جاذب مناسب، سایر عامل های عملیاتی مانند غلظت آلاینده، مقدار جاذب، pH محلول بر بازده حذف بررسی شد. بیشترین بازده جذب نیترات بر زئولیت کلینوپتیلولیت بارگذاری شده با مس اکسید 5 درصد در pH حدود 4 تا 9 در غلظت‌های پایین نیترات و مقدار جاذب 15میلی‌گرم به ازای هر لیتر به دست آمد.
Nitrate ions are considered as a serious threat to surface and underground water sources due to their high solubility in water. Therefore, it is necessary to remove them from water sources. There are many ways to remove nitrate from water. Among the simple ones, removal with adsorbents such as zeolites can be mentioned. In this research, particles of copper oxide/iron oxide were loaded on the Miyaneh clinoptilolite zeolite. The physical and chemical properties of prepared nanosorbents were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflection spectroscopy (DRS), and specific surface area measurement by BET method. After choosing the appropriate adsorbent, The effects of operating parameters such as pollutant concentration, adsorbent dose, and solution pH on the removal efficiency were investigated. The highest nitrate adsorption efficiency was obtained on clinoptilolite zeolite loaded with 5% copper oxide at pH around 4-9, at low nitrate concentrations, and adsorbent dose of 15 mg/l.
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