بررسی عملکرد جاذب پلیمری چاپ یونی جهت حذف فلز سنگین روی از محیط آبی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
مرتضی فقیهی
1
,
محسن اسماعیل پور
2
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1 - استادیار، گروه پژوهشی شیمی و فرآیند، پژوهشگاه نیرو، تهران، ایران
2 - استادیار، گروه پژوهشی شیمی و فرآیند، پژوهشگاه نیرو، تهران، ایران
کلید واژه: جاذب پلیمری, چاپ یونی, یون روی, فلز سنگین, ایزوترم, سینتیک. ,
چکیده مقاله :
بحث تصفیه آب در دهه های اخیر بسیار مورد توجه کشورها قرار گرفته است. استفاده از جاذبهای نوین در فرآیند جذب آلایندهها از آب به یکی از مباحث مهم در تحقیقات بدل شده است. از این رو در این تحقیق ساخت و بررسی خواص جاذب پلیمری چاپ یونی جهت حذف فلز سنگین روی از محیط آبی انجام شده است. در ابتدا ساختارهسته/پوسته مغناطیسی آهن/سیلیکا ساخته شد و پس از عاملدار شدن با گروه عاملی آمینی، به عنوان پایه برای ساخت جاذب پلیمری چاپ یونی استفاده شد. جاذب پلیمری چاپ یونی با حضور پایه مغناطیسی، یون هدف روی، آغازگر و اتصال دهنده سنتز گردید. آزمونهای FT-IR، XRD، FE-SEM، TEM، BET و VSM جهت تعیین خواص ساختاری پایه هسته/پوسته و جاذب پلیمری چاپ یونی استفاده شدند. همچنین جهت عملکرد جذبی، آزمونهای تأثیر pH، دوز جاذب، غلظت اولیه، سینتیک و ایزوترم انجام گردیدند. ساختار کروی با متوسط اندازه ذرات nm 40-30 برای جاذب پلیمری چاپ یونی در نتایج مورفولوژی مشاهده شد. همچنین وجود فاز آهن (مگنتیت) با عملکرد مغناطیسی مناسب در آزمونهای XRD، FTIR و VSM تایید شد. دادههای آزمایشگاهی با مدل سینتیک شبه درجه دوم و مدل ایزوترم لانگمویر تطابق بهتری نشان دادند و حداکثر ظرفیت جذب یون فلزی روی توسط جاذب پلیمری چاپ یونی mg/g 49/88 تخمین زده شد.نتایج نشان داد که جاذب پلیمری چاپ یونی عملکرد جذب انتخاب پذیر بسیار خوبی برای یون فلزی روی از محیطهای آبی دارد.
Introduction: In this study, the construction and investigation of the properties of an ion-imprinted polymer adsorbent for the removal of heavy metal zinc from the aquatic environment was carried out.
Methods: Initially, a magnetic core/shell structure of iron/silica was fabricated and after functionalization with an amine functional group, it was used as a base for the preparation of an ion-imprinted polymer adsorbent. The ion-imprinted polymer adsorbent was synthesized in the presence of a magnetic base, zinc target ion, initiator, and binder. FT-IR, XRD, FE-SEM, TEM, BET, and VSM tests were used to determine the structural properties of the core/shell base and the ion-imprinted polymer adsorbent. Also, for the adsorption performance, the effects of pH, adsorbent dosage, initial concentration, kinetics, and isotherm were performed.
Findings: A spherical structure with an average particle size of 30-40 nm was observed for the ion-imprinted polymer adsorbent in the morphology results. Also, the presence of an iron phase (magnetite) with suitable magnetic performance was confirmed in XRD, FTIR and VSM tests. The experimental data showed a better agreement with the pseudo-second-order kinetic model and the Langmuir isotherm model, and the maximum adsorption capacity of zinc metal ion by the ion-imprinted polymer adsorbent was estimated to be 88.5 mg/g. The results showed that the ion-imprinted polymer adsorbent has a very good selective adsorption performance for zinc metal ion from aqueous media.
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