نانوذرات Fe3O4@SiO2 عامل¬دار شده با بیس](3و4-سالسیلیک ایمینو) بنزوفن ایمین[ لیگاند به عنوان یک جاذب مغناطیسی حذف Ni2+ از محلول¬های آبی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
مریم چینی ساز
1
,
مجید سلیمانی
2
,
مجید قهرمان افشار
3
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1 - گروه شیمی، دانشکده علوم، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران
2 - گروه شیمی دانشگاه امام خمینی قزوین
3 - استادیار، گروه پژوهشی شیمی و فرایند، پژوهشگاه نیرو، تهران، ایران
کلید واژه: نانوذرات Fe3O4@SiO2, بیس](3و4-سالسیلیک ایمینو) بنزوفن ایمین لیگاند, فلزات سنگین, جذب مؤثر, نیکل دو ظرفیتی.,
چکیده مقاله :
مقدمه: در پژوهش حاضر، نانوذرات Fe3O4@SiO2 عامل دار شده با بیس](3و4-سالسیلیک ایمینو) بنزوفن ایمین لیگاند با استفاده از روش هم رسوبی سنتز گردید. در مرحله بعد نانوجاذب پیشنهادی به عنوان یک جاذب مؤثر و قدرتمند به منظور حذف یونهای Ni2+ از محلولهای آبی مورد استفاده قرار گرفت. در نهایت جاذب سنتزی تعیین مشخص گردید و پارامترهای کلیدی کاربرد جاذب در جذب یون نیکل بهینه سازی گردید.
روش: بررسی و ارزیابی اندازه ذرات، مورفولوژی و خصوصیات ساختاری با بکارگیری آنالیزهای میکروسکوپ الکترونی عبوری و روبشی، طیفسنجی مادون قرمز تبدیل فوریه، مغناطیسسنج نمونه مرتعش، پراش انرژی پرتو ایکس و پراش اشعه ایکس انجام گرفتند. سپس بهینهسازی پارامترهای مؤثر فرایند جذب نظیر دوز جاذب، زمان تماس با یون هدف و pH در 50 میلیلیتر محلول یون Ni2+ (غلظت اولیه mmol/L 0.35) در دمای محیط انجام گرفت.
یافتهها: بررسی نتایج حاکی از آن است که بهترین عملکرد جاذب مغناطیسی در جذب 93% یونهای نیکل در 7=pH با حضور 16 میلیگرم جاذب و در مدت زمان تماس 22 دقیقه اتفاق میافتد. همچنین جاذب سنتزی قابلیت بکارگیری در چرخههای متوالی جذب-واجذب برای 6 مرتبه بدون کاهش جدی در فعالیت جذبی را دارا میباشد.
نتیجهگیری: جاذب پیشنهادی دارای مزایایی کلیدی شامل قدرت کئوردیناسیون عالی با یونهای فلزی، نسبت سطح به حجم بالا، گروههای هترواتمی سطحی و ایجاد سایتهای فعال جذبی، سنتز آسانT بکارگیری از مقادیر ناچیز جاذب، ظرفیت جذب بالا، قابلیت بازیابی و استفاده مجدد در فرایندهای متوالی جذب-واجذب می باشد.
Introduction: In the present study, Fe3O4@SiO2 nanoparticles functionalized with bis](3,4-salicylic imino)benzophenimine ligand is synthesized by co-precipitation method. In the next step, the proposed nano adsorbent is applied as an effective and powerful adsorbent to remove nickel ions from aqueous solutions. Finally, the proposed nanoadsorbent are characterized and the key parameters of the adsorption process are optimized.
Methods: Investigation and evaluation of particle size, morphology and structural characteristics are performed using transmission and scanning electron microscope analyses, Fourier transform infrared spectroscopy, vibrating sample magnetometer, X-ray energy diffraction and X-ray diffraction.
Findings: Afterwards, the optimization of the effective parameters of the adsorption process such as the adsorbent dose, the contact time with the target ion and the pH are carried out in 50 ml of nickel ion solution (initial concentration 0.35 mmol/L) at ambient temperature. According to the result, that the optimum performance of the magnetic adsorbent is obtained about 93% of nickel ions at pH 7 with the presence of 16 mg of adsorbent and a contact time of 22 min. Moreover, the synthetic adsorbent has the ability to be used in successive absorption-absorption cycles for 6 times without a serious decrease in absorption activity. The proposed nanoadsorbent possesses advantage including excellent coordination with metal ions, high surface-to-volume ratio, surface heteroatomic groups and creation of active absorption sites, easy synthesis, use of magnetic separation technique as a suitable and effective solution, use of small amounts of adsorbent, high adsorption capacit.
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