دوره 31، شماره 1 - ( 1-1402 )
جلد 31 شماره 1 صفحات 206-195 |
برگشت به فهرست نسخه ها
مریم نقوی1 
، احمد قلی زاده* 1
، احمد قلی زاده* 1
1- دانشگاه دامغان
چکیده: (565 مشاهده)
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.
واژه‌های کلیدی: منگنایت لانتالیم، ویژگیهای ریزساختاری، ویژگیهای نوری، گذار فاز ساختاری، تخریب فوتوکاتالیزوری.
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