حذف 4- کلروفنل از محیط‌های آبی با استفاده از جاذب نانوساختار اکسید گرافن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران

2 مربی، دانشکده بهداشت، دانشگاه علوم پزشکی کردستان، سنندج، ایران

3 دانشجوی کارشناسی ارشد، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران

چکیده

در این تحقیق اکسید گرافن به‌عنوان یک جاذب نانو ساختار با خواص بهتری نسبت به سایر جاذب‌ها برای حذف 4-کلروفنل از محیط آبی مورد بررسی قرار گرفت. اکسید گرافن با روش هامر سنتز شد. برای شناسایی مورفولوژی و ساختار جاذب از روش‌های پراش‌سنجی پرتو ایکس و تصویر میکروسکوپ پراش الکترونیکی استفاده شد. متغیرهای مؤثر بر فرایند جذب از جمله غلظت اولیه 4-کلرو فنل، مقدار جاذب و pH به‌روش تغییر یک عامل در زمان بررسی شد. در انتها داده‌ها با ایزوترم‌های لانگمیر و فروندلیچ مطابقت داده شد. فرایند جذب در زمان 20 دقیقه به تعادل رسید. مقدار 4/0گرم در لیتر اکسید گرافن در زمان 5 دقیقه و pH برابر 8 توانست 10 میلی‌گرم در لیتر 4-کلروفنل را تا90 درصد حذف نماید. ایزوترم لانگمیر، فرایند جذب را به‌خوبی توصیف نمود. مقدارR2  معادل 99/0و RL برابر با 34/0 به‌دست آمد.فرایند جذب به‌وسیله جاذب اکسید گرافن از فرایندهای ارزان قیمت با راندمان بالا است و می‌توان از آن در کاهش و از بین بردن آلاینده‌های محیطی و ‌به‌ویژه محیط‌های آبی استفاده نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Removal of 4-Chlorophenol from Aqueous Solutions Using Graphene Oxide Nanoporous Adsorbent

نویسندگان [English]

  • akbar eslami 1
  • ahmad reza yazdanbakhsh 1
  • hiua daraei 2
  • fateme sofi karimi 3
3 Employee / Central Boukan Health
چکیده [English]

In this study, graphene oxide was used as a nanostructured adsorbent with properties supposedly better than other common adsorbents to remove 4-chlorophenol from aqueous solutions. For this purpose, graphene oxide was initially synthesized using the Hummer's method and x-ray diffraction and scanning electron microscopy were employed to identify its morphology and structure. The variables involved in the absorption process (including 4-chlorophenol initial concentration, adsorbent dosage, and pH) were investigated based on the one-factor-at-a-time method. Eventually, the data were confirmed against the Langmuir and Freundlich isotherms. It was found that the adsorption process reached equilibrium in 20 minutes. A dosage of 0.4 g/L graphene oxide at pH=8 brought about 90% removal of 10 mg/L 4-chlorophenol within 5 minutes. The adsorption isotherm was described well by the Langmuir isotherm model and the values for R2 and RL were recorded as 0.99 for and 0.34, respectively. Being a low cost and highly efficient process, the adsorption process using graphene oxide adsorbent may be recommended for the reduction and elimination of pollutants in the environment, especially those in aqueous solutions.

کلیدواژه‌ها [English]

  • graphene oxide
  • Nanoporous
  • Adsorption
  • 4-Chlorophenol
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