حذف آنیون یدید از پساب با استفاده از رزین آنیونی بازی قوی

اکبری, منی; شریف نیا, شهرام

حذف آنیون یدید از پساب با استفاده از رزین آنیونی بازی قوی

نوع مقاله : پژوهشی اصیل

نویسندگان

منی اکبری

شهرام شریف نیا

دانشگاه رازی

چکیده

آنیون یدید در برخی از پساب‌ها و همچنین آب‌شور وجود دارد. بازیابی آن از پساب از نقطه نظر زیست محیطی و اقتصادی حائز اهمیت است. تخلیه آنیون یدید به آب‌های سطحی ممکن است منجر به شکل‌گیری برخی از ترکیبات یددار در منابع آب آشامیدنی شود که سلامت انسان را تهدید می‌کند. کار حاضر به بررسی جذب آنیون یدید از پساب سنتزی با غلظتmg/l 1000 با استفاده از رزین آنیونی بازی قوی آمبرلیت IR400 Cl پرداخته است. چهار مدل ایزوترم جذب لانگمویر، فروندلیش، تمکین و دوبینین-رادوشکویچ جهت بررسی ایزوترم جذب به کار گرفته شدند. حداکثر ظرفیت جذب استاتیک رزین با استفاده از نمودار ایزوترم جذب و مدل لانگمویر،mg/g 3/466 به دست آمد. عملکرد رزین در pH های مختلف و نیز حضور آلاینده‌های هم‌زمان سولفات، نیترات و کلر مورد بررسی قرار گرفت و بهترین عملکرد در پی‌اچ خنثی به دست آمد. مطالعات سینتیک جذب نشان داد که معادله سرعت شبه درجه دوم با داده‌های آزمایشگاهی تطابق کامل دارد. عملکرد رزین در فاز پیوسته با دو محلول یدید تنها و یدید همراه با غلظت برابر مولی آلاینده‌های سولفات، نیترات و کلر مورد بررسی قرار گرفت که ظرفیت جذب تا اشباع کامل ستون به ترتیب برابر mg/g 2/434 وmg/g 6 /304 به دست آمد. عملکرد رزین در مقایسه با سایر جاذب‌ها چشمگیر بود.

کلیدواژه‌ها

ید

یدید

رزین تعویض یونی

آمبرلیت IR400 Cl

جذب

موضوعات

فیلترکردن

عنوان مقاله English

Removal of Iodide from Wastewater Using Strongly Basic Anion Resin

نویسندگان English

Mona Akbari

Shahram Sharifnia

Razi University

چکیده English

Iodide anion is found in some brine and wastewater. Iodide recovery from wastewater is beneficial from economic and environmental aspects. Discharge of iodide containing wastewater into surface water may lead to formation of some iodine containing species in drinking water sources. It is a treat for human health. In this study, iodide adsorption from wastewater )1000mg/l (using strongly basic anion exchange resins Amberlite IR400 Cl was investigated. Four common two-parameter models were used for description of isotherm adsorption data. Maximum static capacity of resin was obtained from Langmuir isotherm equation and it was 466.3mg/g. Iodide adsorption in various pH and presence of co-existing ions including SO₄^2-, NO₃^- and Cl^- was investigated too. The maximum obtained capacity was related to neutral pH. Kinetics study showed that the uptake of iodide ions was well described by the pseudo-second-order kinetics. Dynamic capacities of resin were investigated with column study. They were 434.2mg/g and 304.6mg/g for iodide adsorption from iodide solution and iodide solution in presence of co-contaminant ions (SO₄^2-, NO₃^- and Cl^-in concentration of 8mmol/l). The data from breakthrough curve was analyzed with common breakthrough models including Thomas, Dose-response and Yun-nelson models. Morphology of resins was investigated with SEM image and presence of iodide on resin was confirmed by EDS analysis and Raman spectra. The adsorption capacity of resin in comparison with the other adsorbents was considerable.

کلیدواژه‌ها English

Iodine

Iodide

Ion exchange resins

Amberlite IR400 Cl

Adsorption

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