بررسی سینتیک جذب فسفات توسط بیوچار باگاس نیشکر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری بخش علوم خاک، دانشکده کشاورزی دانشگاه شیراز

2 دانشیار بخش علوم خاک دانشکده کشاورزی دانشگاه شیراز

چکیده

کاربرد بیوچار حاصل از بقایای کشاورزی به‌عنوان جاذب یکی از روش‌های مقرون به صرفه و پرکاربرد برای حذف آلاینده‌هایی همچون فسفات از منابع آب می‌باشد. باگاس در واقع همان تفاله نیشکر است که در مناطق جنوبی کشور ایران به وفور یافت می‌گردد. هدف از این مطالعه بررسی سینتیک جذب فسفات توسط بیوچار باگاس نیشکر و تعیین بهترین مدل سینتیکی برای تفسیر این واکنش بود. پس از تعیین pH بهینه، تأثیر غلظت اولیه فسفات و زمان تماس بر جذب فسفات توسط بیوچار باگاس نیشکر بررسی و از 7 مدل سینتیکی جذب برای بررسی جذب فسفات استفاده گردید. حداکثر میزان جذب فسفات در زمان دو ساعت به‌دست آمد. مدل‌های سینتیکی تابع نمایی، الوویچ ساده شده، پخشیدگی سهموی و مرتبه اول با داده‌های حاصله تطابق نشان دادند که از میان آن‌ها معادله تابع نمایی اولویت داشت. نیمه عمر جذب فسفات در غلظت‌های مختلف از 30 دقیقه تا 100 دقیقه متفاوت بود و با افزایش غلظت اولیه فسفات کاهش یافت. با افزایش غلظت اولیه فسفات میزان جذب آن توسط جاذب و همچنین ثابت‌های سرعت جذب افزایش یافتند. مقادیر بالای ضرایب جذب فسفات نشان داد  که بیوچار باگاس نیشکر می‌تواند جاذب مناسبی برای حذف فسفات از محلول‌های آبی آلوده باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Phosphate Sorption Kinetics by Sugar Cane Bagasse Biochar

نویسندگان [English]

  • SH Karami 1
  • R Ghasemi 2
1 Ph.D. Student, Dept. of Soil Science, Faculty of Agriculture, Shiraz University, Iran
2 Assoc. Prof., Dept. of Soil Science, Faculty of Agriculture, Shiraz University, Iran
چکیده [English]

Application of agricultural residue biochars as an adsorbent is one of the most cost-effective and widely used methods to remove contaminants such as phosphate from water resources. In fact, the bagasse is the waste residues of sugar cane which is abundant in southern parts of Iran. The aim of this study was to investigate the kinetics of phosphate adsorption by bagasse biochar and determine the best kinetic model to interpret this phenomenon. After determining optimal pH, the effects of initial phosphate concentration and contact time on phosphate adsorption by sugarcane bagasse biochar were investigated and 7 kinetic models were used to study the patterns of P adsorption. Maximum adsorption obtained at the time of two hours. Kinetic models of the exponential function, parabolic diffusion, Elovich and first order reaction were compatible with the results but the exponential function model was the best. The half-life of phosphate adsorption in different concentrations varied from 30 minutes to 100 minutes and decreased with increasing initial P concentration. P adsorption rate constants increased as initial concentration of phosphate increased. High values of P adsorption parameters demonstrated that the sugar cane bagasse biochar could be used as an appropriate adsorbent for phosphate removal from aqueous solutions.

کلیدواژه‌ها [English]

  • Adsorbent
  • Biochar
  • Contamination
  • Exponential function
  • Half-life 
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