بررسی جذب توریم از محلول‌های آبی توسط رزین‌های XAD-7 آغشته به مخلوطی از ترکیبات فسفاتی در یک سیستم ناپیوسته
محورهای موضوعی : مهندسی شیمی (آلودگیهای محیط زیست)
حسین سیدکلال
1
(سازمان انرژی اتمی ایران)
کلید واژه: جذب سطحی, مدل هم‌دما, جداسازی توریم, رزین XAD-7 , آغشته‌سازی, ترکیبات فسفاتی,
چکیده مقاله :
به دليل سمّيت بالاي توریم، تعیین مقدار دقیق و جداسازي آن در پسماندهاي هسته‌اي، امری ضروری است. در اين پژوهش، یون‌های توريم به وسيله‌ی رزين‌های تبادل يون Amberlite XAD-7 که با دو ترکيب فسفاتي (3-اکتيل فسفين‌اکسيد) وT2EHP (3-2-اتيل‌هگزيل فسفات) آغشته و اصلاح شده بودند، در یک سیستم ناپیوسته مورد جذب قرار گرفتند. تاثیر پارامترهای مهم و موثر بر فرآیند جذب از جمله pH ، زمان، دما و وجود یون‌های مزاحم و همچنین اثر شوینده‌ی مناسب برروی میزان واجذبی بررسی و ارزیابی شد. روابط ترموديناميکي و چندین مدل جذب هم‌دما از جمله فروندلیش، لانگمویر ،تمکین و ردلیش-پترسون برای توصیف تعادل جذب بررسي شدند. برای تعیین میزان جذب توريم از روش اسپکترومتري نشراتمي پلاسما (ICP) استفاده شد. بررسي ساختار جاذب اصلاح‌شده با روش‌هاي طيف‌سنجي مادون قرمز (IR) و آنالیز توزین حرارتی (TGA) صورت گرفت. با توجه به نتایج بدست آمده از آزمایش‌های جذب توریم بر روی رزین‌های XAD-7 آغشته‌شده به ترکیبات فسفاتی، این نتیجه گرفته شد که واکنش جذب به صورت خودبخودی (منفی بودن تغییرات انرژی آزاد گیبس) انجام می‌شود و هچنین یک فرایند گرمازا (منفی بودن تغییرات آنتالپی) می‌باشد. از میان مدل‌های جذب هم‌دما، مدل ردلیش-پترسون غیرخطی در دمای °C35 بهترین نتیجه را به همراه داشت
It is necessary to separate and determine the exact amount of thorium in nuclear wastes due to its high toxicity. In this study, thorium ions were adsorbed in a batch system by Amberlite XAD-7 ion exchange resin impregnated with phosphate compounds such as TOPO (tri-octylphosphine oxide) and T2EHP (tri-2-ethylhexyl phosphate). The effect of important and effective parameters on the adsorption process such as pH, time, temperature and the presence of interfering ions, as well as the effect of appropriate detergent on desorption, was investigated and evaluated. Thermodynamic relationships and several isothermal adsorption models including Freundlich, Redlich-Peterson, Langmuir and Temkin were investigated to describe the adsorption equilibrium. Inductively Coupled Plasma (ICP) was used to determine the amount of thorium adsorption. The structure of the modified adsorbent was investigated by infrared (IR) spectroscopy and thermal gravimetric analysis (TGA) methods. Based on the results obtained from the tests of thorium adsorption on XAD-7 resins impregnated with phosphate compounds, it was concluded that the adsorption reaction is a spontaneous (negative Gibbs free energy changes) and an exothermic process (negative enthalpy changes). Among the isothermal adsorption models, the nonlinear Redlich-Peterson model had the best result at 35 °C.
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