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بهبود جذب یون استرانسیم با استفاده از عوامل کمپلکس‌کننده نوع N و NO نشانده شده بر روی SiO2

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران

2 گروه مهندسی هسته‌ای، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد علوم تحقیقات تهران، صندوق پستی: 775-14515، تهران-ایران

چکیده

با توجه به اهمیت حذف یون استرانسیم موجود در پساب‌­های هسته­ای، در کار حاضر ضمن سنتز لیگاندهای هیدروکسی بنزآلدهید پروپیل تری اتوکسی سیلان (Si-HL3(EtO)) و پیریدیل متیلیدین پروپیل تری اتوکسی سیلان (Si-L3(EtO)) به بررسی خصوصیات نانو ذرات سیلیکای اصلاح ­شده با این لیگاندها به ­عنوان جاذب جامد در حذف یون استرانسیم از محلول آبی پرداخته شد و پارامترهایی مانند pH، زمان، جرم جاذب، دما و یون‌­های مزاحم مورد آزمایش قرار گرفت. بررسی رفتار جذبی جاذ­ب‌­ها نشان داد با اصلاح سطح نانو جاذب توانایی آن در جذب یون استرانسیم در 6pH= از 31/6‌% به 86‌% و 11/22‌% به ترتیب با استفاده از لیگاندهای Si-HL3(EtO) و Si-L3(EtO) افزایش می‌­یابد. نتایج ایزوترم‌­ها و سینتیک­‌های جذب نشان داد که فرایند این جذب از ایزوترم لانگ­مویر و مدل شبه درجه دوم تبعیت می‌­کند. هم‌­چنین مقادیر به دست آمده از پارامترهای ترمودینامیکی نشان داد که حذف استرانسیم از محلول آبی یک فرایند گرماگیر و مقادیر مثبت آنتروپی نیروی محرکه فرایند جذب است.

کلیدواژه‌ها

عنوان مقاله [English]

Improvement of strontium ion adsorption by using N and NO type complexing agents deposited on SiO2

نویسندگان [English]

  • Z. Shiri-Yekta 1
  • S.J. Hoseini 2
  • M. Rahghoshay 2

1 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran – Iran

2 Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, P. O. Box: 14515-775, Tehran-Iran

چکیده [English]

Due to the importance of removing strontium ions in nuclear wastes, in the present work, while synthesizing hydroxybenzaldehyde propyltriethoxysilane ((EtO)3Si-HL) and pyridylmethylidene propyltriethoxysilane ((EtO)3Si-L) ligands, we investigated the properties of silica nanoparticles modified with these ligands as solid adsorbents in The removal of strontium ion from the aqueous solution was investigated and parameters such as pH, time, the mass of adsorbent, temperature, and interfering ions were tested. The adsorption behavior of the adsorbents showed that by modifying the surface of the nano adsorbent, the ability of the adsorbents to adsorb strontium ion at pH=6 increased from 6.31% to 86% and 22.11% using the (EtO)3Si-HL and (EtO)3Si-L ligands, respectively. The results of isotherms and adsorption kinetics indicate that the adsorption process follows the Longmuir isotherm and the pseudo-second-order model, respectively. Also, thermodynamic parameters show that strontium removal from the aqueous solution is an endothermic process. The positive entropy values are the driving force behind the adsorption process.

کلیدواژه‌ها [English]

  • Strontium
  • Nano silica
  • Hydroxybenzaldehyde propyltriethoxysilane ligand
  • Adsorbent modification
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مجله علوم و فنون هسته ای
دوره 45، شماره 1 - شماره پیاپی 107
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