بررسی جذب فسفر از محلول‌ آبی توسط زغال‌های زیستی چوب نخل و باگاس نیشکر تهیه شده در دماهای مختلف گرماکافت

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانشیار گروه علوم خاک دانشگاه شهید چمران اهواز

3 استادیار گروه شیمی، دانشکده علوم، دانشگاه صنعتی خاتم الانبیا، بهبهان، بهبهان، ایران

چکیده

پتاسیل زغال­زیستی در جذب ترکیبات و عناصر از محلول­های آبی به ویژگی­های زغال­زیستی و شرایط تولید آن بستگی دارد. هدف این پژوهش، بررسی کارایی جذب فسفر از محلول­های آبی توسط زغال­های ­زیستی چوب نخل و باگاس نیشکر تهیه شده در دماهای مختلف گرماکافت بود. بدین منظور زغال­­های زیستی در دماهای متفاوت گرماکافت (250، 400 و 550 درجه سلسیوس) تهیه شدند و ویژگی­های فیزیکی و شیمیایی آن­ها اندازه­گیری شد. آزمایش­های پیمانه­ای برای بررسی سینتیک جذب و همدمای جذب فسفر توسط زغال­زیستی انجام شد. سپس داده­های به­دست آمده با مدل­های هم­دمای جذب (لانگ­مویر و فروندلیچ) و سینتیک جذب (شبه­درجه اول، شبه درجه دوم و پخش درون ذره­ای) برازش داده شدند. همچنین تاثیر غلظت­های مختلف فسفر (25 تا 500 میلی گرم در لیتر) و pH محلول بررسی شد. نتایج نشان داد به­طور کلی کارایی جذب فسفر توسط زغال­های ­زیستی باگاس نیشکر بیش­تر (2/22 تا 3/35 درصد) از زغال­­های زیستی چوب نخل بود و با افزایش دمای گرماکافت، جذب فسفر توسط زغال­های زیستی افزایش یافت. بیشترین مقدار جذب فسفر (94/46 میلی­گرم بر گرم) مربوط به زغال­زیستی باگاس نیشکر تهیه شده در دمای°C  550، بود. مدل فروندلیچ بهترین برازش را برای داده­های همدمای جذب فسفر توسط زغال­زیستی نشان داد (0043/0=RMSE و 96/0=2R). نتایج همچنین نشان داد مدل شبه درجه دوم بهترین برازش را برای داده­های سینتیک جذب فسفر (99/0 =2R) داشت. با توجه به نتایج این پژوهش می­توان نتیجه­گیری کرد زغال­زیستی تهیه شده از باگاس نیشکر در دمای 550 درجه سلسیوس کارایی بالایی در جذب فسفر از محلول­های آبی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Study of Phosphorous Adsorption from Aqueous Solution by Date Wood and Sugarcane Bagasse Biochars Produced at Different Pyrolysis Temperature

نویسندگان [English]

  • Ali Koraei 1
  • Abdolamir Moezzi 2
  • Saeid Khodadoust 3
1 Ph.D. Student, 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 Assistant Professor, Department of Chemistry, Faculty of Science, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
چکیده [English]

The potential of biochar for pollutant removal from aqueous solution greatly depends on biochar characteristics and its production conditions. The objective of this research was to investigate the efficiency of phosphorous adsorption from aqueous solution by date wood and sugarcane bagasse biochars produced at different pyrolysis temperature. For this purpose, biochars were produced at different temperatures (250, 400, 550 ˚C) and their physio-chemical characteristics were measured. Batch experiments performed to evaluate equilibrium and kinetics phosphate adsorption on biochars surface. Then, experimental data of phosphate adsorption were analyzed using the kinetic (Pseudo First-order, Pseudo second-order, and intra-particle diffusion) and the adsorption isotherm (Langmuir, Freundlich) models. In addition, the effect of various initial phosphate concentrations (25–500 mg L-1) and solution pH was investigated. The results indicated that the removal efficiency of sugarcane bagasse biochars was more than the date wood and increased with increasing of pyrolysis temperature. The sugarcane bagasse biochar produced at 550 ˚C, had maximum phosphorus adsorption from aqueous solution (46.94 mg g-1). Freundlich model showed the best fit for experimental data of phosphate adsorption onto biochar with R2=0.96 and RMSE=0.004. The results also revealed that Pseudo second-order kinetic model (R2 = 0.99) had the best fit for phosphate adsorption data. According to the results of this study, it can be concluded that the sugarcane bagasse biochar produced at 550 ˚C has high efficiency for removal phosphate from aqueous solution.

کلیدواژه‌ها [English]

  • Pyrolysis temperature
  • Organic adsorbent
  • Kinetic adsorption
  • Isotherm
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