ویژگی های جذبی نیترات بر کربن فعال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد گروه علوم و مهندسی خاک پردیس کشاورزی و منابع طبیعی دانشگاه تهران

2 عضو هیئت علمی گروه علوم و مهندسی خاک پردیس کشاورزی و منابع طبیعی دانشگاه تهران

3 عضو هیئت علمی مؤسسة تحقیقات خاک و آب کرج

چکیده

در این تحقیق توانایی کربن فعال (ساخت شرکت مریک) به منزلة جاذب برای خارج‏سازی نیترات از آب‏های آلوده ارزیابی شد. برای این منظور سینتیک و هم‌دمای جذب نیترات، اثر زمان‏ تماس، غلظت‏ اولیه، Ph، و دما در جذب نیترات بر کربن فعال بررسی شد. همچنین، خصوصیات سطحی کربن فعال به وسیلة FTIR و میکروسکوپ الکترونی مطالعه شد. از دو مدل سینتیکی ساده‌شدة شبه‌مرتبة اول و شبه‌مرتبة دوم برای توصیف داده‌های سینتیکی و همچنین مدل فروندلیچ و لانگمویر برای توصیف داده‌های هم‌دمای جذب استفاده شد. نتایج این تحقیق نشان داد مقدار جذب نیترات با زمان افزایش یافت و بعد از 10 دقیقه به حداکثر مقدار خود رسید. حداکثر جذب نیترات در pH خنثی بود و با افزایش یا کاهش pH میزان جذب کاهش یافت. مقدار جذب نیترات با کاهش دما افزایش یافت که می‏تواند نشان‏دهندة گرمازا بودن واکنش جذب نیترات بر کربن فعال باشد. مقایسة ضرایب تعیین معادلات برازش‌شده نشان داد معادلة شبه‌مرتبة دوم (000/1 R2=) بهتر از معادلة شبه‌مرتبة اول (839/0 R2=) می‏تواند دادة سینتیکی جذب نیترات را توصیف کند. هم‌دمای جذب به‌خوبی با مدل لانگمویر توصیف شد (998/0 R2=) و حداکثر جذب 93/8 میلی‏گرم بر گرم کربن فعال بود.

کلیدواژه‌ها

عنوان مقاله [English]

Characteristics of Nitrate Sorption onto Activated Carbon

نویسندگان [English]

  • Mostafa Marzi 1
  • Mohsen Farahbakhsh 2
  • Karim Shahbazi 3
1 Graduate Student, , Department of Soil Science, College of Agriculture and Natural Resources, University of Tehran
2 Assistant professor, Department of Soil Science, College of Agriculture and Natural Resources, University of Tehran
3 Member of Scientific Board, Soil and Water Research Institute, Karaj
چکیده [English]

The potential of activated carbon (a product of Merck) as an adsorbent has been studied for removal of nitrate from some polluted water sources. In line with this purpose, nitrate sorption kinetics and isotherms, as well as the effects of contact time, initial concentration, pH and temperature on nitrate sorption onto activated carbon were investigated. The surface characteristics of activated carbon were also studied, through FTIR and SEM techniques. Two simplified kinetics models, namely: pseudo-first and pseudo-second orders were tested to investigate the sorption mechanisms and while two isotherm models namely Freundlich and Langmuir employed to describe the equilibrium sorption of nitrate onto activated carbon. The results revealed that the amount of nitrate sorption increased with time and reached its maximum after ten minutes past. Maximum nitrate sorption occurred in a neutral pH figure, and with either increase or decrease in the pH level, the amount of sorption being decreased. The amount of nitrate sorption increased with a decrease in temperature, level, the depicting the exothermic nature of sorption. A comparison of the coefficient of determination of the fitted equations indicated that pseudo-second order equation (R2=1.000) was better fitting than pseudo-first order equation (R2=0.839) for description of nitrate sorption data. Sorption isotherm was proper, as described by Langmuier model (R2=0.998) and the maximum sorption parameter equaled 8.93 mg per gr of activated carbon.

کلیدواژه‌ها [English]

  • activated carbon
  • Isotherm
  • Kinetics
  • Nitrate
  • sorption

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