طراحی تکنیکی برای حرکت القایی نانوذرات جهت استخراج و اندازه‌گیری کادمیوم (II)، جیوه (III) و سرب (II) در نمونه‌های زیست‌محیطی با استفاده از آلومینای اصلاح‌شده با کیتوسان

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

گروه شیمی، دانشکده علوم پایه، دانشگاه هرمزگان، بندرعباس، ایران

چکیده

آلودگی محیط‌های آبی با فلزات سنگین و رنگ‌ها درنتیجه تخلیه فاضلاب‌های صنعتی یکی از جدی‌ترین مشکلات محیط‌زیست است. در این تحقیق نانو آلومینای پوشیده شده با کیتوسان به‌منظور حذف کاتیون‌های فلزات سنگین کادمیوم (II)، جیوه (III) و سرب (II) از نمونه‌های آب و فاضلاب‌های صنعتی بکار گرفته شد. از روش دینامیک جهت حذف آلاینده‌ها استفاده‌شده و اثر نمونه، سرعت‌های جریان نمونه‌ها و شوینده جاذب، نوع شوینده جاذب جهت بازیابی، موردمطالعه قرار گرفتند. ازآنجایی‌که نانوذرات آلومینا خود یکی از مهم‌ترین جاذب‌های آلاینده بشمار می‌آید، قرارگیری کیتوسان بر روی سطح آن به دلیل ایجاد کمپلکس با یون‌های فلزی باعث افزایش کارایی می‌شود. در این تحقیق از نانوذرات آلومینای اصلاح‌شده با کیتوسان که از جاذب‌های غیر مغناطیسی هستند، استفاده‌شده است که با قرارگیری در میدان مغناطیسی قوی با فرکانس بالا به‌صورت لحظه خاصیت مغناطیسی پیداکرده و مجدداً به حالت اولیه برمی‌گردند. با این اقدام در کاربرد صنعتی از هدر رفت نانو جاذب جلوگیری شده و راندمان بالایی به دست می‌آید. نانوذرات سنتزی توسط روش‌های SEM، FTIR و XRD موردبررسی قرار گرفتند. بیشینه جذب آلاینده‌ها در 6=pH، مقدار 03/0 گرم جاذب، سرعت 5 میلی‌لیتر بر دقیقه عبور محلول از ستون، اسید نیتریک 2 مولار به‌عنوان شوینده، حجم محلول mL 150 به‌عنوان حجم بهینه برای پیش تغلیظ و سرعت جریان 4 میلی‌لیتر بر دقیقه برای شوینده به دست آمد. ظرفیت جذب نانو آلومینای اصلاح‌شده با کیتوسان برای یون‌های کادمیوم، جیوه و سرب به ترتیب برابر با 91/4، 73/4 و 15/4 میلی‌گرم بر گرم به دست آمد. در این طرح اسپکترومتر جذب اتمی شعله‌ای جهت اندازه‌گیری مقدار یون‌های فلزی قبل و بعد از عمل حذف، مورداستفاده قرار گرفت. داده‌های به‌دست‌آمده نشان داد که روش ارائه‌شده به‌طور موفقیت‌آمیزی باعث حذف فلزات سنگین هدف در نمونه‌های فاضلاب صنعتی می‌شود

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Designing a technique for the induction movement of nanoparticles for the extraction and measurement of cadmium (II), mercury (III), and lead (II) in environmental samples using alumina modified with chitosan.

نویسندگان [English]

  • Seyed Mosayeb Daryanavard
  • seyed hassan Daryanavard
  • Vahid Ameri siyahooyi
Department of Chemistry, Faculty of Science, University of Hormozgan, Bandar-Abbas, Iran
چکیده [English]

Contamination of water environments with heavy metals and dyes as a result of industrial wastewater discharge is one of the most serious environmental problems. In this research, nano-alumina coated with chitosan was used to remove heavy metal cations of cadmium (II), mercury (III), and lead (II) from water and industrial wastewater samples. The dynamic method was used to remove the pollutants and the effect of the sample, the flow rates of the samples and absorbent detergent, and the type of absorbent detergent for recovery were studied. Since alumina nanoparticles are considered one of the most important pollutant absorbers, the placement of chitosan on its surface increases efficiency due to the formation of a complex with metal ions. In this research, alumina nanoparticles modified with chitosan, which are non-magnetic adsorbents, have been used, and when placed in a strong high-frequency magnetic field, they instantly become magnetic and return to their original state. With this action, in industrial application, the wastage of nano adsorbent is prevented and high efficiency is obtained. Synthetic nanoparticles were examined by SEM, FTIR, and XRD methods. The maximum absorption of pollutants at pH = 6, amount of adsorbent 0.03 g, speed of passing the solution through the column 5 ml/min, nitric acid 2 M as eluent, solution volume 150 mL as the optimal volume for pre-concentration and flow rate 4 ml/min for The detergent was obtained. The adsorption capacity of nano alumina modified with chitosan for cadmium, mercury, and lead ions was obtained as 4.91, 4.73, and 4.15 mg/g, respectively. In this project, a flame atomic absorption spectrometer was used to measure the number of metal ions before and after the removal process. The obtained data showed that the proposed method successfully removes target heavy metals in industrial wastewater samples.

کلیدواژه‌ها [English]

  • Heavy metal
  • Cadmium
  • Lead
  • Mercury
  • Alumina
  • Chitosan

This is an open access article under the CC-BY-SA 4.0 license.( https://creativecommons.org/licenses/by-sa/4.0/)

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