Arak University Colloid & Nanoscience Journal 2980-9215 2 1 2024 07 01 Promoting visible-light degradation of toluene over a simple constructed TiO2/Pd nanocomposite as photocatalytic coating air purification filter 228 237 715390 10.61186/CNJ.2.1.228 EN Saber Badkoobeh Hezaveh Department of Mechanical Engineering, Sharif University of Technology, 1458889694, Tehran, Iran 0009-0006-2975-7201 Mohammad Taha Ranjbar School of Chemical Engineering, Faculty of Engineering, University of Tehran, 1439955961, Tehran, Iran Bardia Nabavi Department of Mechanical Engineering, Sharif University of Technology, 1458889694, Tehran, Iran Journal Article 2024 08 21 A series of air filters based on the TiO₂/Pd nanophotocatalyst were prepared using the colloid solution method in the presence of polyvinyl alcohol (PVA) as a surfactant. The morphology, surface area, and visible light adsorption properties, were investigated using FESEM, BET, and DRS analysis. As a result, the nitrogen adsorption-desorption isotherms of the catalysts showed that the N₂ adsorption ability of the resulted nanophotocatalysts (1.5 Wt.% of PVA) was better than the TiO₂ and other catalyst samples with more surface area. The photocatalytic activity of the nanophotcatalyst filter was investigated in the experiments of the photocatalytic degradation of toluene in a gaseous phase under visible light illumination. Among all the filters, the 10 Wt.% nanophotcaotalyst filter demonstrated the highest photocatalytic ability to decompose toluene. The photocatalytic efficiency of the nanophotocatalyst with the 1.5 Wt.% of PVA was remarkably enhanced by toluene removal. The LED lamp-60 W achieved the highest photocatalytic activity. The enhanced photodegradation of toluene is possibly due to the improved adsorption ability and the enhanced electron-hole pairs separation due to the presence of Pd nanoparticles on the surface of TiO₂ nanocatalyst and the electron transfer between the conduction band/defect level and Pd nanoparticles. https://cnj.araku.ac.ir/article_715390_6be6200346ee7bbfeb444f0258f88562.pdf