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بررسی جذب فسفر از محلول آبی توسط زغالهای زیستی چوب نخل و باگاس نیشکر تهیه شده در دماهای مختلف گرماکافت | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 7، دوره 51، شماره 3، خرداد 1399، صفحه 617-628 اصل مقاله (814.92 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2019.291920.668380 | ||
| نویسندگان | ||
| علی کرایی1؛ عبدالامیر معزی* 2؛ سعید خدادوست3 | ||
| 1دانشجوی دکتری، گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران | ||
| 2دانشیار گروه علوم خاک دانشگاه شهید چمران اهواز | ||
| 3استادیار 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 | ||
| دمای گرماکافت؛ جاذب آلی؛ سینتیک جذب؛ همدما | ||
| 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 Koraei1؛ Abdolamir Moezzi2؛ Saeid Khodadoust3 | ||
| 1Ph.D. Student, Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran | ||
| 2Associate Professor, Department of Soil Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz | ||
| 3Assistant 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 | ||
| مراجع | ||
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