تأثیر پراکسیدها و فرآیند شستشو بر قابلیت جذب هیدروژن در چارچوب فلزی آلی MOF-5 سنتز شده به روش اختلاط مستقیم

نویسندگان

1 گروه پژوهشی مواد غیرفلزی، پژوهشگاه نیرو، تهران، ایران

2 پژوهشگاه مواد و انرژی، کرج، ایران

چکیده

 در این تحقیق تأثیر پراکسید هیدروژن و پراکسید بنزوئیل بر ویژگی‌های ساختاری و خصوصیات سطحی چارچوب فلزی آلی MOF-5و(Zn4O(BDC)3) مورد بررسی قرار گرفته است. برای این منظور چارچوب فلزی آلی به روش اختلاط مستقیم سنتز شده و در ادامه به‌منظور بهبود ویژگی‌های MOF-5 سنتز شده، نسبت‌های مولی پیش ماده‌ها نسبت به لیگاند برای به حداقل رساندن خطای محاسبات استوکیومتری و همچنین فرآیند شستشو اصلاح شد. با هدف مشخصه‌یابی ترکیبات سنتز شده و بررسی اثر پراکسیدها و فرآیند شستشو بر خواص نمونه‌ها، اندازه‌گیری‌های پراش پرتو ایکس، طیف‌سنجی مادون قرمز با تبدیل فوریه و آنالیز جذب و واجذب نیتروژن انجام گرفت. با توجه به آزمون‌های انجام شده، نمونه سنتز شده با حضور پراکسید بنزوئیل و همچنین با روش شستشو اصلاح شده (DM-P-03) دارای ویژگی‌های ساختاری، تخلخل، منافذ فعال و مساحت سطح ویژه مطلوب‌تری در مقایسه با نمونه سنتز شده با پراکسید هیدروژن است. در این نمونه متوسط اندازه بلورک 18/5 نانومتر، سطح ویژه 2307 مترمربع بر گرم، مجموع حجم حفره‌ها 1/212 سانتی‌متر مکعب بر گرم و میانگین قطر حفره‌ها 2/101 نانومتر است. بنابراین نمونه DM-P-03 به‌عنوان نمونه بهینه انتخاب شده و برای انجام آزمون‌های ریزساختاری و وزن سنجی-گرماسنجی افتراقی آماده‌سازی شد. بر اساس تصویر میکروسکوپی الکترونی گسیل میدانی این نمونه از ذرات کوچک شبه کروی نامنظم تشکیل شده و شکل‌گیری این ریزساختار به حضور پراکسید بنزوئیل نسبت داده شده است. با توجه به آنالیز وزن سنجی-گرماسنجی افتراقی ترکیبات روی باقی مانده در نمونه بررسی و پایداری حرارتی ساختار MOF-5 تا دمای 470 درجه سانتی‌گراد تأیید شد. 

کلیدواژه‌ها


عنوان مقاله [English]

The Influence of Peroxides and Washing Process on Metal-Organic Framework of MOF-5 Synthesized by Direct Mixing Method

نویسندگان [English]

  • A. Mehdikhani 1
  • H. Fallah-Arani 1
  • F. Dabir 1
  • A. Ghanbari 2
چکیده [English]

 In this research, the effect of hydrogen peroxide (H2O2) and benzoyl peroxide (BPO) on the structural properties, porosity, active pores, and surface area of the MOF-5 (Zn4O(BDC)3) metal-organic framework was studied. For this purpose, the metal-organic framework was synthesized by direct mixing and the molar ratios of the precursors to the ligand were modified to minimize the stoichiometric calculation error as well as the washing process to improve the properties of the synthesized MOF-5. In order to characterize the synthesized compounds and to investigate the effect of peroxides and washing process on the properties of the samples, X-ray diffraction (XRD), fourier Transform infrared spectroscopy (FTIR), and thermogravimetric/Differential scanning calorimetry (TG-DSC) analysis were performed. Structure, pore volume (1.212 cm3/g), and specific surface area (2307 m2/g) were compared to the sample synthesized with H2O2. DM-P-03 was selected as the optimal sample and prepared for thermal stability. According to TG-DSC analysis, the remaining zinc compounds in the sample were checked and the thermal stability of MOF-5 structure was confirmed up to 470°C.

کلیدواژه‌ها [English]

  • Metal-organic framework
  • MOF-5
  • Direct mixing
  • Peroxide
  • Washing process
  • Surface area
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