پالایش آب‏های آلوده به کادمیوم (II) Cd با استفاده از خاک‌ارۀ صنوبر (Populusnigra) به‌عنوان جاذب زیستی ارزان: بهینه‌سازی فرایند با استفاده از روش پاسخ سطح

نوع مقاله: پژوهشی

نویسندگان

1 استادیار گروه علوم خاک دانشگاه ارومیه

2 استادیار گروه مهندسی شیمی دانشگاه زنجان

چکیده

در این تحقیق فرایند حذف کادمیوم از محلول آبی توسط خاک‌ارۀ صنوبر (Populus nigra) به‌عنوان نوعی جاذب زیستی ارزان و در دسترس بررسی شده است. برای بهینه‌سازی کارایی حذف کادمیوم، پارامترهای فیزیکی‌ـ شیمیایی مختلفی از قبیل pH، غلظت اولیۀ یون فلزی، مقدار جاذب و زمان تماس بررسی شد. آزمایش‏های جذب کادمیوم براساس طرح مرکب مرکزی و با دامنه‏ای از غلظت‏های اولیۀ کادمیوم برابر 5‌ـ 25 میلی‏گرم بر لیتر انجام شد. دامنۀ تغییرات برای سایر متغیر‏ها شامل pH، زمان تماس، مقدار خاک‌اره به‌ترتیب برابر 10، 105، 2‌ـ 5 دقیقه و 5‌ـ 50 گرم بر لیتر بود. نتایج نشان دادند توافق خوبی بین مقادیر پیش‏بینی‌شده توسط مدل مرکب مرکزی حذف کادمیوم از محیط آبی و داده‏های مشاهده‏ای وجود دارد (9283/0 = R2 و %93/2 = RMSE). با استفاده از طرح مرکب مرکزی بیشترین حذف 25/96 درصد در غلظت کادمیوم 75/38 میلی‏گرم بر لیتر،  pH5/6، خاک‏اره 10 گرم بر لیتر و نیز زمان تماس 80 دقیقه به‌عنوان شرایط بهینه تعیین شد. با توجه به کارایی زیاد و همچنین مکانیسم جذب سریع کادمیوم، استفاده از خاک‏ارۀ صنوبر ارزان‌قیمت در فرایند پالایش آب از فلزات سنگین به‌ویژه کادمیوم توصیه می‏شود.
 
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Remediation of cadmium contaminated water by Populus nigraSawdust as a low-cost biosorbent: Process optimization by using response surface methodology

نویسندگان [English]

  • Farrokh Asadzadeh 1
  • Mahdi Maleki Kaklar 2
  • Mohsen Barin 1
1 Department of Soil Science, Urmia University, Urmia, Iran
2 Department of Chemical Engineering, University of Zanjan, Zanjan, Iran
چکیده [English]

In this study, the removal of Cd(II) from aqueous solutions have been carried out using Populusnigra saw dust as low-cost, readily available biosorbent. Various physico-chemical parameters such as pH, initial metal ion concentration, and adsorbent dosage level and contact time were studied at room temperature to optimize the conditions for maximum adsorption. The central composite design was carried out with aqueous solution of cadmium with various concentrations ranging from 5-25 mgl-1. The range of variation for the other variables including pH, sawdust dosage and contact time are 2-10, 5-50 gl-1, and 5-105 minutes, respectively. A good agreement between predictive model for cadmium removal by sawdust and experimental results was observed (R2= 0.9283 and RMSE=2.93%). The maximum removal of 96.25% was achieved at cadmium concentration 38.75 mgl-1, pH of 6.5, saw dust dosage of 10 gl-1 and contact time of 80 min as the optimal conditions. The highly efficient and the rapid uptake of Cd(II) by low cost saw dust indicated that it could be an excellent alternative for the removal of cadmium by sorption process from contaminated aqueous solutions.

کلیدواژه‌ها [English]

  • Bioadsorbent
  • Heavy metals
  • modeling
  • Response Surface Methodology
  • water pollution
 
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