تأثیر نانوذرات تیتانیم دی‎اکسید بر دینامیک کربن در خاک آلوده به آنتیموان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان، زنجان، ایران.

2 هیت علمی مرکز تحقیفات آذربایجان شرقی

3 استادیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه.

چکیده

فلزات سنگین با آلوده کردن خاک و تغییر ویژگی‎های شیمیایی و بیولوژیکی آن دینامیک کربن آلی را تحت تأثیر قرار می‎دهند. برای این منظور آزمایشی به‎صورت اسپیلیت فاکتوریل با سه تکرار به اجرا در آمد. آنتیموان در چهار سطح (صفر، 25، 50 و 100 میلی‎گرم بر کیلوگرم)، نانوذره TiO2 به‎عنوان جاذب در سه سطح (صفر، 25/0 و 5/0 درصد وزنی) و فاکتور زمان هم در هشت سطح (ماه اول تا ماه هشتم) فاکتورهای آزمایش را تشکیل ‎دادند. نتایج نشان داد که از ماه اول تا ماه هشتم انکوباسیون، تنفس پایه کاهش یافت و بیش‎ترین میزان تنفس پایه از ماه اول انکوباسیون و کم‎ترین آن نیز در ماه هشتم انکوباسیون با اختلاف معنی‎داری برابر با 81/27 درصد حاصل شد. بیش‎ترین و کم‎ترین سرعت تجزیه مواد آلی به‎ترتیب در تیمارهای شاهد و 50 میلی‎گرم بر کیلوگرم آنتیموان بدون کاربرد نانوذره با اختلافی برابر با 6/16 درصد به‎دست آمد. با افزایش سطوح آنتیموان، ثابت سرعت تجزیه مواد آلی به‎شدت کاهش یافت ولی هم‎زمان با افزایش سطوح آلایندگی کاربرد 5/0 درصد وزنی نانوذره باعث افزایش سرعت تجزیه مواد آلی گردید. بیش‎ترین نیمه‎عمر و متوسط اقامت کربن در خاک در تیمار 50 میلی‎گرم بر کیلوگرم بدون کاربرد جاذب و کم‎ترین آن نیز از تیمار 25 میلی‎گرم بر کیلوگرم به‎همراه کاربرد 5/0 درصد وزنی جاذب حاصل شد. با توجه به نتایج این پژوهش می‎توان اظهار داشت که کاربرد 5/0 درصد وزنی جاذب TiO2 ثابت سرعت تجزیه مواد آلی را افزایش ولی نیمه‎عمر و متوسط اقامت کربن در خاک را کاهش داد. در سطوح بالاتر آلاینده (100 میلی‎گرم بر کیلوگرم آنتیموان) نسبت به سطوح پایین (50 و 25 میلی‎گرم بر کیلوگرم) سطح جاذب به‎دلیل اشباع شدگی با آلاینده کارایی خود را از دست داد، لذا در سطوح بالاتر آلاینده باید از سطوح جاذب (TiO2) بیش‎تر از 5/0 درصد وزنی استفاده شود.
 

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Titanium Dioxide Nanoparticles on Carbon Dynamics in Antimony-Contaminated Soil

نویسندگان [English]

  • Nader Khadem Moghadam Igdelou 1
  • Ahmad Golchin 1
  • Ahmad bybordi 2
  • Ali Beheshti Ale Agha 3
1 department of soil science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran.
2 Soil and Water Research Department, East Azerbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran.
3 Assistant Professor of Soil Science Department, Faculty of Agriculture, University of Razi, Kermanshah, Iran
چکیده [English]

Heavy metals affect the dynamics of organic carbon by contaminating soil and altering its chemical and biological properties. For this purpose, a split factorial experiment was conducted with three replications. Experimental factors included Antimony at four levels (0, 25, 50, and 100 mg/kg), TiO2 nanoparticles as an adsorbent at three levels (0, 0.25, and 0.5 % by weight), and time at eight levels (the first month to the eighth month). Results showed that the basal respiration decreased from the first month to the eighth month of incubation and the highest basal respiratory rate was obtained from the first month of incubation and the lowest one was belong to the eighth month of incubation with a significant difference of 27.81%. The highest and the lowest organic matter degradation rates were obtained in control and 50 mg/kg antimony without nanoparticle application with 16.57% difference. By increasing antimony levels, the rate of degradation of organic matter decreased sharply, but by increasing the levels of contaminant, the application of 0.5 % (w/w) nanoparticles caused to increase the rate of organic matter decomposition. The highest value of half-life and mean residence time of carbon in the soil were obtained from 50 mg/kg without adsorbent treatment and the lowest value was obtained from 25 mg/kg with 0.5% (w/w). According to the results of this study it can be stated that the application of 0.5 % (w/w) TiO2 adsorbent increased the rate of decomposition of organic matter but decreased the half-life and mean residence time of carbon in the soil. At the higher contaminant levels (100 mg/kg of antimony), compared to the lower levels (50 and 25 mg/kg), the adsorbent surface lost its efficiency because of saturation with the contaminant, therefore for higher level of contaminant application, higher level of adsorbent (more than the 0.5% (w/w) TiO2) should be used.

کلیدواژه‌ها [English]

  • carbon dioxide
  • Degradation rate
  • equation
  • half-life
  • mean residence time
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