کارایی نانو ذرات ضایعات زغال‌سنگ اصلاح‌شده‌ با کلرید آهن در جذب فسفر از محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 بخش علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان، ایران.

2 دانشیار گروه علوم و مهندسی خاک، دانشگاه شهید باهنر کرمان

3 بخش مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، کرمان، ایران.

چکیده

یکی از بهترین روش­ها برای مدیریت­ ضایعات زغال­سنگ در راستای جلوگیری از انباشت آن‌ها در طبیعت و کاهش آلودگی­های محیط‌زیست، کاربرد آن‌ها به‌عنوان جاذب آلاینده­ها است. این پژوهش با هدف بررسی قابلیت و رفتار جذبی ضایعات زغال­سنگ به سه شکل پودری خام (cp)، نانو ذرات (cnp) و نانو ذرات اصلاح‌شده با کلرید آهن (mcnp) در جذب فسفر از محلول آبی انجام شد. مشخصه­یابی جاذب­ها با استفاده از آنالیزهای دستگاهی نظیر XRD، SEM-EDS، و FTIR صورت پذیرفت. مطالعات جذب سطحی فسفر به روش تعادلی در سیستم بسته انجام و تأثیر عواملی نظیر pH، غلظت اولیه فسفر و زمان تماس بررسی شد. نتایج نشان داد که فرآیند جذب فسفر، یک فرآیند وابسته به pH بوده و بیشترین جذب فسفر برای هر سه جاذب در محدوده pH=2-6 اتفاق افتاد. بیشترین درصد حذف فسفر در محدوده غلظت اولیه صفر تا 50 میلی­گرم بر لیتر مشاهده شد. کارایی حذف فسفر توسط جاذب­های مورد مطالعه با گذشت زمان، افزایش و پس از 2 ساعت به تعادل رسید. درصد حذف فسفر توسط cp، cnp و mcnp به ترتیب 3/3، 18 و 8/78 درصد محاسبه شد. مدل­های سینتیکی شبه­رده اول و شبه­رده دوم و مدل هم­دمای لانگمویر داده­های جذب سطحی فسفر توسط جاذب­های مورد مطالعه را به خوبی توصیف کردند. حداکثر ظرفیت جذب فسفر برای cp، cnp و mcnp به ترتیب برابر با 37/0، 97/3 و 39/30 میلی­گرم بر گرم محاسبه شد. نتایج این پژوهش نشان داد که ضایعات زغال­سنگ اصلاح‌شده، قابلیت استفاده به‌عنوان یک جاذب مقرون به صرفه و دوست­دار محیط‌زیست را دارا هستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Efficiency of Coal Waste Nanoparticles Modified with FeCl3 in Sorption of Phosphorous from Aqueous Solutions

نویسندگان [English]

  • SOMAYEH HOSSEINPOOR 1
  • Majid Hejazi-Mehrizi 2
  • HASSAN HASHEMIPOOR RAFSANJANI 3
  • MOHAMMAD HADI FARPOOR 1
1 Department of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
2 Soil science, Faculty of Agriculture, Shahid Bahonar Univ. of Kerman
3 Department of Chemical Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
چکیده [English]

One of the best methods for managing coal wastes to prevent their accumulation in nature and reduce environmental pollution is their application as the sorbents of pollutants. The objective of this study was to investigate the capability and behavior of the coal wastes in three forms of pristine powder (cp), nanoparticles (cnp) and FeCl3 modified nanoparticles (mcnp) for phosphorous (P) sorption from aqueous solution. Characterization of the sorbents was carried out using XRD, SEM-EDS and FTIR analyses. Equilibrium sorption experiments were done in batch systems and the effects of pH, initial P concentration and contact time were studied. The results showed that the P sorption process was pH dependent and the maximum P sorption occurred at 2-6 pH ranges. The maximum P removal efficiency of the sorbents obtained in the range of 0-50 mg/L of initial P concentration and it was increased with time and reached equilibrium after 2 hours. The P removal efficiencies of the sorbents were determined to be 3.3, 18 and 78.8 % for cp, cnp and mcnp, respectively. The pseudo-first and pseudo-second order kinetic models and Langmuir isotherm described the P sorption data well. The maximum P sorption capacities were calculated to be 0.37, 3.97 and 30.39 mg/g for cp, cnp and mcnp, respectively. Results revealed that the modified coal wastes have the potential to use as cost-effective and environmental-friendly sorbents.

کلیدواژه‌ها [English]

  • Phosphorous Removal
  • Coal wastes
  • kinetics
  • Isotherms
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