Facile Synthesis of Poly(triazine imide)–P25 Composites Through Pyrolysis and Hydrothermal Reactions for Photocatalytic Application
摘要
The facile synthesis of crystalline poly(triazine imide) (PTI) using a molten salt bath and subsequent incorporation of P25 (TiO2) nanoparticles to construct (1–x)PTI–xP25 composites through heat treatment and a hydrothermal approach was conducted. Using sodium dodecyl sulfate surfactants improved the dispersion of P25 nanoparticles on the PTI nanosheets. The dispersed P25 nanoparticles then prevented the restacking of the exfoliated PTI nanosheets after the hydrothermal reaction. The synthesized PTI, P25, and their composites were characterized to study their structure–property–application relationships. The synthesized PTI samples are observed to be highly crystalline, large-area nanosheets. Moreover, potassium intercalation is observed for the first time with our samples. Of all the samples tested under Xe lamp radiation, the (1–x)PTI−xP25 (x = 23 at%) composite exhibited the best photodegradation activity against methylene blue and rhodamine B with degradation constants (k) of 1.7 × 10−2 min−1 and 2.3 × 10−2 min−1, respectively. Recovery of the used powders was easily carried out with centrifugation. A maximum applied bias photon-to-current efficiency of approximately 0.6% at 0.8 V (vs. saturated calomel electrode) was also obtained for the x = 23 at% sample. An energy band diagram for the composite was constructed to elucidate its favorable photocatalytic activity.
Graphical Abstract