جذب کادمیم در سطح نانو‌ذرات دی‌اکسید‌تیتانیم در سوسپانسیون های خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه علوم خاک دانشگاه فردوسی مشهد

2 عضو هیات علمی دانشگاه فردوسی مشهد

چکیده

در این مطالعه برخی عوامل مؤثر در میزان جذب کادمیم در سطح نانو‌ذرات دی‌اکسید‌تیتانیم در خاک و پایداری نانو‌ذرات در سوسپانسیون‌های خاک مورد بررسی قرار گرفته است. نتایج این مطالعه نشان داد که در خاک آلوده به کادمیم در محیط سوسپانسیون‌، مقدار تثبیت کادمیم توسط نانو‌ذرات که به جذب کادمیم در سطح نانو‌ذرات نسبت داده می‌شود، به نسبت خاک‌به‌آب (1:20، 1:10 و 1:5)، میزان آلودگی خاک به کادمیم (5 و 10 میلی‌گرم‌بر‌کیلوگرم کادمیم کل در خاک) و مقدار کاربرد نانو‌ذرات (صفر، 5/0، 1 و 5 درصد) بستگی دارد. به‌طوری‌که کمترین میزان کادمیم استخراج شده با عامل کلات کننده DTPA (Cd-DTPA) در نسبت خاک‌به‌آب 1:5 و مقدار 5 درصد نانو‌ذرات و در خاک با سطح آلودگی 10 میلی‌گرم‌بر‌کیلوگرم کادمیم مشاهده شد. همچنین نتایج آزمایش­های پایداری نشان داد که نانو‌ذرات دی‌اکسید‌تیتانیم در سوسپانسیون‌های خاک طی گذشت ده روز از زمان رهاسازی سوسپانسیون‌ها نسبت به زمان ابتدایی از افزودن نانو ذرات، پایداری خوبی نشان دادند. به‌طور‌کلی با‌توجه به‌اینکه غیر‌متحرک‌کردن کادمیم در خاک‌ها یک تکنیک برای بهبود کیفیت خاک است و نانوذرات دی‌اکسیدتیتانیم پایداری خوبی در سوسپانسیون‌های خاک نشان دادند، استفاده از نانو‌ذرات در آلودگی زدایی خاکهای آهکی مناسب می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Cadmium adsorption on TiO2 Nanoparticles in soil suspensions

نویسندگان [English]

  • Samaneh Aryabod 1
  • Amir Fotovat 2
  • Reza Khorasani 2
  • Mohammad Hassan Entezari 2
1 Ferdowsi University of Mashhad
2 Ferdowsi University of Mashhad
چکیده [English]

In this study, some factors affect cadmium adsorption onTiO2 nanoparticles in soil and stability of nanoparticles in soil suspensions have been investigated. The results of this study showed that in soil contaminated with cadmium in suspension conditions the amount of cadmium stabilized by nanoparticles, which is attributed to adsorption of cadmium on surface of the nanoparticles, will depend on soil to water ratio (1:20, 1:10 and 1: 5), amount of soil pollution cadmium (5 and 10 mg of cadmium per kg of soil) and the use of nanoparticles (zero, 5.0, 1, 5%). So that the least amount of Cd-DTPA was found in soil to water ratio of 1: 5 and 5% of nanoparticles and in the soil contamination level of 10 milligrams per kilogram of cadmium. Also the results of stability tests indicated that the stability of titanium dioxide nanoparticles in soil suspensions over the ten days of release was comparable with that at the beginning of addition of nanoparticles, is good. In total, considering the fact that immobilization of cadmium in soils is a technique to improve the quality of soil and titanium dioxide nanoparticles showed proper stability in soil suspensions, it becomes evident that the use of nanoparticles in the decontamination of calcareous soils is appropriate.

کلیدواژه‌ها [English]

  • Soil contamination
  • Cd-DTPA
  • TiO2 nanoparticles
  • Coating
  • Stabilization
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