Polivinil borat/TiO2 nanokompozitlerin UVA ve doğal güneş işığı altındaki fotokataliz uygulaması

Abstract

Polivinil borat (PVB)/titanyum dioksit (TiO₂) nanokompozitler, polivinil alkol ve borik asit’in TiO₂ nanoparçacık varlığında çapraz bağlanma reaksiyonu ile sentezlenmiştir. Ağırlıkça %0, 10, 20 ve 30 oranında TiO₂ nanoparçacık içeren nanokompozitler elde edilmiştir ve hazırlanan nanokompozitlerin fotokatalitik etkinliği metilen mavisinin sudaki çözeltisinin UVA ışığı ve doğal güneş ışığı altındaki bozunumu ile ayrı ayrı çalışılmıştır. TiO₂ katkısı ile PVB’nin fotokatalitik etkinliği artmıştır. En yüksek fotokatalitik etkinlik, ağırlıkça %30 oranında TiO₂ içeren nanokompozit ile elde edilmiştir. FTIR analizi ile nanokompozitin kimyasal yapısı incelenmiştir. FTIR analizi ile, PVB ve TiO₂ içeren PVB nanokompozitlerin başarılı bir şekilde sentezlendiği gösterilmiştir. SEM ve TEM analizleri ile nanokompozitlerin morfolojisi detaylı bir şekilde incelenmiştir. TiO₂ nanoparçacıklarından oluşan 100 nm civarında kümeler TEM görüntülerinde gözlenmiştir.

Photocatalysis application of polyvinyl borate/TiO2 nanocomposites under UVA and natural sun lights

Abstract

Polyvinyl borate (PVB)/titanium dioxide nanocomposites were synthesized through the crosslinking reaction of polyvinyl alcohol and boric acid in the presence of TiO₂ nanoparticles. Nanocomposites containing 0, 10, 20 and 30 wt.% TiO₂ nanoparticles were obtained and the photocatalytic activity of the prepared nanocomposites was studied by the degradation of methylene blue in aqueous solution under UVA light and natural sun light, seperately. The photocatalytic activity of PVB increased with TiO₂ contribution. The highest photocatalytic activity was obtained with the nanocomposite containing 30 wt.% TiO₂. The chemical structure of the nanocomposite was investigated by FTIR analysis. FTIR analysis reveals that PVB and TiO₂-containing PVB nanocomposites were successfully synthesized. Morphology of the nanocomposites was studied in detail by SEM and TEM analyses. TiO₂ aggregates of about 100 nm were observed on TEM images.

Keywords

• Photocatalytic activity,; Polyvinyl borate,Titanium dioxide,UVA irradiation,Natural sun light

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