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بررسی سینتیک و ترمودینامیک جذب کادمیوم و سرب بوسیله دیاتومیت در محیط آبی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 132، دوره 49، شماره 6، بهمن و اسفند 1397، صفحه 1267-1276 اصل مقاله (735.22 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.247444.667810 | ||
| نویسندگان | ||
| مرضیه پیری1؛ ابراهیم سپهر* 2 | ||
| 1دانشجوی دکتری گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه، ارومیه، ایران | ||
| 2دانشیار 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 | ||
| کلید واژگان: جذب؛ دیاتومیت؛ سرب؛ کادمیوم؛ پالایش آب | ||
| عنوان مقاله [English] | ||
| Kinetic and thermodynamic studies of Cd and Pb sorption using diatomite from aqueous solutions | ||
| نویسندگان [English] | ||
| marziyeh piri1؛ Ebrahim sepehr2 | ||
| 1Ph. D. Student, Department of Soil Science, Urmia University, Urmia, Iran | ||
| 2Associate 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 | ||
| مراجع | ||
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