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حذف سرب از محلولهای آبی توسط ذرات پارامغناطیسی نانوارگانوکامپوزیت: مطالعه مدلهای سینتیک و همدمای جذب | ||
تحقیقات آب و خاک ایران | ||
دوره 54، شماره 6، شهریور 1402، صفحه 961-979 اصل مقاله (2.15 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2023.360233.669507 | ||
نویسندگان | ||
محبوبه ابوالحسنی زراعتکار* 1؛ حمیدرضا رفیعی سربیژن2 | ||
1گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان، ایران. | ||
2گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید باهنر کرمان، کرمان، ایران | ||
چکیده | ||
در این پژوهش جذب سرب توسط دو جاذب رس مونتموریلونیت (Mt) و ذرات پارامغناطیسی نانوارگانوکامپوزیت تهیه شده از رس مونتموریلونیت اصلاحشده با سورفکتانت آلی هگزادسیل تری متیل آمونیوم و نانوذرات مگنتیت (MagMt-H) بررسی شد. نانوارگانوکامپوزیت تهیه شده (MagMt-H) با استفاده از آنالیزهای پراش پرتو ایکس، طیف سنجی مادون قرمز تبدیل فوریه و میکروسکوپ الکترونی روبشی شناسایی شد. تاثیر غلظت اولیه بر جذب سرب از محلول آبی توسط دو جاذب بررسی شد. بهمنظور درک فرآیند جذب سرب از دو مدل همدمای جذب (لانگمویر و فروندلیچ) و مدلهای سینتیکی (شبه مرتبه اول، شبه مرتبه دوم، الوویچ و پخشیدگی درون ذرهای) استفاده شد. بررسی مدلهای همدما و سینتیک جذب نشان داد که جذب سطحی در نانوارگانوکامپوزیت از مدل همدمای لانگمویر و مدل سینتیکی شبه مرتبه دوم پیروی میکند. حداکثر ظرفیت جذب تکلایه تخمین زده شده از مدل لانگمویر در دمای 30 درجه سلسیوس برای نانوارگانوکامپوزیت (58/73 میلیگرم بر گرم) بسیار بیشتر از مقدار حاصل از رس مونتموریلونیت (54/49 میلیگرم بر گرم) میباشد. سرعت جذب اولیه (h) برای جاذب نانوارگانوکامپوزیت (MagMt-H) با مقدار 809/18 میلیگرم بر گرم در دقیقه نسبت به جاذب مونتموریلونیت (Mt) با مقدار 948/0 میلیگرم بر گرم در دقیقه نشاندهنده سرعت بسیار بیشتر جذب سرب بوسیله نانوارگانوکامپوزیت (MagMt-H) بود. نتایج این مطالعه نشان داد که نانوارگانوکامپوزیت تهیه شده بدلیل ایجاد مکانهای جذب جدید میتواند بهعنوان یک جاذب بسیار کارآمد و با ظرفیت جذب بالا و در مدت زمان کم برای حذف سرب از محلولهای آبی بهکار رود. | ||
کلیدواژهها | ||
جذب سرب؛ نانوارگانوکامپوزیت؛ سینتیک جذب؛ همدمای لانگمویر | ||
عنوان مقاله [English] | ||
Removal of Pb (II) from Aqueous Solution by Nano Organo-Composite Paramagnetic Particles: Study of Kinetic and Isotherm Models | ||
نویسندگان [English] | ||
Mahboobeh Abolhasani Zeraatkar1؛ Hamidreza Rafiei-Sarbijan2 | ||
1Department of Soil Science, Agriculture Faculty, Shahid Bahonar University of Kerman, Kerman, Iran. | ||
2Department of Soil Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Iran | ||
چکیده [English] | ||
The adsorption of lead on two adsorbents, montmorillonite clay (Mt) and magnetic nano organo-composite, was investigated in this study. The magnetic nano organo-composite has been developed by modifying montmorillonite clay with the organic surfactant Hexa decyltrimethylammonium bromide and adding magnetite nano-particles (MagMt-H). X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to identify the nano organo-composite (MagMt-H). Two adsorbents were used to investigate the effect of lead initial concentration on its adsorption from aqueous solution. To comprehend the process of Pb adsorption, two adsorption isothermal models (Langmuir and Freundlich) and kinetic models (Pseudo-first order, pseudo-second order, Elovich, and intraparticle diffusion) were used. Surface adsorption in the nano organo-composite follows the isothermal models of Langmuir, as well as the pseudo-second order kinetic model, according to an examination of isothermal models and adsorption kinetics. The maximum adsorption capacity calculated from the Langmuir model at 30 °C in the nano organo -composite (73.58 mg g-1) was significantly greater than the value obtained in montmorillonite clay (49.54 mg g-1). The initial absorption rate (h) for nano organo-composite adsorbent (MagMt-H) with a value of 18.809 mg g-1min-1 compared to the montmorillonite (Mt) adsorbent with a value of 0.948 mg g-1min-1 indicates a much higher rate of lead (II) adsorption by nano organo-composite (MagMt-H). The results of this research demonstrated that the nano organo-composite (MagMt-H) was easily prepared and that new adsorption sites were created at its interface, making it extremely effective for removing lead from aqueous solutions. | ||
کلیدواژهها [English] | ||
Adsorption kinetics, Lead adsorption, Langmuir isotherm, Nano organo-composite | ||
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