اثر نانوذرات و میکرو‌ذرات دی‌اکسید‌تیتانیم در تثبیت کادمیم در سوسپانسیون‌های خاک در حضور اسید‌هومیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری علوم خاک، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه فردوسی مشهد ، مشهد، ایران

3 دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

4 استاد گروه شیمی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

در این مطالعه غیر‌متحرک‌کردن کادمیم در خاک در حضور نانوذرات و میکرو‌ذرات دی‌اکسید‌تیتانیم و نقش اسید‌هومیک در پایداری نانو‌ذرات و جذب کادمیم در سطح نانوذرات و میکرو‌ذرات مورد بررسی قرار گرفته است. نتایج این مطالعه نشان داد که در خاک آلوده به کادمیم در محیط سوسپانسیون‌، اسید‌هومیک باعث افزایش فراهمی‌کادمیم در خاک از طریق افزایش غلظت کادمیم در محلول‌رویی سوسپانسیون‌ها می‌شود و اصلاح سطح نانو‌ذرات دی‌اکسید‌تیتانیم با اسید‌هومیک جذب کادمیم را در سطح نانو‌ذرات افزایش می‌دهد. همچنین از‌آنجا که میکرو‌ذرات غلظت کادمیم محلول‌رویی سوسپانسیون‌ها و غلظت کادمیم تبادلی را به‌ مقدار بیشتری از نانو‌ذرات کاهش داده‌اند می‌توان نتیجه­گیری کرد که اثر میکرو‌ذرات در کاهش فراهمی کادمیم در خاک بیشتر از نانو‌ذرات بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Nano and Micro TiO2 on Cadmium Stabilization in Soil Suspension in the Presence of Humic Acid

نویسندگان [English]

  • Samaneh Aryabod 1
  • Amir Fotovat 2
  • Khorassani Reza 3
  • Mohammad Hassan Entezari 4
1 PhD student of soil science, Faculty of agriculture, Ferdowsi university of Mashhad, Mashhad, Iran
2 Associate Professor, Department of Soil Science, Faculty of agriculture, Ferdowsi university of Mashhad, Mashhad, Iran
3 Associate Professor, Department of Soil Science, Faculty of agriculture, Ferdowsi university of Mashhad, Mashhad, Iran
4 Professor, Department of Chemistry, Faculty of sciences, Ferdowsi university of Mashha, Mashhad, Iran
چکیده [English]

This study has investigated cadmium immobilization in the soil at the present of nano and micro titanium dioxid and the role of humic acid in nanoparticle stability and cadmium adsorption on nano and micro particles. The results of this study showed that in the soil contaminated with cadmium in suspension conditions, humic acid increased soluble cadmium in supernatant suspention and therfore increased cadmium availability in the soil. Modification of TiO2 nanoparticles surfaces with humic acid increases adsorption of cadmium at the nanoparticle surfaces. Also, since microparticles have reduced the soluble cadmium in supernatant suspensions and the concentration of exchangeable cadmium to a greater extend than nanoparticles, it can be concluded that the effect of microparticles in reducing available cadmium in the soil is greater than that of nanoparticles.

کلیدواژه‌ها [English]

  • nano and micro TiO2
  • cadmium fractionation
  • Humic Acid
  • soil suspention
  • nano particle stability
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