بررسی سینتیک و ترمودینامیک جذب کادمیوم و سرب بوسیله دیاتومیت در محیط آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران

2 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران

چکیده

در این مطالعه سینتیک و ترمودینامیک جذب کادمیوم و سرب از محلول­های آبی به وسیله دیاتومیت مورد بررسی قرار گرفت. جذب فلزات سنگین در زمان­های مختلف  توسط مدل­های سینتیکی شبه درجه اول، شبه درجه دوم، ایلوویچ و تابع توانی برازش داده شدند. همچنین، مدل­های لانگمویر، فروندلیچ، تمکین و دوبینین-رادوشکویچ برای برازش داده­های جذب در دماهای (283، 293، 303 و 313 درجه کلوین) بکاربرده شدند. نتایج نشان داد با افزایش زمان تماس و دما جذب کادمیوم و سرب به وسیله دیاتومیت بیشتر می­شود. جذب فلزات در زمان­های مختلف با مدل شبه درجه دوم بهترین برازش  (1-99/0=R2) و با مدل­های لانگمویر و دوبینین-رادوشکویچ برازش خوبی را نشان دادند. پارامترهای ترمودینامیکی شامل تغییرات انرژی آزاد گیبس (G∆)، آنتالپی (H∆) و آنتروپی (S∆) نشان دادند که فرایند جذب  فلزات به وسیله دیاتومیت در محدوده دمایی 283 تا 313 درجه کلوین خودبخودی و گرماگیر است.  با توجه به انرژی جذب  مدل دوبینین-رادوشکویچ(E)، جذب کادمیوم به وسیله دیاتومیت احتمالا از یک فرایند فیزیکی،  (kJ mol− 18>E)، اما جذب سرب احتمالا از یک فرایند شیمیایی پیروی می­کند (kJ mol− 18<E). دیاتومیت کارایی بالاتری برای حذف سرب (99%=RE) در مقایسه با کادمیوم (86%=RE) از محلول آبی دارد. بنابراین، دیاتومیت می­تواند به عنوان یک جاذب موثر برای جذب کادمیوم و سرب از منابع آب آلوده استفاده شود.  

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Kinetic and thermodynamic studies of Cd and Pb sorption using diatomite from aqueous solutions

نویسندگان [English]

  • marziyeh piri 1
  • Ebrahim sepehr 2
1 Ph. D. Student, Department of Soil Science, Urmia University, Urmia, Iran
2 Associate Professor, Department of Soil Science, Urmia University, Urmia, Iran
چکیده [English]

In this study, kinetic and thermodynamic of Cd and Pb sorption from aqueous solutions were studied using diatomite. Kinetic sorption of heavy metals was analyzed by pseudo-first-order, pseudo-second-order, Elovich and power function equation in terms of their fitness. Freundlich, Langmuir, Temkin, Dubinin-Radushkevich (D-R) isotherm models have also been used for fitness of adsorption data in different temperatures (283, 293, 303 and 313 K). The results showed that the sorption of Cd and Pb by diatomite is intensified by increasing contact time and temperature. Kinetic sorption of heavy metals data showed the best fitness with the pseudo-second-order equation (R2=0.99) and a good fitness with Langmuir and D-R equations.  The thermodynamic parameters such as Gibb's Free Energey (ΔG), Enthalpy (ΔH) and Entropy (ΔS) indicated that the adsorption of Cd and Pb ions were spontaneous and endothermic at 283–313 °K. Regarding to the adsorption energy of D–R model, Cd adsorption by diatomite (E< 8 kJ mol− 1) is probably followed by a physical process, but Pb adsorption by diatomite (E> 8 kJ mol− 1) is probably followed by a chemical process Diatomite has a greater efficiency for removal of Pb (RE=99%) than that of Cd (RE=86%) from aqueous solutions. Therefore, diatomite could be used as an efficient sorbent for the sorption of Pb and Cd (II) from polluted water resources.

کلیدواژه‌ها [English]

  • کلید واژگان: حذف
  • عناصر سنگین
  • مدل‌های سینتیک

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تحقیقات آب و خاک ایران
دوره 49، شماره 6
بهمن و اسفند 1397
صفحه 1267-1276

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