حذف رقابتی آلاینده های کاتیونی با استفاده از نانوجاذب های GO و GO-NH2 و مقایسه کارایی سیستم تک جزئی و دو جزئی

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده علوم محیطی، دانشگاه شهید بهشتی، تهران، ایران

چکیده

بسیاری از پساب‌های صنعتی حاوی آلایندههای کاتیونی متنوعی از جمله فلزات سنگین و رنگهای آلی با ساختارهای تجریه‌ناپذیر هستند که تهدید جدی برای سلامت عمومی و محیط زیست به‌شمار می‌روند. در مطالعه حاضر نانوجاذب‌های اکسید گرافن (GO ) و اکسید گرافن اصلاح شده با -3آمینو پروپیل تری اتوکسی سیلان  ( GO-NH2 )  به منظور حذف یون‌های فلزی سرب + ،)Pb2کادمیوم (+ )Cd2و رنگ کاتیونی متیلن بلو (MB ) در محلول‌های آبی در سیستم ناپیوسته تک جزئی و دوجزئی       (Pb2+-Cd2+، Cd2+-MB ،Pb2+-MB ) سنتز گردید. ساختار کریستالی و شیمی سطح نانوجاذب‌ها با استفاده از آنالیزهای پراش اشعه ایکس ( ،)XDRطیف سنج مادون قرمز (FTIR ) و میکروسکوپ الکترونی روبشی (SEM ) شناسایی گردید. در سیستم تک جزئی، بیشترین درصد جذب با استفاده از جاذب GOبرای 99 MBدرصد، 72/5 Cd+2درصد و 49/5 Pb+2 درصد به دست آمد. نتایج جذب سیستم تک جزئی با ،GONH2انتخاب پذیری + Cd2+>MB<Pb2با درصد جذب %73 ،%90 و %35را نشان داد. در سیستم جذب دوجزئی با ،GOدرصد جذب کادمیوم و سرب در مجاورت متیلن بلو نسبت به سیستم تکجزئی حدودا کاهش 10درصدی یافته است (Rq<1.) بر اساس محاسبه نسبت ظرفیت جذب (Rq,Cd2+=1) نشان می‌دهد که ظرفیت جذب + Cd2در حضور MBبا استفاده از GO-NH2تغییری نکرد. درحالی که درصد جذب + Pb2در سیستم جذب Pb2+-MBبر روی ، GO-NH2کاهش قابل توجهی داشته است (%15.) نتایج حاصل از سینتیک جذب MBبا استفاده از GOو + Pb2بر روی GO-NH2در سیستم تک جزئی نشان داد که سینتیک جذب نسبتا سریع و از نوع شبه درجه دوم بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Competitive Removal of Cationic Pollutants Using GO and GO-NH2 Nano-adsorbents and Efficiency Comparison of Single and Binary Component Systems

نویسندگان [English]

  • A. Shahbazi
  • Z. Salahshour
Environmental Sciences Research Institute, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Many industrial wastewater containing various cationic pollutants including heavy metals and organic dyes with non-degradable structures that are considered as a serious threat to public health and the environment. In this study, nano-absorbers including graphene oxide (GO) and graphene oxide modified with 3-aminopropyltriethoxysilane (GO-NH2) was successfully synthesized and characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) analysis. GO and GO-NH2 were applied to remove Pb2+ and Cd2+ metal ions, and methylene blue (MB) cationic dye from aqueous solution in single and binary component systems (Pb2+-Cd2+, Pb2+-MB, Cd2+-MB). In the single component system, the maximum absorption of 99%, 72.5% and 49.5% was obtained for MB, Cd2+ and Pb2+, respectively, by using GO. In the case of GO-NH2, maximum absorption of 90%, 73% and 35% was obtained for Pb2+, Cd2+ and MB, respectively, in single-component system. In the presence of MB dye, removal percentage of Pb2+ and Cd2+ showed a reduction of 10% compared to the single component system (Rq <1) by using GO. By using GO-NH2, in the metal-dye binary systems, the removal percentage of Pb2+ and Cd2+ showed a reduction of 15% and around zero, respectively, to the single component system. The adsorption rate of MB onto GO and Pb2+ onto GO-NH2 were in good agreement with pseudo-second order model (R2=99; k2=0.0002g mg-1 min-1, R2=95; k2=0.001g mg-1 min-1 respectively).

کلیدواژه‌ها [English]

  • GO
  • GO-NH2
  • Simultaneous Adsorption
  • Lead
  • Cadmium
  • Methylene blue

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 50، شماره 5
آذر و دی 1397
صفحه 919-928

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