سنتز و شناسایی نانو پروسکایت LaCoO3 وکاربرد آن به عنوان جاذب در حذف قارچ کش بردوفیکس در محلول آبی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینایمان خسروی 1 , ملیکا افتخار 2 , نسیم قادریان 3
1 - گروه شیمی، واحد قشم، دانشگاه آزاد اسلامی ، قشم، ایران
2 - گروه شیمی، دانشگاه آزاد اسلامی واحد قشم
3 - گروه شیمی ، واحد قشم ، دانشگاه آزاد اسلامی ، قشم، ایران
کلید واژه: نانو پروسکایت, سل ژل, قارچ کش بردوفیکس, پراش اشعه X ,
چکیده مقاله :
در این پژوهش نانو ذرات پروسکایت (LaCoO3) با استفاده از روش سل-ژل سنتز گردید. وزن سنجی حرارتی (TGA) مشخص نمود که دمای کلسینه در حدود 800 درجه سانتی گراد می‌باشد. نتایج طیف سنجی مادون قرمز (FTIR) و پراش اشعه ایکس (XRD) X تشکیل تک فاز پروسکایتی را تأیید کرد. همچنین مورفولوژی سطح نانو پروسکایت توسط میکروسکوپ الکترونی روبشی (SEM)، میکروسکوپ الکترونی عبوری (TEM) مورد بررسی قرار گرفت و سایز ذرات بدست آمده با این روش با نتایج پراش اشعه X هم خوانی داشت. سپس توانایی نانوپروسکایت LaCoO3 برای حذف آفت کش بردوفیکس مورد بررسی قرار گرفت. تأثیر پارامترهای مختلف مانند غلظت اولیه آلاینده، مقدار نانو پروسکایت، دما و PH روی حذف آلاینده مورد نظر بررسی شد و مشخص گردید که بیشترین جذب آفت کش در11 PH= و دمای 45درجه سانتیگراد بود. بررسی عوامل مؤثر بر سرعت واکنش نشان داد که فرآیند جذب سطحی از سینتیک درجه دوم پیروی کرد. دو مدل ایزوترم های جذبی لانگ مویر و فرندلیچ، مورد بررسی قرار گرفت و نتایج نشان داد که ایزوترم جذب از مدل فرندلیچ پیروی کرد. همچنین حذف فتوکاتالیزوری قارچ کش بردوفیکس در 7=PH و تابش اشعه UV آزمایش گردید و مشخص شد نانو پروسکایت سنتز شده خاصیت فتوکاتالیزوری ندارد
In this study, perovskite nanoparticles (LaCoO3) were synthesized using a sol-gel method. Thermogravimetric analysis (TGA) indicated that the calcination temperature was around 800°C. Fourier transform infrared (FTIR) and X-ray diffraction (XRD) results confirmed the formation of a single perovskite phase. Also, the surface morphology of nano-perovskite was examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the particle size obtained by this method was consistent with the X-ray diffraction results. Then, the ability of nano-perovskite LaCoO3 to remove the Bordeaux fix fungicide was investigated. The effect of various parameters such as initial contaminant concentration, amount of nano perovskite, temperature and pH on the removal of the desired contaminant was investigated and it was found that the highest pesticide adsorption was at pH=11 and temperature of 45°C. The investigation of factors affecting the reaction rate showed that the adsorption process followed second-order kinetics. Two models of adsorption isotherms, Langmuir and Freundlich, were investigated and the results showed that the adsorption isotherm followed the Freundlich model. Also, the photocatalytic removal of the Bordeaux fix fungicide was tested at pH=7 and UV irradiation and it were found that the synthesized nano perovskite does not have photocatalytic properties.
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