حذف سرب با نانو ساختارهای آلی فلزی آهن و بنزن تری کربوکسیلات از محلول آبی
محورهای موضوعی : مهندسی محیط زیست
1 - دانشگاه صنعتی قم
کلید واژه: مواد آلی فلزی, تصفیه پساب , جذب سطحی, سرب, همدما,
چکیده مقاله :
فلزات سنگین به‌طور شیمیایی تخریب نمی‌شوند به‌منظور جلوگیری از ورود و انباشته شدن این آلاینده سمی همراه با پساب کارخانه‌ها به محیط زیست تاکنون روش‌های مختلفی بکارگیری شده است، ولی یافتن روش‌های نوین با کارایی بیشتر در این حوزه ضروری است. در این تحقیق دسته نوینی از ترکیبات موسوم به مواد آلی فلزی برای حذف سرب پساب صنعتی مورد استفاده قرار گرفته است. این مواد آلی فلزی، حاوی آهن و بنزن تری کربوکسیلات است. برای شناسایی مشخصات این مواد از تصاویر میکروسکوپ الکترونی و هم‌دماهای جذب و واجذب نیتروژن استفاده شده است. جهت تعیین شرایط بهینه به‌کارگیری این مواد در حذف سرب از پساب، اثر پارامترهای: زمان (10-120دقیقه)، مقدار جاذب (5/0-2/0میلی‌گرم بر لیتر)، (pH (5/12-5/3 و درجه حرارت (10-75سانتیگراد) بررسی شد. نتایج نشان می‌دهد که ترکیب MIL-100Fe)) دارای کارایی بهتری نسبت به دیگر مواد این تحقیق بوده و حذف کامل سرب با غلظت اولیه mg/l10 و با دوز جاذب mg/l25/0، در دمای 50 درجه سانتیگراد، 4/3 pH= و زمان تماس 120 دقیقه حاصل شد. ویژگی های دیگر این ماده در حذف سرب پساب صنعتی مانند: خواص مغناطیسی، قابلیت استفاده مجدد در پنج دوره متوالی، سطح وسیع، هزینه پائین، راندمان بالا و بکارگیری آسان، آن را گزینه ایده‌آلی برای استفاده در مقیاس گسترده ساخته است.
Heavy metals are not chemically degraded, in order to prevent the entry and accumulation of this toxic pollutant along with factory effluents into the environment, so far, different methods have been used, but finding new methods with more efficiency in this area is necessary. In this research, a new class of compounds called organic metallic materials has been used to remove industrial effluent lead. These organic metallic materials contain iron and benzene tricarboxylate. To identify the characteristics of these materials, electron microscope images and Nitrogen adsorption and desorption isotherms has been used. To determine the optimal conditions for using these materials for lead removal from the effluent, the effect of parameters: time (10-120 min), the amount of adsorbent (0.2-0.5 mg/L), pH (3.5 -12.5) and temperature (10-75 ° C) were evaluated. The results show that the composition of MIL-100 (Fe) has a better performance than the other materials in this study and complete removal of lead was achieved with an initial concentration of 10 mg/l and an adsorbent dose of 0.25 mg / l, at a temperature of 50 ° C, pH =4.3 and contact time of 120 min. Other properties of this material in removal of industrial effluent lead such as magnetic properties, reusability in five consecutive periods, large surface area, low cost, high efficiency and easy to use, make it an ideal option for large-scale use.
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