مقایسه کارایی فرآیند جذب مجزا و همزمان سرب و سم 2,4-D توسط نانوذرات دوعاملی مغناطیسی اکسید آهن از ماتریکس های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد گروه مهندسی بهداشت محیط، دانشکده بهداشت دانشگاه علوم پزشکی ایران

2 کارشناس ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی ایران،تهران، ایران

3 استاد مهندسی بهداشت محیط، دانشکدة بهداشت، دانشگاه علوم پزشکی ایران، تهران، ایران

4 استاد گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی ایران

5 دانشجوی کارشناسی ارشد بهداشت محیط، مرکز تحقیقات علوم و فناوری محیط زیست، دانشکدة بهداشت، دانشگاه علوم پزشکی شهید صدوقی یزد، تهران، ایران

چکیده

سابقه و هدف: امروزه با توجه به اثرات غیر قابل جبران فلزات سنگین و سموم بر اکوسیستم های آبزی، ارگانیسم ها و انسان ها، حذف آن ها از منابع آب بسیار حیاتی است. در سال های اخیر، روند جذب آلاینده ها با نانو ذرات مغناطیسی توجه زیادی به خود جلب کرده است. بنابراین مطالعه حاضر باهدف، سنتز نانوذره Fe3O4@SiO2-NH2-SH به‌عنوان یک جاذب جدید جهت حذف آلاینده های سرب و2,4-D از ماتریکس های آبی انجام گرفت.
مواد و روش‌ها: به منظور بررسی تاثیر متغیرهای pH(11-3)، زمان تماس(min150-0)، دوز جاذب (g/L2/1-2/0) و غلظت آلاینده ها (mg/L50-50) بر راندمان حذف و تعیین شرایط بهینه از روش One Factorial با کمک نرم افزار Design Expert استفاده گردید. جاذب به روش هم رسوبی شیمیایی سنتز گردید و سپس مورفولوژی آن با استفاده از دستگاه های TEM، XRD، FT-IR و SEM انجام گرفت. و در نهایت آزمایشات بر روی محلول آبی آزمایش گردید.
یافته‌ها: تجزیه و تحلیل ساختاری نشان داد که جاذب دارای ساختار کروی با هسته Fe3O4 و پوسته SiO2 است که توسط هر دو گروه عاملی آمین و تیول اصلاح شده است. نتایج آزمایشات نشان داد که بیشترین درصد حذف در سیستم مجزا برای سرب در pH برابر 5، زمان min40 و برای 2,4-D در pH برابر 6 و زمان min90 به دست آمد. همچنین در این سیستم مقادیر بهینه دوز جاذبg/L 8/0 و غلظت اولیه mg/L10 به دست آمد. در سیستم همزمان بیشترین درصد حذف در مقادیر بهینه pH برابر6 و زمان تماسmin 40 برای سرب وmin 60 برای 2,4-D و دوز جاذبg/L 2/1 تعیین گردید.
نتیجه‌گیری: طبق نتایج به دست آمده نانوذره سنتز شده چندمنظوره می تواند جاذب مناسبی برای حذف همزمان آلاینده های آلی و معدنی از محلول های آبی باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Efficiency comparison of single and binary mixture adsorption processes of lead (II) and 2, 4-D by bi-functional magnetic iron oxide nanoparticles from water matrix: kinetic studies

نویسندگان [English]

  • Ali Esrafili 1
  • Maryam Izanloo 2
  • Mahdi Farzadkia 3
  • Ahmad Joneidi Jafari 4
  • Mina Yousefi 5
1 Associate Professor, Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
2 Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran
3 Associate Professor, Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
4 Associate Professor, Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
5 MSc Student, Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences
چکیده [English]

Nowadays,due to the irreparable effects imposed on aquatic ecosystems,organisms and humans,the removal of heavy metals and herbicides from water sources has extremely become vital.In recent years, the process of adsorbing contaminants with magnetic nanoparticles has gained lots of attention.Therefore, the present study aimed to synthesize nanoparticles as an adsorbent for adsorption of the contaminants of Pb and 2,4-D from water. Materials and methods:To evaluate the effect of independent variables such as pH(3-11),contact time(0-150min),adsorbent dose(0.2-1.2g/L) and adsorbate concentration(5-50mg/L) on the contaminant removal and determine the optimal conditions, the method of one factor at the time was used by design expert software. Nanoparticles were synthesized via a co-precipitation method and their morphology were characterized by TEM,XRD,FT-IR and SEM. Finally, the experiments were performed on aqueous solution. Results: Structural analysis revealed that adsorbent has a spherical structure with a Fe3O4 core and SiO2 shell, modified by both amine and thiol functional groups.The results of experiments showed that the maximum adsorption efficiency of single system occurred at pH 5 and contact time 40 min for lead and at pH6 and contact time 90min for 2,4-D.Also the optimal values of adsorbent dose and initial concentration obtained 0.8 g/L and 10 mg/L. In the binary adsorption system,the maximum adsorption efficiency determined at pH 6 and contact time 40 min for lead and contact time 60 min for 2,4-D and adsorbent dose 1.2 g/L. Conclusion:According to the results,the bi-functional nanoadsorbent could be effectively used for the simultaneous removal of inorganic and organic pollutants from various aqueous solutions.

کلیدواژه‌ها [English]

  • adsorption
  • Fe3O4@SiO2-NH2-SH Np
  • lead
  • 2
  • 4-D
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