ارزیابی توانایی بیوچار نی اصلاح شده با کلرید آهن در جذب نیترات از محلول آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

2 دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران

3 استادیار گروه علوم و مهندسی خاک دانشگاه شهید چمران اهواز، اهواز، ایران

4 استادیار گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران

چکیده

در سال­های اخیر استفاده از بیوچار اصلاح شده جهت پالایش آلاینده­های معدنی مانند نیترات، مورد توجه قرار گرفته است. با توجه به افزایش غلظت نیترات در منابع آب و پیامدهای زیست­محیطی ناشی از آن­، در این پژوهش کارایی بیوچار اصلاح شده نی در جذب نیترات از محلول­ آبی بررسی شد. بدین منظور، زیست­توده گیاه نی با استفاده از محلول کلرید آهن یک مولار اصلاح شد، سپس در دمای 500 درجه سلسیوس گرماکافت شد و ویژگی­های فیزیکوشیمیایی آن اندازه­گیری گردید. آزمایش­­­های جذب نیترات به­صورت پیمانه­ای بررسی شدند. نتایج نشان داد، در اثر اصلاح بیوچار با کلرید آهن عملکرد، ظرفیت تبادل کاتیونی، ظرفیت تبادل آنیونی و سطح ویژه بیوچار افزایش یافت. کارایی جذب نیترات با افزایش زمان افزایش یافت، در حالی که افزایش غلظت اولیه نیترات در محلول با کارایی جذب این یون­ها رابطه عکس نشان داد. مدل­ سینتیکی شبه درجه دوم، توصیف مناسبی از سرعت جذب نیترات در بیوچار تهیه شده در دمای 500 درجه سلسیوس (98/0R2 =) و بیوچار اصلاح شده با آهن (99/0R2 =) ارائه داد. مدل­ لانگمویر (99/0R2 =) بهترین برازش را برای داده­های جذب نیترات در هر دو نوع بیوچار نشان داد. به‌طورکلی، نتایج این پژوهش نشان­دهنده توانایی بالای بیوچار نی اصلاح شده با آهن برای جذب نیترات (30/81 میلی­گرم بر گرم) بود. بنابراین می­توان نتیجه­گیری کرد بیوچار اصلاح شده نی پتانسیل بالایی در حذف نیترات از منابع آبی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Nitrate Sorption Potential from Aqueous Solution Using Common Reed-Iron Modified Biochar

نویسندگان [English]

  • Shila Khajavi-Shojaei 1
  • Abdolamir Moezzi 2
  • Mojtaba Norouzi Masir 3
  • Mehdi Taghavi zahedkolaei 4
1 Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Associate Professor, Department of Soil Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz
3 Associate Professor, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
4 Assistant Professor, Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده [English]

 In recent years using modified biochar has been considered as an adsorbent to removal of inorganic pollutants such as nitrate from aqueous solution. Because of the increase of nitrate concentration in water resources and its environmental consequences, in this study the efficiency of nitrate adsorption by iron-modified common reed biochar from aqueous solution was investigated. For this purpose common reed biomass was modified by one molar iron chloride solution and then pyrolyzed at 500 °C and its physicochemical characteristics were measured. Nitrate adsorption was evaluated in batch experiments. The results indicated that the yield, cation exchage capacity (CEC), anion exchange capacity (AEC) and surface area of the biochar increased through modification by iron chloride. The adsorption efficiency of nitrate increased by increasing contact time, but it reduced by increasing initial concentration of nitrate in the solution. The pseudo-second-order kinetics model provided a good description for adsorption processes of biochar produced at 500 ºC (R2= 0.98) and iron modified biochar (R2= 0.99). Among the adsorption isotherms, Langmuir model (R2= 0.99) illustrated the best fit with the experimental data for both biochars. In general, the results of this study showed the high potential of iron-modified biochar for nitrate sorption (81.30 mg g-1). Thus, it could be concluded that the iron-modified biochar has high potential for nitrate removal from aqueous solutions.

کلیدواژه‌ها [English]

  • Isotherm
  • kinetics
  • nitrogen
  • Organic adsorbent
  • Pollution
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