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کارایی نانو ذرات ضایعات زغالسنگ اصلاح‌شده با کلرید آهن در جذب فسفر از محلول‌های آبی | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 5، دوره 51، شماره 7، مهر 1399، صفحه 1667-1679 اصل مقاله (779.15 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2020.298293.668510 | ||
| نویسندگان | ||
| سمیه حسین پور1؛ مجید حجازی مهریزی* 2؛ حسن هاشمی پور رفسنجانی3؛ محمدهادی فرپور1 | ||
| 1بخش علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان، ایران. | ||
| 2دانشیار گروه علوم و مهندسی خاک، دانشگاه شهید باهنر کرمان | ||
| 3بخش 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 | ||
| حذف فسفر؛ ضایعات زغالسنگ؛ سینتیک؛ هم‌دما | ||
| عنوان مقاله [English] | ||
| The Efficiency of Coal Waste Nanoparticles Modified with FeCl3 in Sorption of Phosphorous from Aqueous Solutions | ||
| نویسندگان [English] | ||
| SOMAYEH HOSSEINPOOR1؛ Majid Hejazi-Mehrizi2؛ HASSAN HASHEMIPOOR RAFSANJANI3؛ MOHAMMAD HADI FARPOOR1 | ||
| 1Department of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran. | ||
| 2Soil science, Faculty of Agriculture, Shahid Bahonar Univ. of Kerman | ||
| 3Department 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 | ||
| مراجع | ||
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