مجله آب و فاضلاب

مجله آب و فاضلاب

حذف Ni(II) از نمونه‌های آبی با استفاده از نانو جاذب گرافن اکسید مغناطیسی پیوند خورده با پلیمر

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکترای تخصصی مهندسی شیمی، گروه مهندسی شیمی، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
2 دانشیار، گروه شیمی، دانشکده علوم پایه، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
3 استاد، گروه شیمی، دانشکده علوم پایه، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
4 دانشیار، گروه مهندسی شیمی، دانشکده مهندسی، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
10.22093/wwj.2026.555973.3526
چکیده
فلزات سنگین موجود در محلول‌های آبی، ازجمله نیکل، به دلیل سمیّت بالا، پایداری زیست‌محیطی و قابلیت تجمع در زنجیره غذایی، از مهم‌ترین آلاینده‌های تهدیدکننده سلامت انسان و اکوسیستم‌ها هستند. ازاین‌رو، توسعه جاذب‌های کارآمد و مقرون‌به‌صرفه برای حذف یون‌های فلزی از محیط‌های آبی اهمیتی ویژه دارد .در این پژوهش، نانو کامپوزیت گرافن اکسید مغناطیسی اصلاح ‌شده با کوپلیمر آلیل ‌آمین- وینیل ‌ایمیدازول (Poly-g-MGO) سنتز و به‌عنوان جاذبی مؤثر برای حذف یون Ni(II) ارزیابی شد. شرایط بهینه جذب در آزمایش‌های ناپیوسته شامل pH برابر 7، زمان تماس 80 دقیقه، مقدار جاذب 25/0 گرم در لیتر، دمای 298 کلوین و غلظت اولیه 20 میلی‌گرم در لیتر تعیین شد. در شرایط بهینه، درصد حذف یون Ni(II) به 90 درصد رسید. داده‌های تعادلی بیشترین انطباق را با مدل فروندلیچ نشان دادند که بیانگر ماهیت ناهمگن و چندلایه‌ای فرایند جذب است. حداکثر ظرفیت جذب تک‌لایه بر اساس مدل لانگمیر 366/133 میلی‌گرم بر گرم محاسبه شد. کاهش ظرفیت جذب با افزایش دما از 298 تا 328 کلوین نشان‌دهنده ماهیت گرماده فرایند بود. نتایج سینتیکی نیز بیانگر نقش مؤثر نفوذ درون‌ذره‌ای در مکانیسم کنترل‌کننده جذب بودند. علاوه‌ براین، عملکرد جاذب در نمونه‌های واقعی شامل آب لوله‌کشی، آب رودخانه زاینده‌رود و پساب صنعتی اسپنت‌ کاستیک بررسی شد که کاهش قابل‌توجه درصد حذف در نمونه پساب صنعتی ناشی از رقابت یون‌های مزاحم بود. یافته‌ها نشان دادند که نانو کامپوزیت Poly-g-MGO دارای ظرفیت جذب بالا، رفتار سینتیکی مناسب و عملکرد قابل‌قبول در حذف یون Ni(II) از نمونه‌های آبی است و قابلیت بالقوه‌ای برای کاربرد در تصفیه آب و پساب‌های صنعتی آلوده به یون نیکل دارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Removal of the Ni(II) from Water Samples Using a Polymer-Grafted Magnetic Graphene Oxide Nanoadsorbent

نویسندگان English

Saba Moradi 1
Mahsasadat Miralinaghi 2
Elham Moniri 3
Shadab Shahsavari 4
Mohsen Shabani 2
1 PhD. Student in Chemical Engineering, Dept. of Chemical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
2 Assoc. Prof., Dept. of Chemistry, Faculty of Basic Sciences, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
3 Prof., Dept. of Chemistry, Faculty of Basic Sciences, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
4 Assoc. Prof., Dept. of Chemical Engineering, Faculty of Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
چکیده English

Heavy metals such as nickel in aqueous environments pose significant risks to both human health and natural ecosystems, owing to their pronounced toxicity, environmental persistence, and tendency to bioaccumulate within food chains. In this study, a novel magnetic graphene oxide nanocomposite functionalized with an allylamine–vinyl imidazole copolymer (Poly-g-MGO) was synthesized and utilized as an efficient adsorbent for removing Ni(II) ions from aqueous solutions. Optimum adsorption conditions were established through batch experiments at pH=7, a contact time of 80 minutes, an adsorbent dosage of 0.25 g L−1, and a temperature of 298 K, with an initial Ni(II) concentration of 20 mg L−1. The removal efficiency of Ni(II) reached 90% under these conditions. The adsorption equilibrium data were best described by the Freundlich isotherm model, indicating a multilayer adsorption process on a heterogeneous surface. The Langmuir model estimated a maximum monolayer adsorption capacity of 133.366 mg g−1. The adsorption capacity diminished as the temperature increased from 298 to 328 K, confirming the exothermic nature of the process. Kinetic studies revealed that the adsorption followed a pseudo-second-order kinetic model, with intra-particle diffusion playing a dominant role in the adsorption mechanism. The adsorbent's practical applicability was further evaluated in real water samples, including tap water, Zayandeh-rood river water, and spent caustic industrial wastewater. The lower removal efficiency in industrial wastewater was attributed to the competitive adsorption of coexisting ions. These findings demonstrate the high capability of Poly-g-MGO for Ni(II) removal and its potential for treating contaminated aqueous samples.

کلیدواژه‌ها English

Adsorption
Heavy Metals
Nano Adsorbent
Magnetic Separation
Water Treatment
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