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بررسی تاثیرpH و قدرت یونی بر رفتار جذب کادمیوم توسط برخی ازجاذب های آلی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 14، دوره 46، شماره 1، فروردین 1394، صفحه 133-140 اصل مقاله (637.84 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2015.54302 | ||
| نویسندگان | ||
| ابراهیم سپهر* 1؛ امیر توسن2 | ||
| 1دانشیار گروه علوم خاک دانشکدة کشاورزی دانشگاه ارومیه | ||
| 2دانشجوی کارشناسی ارشد علوم خاک دانشگاه ارومیه | ||
| چکیده | ||
| به منظور بررسی تأثیر pH و قدرت یونی بر رفتار جذب کادمیوم توسط جاذب‌های آلی، آزمایشی به صورت سیستم بسته با غلظت اولیة کادمیوم 0 تا 200 میلی‌گرم در لیتر با دو سطح pH 4 و 8 و دو قدرت یونی 03/0 و 1/0 مولار روی ساقة آفتابگردان و بقایای هرس سیب انجام شد. داده‌های آزمایشی با مدل‌های جذب لانگمویر، فروندلیچ، و تمکین برازش داده شدند. نتایج نشان داد pHو قدرت یونی اثری قابل توجه بر جذب کادمیوم دارند. حداکثر جذب تک‌لایه‌ای (qmax) و KL (انرژی جذب) در هر دو جاذب با افزایش pH افزایش یافت. ضرایب معادلة فروندلیچ ( KFوn ) و تمکین (KT و A) نیز روندی مشابه نشان دادند. اما، با افزایش قدرت یونی از 03/0 به 1/0 مولار، پارامترهای جذب کاهش یافتند؛ به گونه‌ای که در ساقة آفتابگردان به طور میانگین qmax از8550 به 8150 میلی‌گرم بر کیلوگرم و KL از 14/0 به 08/0 لیتر بر میلی‌گرم و در بقایای سیب qmax از 7550 به 7300 میلی‌گرم بر کیلوگرم و KL از 09/0 به 06/0 لیتر بر میلی‌گرم کاهش یافت. | ||
| کلیدواژه‌ها | ||
| ایزوترم‌های جذب؛ جاذب‌های آلی؛ قدرت یونی؛ کادمیوم؛ pH | ||
| عنوان مقاله [English] | ||
| Influence of pH and Ionic Strength on Cadmium Sorption by Some Biosorbents | ||
| نویسندگان [English] | ||
| Ebrahim Sepehr1؛ Amir Tosan2 | ||
| 1Assistant Professor, Faculty of Agriculture, University of Urmia | ||
| 2Former Graduate Student, Faculty of Agriculture, University of Urmia | ||
| چکیده [English] | ||
| To study the effect of pH and ionic strength on the sorption behavior of cadmium by biosorbents, a batch experiment was conducted with various initial concentrations of Cd2+ (0 – 200 mg.L-1) with two biosorbents (sunflower stalks and apple pruning residues) in two pH (4, 8) levels and two ionic strengths (0.1 and 0.03 M). Sorption data were fitted to Langmuir, Temkin and Freundlich Equations. Results showed that both pH and ionic strength (IS) had significantly affected Cd sorption. Langmuir maximum mono layer adsorption (qmax) and binding energy value (KL) increased with increasing pH by two biosorbents. Sorption coefficients of Freundlich (KF, n) and Temkin (KT , A) indicated similar trends as well. But by increase in IS (from 0.03 to 0.1 M) all the sorption parameters decreased significantly. As for the case of sunflower stalks; with increase in ionic strength, qmax on the average, decreased from 8505 to 8150 mg/kg and KL from 0.14 to 0.08 L/mg; and as for apple pruning residues, qmax decreased from 7550 to 7300 mg/kg and KL from 0.09 to 0.06 L/mg, respectively. | ||
| کلیدواژه‌ها [English] | ||
| Cadmium, Ionic strength, pH, biosorbents, Adsorption isotherm | ||
| مراجع | ||
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