حذف آلاینده‌های آلی از آب به کمک نانولوله‌های کربنی ارتقایافته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار و عضو هیئت علمی مؤسسه آموزش‌ عالی آب و برق، پژوهشگاه نیرو، تهران، ایران

2 دانش‌آموخته دکترا، رشته مهندسی عمران گرایش محیط‌زیست، دانشگاه تهران، تهران، ایران

چکیده

آلاینده‌های آلی محلول در آب مانند ترکیبات کلره، بی‌فنیل‌ها و آلدرین‌ها ناشی از شوینده‌ها، علف‌کش‌ها و سموم، در فرایندهای متعارف تصفیه مانند فیلتراسیون قابل حذف نیستند. نانولوله‌های کربنی قابلیت زیادی برای جداسازی آلاینده‌های آلی دارند، ولی کاربرد دوغابی آن به‌دلیل نیاز به حذف در انتهای تصفیه، مطلوب نیست. در این پژوهش، نانولوله‌های کربنی ارتقایافته متصل به ذرات ماسه فیلترهای شنی (CNTsand) سنتز و برای حذف آلاینده‌های آلی استفاده شد. ظرفیت و کارایی این نانولوله‌ها و متغیرهای مؤثر بر آن شامل pH، دما، زمان تماس و غلظت بررسی شد. همچنین، سینتیک واکنش و ایزوترم‌های جذب تحلیل شد. نتایج نشان داد CNTsand، ظرفیت بالایی برای حذف آلاینده‌های آلی دارد. پردازش داده‌ها نشان‌گر مدل سینتیکی شبه‌مرتبه دوم برای واکنش حذف بود و با ایزوترم لانگمیر بیشترین هم‌خوانی را داشت. تغییر آنتالپی واکنش برابرΔH=11.02 kJ/mol و تغییر انرژی آزاد از ΔG برابر 32/7- تا kJ/mol 20/9- همگی حاکی از واکنش گرماگیر و از نظر ترمودینامیکی خودبه‌خودی بود. بنابراین، کفایت و کارایی پوشش نانولوله‌ای ارتقا‌یافته روی دانه‌های ماسه در حذف آلاینده آلی تأیید شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of Organic Pollutants from Water by Improved Carbon Nanotubes

نویسندگان [English]

  • Mohammad Reza Fadaei Tehrani 1
  • Saeed Skandari 2
1 Assist. Prof. and Faculty Member of the Higher Education Institute of Water and Electricity, Energy Research Institute, Tehran, Iran
2 PhD. Graduated Student, Civil Engineering, Environmental Orientation, University of Tehran, Tehran, Iran
چکیده [English]

Organic pollutants soluble in water such as chlorine compounds, biphenyls and aldrins caused by dyes, detergents, herbicides and toxins cannot be removed in conventional purification processes such as filtration. Carbon nanotubes have a high ability to separate organic pollutants, but its slurry application is not desirable due to the need to remove them at the end of purification. In the present study, upgraded carbon nanotubes attached to particles of sand filters (CNTsand) were synthesized and used to remove organic pollutants. The capacity and efficiency of these nanotubes and the variables affecting it including pH, temperature, contact time and concentration were investigated. Also, reaction kinetics and adsorption isotherms were analyzed. The results showed that CNTsand has a high capacity to remove organic compounds. The data processing showed the pseudo-second order kinetic model for the elimination reaction and the Langmuir isotherm was the most consistent. The reaction enthalpy change equal to ΔH=11.02 kJ/mol and the free energy change from ΔG=-7.32 to -9.20 kJ/mol both indicate an endothermic and thermodynamically spontaneous reaction. Therefore, the adequacy and efficiency of the upgraded nanotube coating on sand grains in removing organic pollutants was confirmed.

کلیدواژه‌ها [English]

  • Organic Pollutants
  • Carbon Nanotube
  • Water Refinery
  • Sand Filter

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مجله آب و فاضلاب
دوره 34، شماره 4 - شماره پیاپی 147
مهر و آبان 1402
صفحه 1-21

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