استفاده از اکسید گرافن مغناطیسی آمین‌دار سنتز شده از گیاه Typha latifolia برای حذف سرب به روش سطح پاسخ

نوع مقاله : مقاله پژوهشی

نویسندگان

استادیار، گروه محیط‌زیست، دانشکده منابع طبیعی، دانشگاه زابل، زابل، ایران

چکیده

امروزه آلودگی محیط‌زیست و کاهش آب شیرین قابل‌دسترس، از مهم‌ترین مشکلات محیط‌زیستی ناشی از افزایش شهرنشینی و صنعتی شدن است. بر این اساس، هدف از انجام این پژوهش، سنتز گرافن اکسید مغناطیسی آمین‌دار ) mGO-NH2) از ساقه گیاه آبزی لویی Typha latifolia به‌عنوان جاذب فلز سرب به‌روش سطح پاسخ (RSM) بود. در این پژوهش، گرافن از ساقه‌ گیاه آبزی لوئی Typha latifolia به‌روش راکتور حرارتی CVD سنتز و پس از انجام مراحل اکسیداسیون و مغناطیسی، با گروه‌های عاملی آمین، عامل‌دار شد. سپس به‌منظور حصول اطمینان از سنتز نانوجاذب، ویژگی‌های ساختاری آن توسط آنالیزهای FTIR، AFM،Raman ، SEM، ZETA potential و pHZPC بررسی شد. در ادامه، پس از بهینه‌سازی فاکتور pH، تأثیر هریک از فاکتورهای زمان (X1)، غلظت سرب (X2) و مقدار جاذب (X3)، بر کارایی اکسیدگرافن مغناطیسی آمین‌دار شده (mGO-NH2) در حذف یون‌های سرب از محلول آبی، به‌وسیله معادله درجه‌ دوم به‌روش RSM و طرح مرکب مرکزی (CCD) بررسی شد. بر اساس نتایج حاصل از تصویر SEM، تصویر AFM، آنالیز Raman و طیف FTIR، سنتز نانوجاذب تأیید شد. مقدار بیشینه ظرفیت جذب برابر mg/g29/164 (mg20= X3، mg/L20 = X2 و min120 = X1) حاکی از هم‌راستا بودن نتایج آزمایش‌ها با مقدار پیش‌بینی شده مدل بود. بر اساس مدل فروندلیچ و ردلیچ-پیترسون، فرایند جذب نیز از نوع برهم‌کنش شیمیایی با سطح نامتجانس جاذب بود. پژوهش‌ ترمودینامیک نیز حاکی از گرماگیر بودن فرایند جذب بود. نتایج این بررسی نشان داد که ساقه گیاه لویی می‌تواند به‌عنوان گزینه مناسبی در سنتز گرافن مورد استفاده قرار گرفته و mGH-NH2 حاصل، کارایی مؤثری در جذب یون‌های سرب از محلول‌های آبی دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Pb (II) from Aqueous Solution Using Response Surface Methodology with Aminated Magnetic Graphene Oxide Synthesized from Typha Latifolia

نویسندگان [English]

  • Fatemeh Einollahipeer
  • Narjes Okati
Assist. Prof., Dept. of Environment, Faculty of Natural Resources, University of Zabol, Zabol, Iran
چکیده [English]

Today, environmental pollution and less accessibility of freshwater have been a serious challenge due to industrialization and urbanization. Therefore, the aim of this study was to investigate the synthesis of aminated magnetic graphene oxide (m-GO-NH2) from Typha latifolia and its application for Pb (II) removal from aqueous solution. The m-GO-NH2 was synthesized from steam of T. latifolia by using CVD and applied to Pb (II) removal. The structure of synthesized nano adsorbent was characterized by using SEM, FTIR, AFM, Raman spectroscopy and pHZPC. After finding the optimum amount of pH, central composite design was applied to survey the effect of time (X1), initial concentration of Pb (II) (X2) and adsorption dosage (X3) for Pb (II) removal from aqueous solution. Two quadratic models were developed to estimate the amount of Pb (II) removal efficiency with design expert software.  According to the SEM, FTIR, AFM, Raman analysis, the mGO-NH2 was successfully synthesized. The amount of 164.29 mg/g of Pb (II) removal at operation conditions (X1=120min, X2=35mg/L and X3=20 mg/L) indicated an excellent agreement with the model amount predicted. Regarding the thermodynamic studies, the adsorption procedure was spontaneous and endothermic and followed Freundlich isotherm and Redlich-Peterson (R-P) equations. In conclusion, it is affirmed the m-GO-NH2 as synthesized from T. latifolia, has a high capability for use in adsorption of Pb (II) from aqueous solution.

کلیدواژه‌ها [English]

  • Isotherms Models
  • Thermodynamic
  • Adsorption
  • Central composite design
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