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

Yıl 2019, , 16 - 24, 16.03.2019

Hafize Nagehan Köysüren

https://doi.org/10.30728/boron.426920

Öz

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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