نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی بهداشت محیط و عضو مرکز تحقیقات تکنولوژی بهداشت محیط، دانشگاه علوم پزشکی ایران، تهران

2 دانشجوی دورة دکترا مهندسی بهداشت دانشگاه علوم پزشکی ایران، تهران- ایران و عضو هیئت علمی دانشگاه علوم پزشکی سبزوار، سبزوار- ایران گروه مهندسی بهداشت محیط، دانشکدة بهداشت دانشگاه علوم پزشکی سبزوار، سبزوار، ایران

چکیده

زمینه و هدف: فنل و مشتقات آن به طور وسیع در صنایع پتروشیمی، شیمائی و داروسازی استفاده می شود، فاضلاب این صنایع پایش شده است که حاوی غلظت بالای از ترکیبات فنل می‌باشد که ایجاد خطرات برای زندگی ابزیان و انسان می‌کند بنابراین فاضلاب‌های حاوی فنل قبل از دفع پساب بایستی تصفیه شوند.
روش کار: ایروژل هیبریدی با ساختار ابگریزی با استفاده از روش سل – ژل تهیه شد و به روش محیطی خشک گردید، و برای حذف فنل از آب به کار گرفته شد، تاثیر پارامترهای چون غلظت، زمان تماس و دوز جاذب بررسی شد، و مطالعات سنتیتیکی و ایزوترمی جهت ارزیابی تاثیر متغیرها به کار گرفته شد. سطح ویژه ایروژل با استفاده جذب نیتروزن در 77 درجه کلوین توصیف شد.
یافته‌ها: نتایج نشان داد که حداکثرظرفیت جذب ایروژل در غلظتmg/l 250 ، mg/g13/493بود. سطح ویژه ایروژل سنتز شده 2/g m543 ، سایز حفرات 3.24 ناومتری با درصد تخلخل44 و زاویه تماس 156 درجه است و سنتیتک از درجه دوم و ایزوترم جذب از مدل لانگمیر تبعیت می‌کند.
نتیجه گیری: نتایج نشان داد که فرایند جذب فنل شامل هر دو پدیده لایه مرزی و انتشار درون ذره ای است. همچنین دلیل اصلی برای کارائی جذب بالا فنل، سطح آبدوستی و آبگریزی ایروژل سنتز شده می‌باشد

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The potential of efficiency aerogel hybrid (Carbon + Silica) in the removal of phenol from aqueous solutions and studying isothermal studies, the traditional

نویسندگان [English]

  • ahmad jonodi 1
  • Ayoob Rastegar 2

1 Professor of Environmental Health Engineering and member of Environmental Health Technology Research Center, Iran University of Medical Sciences, Tehran, Iran

2 PhD Student, Department of Environmental Health Engineering, Iran University of Medical Sciences, Tehran, Iran, faculty of Environmental Health Engineering, Sabzevar University of Medical Sciences, sabzevar, Iran

چکیده [English]

Back ground: Phenol and its derivatives are widely used as raw material in many petrochemical, chemical and pharmaceutical industries. Wastewaters from the industries mentioned above contain Phenolic compounds which are highly hazardous to aquatic life. Therefore, phenolic wastewaters must be specially treated before disposing off the effluents

Materials and methods: Hybrid aerogel with structure of hydrophobicity was prepared through sol–gel synthesis followed by drying at ambient. The aerogel was used for phenol adsorption from water and the effects of phenol concentration, also contact time were studied. Batch kinetic and isotherm studies were carried out to evaluate the effects of contact time and phenol concentration The Aerogel surface was characterized by nitrogen adsorption at 77 K.
Results: The result showed that the maximum adsorption was in the concentration 250 mg L− 1 493/13 mg g− 1. The specific surface area of the synthesized aerogel is 543.4 g m-2, the pore size is 3.24 nm with a porosity of 44 and a contact angle of 156 degrees, The Langmuir model and the pseudo-second-order fited the experimental data
Conclusion: the results showed that the phenol adsorption process involved both boundary layer diffusion and inter particle diffusion that hydrophilic and hydrophobic surface of the aerogel is synthesized
main reason for its higher adsorption efficiency phenol.

کلیدواژه‌ها [English]

  • phenol
  • aerogel
  • hybrid
  • isotherm
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