تعیین شرایط بهینه ظرفیت جذب و درصد جذب یون‌های سیانید با استفاده از گل قرمز فعال‌شده

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی معدن و متالورژی، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این تحقیق حذف یون‌های فرو سیانید و فری سیانید از پساب سنتزی با گل قرمز فعال شده مورد مطالعه قرار گرفت. از دو روش فعال سازی با استفاده از آمونیاک  ( ABA)و سورفکتانت کاتیونی ستیل تری متیل آمونیوم برماید ( ABC) استفاده شد. برای بررسی فرایند جذب یون‌های سیانید و پارامترهای مؤثر در آن، 44 آزمایش با هفت عامل متغیر با به کارگیری نرم افزار DX8 و بر اساس روش طراحی آزمایش سطح- پاسخ طراحی و انجام شد. نتایج تحلیل آزمایش‌ها نشان داد که شرایط بهینه فرایند برای دست یابی به بیشترین ظرفیت جذب با جاذب ABC در شرایط pH محلول 1/ 7، با غلظت اولیه ppm126 ، مقدار جاذب 57 / 0 گرم، زمان 78 / 96 دقیقه، سرعت هم زدن rpm120 و قدرت یونی 24 / 0 مولار است. در حالت بهینه ظرفیت جذب معادل 5/ 19 میلی گرم بر گرم و درصد جذب معادل 3/ 99 % به دست آمد. نتایج به دست آمده نشان داد که استفاده از گل فعال شده ABC در حذف یون‌های سیانید از محلول کار آیی بالاتری دارد. مطالعات تر مودینامیکی در شرایط بهینه انجام شد. نتایج نشان داد که مقدار منفی پارامترهای Δ◦G در دماهای مختلف نشان دهنده خود به خودی بودن فرآیند جذب کمپلکس سیانیدی بر جاذب های ABA و ABC است. به طوری که با افزایش دما فرآیند خود به خودی جذب افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Optimum condition determination of adsorption capacity and adsorption percentage of cyanide ions using activated red mud

نویسندگان [English]

  • N. Deihimi
  • Mehdi Irannajad
  • B. Rezai
Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

In this study, removal of ferrocyanide and ferricyanide ions from synthetic wastewater with activated red mud was studied. Two activation methods by ammonia (ABA) and cationic surfactant of cetyl trimethylammonium bromide (ABC) were used. In order to evaluate the process of cyanide ion adsorption and its effective parameters, 44 experiments were designed with seven variable factors using DX8 software by the response surface method. The results showed that the optimum conditions for achieving the highest adsorption capacity with ABC adsorbent were obtained as follows: pH=7.1, adsorbent dosage of 0.57 g, ferricyanide concentration of 126 ppm, contact time of 96.66 min, agitated speed of 120 rpm and ion strength of 0.24 M. In optimum conditions, the absorption capacity of 19.5 mg/g and the absorption percentage of 99.3% were obtained. The results showed that the use of ABC adsorbent has a higher efficiency in the removal of cyanide ions from the synthetic wastewater. Thermodynamic studies were carried out in optimal conditions. The results showed that the negative value of ΔG◦ parameters at different temperatures indicates the spontaneity of the cyanide complex adsorption process on adsorbents of ABA and ABC. The spontaneity of process increased with increasing the temperature.

کلیدواژه‌ها [English]

  • Adsorption
  • Cyanide
  • Red mud
  • CTAB
  • Thermodynamics

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 51، شماره 2
خرداد و تیر 1398
صفحه 377-388

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