A simple method for preparing nanoscale copper ferrite particles with narrow distribution and uniform size was developed by auto-combusting the precursor using copper nitrate, iron nitrate, and malic acid as raw materials. The constituents and the thermal decomposition process of the precursor were studied by Fourier transform infrared (FT-IR), thermogravimetry-differental thermal analysis (TG-DTA) and X-ray diffraction (XRD). The results showed that the carboxyl and nitrate ion take part in the reaction during the auto-combustion process. The precursor decomposed completely at about 199 °C, to yield single phase product. Transmission electron microscopy (TEM) indicated that the average size of the as-burnt sample was about 90 nm.
The B-F codoped nano-TiO 2 powders were prepared by the sol-gel method. The surface of powders was modified by stearic acid. The visible light photodegradable PVC/B-F codoped nano-TiO 2 composite films were prepared by tape casting processing. Solid-phase visible light photocatalytic degradation of the films were investigated with a 1000W xenon lamp and a ZJB 420 filter glass was used to cut off light of wavelength <420 nm. The weight-loss measurement, SEM, DSC of films were detected. Results showed that the weight loss of PVC/B-F codoped nano-TiO 2 composite film (2%TiO 2 w/w) is 16.9% after 120h UV irradiation, which is notably higher than that of both the pure PVC film and the PVC/nano-TiO 2 composite film. Glass transition (Tg) is appeared for samples after 72h irradiation, and the Tg of PVC/B-F codoped nano-TiO 2 composite film is the lowest of all samples. The surface of PVC/B-F codoped nano-TiO 2 composite film was destroyed obviously by SEM photo.
Poly (phenylene sulfide) (PPS)/nano-TiO 2 composites were prepared by DAKA miniature blending instrument. Isothermal crystallization behavior of PPS composites at 245°C, 250°C, 255°C and 260°C were investigated by means of DSC. The crystallization time of PPS composites is shorter than which of neat PPS at the same crystallization temperature. The Avrami equation was used to analyze DSC data. Results showed that neat PPS is homogeneous nucleation at lower crystallization temperature, which is heterogeneous nucleation at higher crystallization temperature contrarily. PPS/nano-TiO 2 composites are heterogeneous nucleation at various crystallization temperature, nano-TiO 2 particles play a role of nucleating agent.
Lanthanum doped TiO 2 powders were prepared by hydrolysis of titanium tetra-n-butyl oxide and La (NO 3 ) 3 in solution. The resulting powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectroscopy. The photocatalytic activities of doped samples were evaluated by the decomposition of methylene blue under visible light irradiation. The XRD results showed that the doping of lanthanum could not only efficiently inhibit the grain growth but also suppress the phase transition of anatase to rutile. UV-Vis spectroscopy of lanthanum doping TiO 2 indicated that the absorption onset red-shifted to the visible light region. XPS results revealed that La 2 O 3 had formed which could enhance the surface area. The degradation rates of methylene blue verified that the visible light photocatalytic activity of TiO 2 has been enhanced by the doping of lanthanum.
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