Photocatalytic activity of polyvinyl borate/titanium dioxide composites for UV light degradation of organic pollutants

2018

Catalysts

In this study, polymer composites based on polyvinyl borate (PVB) with titanium dioxide (TiO2) nanoparticles were prepared through the condensation reaction of polyvinyl alcohol and boric acid in the presence of TiO2 nanoparticles. The solid-phase photocatalytic degradation of the polymer composites under UV light irradiation was investigated and compared with that of the pure PVB with the aid of weight loss measurements. The introduction of the photocatalyst nanoparticles in PVB enhanced the solid-phase photocatalytic degradation of the polymer matrix under UV light irradiation. The structural and morphological properties of PVB/TiO2 composites were analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and UV-Vis spectroscopy, respectively. FTIR analysis revealed that PVB synthesis was successfully carried out in the presence of the photocatalyst nanoparticles. According to the morphological analyses, TiO2 nanoparticles were well dispersed in the PVB matrix.

Section: Introductionsupporting

confidence: 70%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solid-Phase Photocatalytic Degradation of Polyvinyl Borate

2018

Catalysts

“…PVB ve PVB/TiO 2 nanokompozitler, polivinil alkol ve borik asit'in çapraz bağlanma reaksiyonu ile sentezlenmiştir [28,29,31]. PVB/TiO 2 nanokomopozitlerin sentezinde, PVB sentezinden farklı olarak çözelti ortamına TiO 2 nanoparçacıklar eklenmiştir.…”

Section: Malzemeler Ve Yöntemler (Materials and Methods)unclassified

Polivinil borat/TiO2 Nanokompozitlerin Fotokataliz Uygulaması

2019

Journal of Boron

ÖZETPolivinil borat (PVB)/titanyum dioksit (TiO 2 ) nanokompozitler, polivinil alkol ve borik asit'in TiO 2 nanoparçacık varlığında çapraz bağlanma reaksiyonu ile sentezlenmiştir. Ağırlıkça %0, 10, 20 ve 30 oranında TiO 2 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. TiO 2 katkısı ile PVB'nin fotokatalitik etkinliği artmıştır. En yüksek fotokatalitik etkinlik, ağırlıkça %30 oranında TiO 2 içeren nanokompozit ile elde edilmiştir. FTIR analizi ile nanokompozitin kimyasal yapısı incelenmiştir. FTIR analizi ile, PVB ve TiO 2 içeren PVB nanokompozitlerin başarılı bir şekilde sentezlendiği gösterilmiştir. SEM ve TEM analizleri ile nanokompozitlerin morfolojisi detaylı bir şekilde incelenmiştir. TiO 2 nanoparçacıklarından oluşan 100 nm civarında kümeler TEM görüntülerinde gözlenmiştir. ABSTRACTPolyvinyl borate (PVB)/titanium dioxide nanocomposites were synthesized through the crosslinking reaction of polyvinyl alcohol and boric acid in the presence of TiO 2 nanoparticles. Nanocomposites containing 0, 10, 20 and 30 wt.% TiO 2 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 TiO 2 contribution. The highest photocatalytic activity was obtained with the nanocomposite containing 30 wt.% TiO 2 . The chemical structure of the nanocomposite was investigated by FTIR analysis. FTIR analysis reveals that PVB and TiO 2containing PVB nanocomposites were successfully synthesized. Morphology of the nanocomposites was studied in detail by SEM and TEM analyses. TiO 2 aggregates of about 100 nm were observed on TEM images.

Improving ultraviolet light photocatalytic activity of polyaniline/silicon carbide composites by Fe‐doping

J of Applied Polymer Sci

2019

It was aimed to prepare polyaniline (Pani) composites, including silicon carbide (SiC) nanofibers doped with iron (Fe) ions. The Fe‐doping of SiC was performed to enhance the photocatalytic activity of the composites through the separation of photoexcited mobile charge carriers. For comparison purposes, Pani composites were also prepared with undoped SiC nanofibers. The composite samples were characterized by FTIR, XRD, SEM, EDX, and UV–Vis spectroscopies. Experiments on photocatalytic degradation of methylene blue under ultraviolet light irradiation revealed that Pani/SiC‐Fe composites exhibited higher photocatalytic activity when compared with Pani/SiC composites. Almost 22% dye removal was obtained within 300 min with the Pani composite, containing 15 wt.% SiC‐Fe. FTIR, XRD, SEM, EDX, and UV–Vis spectroscopies demonstrated that SiC nanofibers were successfully doped with iron ions and incorporated into the polyaniline matrix. The original aspect of this study was to research the photocatalytic activity of polyaniline composites containing Fe‐doped SiC nanofibers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48524.