حذف یون‌های فلزی کادمیوم و سرب از محلول‌های آبی با استفاده از جاذب نانو-حفره MCM-48 و اصلاح شده NH2-MCM-48
محورهای موضوعی : آلودگی های محیط زیست (آب، خاک و هوا)هادی وطن دوست 1 , حبیب‌اله یونسی 2 , زهرا مهربان 3 , آوا حیدری 4
1 - کارشناس ارشد محیط زیست، دانشکده منابع طبیعی وعلوم دریایی، دانشگاه تربیت مدرس، نور، ایران.
2 - استاد دانشکده منابع طبیعی وعلوم دریایی،دانشگاه تربیت مدرس، نور، ایران.
3 - استادیار کمیته فن‌آوری های نو، تهران، ایران.
4 - دکتری محیط زیست ، دانشکده منابع طبیعی وعلوم دریایی، دانشگاه تربیت مدرس، نور، ایران.
کلید واژه: NH2-MCM-48, کادمیوم, سرب, جاذب, حذف,
چکیده مقاله :
زمینه و هدف: در این مطالعه،جاذب سیلیکاته نانو حفره تحت عنوان MCM-48 با مساحت سطح بالایی تهیه شد و جهت افزایش ظرفیت جذب فلزات سنگین با استفاده از آمینو پروپیل تری متوکسی سیلان اصلاح گردید. جاذب‌های سیلیکاته از جمله جاذب های موثر در جذب فلزات سنگین هستند. روش بررسی: حذف یون‌های فلزی کادمیوم و سرب از محلول های آبی توسط MCM-48 و جاذب نانو حفره اصلاح شده NH2-MCM-48 در سیستم ناپیوسته بررسی شد. اثر متغیرهای مقدار جاذب، pH محلول، زمان تماس و غلظت اولیه محلول مورد مطالعه قرار گرفت. داده های آزمایش با استفاده از همدمای لانگمایر و فرندلیخ و با آنالیز رگرسیون غیر خطی، تجزیه و تحلیل شد. یافته ها: حداکثر ظرفیت جذب نانو حفره اصلاح شده NH2-MCM-48 برای کادمیوم و سرب به ترتیب 62.07 و 108.16 میلی گرم بر گرم به دست آمد. تغییر در میزان هر یک از متغیرها منجر به تغییر در میزان ظرفیت جذب جاذب شد. بحث و نتیجه‌گیری: نتایج این تحقیق نشان داد که عامل دار کردن نانو حفره MCM-48 با گروه عاملی آمین و تهیه NH2-MCM-48 باعث افزایش چشم‌گیر ظرفیت جذب یون های فلزی کادمیوم و سرب از محلول های آبی می شود و این ترکیب می‌تواند به عنوان یک جاذب موثر در جذب یون‌های فلزی مورد استفاده قرار گیرد.
Background and Objective: In this study, nanoporous silica adsorbent of MCM-48 was synthesized. The adsorbent capacity of heavy metal was increased by modification of the surface with 3-aminopropyltrimethoxysilane. Silica adsorbents are very effective in heavy metal adsorption. Method: In the present study, removal of Pb (II) and Cd (II) heavy metal ions from aqueous solution was carried out using MCM-48 and NH2-MCM-48 modified nanoporous adsorbents in a batch system. The effect of adsorbent dosage, solution pH and contact time were studied. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms by nonlinear regression analysis. Findings: The maximum adsorption capacities of NH2-MCM-48 for Cd (II) and Pb (II) were found to be 62.07 and 108.16 mg/g, respectively. Changing the level of each variable resulted in change of adsorption capacity of the adsorbents. Conclusion: The results of this study indicated that modification of MCM-48 to synthesize NH2-MCM-48 will increase the adsorbent capacity for Cd (II) and Pb (II) ions and this compound can be used as an effective adsorbent for the adsorption of metal ions.
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