حذف آنیون کروم شش ظرفیتی از محلول‌های آبی با استفاده از ماده نانو حفره MCM-41 عامل‌دار شده با گروه آمینی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، ایران، مازندران، نور

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، ایران، مازندران، نور

3 استادیار پژوهشگاه مطالعات آموزش و پرورش، تهران، ایران

4 استاد گروه مهندسی معدن، بخش فراوری مواد معدنی، دانشگاه صنعتی استانبول، ترکیه

5 دانشیار گروه مهندسی شیمی، آزمایشگاه تحقیقاتی بیوتکنولوژی، دانشکده مهندسی شیمی، دانشگاه نوشیروانی بابل، ایران

6 دانشیار آزمایشگاه تحقیقاتی مواد نانو حفره، دانشکده شیمی، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در این پژوهش به‌منظور حذف کروم از محلول‌های آبی ماده نانو حفره MCM-41 آمین دار شده با استفاده از روش پیوندزنی پس سنتزی به‌وسیله گروه 3-آمینوپروپیل تری‌متوکسی‌سیلان تولید شد. آنالیزهای پراش پرتو ایکس، جذب- واجذب گاز نیتروژن، وزن‌سنجی حرارتی و طیف‌سنجی عبوری مادون قرمز فوریر (FT-IR)، تشکیل ماده میان‌حفره با ساختار منظم و عامل‌دار شدن با گروه آمین را تصدیق کرد. NH2-MCM-41 به‌عنوان جاذب برای حذف یون‌های کروم شش ظرفیتی از محلول‌های آبی استفاده شد. جذب در سیستم ناپیوسته برای ارزیابی اثر متغیرهای pH محلول، مقدار جاذب، غلظت یون‌های فلزی و دما انجام شد. نتایج به‌دست آمده نشان داد که با افزایش مقدار جاذب، درصد جذب افزایش و ظرفیت جذب کاهش یافت، به‌طوری که بیشترین میزان ظرفیت جذب 124 میلی‌گرم در گرم با مقدار جاذب 2/0 گرم در لیتر به‌دست آمد. همچنین pH برابر 3 به‌عنوان pH بهینه به‌دست آمد. بررسی تغییرات میزان جذب با افزایش غلظت یون‌های کروم نشان ‌داد که با افزایش غلظت، درصد جذب کاهش و میزان ظرفیت جذب افزایش می‌یابد. نتایج مطالعه ترمودینامیک نشان داد که فرایند جذب به شدت وابسته به دما است و ظرفیت جذب با افزایش دما افزایش یافت که بیانگر گرماگیر بودن و طبیعت خودبخودی فرایند جذب است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Removal of Cr(VI) from Aqueous Solutions Using mino-fuctionalized Nanoporous MCM-41

نویسندگان [English]

  • Farshid Ghorbani 1
  • Habibollah Younesi 2
  • Zahra Mehraban 3
  • Mehmet Sabri Ҫelik 4
  • Ali Asghar Ghoreishi 5
  • Mansour Anbia 6
1 PhD Student of Environmental Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor, Mazandaran
2 Assoc. Prof. of Environmental Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor, Mazandaran
3 Ass. Prof., Research Institute of the State Department of Education, Tehran, Iran
4 Prof. of Mineral Processing, Department of Mining Engineering, Istanbul University of Technology, Istanbul, Turkey
5 Assoc. Prof. of Chemical Engineering, Biotechnology Research Laboratory, Deptatrment of Chemical Engineering, Noushirvani University, Babol, Mazandaran
6 Assoc. Prof. of Nanoporous Materials Research Laboratory, Faculty of Chemistry, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

An amino-functionalized nanoporous material was prepared by grafting 3-aminopropyl trimethoxysilane (APTMS) group onto MCM-41. The as-synthesized material was characterized by X-ray diffraction (XRD) analysis, nitrogen adsorption-desorption measurements (BET), thermogravimetric analysis (TGA), and Fourier transform infrared spectrometry (FTIR) to confirm the ordered mesoporous structure and the functionalization of the amino group. The NH2-MCM-41 thus obtained was employed as the sorbent to remove Cr(VI) ions from aqueous solutions. The batch adsorption process was carried out to evaluate the effects of solution pH, adsorbent dosage, metal ion concentration, and temperature. Results revealed that removal efficiency increased to a maximum of 124 mg.g‒1 and metal uptake decreased (0.1 g.l‒1) with increasing sorbent dosage from 0.1 to 3.5 g.l‒1. A reverse trend was, however, observed with increasing Cr(VI) concentration. It was also found that a pH equal to 3 was the optimum level for the removal of Cr(VI) ions from aqueous solutions. Thermodynamic examinations revealed the strong dependence of the adsorption process on temperature such that adsorption capacity increased with increasing temperature, indicating the endothermic and spontaneous nature of the adsorption process.

کلیدواژه‌ها [English]

  • Nanoporous Material
  • Mesoporous Material
  • MCM-41
  • Batch Adsorption
  • Chromium (VI)
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