اثر جانشانی روی به‌جای منگنز بر ویژگی‌های ریزساختاری، نوری و فوتوکاتالیزوری نانوذرات LaMnO3

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه دامغان

چکیده

ویژگی­های ریزساختاری، نوری و فوتوکاتالیزوری نانو­ذرات  LaMn1-xZnxO3 (15/0 ،1/0 ،05/0،0x =) با پراش­سنج پرتو ایکس، طیف­سنج­های رامان و تبدیل فوریه فروسرخ، میکروسکوپ الکترونی روبشی گسیل میدانی، طیف‌سنج پراکندگی انرژی پرتو X، و طیف­سنج فرابنفش بررسی شد. نتایج ساختاری نشانگر یک گذار فاز ساختاری از لوزی رخ (گروه فضایی  ) به راست‌گوشه (گروه فضایی Pbnm I) است. منگنایت لانتانیم (LM) از امیدوار کننده­ترین و کارآمدترین فوتوکاتالیزورها برای تخریب آلاینده‌های آلی است. برای تعیین عملکرد فوتوکاتالیزوری نانوذرات LaMn1-xZnxO3، اثر سه عامل مقدار کاتالیزور، pH محلول و زمان تابش بر تخریب محلول آبی متیل اورانژ (MO) و متیل بلو (MB) بررسی شد. 3O1/0Zn9/0MnLa برای تخریب MO و MB زیر تابش نور خورشید توانایی فوتوکاتالیزوری بالاتری را نسبت به LM نشان داد. سازوکار احتمالی برای عملکرد فوتوکاتالیزوری بهتر نمونه‌ها مورد بحث قرار گرفت. نمونه 3O1/0Zn9/0MnLa پس از شش چرخه تخریب MO و MB در شرایط یکسان، هیچ اتلاف قابل توجهی را نشان نداد.       

کلیدواژه‌ها

عنوان مقاله [English]

Effect of zinc substitution for manganese on microstructural, optical and photocatalytic properties of LaMnO3 nanoparticles

نویسندگان [English]

  • Maryam Naghavi
  • Ahmad Gholizadeh
Damghan University
چکیده [English]

Microstructural, optical, and photocatalytic properties of (x = 0, 0.05, 0.10, 0.15) LaMn1-xZnxO3 nanoparticles have been investigated by X-ray diffraction, Raman and Fourier transform infrared spectroscopy, field emission scanning electron microscope, Energy-dispersive X-ray spectroscopy, and UV-Vis spectroscopy. Our study indicates that there is a structural phase transition from the rhombohedral (space group R3c) to the orthorhombic (space group Pbnm I) structure. Lanthanum manganese (LM) is one of the most promising and efficient photocatalysts for the degradation of organic pollutants. To determine the photocatalytic performance of LaMn1-xZnxO3 nanoparticles, the effects of three operational parameters including irradiation time, pH, and the catalyst amount on the degradation of aqueous solution of methyl orange (MO) and methyl blue (MB) were investigated. The results showed that LaMn0.9Zn0.1O3 has higher photocatalytic activity than the LM for degradation of MO and MB under sunlight. A possible mechanism for better photocatalytic performance of the samples was discussed. The LaMn0.9Zn0.1O3 did not exhibit any significant loss after six cycles of the degradation of MO and MB under the same conditions.

کلیدواژه‌ها [English]

  • Lanthanum manganite
  • Microstructural properties
  • Optical properties
  • Structural phase transition
  • Photocatalytic degradation

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مجله بلورشناسی و کانی شناسی ایران
دوره 31، شماره 1 - شماره پیاپی 89
فروردین 1402
صفحه 195-206

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  • تاریخ دریافت: 21 تیر 1401
  • تاریخ بازنگری: 27 شهریور 1401
  • تاریخ پذیرش: 30 مهر 1401

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