کارایی نانولوله‌های کربنی تک دیواره پوشیده شده با ذرات اکسید روی در حذف آلاینده BTEX از محلول‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی شیمی، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران

2 استادیار، گروه شیمی کاربردی، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران

چکیده

مونوآروماتیک‌های بنزن، تولوئن، اتیل بنزن و زایلین که به اختصار BTEX نامیده می‌شوند، از آلاینده‌های زیست محیطی بسیار مهم به‌شمار می‌آیند. قابلیت حل شدگی  BTEX در آب زیاد است و این نوع آلودگی در محیط‌های آبی با سرعت بسیار زیادی منتشر می‌شوند. یکی از روش‌های مورد توجه در تصفیه، فرایند جذب توسط نانولوله‌های کربنی به‌عنوان یک روش نوین است. هدف از این پژوهش حذف BTEX به روش جذب سطحی با استفاده از نانولوله‌های کربنی تک دیواره پوشیده شده با نانو ذرات اکسید روی از محلول‌های آبی بود. نانو کامپوزیت تهیه شده با استفاده از FTIR،XRD ،FESEM  وEDAX  شناسایی شد. pH نقطه صفر بار جاذب تعیین شد. سپس تأثیر پارامترهای عملیاتی مختلف با هدف به دست آوردن شرایط مطلوب برای انجام فرایند جذب از جمله مقدار نانوجاذب، زمان تماس، pH، دما و قدرت یونی محلول به روش ناپیوسته مطالعه شد. شرایط مطلوب برای حذف توسط نانولوله‌های کربنی در 20 دقیقه تماس، pH برابر 6، مقدار جاذب 10 میلی‌گرم، دمای 20 درجه سلسیوس و غلظت نمک 2 گرم در لیتر به‌دست آمد. نتایج این پژوهش نشان داد که نانولوله‌های کربنی تک دیواره پوشیده شده با اکسید روی به‌طور مؤثری بنزن، تولوئن، اتیل بنزن و زایلن را از آب جذب می‌نماید و دارای پتانسیل خوبی برای تصفیه فاضلاب‌های آلوده به مواد نفتی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of BTEX Removal from Aqueous Solution by Single Wall Carbon Nanotubes Coated with ZnO

نویسندگان [English]

  • Maryam Zahednia 1
  • Zohreh Ghazi Tabatabaei 2
1 MSc Stdudent, Department of Chemical Engineering, Ahar Branch, Islamic Azad University, Ahar, Iran
2 Assist. Prof., Department of Applied Chemistry, Ahar Branch , Islamic Azad University, Ahar, Iran
چکیده [English]

Monoaromatics of Benzene, Toluene, Ethyl Benzene and Xylene which are abbreviated as BTEX, are among the most important environmental pollutants. Due to high solubility of BTEX in water, it is emitted to the aquatic environment with a very high speed. Absorption by carbon nanotubes is be regarded as one new treatment method. The aim of this study was to investigate the removal of BTEX from aqueous solutions through adsorption by single wall carbon nanotubes coated with Zinc oxide nanoparticles. The prepared nanoparticles were characterized by FT IR, XRD, FESEM and EDAX. First, the pHZPC was determined. Then, the effect of different operating parameters such as the amount of sorbent, contact time, pH, temperature and ionic strength were studied through batch method in order to obtain optimal conditions for the absorption process. The optimum conditions for BTEX removal from aqueous solution by ZnO/SWCNTs was obtained as following: pH=6, contact time=20 min, adsorbent concentration=300 mg/L, amount of sorbent=10mg, T=20°C and salt concentration= 2g/L. The results showed that single wall carbon nanotubes coated with zinc oxide effectively absorbs BTEX from water and it has a good potential for treating wastewater contaminated with petroleum

کلیدواژه‌ها [English]

  • BTEX
  • Single Wall Carbon Nanotubes
  • Nanoparticles
  • Adsorption
  • Water Pollution
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