جذب سطحی آنیون سیانید از محلول‌های آبی با استفاده از نانوجاذب اکسید روی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده شیمی، پردیس علوم، دانشگاه یزد، یزد، ایران

2 گروه شیمی، دانشکده علوم پایه، دانشگاه آیت الله بروجردی، بروجرد، ایران

3 بخش تحقیقات گیاه‌پزشکی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان یزد، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران

چکیده

در این تحقیق، جذب سطحی آنیون‌ سیانید از محلول‌های آبی بر روی نانوذرات اکسید روی و عوامل مؤثر بر آن مورد مطالعه قرار گرفته است. این عوامل شاملpH  اولیه محلول، غلظت اولیه یون سیانید در محلول، مقدار جاذب، مدت زمان تماس و دما می­باشند. شرایط بهینه جذب آنیون سیانید بر روی نانوجاذب اکسید روی عبارتند از: 6pH=، زمان تماس80 دقیقه، مقدار جاذب 07/0 گرم، دمای 15 درجه سلسیوس و غلظت اولیه 250 میلی‌گرم بر لیتر. تحت این شرایط بهینه، بیشترین درصد جذب آنیون سیانید بر روی نانوذرات اکسید روی 96 درصد به‌دست آمد. همچنین، نتایج نشان داد که برازش داده­های تجربی با هم‌دمای لانگمویر نسبت به هم‌دماهای فروندلیچ و تمکین سازگاری بیشتری با فرایند جذب سطحی دارد و حداکثر ظرفیت جذب در این فرایند برابر با 85/24 میلی‌گرم بر گرم جاذب است. به علاوه، مطالعات سینتیکی نشان داد که جذب سطحی آنیون‌ سیانید بر روی نانوجاذب اکسید روی، مرتبه دوم است.

کلیدواژه‌ها


عنوان مقاله [English]

Adsorption of Cyanide Anion from Aqueous Solutions Using Zinc Oxide Nano-adsorbent

نویسندگان [English]

  • Mahdi Ghanatroo 1
  • Hossein Mohammadi-Manesh 1
  • Azamsadat Ghoroghchian 1
  • Hossein Dashti Khavidaki 2
  • Seyed Reza Fani 3
1 Department of Chemistry, Faculty of Sciences, Yazd University, Yazd, Iran
2 Department of Chemistry, Faculty of Basic Sciences, Ayatollah Boroujerdi University, Boroujerd, Iran
3 Plant Protection Research Department, Yazd Agricultural and Natural Resources Research and Education Center, AREEO, Yazd, Iran
چکیده [English]

Adsorption of cyanide ion from aqueous solutions using zinc oxide nanoparticles and the affecting factors such as pH, concentration of cyanide ion, adsorbent dosage, contact time and temperature have been studied in this paper. The optimal conditions for adsorption of cyanide anion on nano zinc oxide were obtained at pH=6, contact time 80 min, adsorbent dosage 0.07g, temperature 15°C and initial concentration of 250 mg/l. Under these optimal conditions, the highest percentage of adsorption of cyanide was obtained to be 96%. Moreover, the results showed that experimental data is best fitted with Langmuir isotherm equation rather than Freundlich and Temkin isotherms. The maximum adsorption capacity obtained about 24.85 mg/g. In addition, kinetic studies showed that the adsorption of cyanide anion on nano-adsorbent zinc oxide complied well with second-order kinetics model.

کلیدواژه‌ها [English]

  • Cyanide anion
  • Adsorption
  • Nano-adsorbent
  • Zinc oxide Nanoparticles
  • Adsorption isotherms
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