کارایی روش سطح پاسخ بر مبنای طرح باکس بنکن در بهینه سازی فرایند جذب مس و کادمیم از محلول‌های آبی با استفاده از کیتوزان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته دکتری گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه

2 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه ارومیه

3 استاد گروه علوم خاک؛ دانشگاه ارومیه

4 استاد گروه شیمی؛ دانشگاه ارومیه

5 استاد گروه صنایع غذایی؛ دانشگاه ارومیه

چکیده

     وجود فلزات سنگین در منابع آب و پساب از مشکلات زیست محیطی بسیاری از جوامع است. فرایند جذب و استفاده از جاذب­های ارزان قیمت یکی از روش­هایی است که در سال­های اخیر توجهات زیادی را به خود جلب کرده است. هدف این پژوهش بررسی تأثیر کیتوزان در جذب فلزات سنگین کادمیم و مس از محلول­های آبی با استفاده از روش سطح پاسخ بر مبنای مدل باکس بنکن می­باشد. برای این منظور آزمایشات پیمانه­ای جذب به منظور ارزیابی اثر متغیرهای مستقل شامل pH، قدرت یونی و غلظت با استفاده از روش ذکر شده برای ارزیابی اثرات این متغیرها انجام گردید. از آنالیز واریانس یک طرفه برای تجزیه و تحلیل داده­ها استفاده شد. با توجه به مقادیر ضریب تعیین (99/0=R2) وR2 متعادل شده (99/0=R2adj) می­توان گفت مدل به دست آمده برای تحلیل داده­ها مناسب می­باشد. آنالیز واریانس یک طرفه (0001/0>p) نشان داد مدل درجه دو بهترین مدل برای تعیین برهمکنش متغیرهای مطالعه می­باشد. شرایط بهینه برای جذب حداکثر مس و کادمیم از محلول­های آبی به ترتیب در محدوده pH 47/5 و 26/5، غلظت 200 و 8/168 (mg L-1) و قدرت یونی 03/0 (mol L-1) بدست آمد. مقادیر پیش­بینی شده جذب برای شرایط بهینه ذکر شده برای مس و کادمیم به ترتیب 68/83 و 07/45 (mg g-1) شد. بنابراین روش سطح پاسخ می­تواند در بهینه سازی حذف کادمیم و مس از محلول­های آبی به وسیله کیتوزان موثر باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Usefulness of Response Surface Method by Application of Box-Behnken Design for Optimizing Cd and Cu Sorption from Aqueous Solutions by Chitosan

نویسندگان [English]

  • M Piri 1
  • E Sepehr 2
  • A Samadi 3
  • KH Farhadi 4
  • M Alizadeh Khaledabad 5
1 Ph.D. Graduate, Dept. of Soil Sci., Faculty of Agric., Univ. of Urmia Iran
2 Assoc. Prof., Dept. of Soil Sci., Faculty of Agric., Univ. of Urmia Iran
3 Prof., Dept. of Soil Sci., Faculty of Agric., Univ. of Urmia Iran
4 Prof., Dept. of Chemistry Sci., Faculty of Chem., Univ. of Urmia Iran
5 Prof., Dept. of Food Sci. and Techno., Faculty of Agric., Univ. of Urmia Iran
چکیده [English]

Existence of heavy metals in water resources and wastewater can cause the environmental problems. Use of low-cost substances as adsorbents has been developed over recent years. The purpose of this study was to investigate the effect of chitosan on sorption of Cd and Cu heavy metals from aqueous solutions using response surface method and Box–Behnken methods.  The batch experiment was conducted to evaluate the effects of independent variables such as pH, metal concentration, and ionic strength on the metal sorption using response surface and Box–Behnken methods. One-way analysis of variance (ANOVA) was applied on data. High values of R2 (0.99) and adjusted R2 (0.99) showed that the removal of Cu and Cd can be described by the response surface method. One-way ANOVA showed (p < 0.001) that quadratic was the best model for determining the interaction variables. The optimal conditions determined for Cu and Cd initial concentrations, pH and ionic strength values were 200 and 168.8 mg L-1, 5.47 and 5.26 and 0.03 M, respectively. The predicted adsorption at these settings for Cu and Cd were 83.68 and 45.07 mg g-1, respectively. Response Surface Method could be useful for optimization the adsorption of Cu and Cd from aqueous solutions by chitosan

کلیدواژه‌ها [English]

  • Box-Behnken
  • Chitosan
  • Cd
  • Cu
  • Response surface method
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