نانومقیاس

نانومقیاس

سنتز سبز نانوکامپوزیت گرافن اکسید-نقره با استفاده از عصاره تمبر هندی: یک جاذب مناسب برای یون سرب(II)

نوع مقاله : مقاله پژوهشی

نویسندگان
1 آزمایشگاه تحقیقاتی شیمی معدنی، دانشکده شیمی، دانشگاه صنعتی شاهرود،شاهرود، ایران
2 آزمایشگاه تحقیقاتی شیمی معدنی، دانشکده شیمی، دانشگاه صنعتی شاهرود، شاهرود، ایران
چکیده
در این پژوهش، نانوکامپوزیت گرافن اکسید- نقره (Ag-GO) با استفاده از عصاره تمبر هندی (کاهنده سبز) تهیه شد. نانوکامپوزیت Ag-GO، بوسیله روش‌های متداول نظیر طیف سنجی فرو سرخ تبدیل فوریه (FT-IR)، الگوی پراش پرتو X ( XRD)، میکروسکوپ الکترونی روبشی (FE-SEM)، طیف سنجی پراش انرژی پرتو ایکس (EDS)، طیف سنجی رامان (Raman) و آنالیز حرارتی TGA شناسایی شد. نانوکامپوزیت تهیه شده به عنوان جاذب در فرآیند خروج یونهای سرب از محلول آبی استفاده گردید. فرآیند جذب سطحی یونهای سرب توسط نانوکامپوزیت Ag-GO و عوامل موثر بر این فرآیند جذب: نظیر غلظت و pH محلول سرب، مقدار جاذب (Ag-GO) مصرفی، زمان تماس جاذب با محلول و دمای فرآیند جذب مورد بررسی قرار گرفت. درصد خروج یونهای سرب و ظرفیت جاذب 50/0 میلی لیتر محلول سرب 125/0 میلی‌گرم بر لیتر و pH برابر با 5/0 در حضور 0/040 ‌گرم نانوکامپوزیت Ag-GO با زمان تماس 7 دقیقه به ترتیب برابر با 97/70 و 152/60 بود. از طرفی، شواهد تجربی، نشان می‌دهد که فرآیند جذب سطحی یون سرب بر بستر Ag-GO از سینتیک شبه درجه دوم پیروی می‌کند و مدل ایزوترم جذب لانگمویر را می‌توان برای آن در نظر گرفت.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Green synthesis of graphene oxide-silver nanocomposites using tamarindus indica extract: A suitable adsorbent for lead(II) ion

نویسندگان English

Akram Nejadi 1
Esmaiel Soleimani 2
1 Inorganic Chemistry Research Laboratory, Faculty of Chemistry, Shahrood University of Technology, Shahrood, Iran
2 Inorganic Chemistry Research Laboratory, Faculty of Chemistry, Shahrood University of Technology, Shahrood, Iran
چکیده English

In this research, graphene oxide-silver (GO-Ag) nanocomposites (NCs) was prepared using tamarindus indica extract (green reducer). These NCs was characterized by conventional methods such as Fourier Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction Pattern (XRD), Scanning Electron Microscopy (FE-SEM), X-ray Energy Diffraction Spectroscopy (EDS), Raman spectroscopy and TGA thermal analysis. The as-prepared NCs was used as an absorbent in the process of removing lead ions from aqueous solution. The surface absorption process of lead ions by GO-Ag NCs and the factors affecting this absorption process: such as the concentration and pH of the lead solution, the amount of adsorbent (GO-Ag) used, the contact time of the adsorbent with the solution and the temperature of the absorption process were investigated. The removal percentage of lead ions and adsorption capacity were 97.70 % and 152.60 mg/g for 50.0 mL of lead(II) solution 125.0 ppm and pH = 5.0 in the presence of 0.040 g of GO-Ag (2:1) with a contact time of 7 minutes, respectively. On the other hand, experimental evidence showed that the surface adsorption process of lead(II) ion on GO-Ag substrate follows pseudo-second order kinetics and the Langmuir adsorption isotherm model can be considered for it.

کلیدواژه‌ها English

Graphene oxide-silver NCs
tamarindus indica extract,
surface adsorption,
removal lead(II)ion,
green synthesis
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دوره 11، شماره 2
تابستان 1403
صفحه 60-44

  • تاریخ دریافت 27 اسفند 1402
  • تاریخ بازنگری 26 اردیبهشت 1403
  • تاریخ پذیرش 12 خرداد 1403