نوع مقاله : مقاله پژوهشی
نویسندگان
1 عضو هیات علمی دانشگاه کردستان
2 عضو هیات علمی گروه م. شیمی دانشگاه کردستان
3 دانشگاه کردستان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In the present study, the effect of TiO2-WO3 heterojunction formation over Kieselguhr support and comparison of the potential of 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, PL and UV-vis techniques. The characterization results along with 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 surface-active nanoparticles and the support. However, the comparison of the characteristics of the synthesized samples using solid state distribution and precipitation methods shows 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, which can be proved by XRD, FESEM and PL analyses. By examining the performance of TiO2-WO3 heterostructured photocomposites synthesized via precipitation method under 2h ultraviolet light irradiation and optimal 5 ppm pollutant concentration and 0.5 g/L amount of photocatalyst, 84% of paraquat photocatalytic removal was obtained.
کلیدواژهها [English]
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