Low temperature synthesis of polyaniline-crystalline TiO2-halloysite composite nanotubes with enhanced visible light photocatalytic activity.

摘要: A series of one-dimensional polyaniline–crystalline TiO2–halloysite composite nanotubes with different mass ratio polyaniline to TiO2 are facilely prepared by employing the low-temperature synthesis crystalline on halloysite nanotubes. The can adsorb TiO2/polyaniline precursors and induce nanocrystals/polyaniline grow support in situ simultaneously. By simply adjusting acidity reaction system, PANI-crystalline TiO2–HA composed anatase, a mixed phase PANI redox state obtained. XRD UV–vis results show that surface sensitization has no effect structure light response is extended visible-light regions. Photocatalysis test reveal photocatalytic activity will be affected pH value volume ANI TTIP. highest achieved photocatalysts at 0.5 1% TTIP owing sensitizing charge transfer from photoexcited sensitizer TiO2. Moreover, PANI–TiO2–HA synthesized one-step exhibit higher visible than those two-step. Heterogeneous degradation 1.5. redoped experiment proves plays main contribution enhanced catalytic efficiency 0.5. Furthermore, heterogeneous have good stability reused four times only gradual loss under irradiation.