Abstract: As a photocatalyst, TiO2 has broad application prospects in many fields such as industrial wastewater and environmental pollutant treatment. However, TiO2 powders are prone to aggregation and they primarily exist in aqueous solution with suspended state, and difficult to be completely recovered, thus leading to secondary pollution, which greatly limits its application in practical industrialization. In this work, poly(N-vinyl carbazole)/TiO2 nanocomposites (PVK/TiO2) were synthesized via a in-situ polymerization of N-vinylcarbazole catalyzed by TiO2 nanoparticles under ultraviolet irradiations. A series of techniques including NMR, TEM, XRD, FTIR, UV-vis adsorption spectroscopy, and fluorescence spectroscopy were adopted to characterize the nanocomposites. The results indicate that the TiO2 nanoparticles possess high photocatalytic activities for N-vinylcarbazole monomer and the polymerization can be initiated without the addition of external photoinitiators under ultraviolet irradiations. The TiO2 nanoparticles are uniformly dispersed in the nanocomposites after a washing pretreatment. With the increase of TiO2 content, the fluorescence quenching effect of the nanocomposite is obviously enhanced. It is found for the first time that PVK polymer itself has a significant photodegradation activity for methyl orange under ultraviolet light. The PVK/TiO2 nanocomposites demonstrate superior photocatalytic performance than PVK or TiO2 nanoparticles alone to degrade methyl orange under the same experimental conditions, indicating that the photodegradation property of TiO2 is significantly enhanced by PVK. By taking advantages of excellent heat resistance, corrosion resistance, film forming properties and high mechanical strength of PVK, the PVK/TiO2 nanocomposites can produce a large variety of photodegradation devices in the form of powders, films, fibers and tubes, and therefore have a bright prospect in industrial applications.
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