جذب مس از محلولهای آبی با پسماند چای اصلاح شده با نانو ذرات مگنتیت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز

2 استادیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز

3 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت و عضو مرکز تحقیقات فناوری‌های محیط زیستی، دانشگاه علوم پزشکی جندی شاپور، اهواز

4 استادیار گروه شیمی، دانشکده علوم، دانشگاه شهید چمران، اهواز

چکیده

آلودگی آب و خاک به فلزات سنگین تهدیدی جدی برای محیط زیست و سلامت بشر است. یافتن روشی مؤثر برای پالایش این فلزات از آب اهمیت فراوانی دارد. هدف از انجام این پژوهش امکان‌یابی اصلاح پسماندهای چای با نانو ذرات مگنتیت و بررسی کارایی آن برای حذف فلز مس از محلولهای آبی بود. به این منظور جاذب طبیعی از پسماند چای تولید و با نانو ذرات مگنتیت اصلاح گردید. ویژگی‌های جاذب با استفاده از  SEMو طیف سنجی مادون قرمز تعیین شدند. اثر پارامترهای مختلف مانند زمان تماس، pH محلول مس، غلظت فلز و غلظت جاذب بر شدت حذف مس بررسی گردید. نتایج نشان داد با افزایش pH از 2 تا 5 ، درصد حذف مس از 87 به 98 درصد افزایش یافت و حداکثر جذب در pH برابر 5 حاصل شد. با افزایش غلظت اولیه مس، درصد حذف آن از 5/98 به 89 درصد کاهش و با افزایش مقدار جاذب، درصد حذف به 6/94 درصد افزایش یافت. همچنین نتایج نشان داد که جذب فلز مس از هر دو مدل همدمای لانگمیر و فروندلیچ پیروی می‌کند. ظرفیت جذب لانگمیر 4/22 میلی‌گرم بر گرم به‌دست آمد. به‌طور کلی نتایج این پژوهش نشان داد پسماندهای چای اصلاح شده با نانو ذرات مگنتیت توانایی بالایی در حذف مس از آبهای آلوده دارند. همچنین جداسازی جاذب پس از حذف فلزات آسان است.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Cu(II) from Aqueous Solution by Modified Tea Waste with Magnetic Nanoparticles

نویسندگان [English]

  • Seyyedeh Masoumeh Hosseini 1
  • Ahmad Farrokhian Firouzi 2
  • Aliakbar Babaei 3
  • Fariba Heidarizadeh 4
چکیده [English]

Water and soil pollution by heavy metals is a serious threat to environment and human health. Therefore finding an effective method for removing heavy metals from water is very important. Removal of heavy metals from water by adsorption method has increasingly received much attention in recent years because it is simple relatively low-cost and effective method. The main objective of this research is to investigate the possibility of removing Cu(II) from aqueous solution using modified tea waste with magnetite nanoparticles. Consequently, modified tea waste with magnetite nanoparticles were prepared and characterized by Atomic Force Microscopy (AFM) and Fourier Transform Infrared Spectroscopy (FTIR). The effects of various parameters, such as contact time, pH, Cu concentration and adsorbent dosage were studied. The adsorption isotherm data were fitted to Langmuir and Freundlich equation. The results indicated that the sorption data can be represented by both Langmuir and Freundlich isotherm models, and the Langmuir adsorption capacity, was found to be 22.4 mgg−1. The results indicated that Cu(II) adsorption increased with increasing solution pH. Maximum removal of Cu(II) was obtained at pH=5.5. The results also showed the adsorption were decreased by increasing of initial Cu(II) concentration. An increase in adsorbent dosage increased the removal of Cu(II). The results also revealed that modified tea waste with magnetite nanoparticles can be an attractive option for metal removal from contaminated water.

کلیدواژه‌ها [English]

  • Removal of Cu
  • Modified Tea Waste
  • Adsorption Isotherm
  • Magnetite Nanoparticle
  • Aqueous solution
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