ارزیابی روش‌های مختلف تثبیت نانوکامپوزیت TiO2-WO3 برروی خاک کیزلگور جهت حذف فتوکاتالیستی علف‌کش کشاورزی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی شیمی، دانشگاه کردستان، سنندج، ایران

10.22078/pr.2025.5464.3433

چکیده

در پژوهش حاضر، مقایسه قابلیت فتوکاتالیست‌های کامپوزیتی TiO2-WO3/Kieselguhr تولید شده به روش‌های مختلف جهت یافتن مؤثر‌ترین روش بارگذاری نانوذرات اتصال ناهمگون برروی پایه کیزلگور در فرآیند حذف فتوکاتالیستی علف‌کش پاراکوات مورد مطالعه و ارزیابی قرار گرفت. بدین منظور، فتوکاتالیست‌های کامپوزیتی اتصال ناهمگون                                                            TiO2-WO3/Kieselguhr به دو روش توزیع حالت جامد و رسوبی سنتز شدند و توسط آنالیزهای XRD، FESEM، EDX، FTIR، UV-Vis و PL مورد شناسایی قرار گرفتند. نتایج آنالیزهای مشخصه‌یابی در کنار تأیید صحت نمونه‌های سنتزی، نشان می‌دهد که حضور ساختار کیزلگور به‌عنوان پایه در کنار اتصال ناهمگون TiO2-WO3، علاوه‌بر حفظ مورفولوژی نیمه‌رساناها، منجر به کاهش تعداد کلوخه‌ها و انباشتگی نانوذرات TiO2 و WO3 می‌گردد که این امر برهم‌کنش بهتر بین پایه و نانوذرات فعال سطحی را موجب می‌گردد. با این حال مقایسه ویژگی‌های نمونه‌های سنتزی به دو روش توزیع حالت جامد و رسوبی بیانگر پراکندگی بهتر نیمه‌رسانا‌های بارگذاری شده برروی پایه، کاهش تعداد کلوخه‌ها در سطح کاتالیست با حداقل میزان مسدود نمودن حفرات کیزلگور و پایین‌تر بودن سرعت بازترکیب جفت‌های الکترون-حفره در نمونه سنتزی به‌روش رسوبی می‌باشد که این امر توسط آنالیزهای XRD، FESEM و PL قابل اثبات است. با بررسی عملکرد فتوکامپوزیت اتصال ناهمگون TiO2-WO3/Kieselguhr سنتز شده به‌روش رسوبی تحت h 2 تابش نور فرابنفش و در شرایط عملیاتی، غلظت آلاینده ppm 5 و مقدار کاتالیست g/L 5/1 میزان حذف فتوکاتالیستی آلاینده پاراکوات به مقدار 84% به‌دست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Different Immobilization Methods of TiO2-WO3 Nanocomposite over Kieselguhr for Photocatalytic Removal of Agricultural Herbicide

نویسندگان [English]

  • Rojiar Akbari Seneh
  • Farhad Rahmani
  • Maryam Moradi
Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
چکیده [English]

In the present study, the comparison of the potential of TiO2-WO3/Kieselguhr composite photocatalysts synthesized by different methods with the aim of finding the most effective immobilization method of TiO2-WO3 heterojunction nanoparticles were studied in the photodegradation of paraquat herbicide. For this purpose, TiO2-WO3 heterostructured photocomposites were synthesized via precipitation and solid-state dispersion (SSD) methods and characterized by XRD, FESEM, EDX, FTIR, PL and UV-Vis techniques. The characterization results alongside the confirmation of synthesis accuracy of samples show that the presence of Kieselguhr as a support of TiO2-WO3 heterojunction not only maintains the morphology and structure of semiconductors but also reduces the aggregation of TiO2 and WO3 nanoparticles, which causes a better interaction between the loaded active nanoparticles and the support. However, based on the XRD, FESEM and PL analyses, a better dispersion of semiconductors loaded on the support, a reduction in the number of surface agglomerates with a minimum Kieselguhr pores blocking, and a decrease in the of electron-hole pairs recombination rate in the precipitation synthesized sample were realized. Ultimately, by examining the performance of TiO2-WO3 heterostructured photocomposites synthesized via precipitation method under 2h UV irradiation and optimal operation conditions (5 ppm pollutant concentration and 1.5 g/L photocatalyst dosage), 84% of paraquat photocatalytic removal was obtained.

کلیدواژه‌ها [English]

  • Kieselguhr
  • TiO2-WO3 heterojunction
  • Precipitation method
  • Photodegradation
  • Paraquat herbicide

مراجع

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پژوهش نفت
دوره 35، 1404-2 - شماره پیاپی 141
خرداد و تیر 1404
صفحه 87-98

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