کارایی نانوذرات فوتوکاتالیست تثبیت شده بر روی میکروگلوله‌های شیشه‌ای در حذف سیانید با نور خورشید

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهرکرد، شهرکرد

2 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهرکرد، شهرکرد

3 استاد، دانشکده شیمی، دانشگاه کاشان، کاشان

4 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی شهرکرد، شهرکرد

5 استادیار گروه آمار زیستی، دانشکده بهداشت، دانشگاه علوم پزشکی شهرکرد، شهرکرد

چکیده

در این مقاله، تخریب نوری سیانید با استفاده از فوتوکاتالیست S, N-TiO2  سنتزی به‌وسیله روش سل- ژل تثبیت شده بر روی میکروگلوله‌های شیشه‌ای مورد بررسی قرار گرفت. تیواوره به‌عنوان منبع نیتروژن و گوگرد و تترابوتیل اورتوتیتانات از ترکیبات اصلی سنتز فوتوکاتالیست بودند. اثر مقدار تیواوره، نور مرئی (لامپ 400 وات) و خورشید، زمان تابش و مقدار متفاوت اولیه سیانید (50، 100، 200 و ppm 300) روی تخریب نوری سیانید مطالعه شد. به‌منظور اندازه‌گیری غلظت سیانید از روش تیتراسیون استفاده شد. خصوصیات فیلم فوتوکاتالیست سنتزی به‌وسیله پراش پرتوی ایکس، اسپکتروسکوپی مرئی- فرابنفش انعکاسی، میکروسکوپ الکترونی روبشی و طیف‌سنجی پراش انرژی پرتو ایکس تعیین شد. الگوی XRD و تصاویر SEM، اندازه نانومتری فوتوکاتالیست سنتزی را تأیید کردند. آنالیز EDX و DRS نیز به‌ترتیب حضور S و N و فعالیت نوری فوتوکاتالیست در ناحیه مرئی را نشان دادند. سیانید با غلظت ppm50، در حضور فیلم S, N-TiO2 با 25 گرم تیواوره، بالای 94 درصد در نور مرئی و در حدود 100 درصد در نور خورشید، در مدت زمان 4 ساعت تخریب شد. فوتوکاتالیست S, N-TiO2 تثبیت شده بر روی میکروگلوله‌های شیشه‌ای می‌توانند به‌صورت مؤثری به‌عنوان یک روش جدید برای تصفیه پساب صنایع حاوی سیانید، تحت نور خورشید به‌کار رود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Cyanide Removal Efficiency of Photocatalytic Nanoparticles Stabilized on Glass Microbeads Under Sun Irradiation

نویسندگان [English]

  • Neda Masoudipour 1
  • Mehraban Sadeghi 2
  • Mohsen Behpour 3
  • Fazel Mohammadi-Moghadam 4
  • Morteza Sedehi 5
1 Former Graduate Student of Environmental Health Engineering, Faculty of Public Health, Shahrekord University of Medical Sciences, Shahrekord
2 Assoc. Prof., Department of Environmental Health Engineering, Faculty of Public Health, Shahrekord University of Medical Sciences, Shahrekord
3 Prof., Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
4 Ass. Prof., Department of Environmental Health Engineering, Faculty of Public Health, Shahrekord University of Medical Sciences, Shahrekord, Iran
5 Ass. Prof. of Biostatistics, Faculty of Public Health, Shahrekord University of Medical Sciences, Shahrekord, Iran
چکیده [English]

This paper investigates cyanide photodestruction (at pH 9) using the S, N-TiO2 photocatalyst synthesized by the sol-gel method and stabilized on glass microbeads. The main raw materials were thiourea, as a source of N and S, and tetra butyl ortho titanate. The effects of S and N doses, visible light (a 400W light), sunlight, irradiation time, and different initial cyanide concentrations (50, 100, 200, and 300 ppm) were studied on cyanide photodestruction. Cyanide concentration was measured by the titration method and the photocatalyst film was characterized by X-ray diffraction (XRD), UV-Vis diffuse reflection spectroscopy (DRS), Scanning Electron Microscopy (SEM), and Energy dispersive X-ray (EDX) analysis. XRD patterns and SEM images were used to determine the nanoparticle size of the photocatalyst on glass microbeads. EDX and DRS analyses confirmed the presence of S and N as well as the activity of the photocatalyst in the visible region, respectively. The S, N-TiO2 film with 0.25 g Thiuourea proved to be the best cyanide photodestruction agent in the visible light. Based on the results obtained, S, N-TiO2/ glass microbead was capable of destroying cyanide (50 ppm) by up to 94% in the visible light and by approximately 100% in the sunlight. The results also indicated that S, N-Tio2/scoria stone was capable of destroying cyanide by 85% in the visible light and by 94% in the sunlight within 4 h.  The reaction kinetic for all cyanide concentrations and two photocatalyst substrates were described by a first order equation. Finally, it was concluded that the S, N-TiO2 stabilized on glass microbeads could be effectively used as a new method for treating wastewater containing free cyanide under the sunlight.

کلیدواژه‌ها [English]

  • photocatalyst
  • Cyanide photodestruction
  • Nonmetal-doping TiO2
  • Sunlight irradiation

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