نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مهندسی مواد و متالورژی، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران.

2 استاد، مهندسی مواد و متالورژی ، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران.

10.22068/jstc.2020.112782.1581

چکیده

در این تحقیق، سنتز نانوکامپوزیت مزوپروس سیلیکا‏/ اکسیدآهن (MCM-41/γ-Fe2O3) با روش هیدروترمال انجام شده و سپس کاربرد این نانوکامپوزیت به عنوان جاذب در حذف یون‏های نیکل، کادمیوم، کروم، سرب و روی از محلول آبی بررسی شده است. همچنین، تاثیر pH محلول، زمان تماس و دوز جاذب بر درصد حذف مورد مطالعه قرار گرفته است. نتایج نشان می‏دهد که جذب این یون‏ها بر سطح جاذب، با افزایش pH محلول، زمان تماس و دوز جاذب افزایش می‏یابد. بیشترین درصد حذف یون‏های فلزی سنگین در شرایط pH=5، t=50 دقیقه و 0.16 گرم جاذب (شرایط آزمایش کنونی) بوده است که مقادیر 53، 79، 61، 89 و 99.5% به‌ترتیب برای یون‏های نیکل، روی، کادمیوم، کروم و سرب از محلول آبی به دست آمد. نانوکامپوزیت مزوپروس سیلیکا/اکسیدآهن سنتز شده توسط آنالیزهای پراش‏ اشعه ایکس(XRD)، طیف‏سنجی تبدیل فوریه مادون قرمز(FTIR)، مغناطیس سنج نمونه ارتعاشی(VSM)، جذب- واجذب گاز نیتروژن(BET) و میکروسکوپ الکترونی روبشی نشر میدانی (FE-SEM) مورد شناسایی قرار گرفت. اندازه‏ گیری غلظت یون‏های فلزی محلول، توسط دستگاه طیف‏سنج جذب اتمی (AAS) انجام گرفت. طبق نتایج بدست آمده، نانوکامپوزیت MCM-41/γ-Fe2O3 دارای مساحت سطحی بالا (461.19m2/g)، حجم کل حفرات 0.4128cm3/g، میانگین قطر حفره 3.58nm، توزیع باریک اندازه حفرات و رفتار سوپرپارامغناطیسی می‏ باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Synthesis, characterization and application of mesoporous silica/maghemite nanocomposite in removal of heavy metal ions from aqueous solution

نویسندگان [English]

  • Shirin Kalantari 1
  • Mohammad Amini 1
  • Ali Shokuhfar 2

1 Department of Materials Science and Engineering, K.N. Toosi University of Technology, Tehran, Iran.

2 Department of Materials Science and Engineering, K.N. Toosi University of Technology, Tehran, Iran.

چکیده [English]

In the present study, mesoporous silica/iron oxide nanocomposite (MCM-41/γ-Fe2O3) was prepared with hydrothermal method and then the application of the nanocomposite as an adsorbent for the removal of Ni(II), Cd(II), Cr(III), Pb(II) and Zn(II) ions from aqueous solution was investigated. Furthermore, the effects of the solution pH, contact time and adsorbent dosages on removal percentage were studied. The results indicated that the adsorption of these ions on the surface of the adsorbent increase with increasing of solution pH, contact time and adsorbent dosage. The maximum percent removal (in the condition of: pH=5, t=50min, w=0.16g) of Ni(II), Zn(II), Cd(II), Cr(III) and Pb(II) ions was reached 53, 79, 61, 89 and 99.5%, respectively. The synthesized mesoporous silica/iron oxide nanocomposite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), nitrogen adsorption-desorption (BET) and Field Emission Scanning electron microscopy (FE-SEM). The concentrations of metal ions of the solutions were measured by atomic absorption spectroscopy (AAS). According to the results, MCM-41/γ-Fe2O3 nanocomposite exhibited a large surface area 461.19m2/g, a total pore volume 0.4128cm3/g, a mean pore diameter 3.58nm, a narrow pore size distribution and the superparamagnetic behavior.

کلیدواژه‌ها [English]

  • Nanocomposite
  • Mesoporous silica
  • Iron oxide
  • Magnetic Properties

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