Abstract
Partially conjugated polyvinyl chloride (CPVC)-modified TiO2 nanoparticles were synthesized by heating the composite of polyvinyl chloride and TiO2 nanoparticles in air at 150°C for 1h (the optimal heating duration among the investigated 0.5h, 1h, 2h, 3h and 4h to obtain the most efficient CPVC/TiO2 composite). The characterization results from X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy and high resolution transmission electron microscopy confirmed the formation of TiO2 nanoparticles modified with CPVC. The UV–vis diffuse reflectance spectra indicated that the as-synthesized CPVC-modified TiO2 nanoparticles had remarkable visible-light-absorbing ability. The photocatalytic experiments demonstrated that the as-synthesized CPVC-modified TiO2 nanoparticles exhibited high photocatalytic activity in the reduction of aqueous Cr(VI) under visible-light (λ>420nm) irradiation, whereas sole CPVC and TiO2 nanoparticles exhibited no photocatalytic activity in the reduction of aqueous Cr(VI) under visible-light (λ>420nm) irradiation.
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