بررسی قابلیت جذب کامپوزیت نانوالیاف پلی‌اکریلویتریل-اُکسیدآهن عامل‌دار شده با 2-آمینو3- متیل-1- هگزانتییل در حذف یون توریم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای مهندسی محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 استاد و عضو هیئت علمی پژوهشگاه علوم و فنون هسته‌ای، پژوهشکده مواد و چرخه سوخت هسته‌ای، تهران، ایران

3 استاد و عضو هیئت علمی گروه مهندسی محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

4 دانشیار و عضو هیئت علمی پژوهشگاه علوم و فنون هسته‌ای، پژوهشکده مواد و چرخه سوخت هسته‌ای، تهران، ایران

چکیده

در این پژوهش به بررسی قابلیت جذب کامپوزیت نانوالیاف پلی اکریلو نیتریل- نانو ذرات اُکسید آهن (PAN/Fe- ONPs) عامل‌دار شده با 2-آمینو 3-متیل-1-هگزانتییل (AMH) در حذف یون توریم ((Th4+ از محلول‌های آبی به‌صورت ناپیوسته پرداخته شد. جاذبPAN/Fe-ONPs/AMH با ترکیب دو روش هیدروترمال و الکتروریسی سنتز شد و ساختار ومورفولوژی آن توسط آنالیزهایXRD، XRF، SEM، BET و FTIR مورد بررسی قرار گرفت. اثر سه متغیر مستقل شامل pH محلول، غلظت اولیه محلول یون‌های توریم و زمان تماس با استفاده از روش سطح پاسخ (RSM) بر پایه طرح مرکب مرکزی (CCD) با 8 نقطه مکعبی، 6 نقطه محوری و 6 نقطه تکرار مورد ارزیابی قرار گرفت. شاخص‌های برازندگی آماری (به‌عنوان مثال، جدول ANOVA، ضریب تعیین، آزمون عدم برازش و مقادیر P) نشان داد که مدل تبیینی از مقبولیت لازم برخوردار است. نتایج بهینه‌سازی نشان داد که درصد جذب توریم (IV) در دمای 25 درجه سلسیوس تحت شرایط بهینه (pH برابر با 7/5، غلظت اولیه 2/23 میلی‌گرم در لیتر محلول توریم و زمان تماس 8/67 دقیقه) برابر 01/98 درصد است. نتایج مدل‌سازی نشان داد که داده‌های تجربی سینتیک جذب توریم، به‌وسیله مدل سینتیکی شبه مرتبه دوم بهتر برازش می‌شوند و همچنین همدمای لانگمیر داده‌های تجربی تعادلی جذب را به‌خوبی توصیف می‌کند. حداکثر ظرفیت جذب PAN/Fe- ONPs/AMH برای توریم 472 میلی‌گرم در گرم تخمین زده شد. یون توریم جذب شده به‌راحتی با استفاده از ترکیب محلول نیتریک و کلریک اسید بازیابی شد و جاذب
PAN/Fe- ONPs/AMH بدون کاهش قابل توجه در ظرفیت جذب مجدداً مورد استفاده قرار گرفت. بازیابی با استفاده از ترکیب محلول نیتریک و کلریک اسید با نسبت به‌ترتیب 4/0 و 2/0 مولار نشان ‌داد که بعد از 5 مرحله جذب-واجذب، ظرفیت جذب PAN/Fe-ONPs/AMH حدود 5/7 درصد کاهش می‌یابد. مطابق نتایج، جاذب PAN/Fe-ONPs/AMH از قابلیت بالایی در جذب و واجذب یون توریم برخوردار است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Preparation of Polyacrylonitrile/Iron Oxide Nanofiber Adsorbent Modified with 2-Amino-3-Methyl- 1-Hexanethiol for the Adsorption of Th4+ Ion

نویسندگان [English]

  • Babak Rouhi Broujeni 1
  • Abdolreza Nilchi 2
  • Amirhesam Hasani 3
  • Reza Saberi 4
1 PhD Student of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Prof., Faculty Member of Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
3 Prof. of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
4 Assist. Prof. Faculty Member of Materials and Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
چکیده [English]

In this study, novel polyacrylonitrile/iron nano oxide (PAN/Fe-ONPs) nanofiber adsorbent modified with 2-Amino-3-methyl-1-hexanethiol (AMH) was synthesized by combination of hydrothermal and electrospinning method and evaluated as an adsorbent for removing thorium (IV) (Th4+) ion from aqueous solution. The PAN/Fe-ONPs/AMH was characterized by X-ray diffraction (XRD), Fourier Transform Infra-Red (FT-IR), Scanning Electron Microscopy (SEM), energy dispersive X-ray analysis (EDX) and Brunauer–Emmett–Teller (BET). Response Surface Methodology (RSM) was utilized in the optimization of Th4+ adsorption for parameters such as pH, the initial metal ion concentration (Th4+ concentration) and contact time. For this purpose, the central composite design (CCD) with a predictive quadratic model was applied with 8 cubic points, 6 pivot points and 6 replicates at the center. The statistical measures (i.e., Analysis of variance (ANOVA), R2, the lack of fit test and the P value) specify that the developed model is proper. The results of optimization showed that the adsorption percentage of PAN/Fe-ONPs/AMH for Th4+ under optimal conditions (pH=5.7, initial concentration 232 mgL-1 and contact time=67.8 min) was 98% at 25oC. In addition, the adsorption kinetics was well defined by the pseudo second-order equation, while the Langmuir model better fit the adsorption isotherms. The adsorption capacity of PAN/Fe-ONPs/AMH was 472 mg Th4+g-1 composite. The loaded Th4+ can be easily regenerated with HNO3/HCl and the PAN/Fe-ONPs/AMH could be used repeatedly without any significant reduction in its adsorption capacity. Adsorbent recovery by using 0.4M HNO3/0.2M HCl solution for adsorbent reuse indicated that the PAN/Fe-ONPs/AMH adsorption capacity for Th4+ was decreased by about 7.5%.

کلیدواژه‌ها [English]

  • Adsorption
  • Th4+
  • 2-Amino-3-methyl-1-hexanethiol
  • PAN/Fe-ONPs Nanofiber
  • Hydrothermal
  • Electrospinning

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